Add NoUpscale option

Fix typo, convertor -> converter

.github/workflows/test.yml

@@ -0,0 +1,23 @@
+on: [push, pull_request]
+name: Test
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        go-version: [1.23.x]
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    env:
+      CGO_ENABLED: 0
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+    - name: Install Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: ${{ matrix.go-version }}
+    - name: Test
+      run: go test
+      env:
+        CGO_ENABLED: 1

.gitignore

@@ -0,0 +1,5 @@
+cmd/cbconvert-gui/cbconvert-gui
+cmd/cbconvert/cbconvert
+
+.idea
+.vscode

README.md

@@ -1,108 +1,231 @@
-CBconvert
-=========
+## CBconvert
 
-Introduction
-------------
+### Introduction
 
-CBconvert is a [Comic Book](http://en.wikipedia.org/wiki/Comic_Book_Archive_file) convert tool.
+CBconvert is a [Comic Book](http://en.wikipedia.org/wiki/Comic_Book_Archive_file) converter.
 
-Features
---------
+It can convert comics to different formats to fit your various devices.
 
- - reads RAR, ZIP, 7Z, GZ, BZ2, CBR, CBZ, CB7, CBT, PDF, EPUB, XPS and plain directory
- - always saves processed comic in CBZ (ZIP) format
- - images can be converted to JPEG, PNG or 4-Bit BMP (16 colors) format
- - choose resize algorithm (NearestNeighbor, Bilinear, Bicubic, MitchellNetravali, Lanczos2/3)
- - export covers from comics
- - create thumbnails from covers by [freedesktop](http://www.freedesktop.org/wiki/) specification
+<img src="cmd/cbconvert-gui/screenshots/linux-01.jpg" width="700" alt="screenshot" />
 
-Download
---------
+See more [screenshots](https://github.com/gen2brain/cbconvert/blob/master/cmd/cbconvert-gui/screenshots/).
 
- - [Windows static build](https://github.com/gen2brain/cbconvert/releases/download/0.2.0/cbconvert-0.2.0.zip)
- - [Linux 64bit build](https://github.com/gen2brain/cbconvert/releases/download/0.2.0/cbconvert-0.2.0.tar.gz)
+### Features
 
-Using
------
+* reads CBR (RAR), CBZ (ZIP), CB7 (7Z), CBT (TAR), PDF, XPS, EPUB, MOBI, DOCX, PPTX and plain directory
+* saves processed files in ZIP archive format or TAR
+* images can be converted to JPEG, PNG, TIFF, WEBP, AVIF, JXL, or 4-Bit BMP (16 colors) image format
+* rotate, adjust brightness/contrast or grayscale images
+* resize filters (NearestNeighbor, Box, Linear, MitchellNetravali, CatmullRom, Gaussian, Lanczos)
+* export covers from comics
+* create thumbnails from covers by [FreeDesktop](http://specifications.freedesktop.org/thumbnail-spec/thumbnail-spec-latest.html) specification
 
-    usage: cbconvert [<flags>] <args>...
+### Download
 
-    Comic Book convert tool.
+Download the latest binaries from the [releases](https://github.com/gen2brain/cbconvert/releases).
 
-    Flags:
-          --help             Show context-sensitive help (also try --help-long and --help-man).
-          --version          Show application version.
-      -p, --png              encode images to PNG instead of JPEG
-      -b, --bmp              encode images to 4-Bit BMP instead of JPEG
-      -w, --width=0          image width
-      -h, --height=0         image height
-      -q, --quality=75       JPEG image quality
-      -n, --norgb            do not convert images with RGB colorspace
-      -i, --interpolation=1  0=NearestNeighbor, 1=Bilinear, 2=Bicubic, 3=MitchellNetravali, 4=Lanczos2, 5=Lanczos3
-      -s, --suffix=SUFFIX    add suffix to file basename
-      -c, --cover            extract cover
-      -t, --thumbnail        extract cover thumbnail (freedesktop spec.)
-      -o, --outdir="."       output directory
-      -m, --size=0           process only files larger then size (in MB)
-      -r, --recursive        process subdirectories recursively
-      -Q, --quiet            hide console output
+Linux Flatpak is available at [Flathub](https://flathub.org/apps/io.github.gen2brain.cbconvert).
 
-    Args:
-      <args>  filename or directory
+### Compile
+
+You must have `CGO_ENABLED=1`. Note that `Go` will disable cgo when cross-compiling.
+
+Install to `GOBIN` (you can point `GOBIN` to e.g. `/usr/local/bin` or `~/.local/bin`):
+
+`go install github.com/gen2brain/cbconvert/cmd/cbconvert@latest`
+
+For GUI app, check [IUP](https://github.com/gen2brain/iup-go) requirements, and then install:
+
+`go install github.com/gen2brain/cbconvert/cmd/cbconvert-gui@latest`
+
+### Build tags
+
+* `extlib` - use external `libmupdf` and `libunarr` libraries
+* `pkgconfig` - enable pkg-config (used with `extlib`)
+
+### Using cbconvert in file managers to generate FreeDesktop thumbnails
+
+Copy/install `cbconvert` cli binary to your `PATH`, create file `~/.local/share/thumbnailers/cbconvert.thumbnailer`
+and paste contents from [thumbnailer](https://github.com/gen2brain/cbconvert/tree/master/cmd/cbconvert-gui/dist/linux/io.github.gen2brain.cbconvert.thumbnailer).
+
+This is what it looks like in the `PCManFM` file manager:
+
+<img src="cmd/cbconvert-gui/screenshots/thumbnails.jpg" width="700" alt="thumbnails" />
 
 
-Examples
---------
+### Using command line app
 
-Rescale images to 1200px for all supported files found in directory with size larger then 60MB:
+```
+Usage: cbconvert <command> [<flags>] [file1 dir1 ... fileOrDirN]
 
-    cbconvert --recursive --width 1200 --size 60 /media/comics/Thorgal/
 
-Convert all images in archive to 4bit BMP image and save result in ~/comics directory:
+Commands:
 
-    cbconvert --bmp --outdir ~/comics /media/comics/Garfield/Garfield_01.cbz
+  convert
+    	Convert archive or document
 
-[BMP](http://en.wikipedia.org/wiki/BMP_file_format) format is uncompressed, for black&white pages very good choice. Archive size can be smaller 2-3x and file will be readable by comic readers.
+    --width
+    	Image width (default "0")
+    --height
+    	Image height (default "0")
+    --fit
+    	Best fit for required width and height (default "false")
+    --no-upscale
+    	Do not upscale images already smaller than the requested width/height (default "false")
+    --dpi
+    	Document rendering resolution in DPI (PDF, EPUB, etc.), 0 uses the default (300) (default "0")
+    --format
+    	Image format, valid values are jpeg, png, tiff, bmp, webp, avif, jxl (default "jpeg")
+    --archive
+    	Archive format, valid values are zip, tar (default "zip")
+    --zip-level
+    	ZIP compression level, 0 disables compression, 1-9 sets deflate level (1 fastest, 9 smallest), -1 uses the default (default "-1")
+    --quality
+    	Image quality (default "75")
+    --effort
+    	Encoder speed/effort, format-specific (webp method 0-6, avif speed 0-10, jxl effort 1-10), -1 uses the format default (default "-1")
+    --lossless
+    	Lossless compression (webp, avif, jxl), ignores quality (default "false")
+    --combine
+    	Combine all inputs into a single archive (default "false")
+    --outfile
+    	Output file name for --combine (default: first input + -combined) (default "")
+    --filter
+    	0=NearestNeighbor, 1=Box, 2=Linear, 3=MitchellNetravali, 4=CatmullRom, 6=Gaussian, 7=Lanczos (default "2")
+    --no-cover
+    	Do not convert the cover image (default "false")
+    --no-rgb
+    	Do not convert images that have RGB colorspace (default "false")
+    --no-nonimage
+    	Remove non-image files from the archive (default "false")
+    --no-convert
+    	Do not transform or convert images (default "false")
+    --grayscale
+    	Convert images to grayscale (monochromatic) (default "false")
+    --rotate
+    	Rotate images, valid values are 0, 90, 180, 270 (default "0")
+    --brightness
+    	Adjust the brightness of the images, must be in the range (-100, 100) (default "0")
+    --contrast
+    	Adjust the contrast of the images, must be in the range (-100, 100) (default "0")
+    --suffix
+    	Add suffix to file basename (default "")
+    --outdir
+    	Output directory (default ".")
+    --size
+    	Process only files larger than size (in MB) (default "0")
+    --recursive
+    	Process subdirectories recursively (default "false")
+    --quiet
+    	Hide console output (default "false")
 
-Generate thumbnails by freedesktop specification in ~/.thumbnails/normal directory, Lanczos3 algorithm is used for resizing:
+  cover
+    	Extract cover
 
-    cbconvert --interpolation=5 --outdir ~/.thumbnails/normal --thumbnail /media/comics/GrooTheWanderer/
+    --width
+    	Image width (default "0")
+    --height
+    	Image height (default "0")
+    --fit
+    	Best fit for required width and height (default "false")
+    --no-upscale
+    	Do not upscale images already smaller than the requested width/height (default "false")
+    --dpi
+    	Document rendering resolution in DPI (PDF, EPUB, etc.), 0 uses the default (300) (default "0")
+    --format
+    	Image format, valid values are jpeg, png, tiff, bmp, webp, avif (default "jpeg")
+    --quality
+    	Image quality (default "75")
+    --effort
+    	Encoder speed/effort, format-specific (webp method 0-6, avif speed 0-10, jxl effort 1-10), -1 uses the format default (default "-1")
+    --lossless
+    	Lossless compression (webp, avif, jxl), ignores quality (default "false")
+    --filter
+    	0=NearestNeighbor, 1=Box, 2=Linear, 3=MitchellNetravali, 4=CatmullRom, 6=Gaussian, 7=Lanczos (default "2")
+    --outdir
+    	Output directory (default ".")
+    --size
+    	Process only files larger than size (in MB) (default "0")
+    --recursive
+    	Process subdirectories recursively (default "false")
+    --quiet
+    	Hide console output (default "false")
 
-Compile
--------
+  thumbnail
+    	Extract cover thumbnail (freedesktop spec.)
 
-Install imagemagick dev packages:
+    --width
+    	Image width (default "0")
+    --height
+    	Image height (default "0")
+    --fit
+    	Best fit for required width and height (default "false")
+    --no-upscale
+    	Do not upscale images already smaller than the requested width/height (default "false")
+    --dpi
+    	Document rendering resolution in DPI (PDF, EPUB, etc.), 0 uses the default (300) (default "0")
+    --filter
+    	0=NearestNeighbor, 1=Box, 2=Linear, 3=MitchellNetravali, 4=CatmullRom, 6=Gaussian, 7=Lanczos (default "2")
+    --outdir
+    	Output directory (default ".")
+    --outfile
+    	Output file (default "")
+    --size
+    	Process only files larger than size (in MB) (default "0")
+    --recursive
+    	Process subdirectories recursively (default "false")
+    --quiet
+    	Hide console output (default "false")
 
-    apt-get install libmagickcore-dev libmagickwand-dev
+  meta
+    	CBZ metadata
 
-Compile latest MuPDF:
+    --cover
+    	Print cover name (default "false")
+    --comment
+    	Print zip comment (default "false")
+    --comment-body
+    	Set zip comment (default "")
+    --file-add
+    	Add file to archive (default "")
+    --file-remove
+    	Remove file from archive (glob pattern, i.e. *.xml) (default "")
 
-    git clone git://git.ghostscript.com/mupdf.git && cd mupdf
-    git submodule update --init --recursive
-    HAVE_X11=no HAVE_GLFW=no HAVE_GLUT=no WANT_CURL=no make && make install
+  version
+    	Print version
+```
 
-Compile unarr library:
+### Examples
 
-    git clone https://github.com/zeniko/unarr && cd unarr
-    mkdir lzma920 && cd lzma920 && curl -L http://www.7-zip.org/a/lzma920.tar.bz2 | tar -xjvp && cd ..
-    curl -L http://zlib.net/zlib-1.2.8.tar.gz | tar -xzvp
-    curl -L http://www.bzip.org/1.0.6/bzip2-1.0.6.tar.gz | tar -xzvp
-    curl -L https://gist.githubusercontent.com/gen2brain/89fe506863be3fb139e8/raw/8783a7d81e22ad84944d146c5e33beab6dffc641/unarr-makefile.patch | patch -p1
-    CFLAGS="-DHAVE_7Z -DHAVE_ZLIB -DHAVE_BZIP2 -I./lzma920/C -I./zlib-1.2.8 -I./bzip2-1.0.6" make
-    cp build/debug/libunarr.a /usr/lib64/ && cp unarr.h /usr/include
+* Rescale images to 1200px for all supported files found in a directory with a size larger than 60MB:
 
-Install dependencies:
+`cbconvert --recursive --width 1200 --size 60 /media/comics/Thorgal/`
 
-    go get github.com/cheggaaa/pb
-	go get github.com/gen2brain/go-fitz
-    go get github.com/gen2brain/go-unarr
-    go get github.com/gographics/imagick/imagick
-    go get github.com/hotei/bmp
-    go get github.com/nfnt/resize
-    go get github.com/skarademir/naturalsort
-    go get gopkg.in/alecthomas/kingpin.v2
+* Convert all images in pdf to 4bit BMP images and save the result in ~/comics directory:
 
-Install go package:
+`cbconvert --format bmp --outdir ~/comics /media/comics/Garfield/Garfield_01.pdf`
+
+[BMP](http://en.wikipedia.org/wiki/BMP_file_format) format is a very good choice for black&white pages. Archive size can be smaller 2-3x and the file will be readable by comic readers.
+
+* Extract covers to ~/covers dir for all supported files found in the directory, Lanczos algorithm is used for resizing:
+
+`cbconvert cover --outdir ~/covers --filter=7 /media/comics/GrooTheWanderer/`
+
+* Convert all images to AVIF format:
+
+`cbconvert --format avif --quality 50 --width 1280 --outdir ~/comics /media/comics/Misc/`
+
+* Combine several issues into a single archive:
+
+`cbconvert convert --combine --outfile Series.cbz --outdir ~/comics issue1.cbz issue2.cbr issue3.cb7`
+
+### Quality settings
+
+This table maps quality settings for JPEG to the respective AVIF and WEBP quality settings:
+
+|              |    |    |    |    |
+|--------------|----|----|----|----|
+| JPEG quality | 50 | 60 | 70 | 80 |
+| AVIF quality | 48 | 51 | 56 | 64 |
+| WEBP quality | 55 | 64 | 72 | 82 |
 
-    go get github.com/gen2brain/cbconvert
-    go install github.com/gen2brain/cbconvert

cbconvert_archive.go

@@ -0,0 +1,526 @@
+package cbconvert
+
+import (
+	"archive/tar"
+	"archive/zip"
+	"compress/flate"
+	"context"
+	"fmt"
+	"io"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/mholt/archives"
+)
+
+// archiveSave saves workdir to CBZ archive.
+func (c *Converter) archiveSave(fileName string) error {
+	if c.Opts.Archive == "zip" {
+		return c.archiveSaveZip(fileName)
+	} else if c.Opts.Archive == "tar" {
+		return c.archiveSaveTar(fileName)
+	}
+
+	return nil
+}
+
+// archiveSaveZip saves workdir to CBZ archive.
+func (c *Converter) archiveSaveZip(fileName string) error {
+	if c.OnCompress != nil {
+		c.OnCompress()
+	}
+
+	var zipName string
+	if c.Opts.Recursive {
+		outDir := c.recursiveDir(fileName)
+		if err := os.MkdirAll(outDir, 0755); err != nil {
+			return fmt.Errorf("archiveSaveZip: %w", err)
+		}
+
+		zipName = filepath.Join(outDir, fmt.Sprintf("%s%s.cbz", baseNoExt(fileName), c.Opts.Suffix))
+	} else {
+		zipName = filepath.Join(c.Opts.OutDir, fmt.Sprintf("%s%s.cbz", baseNoExt(fileName), c.Opts.Suffix))
+	}
+
+	zipFile, err := os.Create(zipName)
+	if err != nil {
+		return fmt.Errorf("archiveSaveZip: %w", err)
+	}
+
+	z := zip.NewWriter(zipFile)
+
+	if c.Opts.ZipLevel >= 1 {
+		level := c.Opts.ZipLevel
+		z.RegisterCompressor(zip.Deflate, func(out io.Writer) (io.WriteCloser, error) {
+			return flate.NewWriter(out, level)
+		})
+	}
+
+	files, err := os.ReadDir(c.Workdir)
+	if err != nil {
+		return fmt.Errorf("archiveSaveZip: %w", err)
+	}
+
+	for _, file := range files {
+		r, err := os.ReadFile(filepath.Join(c.Workdir, file.Name()))
+		if err != nil {
+			return fmt.Errorf("archiveSaveZip: %w", err)
+		}
+
+		info, err := file.Info()
+		if err != nil {
+			return fmt.Errorf("archiveSaveZip: %w", err)
+		}
+
+		zipInfo, err := zip.FileInfoHeader(info)
+		if err != nil {
+			return fmt.Errorf("archiveSaveZip: %w", err)
+		}
+
+		zipInfo.Method = zip.Deflate
+		if c.Opts.ZipLevel == 0 {
+			zipInfo.Method = zip.Store
+		}
+		w, err := z.CreateHeader(zipInfo)
+		if err != nil {
+			return fmt.Errorf("archiveSaveZip: %w", err)
+		}
+
+		_, err = w.Write(r)
+		if err != nil {
+			return fmt.Errorf("archiveSaveZip: %w", err)
+		}
+	}
+
+	if err = z.Close(); err != nil {
+		return fmt.Errorf("archiveSaveZip: %w", err)
+	}
+
+	if err = zipFile.Close(); err != nil {
+		return fmt.Errorf("archiveSaveZip: %w", err)
+	}
+
+	err = os.RemoveAll(c.Workdir)
+	if err != nil {
+		return fmt.Errorf("archiveSaveZip: %w", err)
+	}
+
+	return nil
+}
+
+// archiveSaveTar saves workdir to CBT archive.
+func (c *Converter) archiveSaveTar(fileName string) error {
+	if c.OnCompress != nil {
+		c.OnCompress()
+	}
+
+	var tarName string
+	if c.Opts.Recursive {
+		outDir := c.recursiveDir(fileName)
+		if err := os.MkdirAll(outDir, 0755); err != nil {
+			return fmt.Errorf("archiveSaveTar: %w", err)
+		}
+
+		tarName = filepath.Join(outDir, fmt.Sprintf("%s%s.cbt", baseNoExt(fileName), c.Opts.Suffix))
+	} else {
+		tarName = filepath.Join(c.Opts.OutDir, fmt.Sprintf("%s%s.cbt", baseNoExt(fileName), c.Opts.Suffix))
+	}
+
+	tarFile, err := os.Create(tarName)
+	if err != nil {
+		return fmt.Errorf("archiveSaveTar: %w", err)
+	}
+
+	tw := tar.NewWriter(tarFile)
+
+	files, err := os.ReadDir(c.Workdir)
+	if err != nil {
+		return fmt.Errorf("archiveSaveTar: %w", err)
+	}
+
+	for _, file := range files {
+		r, err := os.ReadFile(filepath.Join(c.Workdir, file.Name()))
+		if err != nil {
+			return fmt.Errorf("archiveSaveTar: %w", err)
+		}
+
+		info, err := file.Info()
+		if err != nil {
+			return fmt.Errorf("archiveSaveTar: %w", err)
+		}
+
+		header, err := tar.FileInfoHeader(info, info.Name())
+		if err != nil {
+			return fmt.Errorf("archiveSaveTar: %w", err)
+		}
+
+		err = tw.WriteHeader(header)
+		if err != nil {
+			return fmt.Errorf("archiveSaveTar: %w", err)
+		}
+
+		_, err = tw.Write(r)
+		if err != nil {
+			return fmt.Errorf("archiveSaveTar: %w", err)
+		}
+	}
+
+	if err = tw.Close(); err != nil {
+		return fmt.Errorf("archiveSaveTar: %w", err)
+	}
+
+	if err = tarFile.Close(); err != nil {
+		return fmt.Errorf("archiveSaveTar: %w", err)
+	}
+
+	err = os.RemoveAll(c.Workdir)
+	if err != nil {
+		return fmt.Errorf("archiveSaveTar: %w", err)
+	}
+
+	return nil
+}
+
+// archiveOpen identifies the archive and returns its extractor and a reader positioned at the start.
+func archiveOpen(ctx context.Context, fileName string) (io.ReadCloser, archives.Extractor, io.Reader, error) {
+	file, err := os.Open(fileName)
+	if err != nil {
+		return nil, nil, nil, err
+	}
+
+	format, input, err := archives.Identify(ctx, fileName, file)
+	if err != nil {
+		file.Close()
+		return nil, nil, nil, err
+	}
+
+	ex, ok := format.(archives.Extractor)
+	if !ok {
+		file.Close()
+		return nil, nil, nil, fmt.Errorf("%s: unsupported archive format", fileName)
+	}
+
+	return file, ex, input, nil
+}
+
+// FileType returns the detected archive container, document extension, or "DIR".
+func FileType(path string) string {
+	if isArchive(path) {
+		file, err := os.Open(path)
+		if err == nil {
+			defer file.Close()
+
+			format, _, err := archives.Identify(context.Background(), path, file)
+			if err == nil {
+				return strings.ToUpper(strings.TrimPrefix(format.Extension(), "."))
+			}
+		}
+	}
+
+	if info, err := os.Stat(path); err == nil && info.IsDir() {
+		return "DIR"
+	}
+
+	return strings.ToUpper(strings.TrimPrefix(filepath.Ext(path), "."))
+}
+
+// archiveList lists contents of archive.
+func (c *Converter) archiveList(fileName string) ([]string, error) {
+	var contents []string
+
+	ctx := context.Background()
+
+	file, ex, input, err := archiveOpen(ctx, fileName)
+	if err != nil {
+		return contents, fmt.Errorf("archiveList: %w", err)
+	}
+	defer file.Close()
+
+	err = ex.Extract(ctx, input, func(ctx context.Context, f archives.FileInfo) error {
+		if f.IsDir() {
+			return nil
+		}
+
+		contents = append(contents, f.NameInArchive)
+
+		return nil
+	})
+	if err != nil {
+		return contents, fmt.Errorf("archiveList: %w", err)
+	}
+
+	return contents, nil
+}
+
+// archiveFile returns the contents of a single named file from the archive.
+func (c *Converter) archiveFile(fileName, name string) ([]byte, error) {
+	var data []byte
+
+	ctx := context.Background()
+
+	file, ex, input, err := archiveOpen(ctx, fileName)
+	if err != nil {
+		return nil, fmt.Errorf("archiveFile: %w", err)
+	}
+	defer file.Close()
+
+	err = ex.Extract(ctx, input, func(ctx context.Context, f archives.FileInfo) error {
+		if f.NameInArchive != name {
+			return nil
+		}
+
+		rc, err := f.Open()
+		if err != nil {
+			return err
+		}
+		defer rc.Close()
+
+		data, err = io.ReadAll(rc)
+		if err != nil {
+			return err
+		}
+
+		return fs.SkipAll
+	})
+	if err != nil {
+		return nil, fmt.Errorf("archiveFile: %w", err)
+	}
+
+	return data, nil
+}
+
+// archiveComment returns ZIP comment.
+func (c *Converter) archiveComment(fileName string) (string, error) {
+	zr, err := zip.OpenReader(fileName)
+	if err != nil {
+		return "", fmt.Errorf("archiveComment: %w", err)
+	}
+	defer zr.Close()
+
+	return zr.Comment, nil
+}
+
+// archiveSetComment sets ZIP comment.
+func (c *Converter) archiveSetComment(fileName, commentBody string) error {
+	zr, err := zip.OpenReader(fileName)
+	if err != nil {
+		return fmt.Errorf("archiveSetComment: %w", err)
+	}
+	defer zr.Close()
+
+	zf, err := os.CreateTemp(os.TempDir(), "cbc")
+	if err != nil {
+		return fmt.Errorf("archiveSetComment: %w", err)
+	}
+
+	tmpName := zf.Name()
+	defer os.Remove(tmpName)
+
+	zw := zip.NewWriter(zf)
+	err = zw.SetComment(commentBody)
+	if err != nil {
+		return fmt.Errorf("archiveSetComment: %w", err)
+	}
+
+	for _, item := range zr.File {
+		ir, err := item.OpenRaw()
+		if err != nil {
+			return fmt.Errorf("archiveSetComment: %w", err)
+		}
+
+		item := item
+
+		it, err := zw.CreateRaw(&item.FileHeader)
+		if err != nil {
+			return fmt.Errorf("archiveSetComment: %w", err)
+		}
+
+		_, err = io.Copy(it, ir)
+		if err != nil {
+			return fmt.Errorf("archiveSetComment: %w", err)
+		}
+	}
+
+	err = zw.Close()
+	if err != nil {
+		return fmt.Errorf("archiveSetComment: %w", err)
+	}
+
+	err = zf.Close()
+	if err != nil {
+		return fmt.Errorf("archiveSetComment: %w", err)
+	}
+
+	data, err := os.ReadFile(tmpName)
+	if err != nil {
+		return fmt.Errorf("archiveSetComment: %w", err)
+	}
+
+	err = os.WriteFile(fileName, data, 0644)
+	if err != nil {
+		return fmt.Errorf("archiveSetComment: %w", err)
+	}
+
+	return nil
+}
+
+// archiveFileAdd adds a file to the archive.
+func (c *Converter) archiveFileAdd(fileName, newFileName string) error {
+	zr, err := zip.OpenReader(fileName)
+	if err != nil {
+		return fmt.Errorf("archiveFileAdd: %w", err)
+	}
+	defer zr.Close()
+
+	zf, err := os.CreateTemp(os.TempDir(), "cbc")
+	if err != nil {
+		return fmt.Errorf("archiveFileAdd: %w", err)
+	}
+
+	tmpName := zf.Name()
+	defer os.Remove(tmpName)
+
+	zw := zip.NewWriter(zf)
+
+	for _, item := range zr.File {
+		if item.Name == newFileName {
+			continue
+		}
+
+		ir, err := item.OpenRaw()
+		if err != nil {
+			return fmt.Errorf("archiveFileAdd: %w", err)
+		}
+
+		item := item
+
+		it, err := zw.CreateRaw(&item.FileHeader)
+		if err != nil {
+			return fmt.Errorf("archiveFileAdd: %w", err)
+		}
+
+		_, err = io.Copy(it, ir)
+		if err != nil {
+			return fmt.Errorf("archiveFileAdd: %w", err)
+		}
+	}
+
+	info, err := os.Stat(newFileName)
+	if err != nil {
+		return fmt.Errorf("archiveFileAdd: %w", err)
+	}
+
+	newData, err := os.ReadFile(newFileName)
+	if err != nil {
+		return fmt.Errorf("archiveFileAdd: %w", err)
+	}
+
+	zipInfo, err := zip.FileInfoHeader(info)
+	if err != nil {
+		return fmt.Errorf("archiveFileAdd: %w", err)
+	}
+
+	zipInfo.Method = zip.Deflate
+	w, err := zw.CreateHeader(zipInfo)
+	if err != nil {
+		return fmt.Errorf("archiveFileAdd: %w", err)
+	}
+
+	_, err = w.Write(newData)
+	if err != nil {
+		return fmt.Errorf("archiveFileAdd: %w", err)
+	}
+
+	err = zw.Close()
+	if err != nil {
+		return fmt.Errorf("archiveFileAdd: %w", err)
+	}
+
+	err = zf.Close()
+	if err != nil {
+		return fmt.Errorf("archiveFileAdd: %w", err)
+	}
+
+	data, err := os.ReadFile(tmpName)
+	if err != nil {
+		return fmt.Errorf("archiveFileAdd: %w", err)
+	}
+
+	err = os.WriteFile(fileName, data, 0644)
+	if err != nil {
+		return fmt.Errorf("archiveFileAdd: %w", err)
+	}
+
+	return nil
+}
+
+// archiveFileRemove removes files from archive.
+func (c *Converter) archiveFileRemove(fileName, pattern string) error {
+	zr, err := zip.OpenReader(fileName)
+	if err != nil {
+		return fmt.Errorf("archiveFileRemove: %w", err)
+	}
+	defer zr.Close()
+
+	zf, err := os.CreateTemp(os.TempDir(), "cbc")
+	if err != nil {
+		return fmt.Errorf("archiveFileRemove: %w", err)
+	}
+
+	tmpName := zf.Name()
+	defer os.Remove(tmpName)
+
+	zw := zip.NewWriter(zf)
+
+	for _, item := range zr.File {
+		matched, err := filepath.Match(pattern, item.Name)
+		if err != nil {
+			return fmt.Errorf("archiveFileRemove: %w", err)
+		}
+
+		if matched {
+			continue
+		}
+
+		ir, err := item.OpenRaw()
+		if err != nil {
+			return fmt.Errorf("archiveFileRemove: %w", err)
+		}
+
+		item := item
+
+		it, err := zw.CreateRaw(&item.FileHeader)
+		if err != nil {
+			return fmt.Errorf("archiveFileRemove: %w", err)
+		}
+
+		_, err = io.Copy(it, ir)
+		if err != nil {
+			return fmt.Errorf("archiveFileRemove: %w", err)
+		}
+	}
+
+	err = zw.Close()
+	if err != nil {
+		return fmt.Errorf("archiveFileRemove: %w", err)
+	}
+
+	err = zf.Close()
+	if err != nil {
+		return fmt.Errorf("archiveFileRemove: %w", err)
+	}
+
+	data, err := os.ReadFile(tmpName)
+	if err != nil {
+		return fmt.Errorf("archiveFileRemove: %w", err)
+	}
+
+	err = os.WriteFile(fileName, data, 0644)
+	if err != nil {
+		return fmt.Errorf("archiveFileRemove: %w", err)
+	}
+
+	return nil
+}

cbconvert_convert.go

@@ -0,0 +1,414 @@
+package cbconvert
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"image"
+	"image/png"
+	"io"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"sync/atomic"
+
+	"github.com/gen2brain/avif"
+	"github.com/gen2brain/go-fitz"
+	"github.com/gen2brain/jpegli"
+	"github.com/gen2brain/jpegxl"
+	"github.com/gen2brain/webp"
+	"github.com/jsummers/gobmp"
+	"github.com/mholt/archives"
+	"golang.org/x/image/tiff"
+	"golang.org/x/sync/errgroup"
+)
+
+// convertDocument converts PDF/EPUB document to CBZ.
+func (c *Converter) convertDocument(ctx context.Context, fileName string) error {
+	doc, err := fitz.New(fileName)
+	if err != nil {
+		return fmt.Errorf("convertDocument: %w", err)
+	}
+
+	defer doc.Close()
+
+	c.Ncontents = doc.NumPage()
+	c.CurrContent = 0
+
+	if c.OnStart != nil {
+		c.OnStart()
+	}
+
+	eg, ctx := errgroup.WithContext(ctx)
+	eg.SetLimit(runtime.NumCPU() + 1)
+
+	for n := 0; n < c.Ncontents; n++ {
+		if ctx.Err() != nil {
+			return fmt.Errorf("convertDocument: %w", ctx.Err())
+		}
+
+		img, err := doc.ImageDPI(n, c.renderDPI())
+		if err != nil {
+			return fmt.Errorf("convertDocument: %w", err)
+		}
+
+		if img != nil {
+			eg.Go(func() error {
+				return c.imageConvert(ctx, img, n, "")
+			})
+		}
+	}
+
+	err = eg.Wait()
+	if err != nil {
+		return fmt.Errorf("convertDocument: %w", err)
+	}
+
+	return nil
+}
+
+// convertArchive converts archive to CBZ.
+func (c *Converter) convertArchive(ctx context.Context, fileName string) error {
+	contents, err := c.archiveList(fileName)
+	if err != nil {
+		return fmt.Errorf("convertArchive: %w", err)
+	}
+
+	images := imagesFromSlice(contents)
+
+	c.Ncontents = len(images)
+	c.CurrContent = 0
+
+	if c.OnStart != nil {
+		c.OnStart()
+	}
+
+	cover := c.coverName(images)
+
+	eg, ctx := errgroup.WithContext(ctx)
+	eg.SetLimit(runtime.NumCPU() + 1)
+
+	file, ex, input, err := archiveOpen(ctx, fileName)
+	if err != nil {
+		return fmt.Errorf("convertArchive: %w", err)
+	}
+	defer file.Close()
+
+	err = ex.Extract(ctx, input, func(ctx context.Context, f archives.FileInfo) error {
+		if err := ctx.Err(); err != nil {
+			return err
+		}
+
+		if f.IsDir() {
+			return nil
+		}
+
+		pathName := f.NameInArchive
+
+		rc, err := f.Open()
+		if err != nil {
+			return fmt.Errorf("convertArchive: %w", err)
+		}
+
+		data, err := io.ReadAll(rc)
+		if err != nil {
+			rc.Close()
+			return fmt.Errorf("convertArchive: %w", err)
+		}
+
+		if err = rc.Close(); err != nil {
+			return fmt.Errorf("convertArchive: %w", err)
+		}
+
+		if isImage(pathName) {
+			if c.Opts.NoConvert {
+				if err = copyFile(bytes.NewReader(data), c.workPath(flatName(pathName))); err != nil {
+					return fmt.Errorf("convertArchive: %w", err)
+				}
+
+				return nil
+			}
+
+			if cover == pathName && c.Opts.NoCover {
+				if err = copyFile(bytes.NewReader(data), c.workPath(flatName(pathName))); err != nil {
+					return fmt.Errorf("convertArchive: %w", err)
+				}
+
+				return nil
+			}
+
+			var img image.Image
+			img, err = c.imageDecode(bytes.NewReader(data))
+			if err != nil {
+				return fmt.Errorf("convertArchive: %w", err)
+			}
+
+			if c.Opts.NoRGB && !isGrayScale(img) {
+				if err = copyFile(bytes.NewReader(data), c.workPath(flatName(pathName))); err != nil {
+					return fmt.Errorf("convertArchive: %w", err)
+				}
+
+				return nil
+			}
+
+			if img != nil {
+				eg.Go(func() error {
+					return c.imageConvert(ctx, img, 0, pathName)
+				})
+			}
+		} else {
+			if filepath.Ext(pathName) == ".DS_Store" || strings.Contains(pathName, "__MACOSX") {
+				return nil
+			}
+
+			if c.prefix == "" && !c.Opts.NoNonImage {
+				if err = copyFile(bytes.NewReader(data), c.workPath(flatName(pathName))); err != nil {
+					return fmt.Errorf("convertArchive: %w", err)
+				}
+			}
+		}
+
+		return nil
+	})
+
+	if werr := eg.Wait(); werr != nil {
+		return fmt.Errorf("convertArchive: %w", werr)
+	}
+
+	if err != nil {
+		return fmt.Errorf("convertArchive: %w", err)
+	}
+
+	return nil
+}
+
+// convertDirectory converts directory to CBZ.
+func (c *Converter) convertDirectory(ctx context.Context, dirPath string) error {
+	contents, err := imagesFromPath(dirPath)
+	if err != nil {
+		return fmt.Errorf("convertDirectory: %w", err)
+	}
+
+	images := imagesFromSlice(contents)
+	c.Ncontents = len(images)
+	c.CurrContent = 0
+
+	if c.OnStart != nil {
+		c.OnStart()
+	}
+
+	eg, ctx := errgroup.WithContext(ctx)
+	eg.SetLimit(runtime.NumCPU() + 1)
+
+	for index, img := range contents {
+		if ctx.Err() != nil {
+			return fmt.Errorf("convertDirectory: %w", ctx.Err())
+		}
+
+		rel, rerr := filepath.Rel(dirPath, img)
+		if rerr != nil {
+			rel = filepath.Base(img)
+		}
+
+		file, err := os.Open(img)
+		if err != nil {
+			return fmt.Errorf("convertDirectory: %w", err)
+		}
+
+		if isNonImage(img) && c.prefix == "" && !c.Opts.NoNonImage {
+			if err = copyFile(file, c.workPath(flatName(rel))); err != nil {
+				return fmt.Errorf("convertDirectory: %w", err)
+			}
+
+			if err = file.Close(); err != nil {
+				return fmt.Errorf("convertDirectory: %w", err)
+			}
+
+			continue
+		} else if isImage(img) {
+			if c.Opts.NoConvert {
+				if err = copyFile(file, c.workPath(flatName(rel))); err != nil {
+					return fmt.Errorf("convertDirectory: %w", err)
+				}
+
+				if err = file.Close(); err != nil {
+					return fmt.Errorf("convertDirectory: %w", err)
+				}
+
+				continue
+			}
+
+			var i image.Image
+			i, err = c.imageDecode(file)
+			if err != nil {
+				return fmt.Errorf("convertDirectory: %w", err)
+			}
+
+			if c.Opts.NoRGB && !isGrayScale(i) {
+				if err = copyFile(file, c.workPath(flatName(rel))); err != nil {
+					return fmt.Errorf("convertDirectory: %w", err)
+				}
+
+				if err = file.Close(); err != nil {
+					return fmt.Errorf("convertDirectory: %w", err)
+				}
+
+				continue
+			}
+
+			if err = file.Close(); err != nil {
+				return fmt.Errorf("convertDirectory: %w", err)
+			}
+
+			if i != nil {
+				eg.Go(func() error {
+					return c.imageConvert(ctx, i, index, rel)
+				})
+			}
+		}
+	}
+
+	err = eg.Wait()
+	if err != nil {
+		return fmt.Errorf("convertDirectory: %w", err)
+	}
+
+	return nil
+}
+
+// workPath returns the path of name inside the workdir, with the combine prefix applied.
+func (c *Converter) workPath(name string) string {
+	return filepath.Join(c.Workdir, c.prefix+name)
+}
+
+// imageConvert converts image.Image.
+func (c *Converter) imageConvert(ctx context.Context, img image.Image, index int, pathName string) error {
+	err := ctx.Err()
+	if err != nil {
+		return fmt.Errorf("imageConvert: %w", err)
+	}
+
+	atomic.AddInt32(&c.CurrContent, 1)
+	if c.OnProgress != nil {
+		c.OnProgress()
+	}
+
+	ext := c.Opts.Format
+	if ext == "jpeg" {
+		ext = "jpg"
+	}
+
+	var fileName string
+	if pathName != "" {
+		fileName = c.workPath(fmt.Sprintf("%s.%s", flatName(strings.TrimSuffix(pathName, filepath.Ext(pathName))), ext))
+	} else {
+		fileName = c.workPath(fmt.Sprintf("%03d.%s", index, ext))
+	}
+
+	img = c.imageTransform(img)
+
+	w, err := os.Create(fileName)
+	if err != nil {
+		return fmt.Errorf("imageConvert: %w", err)
+	}
+	defer w.Close()
+
+	if err := c.imageEncode(img, w); err != nil {
+		return fmt.Errorf("imageConvert: %w", err)
+	}
+
+	return nil
+}
+
+// imageTransform transforms image (resize, rotate, brightness, contrast).
+func (c *Converter) imageTransform(img image.Image) image.Image {
+	var i = img
+
+	if c.Opts.Width > 0 || c.Opts.Height > 0 {
+		i = c.resizeFit(i)
+	}
+
+	if c.Opts.Rotate > 0 {
+		switch c.Opts.Rotate {
+		case 90:
+			i = rotate(i, 90)
+		case 180:
+			i = rotate(i, 180)
+		case 270:
+			i = rotate(i, 270)
+		}
+	}
+
+	if c.Opts.Brightness != 0 {
+		i = brightness(i, float64(c.Opts.Brightness))
+	}
+
+	if c.Opts.Contrast != 0 {
+		i = contrast(i, float64(c.Opts.Contrast))
+	}
+
+	if c.Opts.Grayscale {
+		i = imageToGray(i)
+	}
+
+	return i
+}
+
+// imageDecode decodes image from reader.
+func (c *Converter) imageDecode(reader io.Reader) (image.Image, error) {
+	img, _, err := image.Decode(reader)
+	if err != nil {
+		return img, fmt.Errorf("imageDecode: %w", err)
+	}
+
+	return img, nil
+}
+
+// imageEncode encodes image to file.
+func (c *Converter) imageEncode(img image.Image, w io.Writer) error {
+	var err error
+
+	switch c.Opts.Format {
+	case "png":
+		err = png.Encode(w, img)
+	case "tiff":
+		err = tiff.Encode(w, img, &tiff.Options{Compression: tiff.Uncompressed})
+	case "jpeg":
+		opts := &jpegli.EncodingOptions{}
+		opts.Quality = c.Opts.Quality
+		opts.ChromaSubsampling = image.YCbCrSubsampleRatio420
+		opts.ProgressiveLevel = 2
+		opts.AdaptiveQuantization = true
+		opts.DCTMethod = jpegli.DefaultDCTMethod
+		err = jpegli.Encode(w, img, opts)
+	case "webp":
+		method := webp.DefaultMethod
+		if c.Opts.Effort >= 0 {
+			method = min(max(c.Opts.Effort, 0), 6)
+		}
+		err = webp.Encode(w, img, webp.Options{Quality: c.Opts.Quality, Method: method, Lossless: c.Opts.Lossless})
+	case "avif":
+		speed := avif.DefaultSpeed
+		if c.Opts.Effort >= 0 {
+			speed = min(max(c.Opts.Effort, 0), 10)
+		}
+		err = avif.Encode(w, img, avif.Options{Quality: c.Opts.Quality, Speed: speed, Lossless: c.Opts.Lossless})
+	case "jxl":
+		effort := jpegxl.DefaultEffort
+		if c.Opts.Effort >= 0 {
+			effort = min(max(c.Opts.Effort, 1), 10)
+		}
+		err = jpegxl.Encode(w, img, jpegxl.Options{Quality: c.Opts.Quality, Effort: effort, Lossless: c.Opts.Lossless})
+	case "bmp":
+		opts := &gobmp.EncoderOptions{}
+		opts.SupportTransparency(false)
+		err = gobmp.EncodeWithOptions(w, imageToPaletted(img), opts)
+	}
+
+	if err != nil {
+		return fmt.Errorf("imageEncode: %w", err)
+	}
+
+	return nil
+}

cbconvert_cover.go

@@ -0,0 +1,142 @@
+package cbconvert
+
+import (
+	"bytes"
+	"fmt"
+	"image"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+
+	"github.com/fvbommel/sortorder"
+	"github.com/gen2brain/go-fitz"
+)
+
+// coverArchive extracts cover from archive.
+func (c *Converter) coverArchive(fileName string) (image.Image, error) {
+	var images []string
+
+	contents, err := c.archiveList(fileName)
+	if err != nil {
+		return nil, fmt.Errorf("coverArchive: %w", err)
+	}
+
+	for _, ct := range contents {
+		if isImage(ct) {
+			images = append(images, ct)
+		}
+	}
+
+	cover := c.coverName(images)
+
+	data, err := c.archiveFile(fileName, cover)
+	if err != nil {
+		return nil, fmt.Errorf("coverArchive: %w", err)
+	}
+
+	var img image.Image
+	img, err = c.imageDecode(bytes.NewReader(data))
+	if err != nil {
+		return nil, fmt.Errorf("coverArchive: %w", err)
+	}
+
+	return img, nil
+}
+
+// coverDocument extracts cover from document.
+func (c *Converter) coverDocument(fileName string) (image.Image, error) {
+	doc, err := fitz.New(fileName)
+	if err != nil {
+		return nil, fmt.Errorf("coverDocument: %w", err)
+	}
+	defer doc.Close()
+
+	img, err := doc.ImageDPI(0, c.renderDPI())
+	if err != nil {
+		return nil, fmt.Errorf("coverDocument: %w", err)
+	}
+
+	return img, nil
+}
+
+// coverDirectory extracts cover from directory.
+func (c *Converter) coverDirectory(dir string) (image.Image, error) {
+	contents, err := imagesFromPath(dir)
+	if err != nil {
+		return nil, fmt.Errorf("coverDirectory: %w", err)
+	}
+
+	images := imagesFromSlice(contents)
+	cover := c.coverName(images)
+
+	file, err := os.Open(cover)
+	if err != nil {
+		return nil, fmt.Errorf("coverDirectory: %w", err)
+	}
+	defer file.Close()
+
+	var img image.Image
+	img, err = c.imageDecode(file)
+	if err != nil {
+		return nil, fmt.Errorf("coverDirectory: %w", err)
+	}
+
+	return img, nil
+}
+
+// coverName returns the filename that is the most likely to be the cover.
+func (c *Converter) coverName(images []string) string {
+	if len(images) == 0 {
+		return ""
+	}
+
+	lower := make([]string, 0)
+	for idx, img := range images {
+		img = strings.ToLower(img)
+		lower = append(lower, img)
+		ext := baseNoExt(img)
+
+		if strings.HasPrefix(img, "cover") || strings.HasPrefix(img, "front") ||
+			strings.HasSuffix(ext, "cover") || strings.HasSuffix(ext, "front") {
+			return filepath.ToSlash(images[idx])
+		}
+	}
+
+	sort.Sort(sortorder.Natural(lower))
+	cover := lower[0]
+
+	for idx, img := range images {
+		img = strings.ToLower(img)
+		if img == cover {
+			return filepath.ToSlash(images[idx])
+		}
+	}
+
+	return ""
+}
+
+// coverImage returns cover as image.Image.
+func (c *Converter) coverImage(fileName string, fileInfo os.FileInfo) (image.Image, error) {
+	var err error
+	var cover image.Image
+
+	switch {
+	case fileInfo.IsDir():
+		cover, err = c.coverDirectory(fileName)
+	case isDocument(fileName):
+		cover, err = c.coverDocument(fileName)
+	case isArchive(fileName):
+		cover, err = c.coverArchive(fileName)
+	}
+
+	if c.OnProgress != nil {
+		c.OnProgress()
+	}
+
+	if err != nil {
+		return nil, fmt.Errorf("coverImage: %w", err)
+	}
+
+	return cover, nil
+}

cbconvert_func.go

@@ -0,0 +1,151 @@
+package cbconvert
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+// imagesFromPath returns list of found image files for given directory.
+func imagesFromPath(path string) ([]string, error) {
+	var images []string
+
+	walkFiles := func(fp string, f os.FileInfo, err error) error {
+		if !f.IsDir() && f.Mode()&os.ModeType == 0 {
+			if f.Size() > 0 && (isImage(fp)) {
+				images = append(images, fp)
+			}
+		}
+
+		return nil
+	}
+
+	f, err := filepath.Abs(path)
+	if err != nil {
+		return images, fmt.Errorf("imagesFromPath: %w", err)
+	}
+
+	stat, err := os.Stat(f)
+	if err != nil {
+		return images, fmt.Errorf("imagesFromPath: %w", err)
+	}
+
+	if !stat.IsDir() && stat.Mode()&os.ModeType == 0 {
+		if isImage(f) {
+			images = append(images, f)
+		}
+	} else {
+		err = filepath.Walk(f, walkFiles)
+		if err != nil {
+			return images, fmt.Errorf("imagesFromPath: %w", err)
+		}
+	}
+
+	return images, nil
+}
+
+// imagesFromSlice returns list of found image files for given slice of files.
+func imagesFromSlice(files []string) []string {
+	var images []string
+
+	for _, f := range files {
+		if isImage(f) {
+			images = append(images, f)
+		}
+	}
+
+	return images
+}
+
+// isArchive checks if a file is archive.
+func isArchive(f string) bool {
+	var types = []string{".rar", ".zip", ".7z", ".tar", ".cbr", ".cbz", ".cb7", ".cbt"}
+	for _, t := range types {
+		if strings.ToLower(filepath.Ext(f)) == t {
+			return true
+		}
+	}
+
+	return false
+}
+
+// isDocument checks if file is document.
+func isDocument(f string) bool {
+	var types = []string{".pdf", ".xps", ".epub", ".mobi", ".docx", ".pptx", ".xlsx"}
+	for _, t := range types {
+		if strings.ToLower(filepath.Ext(f)) == t {
+			return true
+		}
+	}
+
+	return false
+}
+
+// isImage checks if file is image.
+func isImage(f string) bool {
+	var types = []string{".jpg", ".jpeg", ".png", ".gif", ".bmp", ".tiff", ".tif", ".webp", ".avif", ".jxl"}
+	for _, t := range types {
+		if strings.ToLower(filepath.Ext(f)) == t {
+			return true
+		}
+	}
+
+	return false
+}
+
+// isNonImage checks for allowed files in archive.
+func isNonImage(f string) bool {
+	var types = []string{".nfo", ".xml", ".txt"}
+	for _, t := range types {
+		if strings.ToLower(filepath.Ext(f)) == t {
+			return true
+		}
+	}
+
+	return false
+}
+
+// isSize checks size of file.
+func isSize(a, b int64) bool {
+	if a > 0 {
+		if b < int64(a)*(1024*1024) {
+			return false
+		}
+	}
+
+	return true
+}
+
+// baseNoExt returns base name without extension.
+func baseNoExt(filename string) string {
+	return strings.TrimSuffix(filepath.Base(filename), filepath.Ext(filename))
+}
+
+// flatName flattens a path into a single collision-free name by replacing separators.
+func flatName(name string) string {
+	name = strings.ReplaceAll(name, "\\", "/")
+	return strings.ReplaceAll(name, "/", "_")
+}
+
+// copyFile copies reader to file.
+func copyFile(reader io.Reader, filename string) error {
+	err := os.MkdirAll(filepath.Dir(filename), 0755)
+	if err != nil {
+		return fmt.Errorf("copyFile: %w", err)
+	}
+
+	file, err := os.Create(filename)
+	if err != nil {
+		return fmt.Errorf("copyFile: %w", err)
+	}
+	defer file.Close()
+
+	_, err = io.Copy(file, reader)
+	if err != nil {
+		return fmt.Errorf("copyFile: %w", err)
+	}
+
+	return nil
+}

cbconvert_image.go

@@ -0,0 +1,183 @@
+package cbconvert
+
+import (
+	"image"
+	"image/color"
+	"image/draw"
+	"math"
+
+	"github.com/anthonynsimon/bild/adjust"
+	"github.com/anthonynsimon/bild/transform"
+)
+
+// Resample filters.
+const (
+	// NearestNeighbor is the fastest resampling filter, no antialiasing.
+	nearestNeighbor int = iota
+	// Box filter (averaging pixels).
+	box
+	// Linear is the bilinear filter, smooth and reasonably fast.
+	linear
+	// MitchellNetravali is a smooth bicubic filter.
+	mitchellNetravali
+	// CatmullRom is a sharp bicubic filter.
+	catmullRom
+	// Gaussian is a blurring filter, which uses gaussian function, useful for noise removal.
+	gaussian
+	// Lanczos is a high-quality resampling filter, it's slower than cubic filters.
+	lanczos
+)
+
+var filters = map[int]transform.ResampleFilter{
+	nearestNeighbor:   transform.NearestNeighbor,
+	box:               transform.Box,
+	linear:            transform.Linear,
+	mitchellNetravali: transform.MitchellNetravali,
+	catmullRom:        transform.CatmullRom,
+	gaussian:          transform.Gaussian,
+	lanczos:           transform.Lanczos,
+}
+
+func resize(img image.Image, width, height int, filter transform.ResampleFilter) *image.RGBA {
+	dstW, dstH := width, height
+
+	srcW := img.Bounds().Dx()
+	srcH := img.Bounds().Dy()
+
+	if dstW == 0 {
+		tmpW := float64(dstH) * float64(srcW) / float64(srcH)
+		dstW = int(math.Max(1.0, math.Floor(tmpW+0.5)))
+	}
+	if dstH == 0 {
+		tmpH := float64(dstW) * float64(srcH) / float64(srcW)
+		dstH = int(math.Max(1.0, math.Floor(tmpH+0.5)))
+	}
+
+	if srcW == dstW && srcH == dstH {
+		return imageToRGBA(img)
+	}
+
+	return transform.Resize(img, dstW, dstH, filter)
+}
+
+func fit(img image.Image, width, height int, filter transform.ResampleFilter) *image.RGBA {
+	maxW, maxH := width, height
+
+	b := img.Bounds()
+	srcW := b.Dx()
+	srcH := b.Dy()
+
+	if srcW <= maxW && srcH <= maxH {
+		return imageToRGBA(img)
+	}
+
+	srcAspectRatio := float64(srcW) / float64(srcH)
+	maxAspectRatio := float64(maxW) / float64(maxH)
+
+	var dstW, dstH int
+	if srcAspectRatio > maxAspectRatio {
+		dstW = maxW
+		dstH = int(float64(dstW) / srcAspectRatio)
+	} else {
+		dstH = maxH
+		dstW = int(float64(dstH) * srcAspectRatio)
+	}
+
+	return resize(img, dstW, dstH, filter)
+}
+
+// withinBounds reports whether img already fits within width by height; a zero dimension is unbounded.
+func withinBounds(img image.Image, width, height int) bool {
+	b := img.Bounds()
+
+	return (width == 0 || b.Dx() <= width) && (height == 0 || b.Dy() <= height)
+}
+
+// resizeFit resizes img to the configured width/height, honoring Fit and NoUpscale.
+func (c *Converter) resizeFit(img image.Image) image.Image {
+	if c.Opts.Fit {
+		return fit(img, c.Opts.Width, c.Opts.Height, filters[c.Opts.Filter])
+	}
+
+	if c.Opts.NoUpscale && withinBounds(img, c.Opts.Width, c.Opts.Height) {
+		return img
+	}
+
+	return resize(img, c.Opts.Width, c.Opts.Height, filters[c.Opts.Filter])
+}
+
+func rotate(img image.Image, angle float64) *image.RGBA {
+	return transform.Rotate(img, angle, &transform.RotationOptions{ResizeBounds: true, Pivot: &image.Point{}})
+}
+
+func brightness(img image.Image, change float64) *image.RGBA {
+	return adjust.Brightness(img, change/100)
+}
+
+func contrast(img image.Image, change float64) *image.RGBA {
+	return adjust.Contrast(img, change/100)
+}
+
+// imageToRGBA converts an image.Image to *image.RGBA.
+func imageToRGBA(src image.Image) *image.RGBA {
+	if dst, ok := src.(*image.RGBA); ok {
+		return dst
+	}
+
+	b := src.Bounds()
+	dst := image.NewRGBA(b)
+	draw.Draw(dst, dst.Bounds(), src, b.Min, draw.Src)
+
+	return dst
+}
+
+// imageToGray converts an image.Image to *image.Gray.
+func imageToGray(src image.Image) *image.Gray {
+	if dst, ok := src.(*image.Gray); ok {
+		return dst
+	}
+
+	b := src.Bounds()
+	dst := image.NewGray(b)
+	draw.Draw(dst, dst.Bounds(), src, b.Min, draw.Src)
+
+	return dst
+}
+
+// isGrayScale checks if the image is grayscale.
+func isGrayScale(img image.Image) bool {
+	model := img.ColorModel()
+	if model == color.GrayModel || model == color.Gray16Model {
+		return true
+	}
+
+	return false
+}
+
+var colors16 = []color.Color{
+	color.RGBA{A: 255},
+	color.RGBA{R: 17, G: 17, B: 17, A: 255},
+	color.RGBA{R: 34, G: 34, B: 34, A: 255},
+	color.RGBA{R: 51, G: 51, B: 51, A: 255},
+	color.RGBA{R: 68, G: 68, B: 68, A: 255},
+	color.RGBA{R: 85, G: 85, B: 85, A: 255},
+	color.RGBA{R: 102, G: 102, B: 102, A: 255},
+	color.RGBA{R: 119, G: 119, B: 119, A: 255},
+	color.RGBA{R: 136, G: 136, B: 136, A: 255},
+	color.RGBA{R: 153, G: 153, B: 153, A: 255},
+	color.RGBA{R: 170, G: 170, B: 170, A: 255},
+	color.RGBA{R: 187, G: 187, B: 187, A: 255},
+	color.RGBA{R: 204, G: 204, B: 204, A: 255},
+	color.RGBA{R: 221, G: 221, B: 221, A: 255},
+	color.RGBA{R: 238, G: 238, B: 238, A: 255},
+	color.RGBA{R: 255, G: 255, B: 255, A: 255},
+}
+
+// imageToPaletted converts an image.Image to *image.Paletted using 16-color palette.
+func imageToPaletted(src image.Image) *image.Paletted {
+	b := src.Bounds()
+	dst := image.NewPaletted(b, colors16)
+	draw.FloydSteinberg.Draw(dst, b, imageToGray(src), b.Min)
+
+	return dst
+}

cbconvert_test.go

@@ -0,0 +1,780 @@
+package cbconvert
+
+import (
+	"archive/zip"
+	"fmt"
+	"image"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func TestConvert(t *testing.T) {
+	tmpDir, err := os.MkdirTemp(os.TempDir(), "cbc")
+	if err != nil {
+		t.Error(err)
+	}
+
+	opts := NewOptions()
+	opts.OutDir = tmpDir
+
+	conv := New(opts)
+
+	files, err := conv.Files([]string{"testdata/test", "testdata"})
+	if err != nil {
+		t.Error(err)
+	}
+
+	for _, format := range []string{"jpeg", "png", "tiff", "bmp", "webp", "avif", "jxl"} {
+		conv.Opts.Format = format
+
+		for _, file := range files {
+			conv.Opts.Suffix = fmt.Sprintf("_%s%s", format, filepath.Ext(file.Path))
+
+			err = conv.Convert(file)
+			if err != nil {
+				t.Errorf("format %s: file %s: %v", format, file.Name, err)
+			}
+		}
+	}
+
+	err = os.RemoveAll(tmpDir)
+	if err != nil {
+		t.Error(err)
+	}
+}
+
+func TestCover(t *testing.T) {
+	tmpDir, err := os.MkdirTemp(os.TempDir(), "cbc")
+	if err != nil {
+		t.Error(err)
+	}
+
+	opts := NewOptions()
+	opts.OutDir = tmpDir
+
+	conv := New(opts)
+
+	files, err := conv.Files([]string{"testdata/test.cbt"})
+	if err != nil {
+		t.Error(err)
+	}
+
+	for _, file := range files {
+		err = conv.Cover(file)
+		if err != nil {
+			t.Error(err)
+		}
+	}
+
+	err = os.RemoveAll(tmpDir)
+	if err != nil {
+		t.Error(err)
+	}
+}
+
+func TestThumbnail(t *testing.T) {
+	tmpDir, err := os.MkdirTemp(os.TempDir(), "cbc")
+	if err != nil {
+		t.Error(err)
+	}
+
+	opts := NewOptions()
+	opts.OutDir = tmpDir
+
+	conv := New(opts)
+
+	files, err := conv.Files([]string{"testdata/test.pdf"})
+	if err != nil {
+		t.Error(err)
+	}
+
+	for _, file := range files {
+		err = conv.Thumbnail(file)
+		if err != nil {
+			t.Error(err)
+		}
+	}
+
+	err = os.RemoveAll(tmpDir)
+	if err != nil {
+		t.Error(err)
+	}
+}
+
+func TestArgs(t *testing.T) {
+	opts := NewOptions()
+	if got := opts.Args(); len(got) != 0 {
+		t.Errorf("defaults should emit no flags, got %v", got)
+	}
+
+	opts.Format = "webp"
+	opts.Quality = 90
+	opts.Effort = 4
+	opts.Lossless = true
+	opts.Width = 1200
+	opts.NoUpscale = true
+	opts.DPI = 150
+	opts.Grayscale = true
+	opts.OutDir = "/out"
+
+	got := strings.Join(opts.Args(), " ")
+	want := "--width 1200 --no-upscale --dpi 150 --format webp --quality 90 --effort 4 --lossless --grayscale --outdir /out"
+	if got != want {
+		t.Errorf("Args() = %q, want %q", got, want)
+	}
+}
+
+func TestNoUpscale(t *testing.T) {
+	tmpDir, err := os.MkdirTemp(os.TempDir(), "cbc")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	width := func(o Options) int {
+		conv := New(o)
+		files, err := conv.Files([]string{"testdata/test.cbz"})
+		if err != nil {
+			t.Fatal(err)
+		}
+		for _, file := range files {
+			if err := conv.Convert(file); err != nil {
+				t.Fatal(err)
+			}
+		}
+
+		return firstPage(t, conv, filepath.Join(tmpDir, "test.cbz")).Bounds().Dx()
+	}
+
+	base := NewOptions()
+	base.OutDir = tmpDir
+	orig := width(base)
+
+	up := NewOptions()
+	up.OutDir = tmpDir
+	up.Width = orig * 2
+	up.NoUpscale = true
+	if got := width(up); got != orig {
+		t.Errorf("NoUpscale should keep original width %d, got %d", orig, got)
+	}
+
+	no := NewOptions()
+	no.OutDir = tmpDir
+	no.Width = orig * 2
+	if got := width(no); got != orig*2 {
+		t.Errorf("without NoUpscale should upscale to %d, got %d", orig*2, got)
+	}
+
+	down := NewOptions()
+	down.OutDir = tmpDir
+	down.Width = orig / 2
+	down.NoUpscale = true
+	if got := width(down); got != orig/2 {
+		t.Errorf("NoUpscale should still downscale to %d, got %d", orig/2, got)
+	}
+}
+
+func TestConvertDPI(t *testing.T) {
+	tmpDir, err := os.MkdirTemp(os.TempDir(), "cbc")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	dims := func(dpi int) int {
+		opts := NewOptions()
+		opts.OutDir = tmpDir
+		opts.DPI = dpi
+
+		conv := New(opts)
+
+		files, err := conv.Files([]string{"testdata/test.pdf"})
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		for _, file := range files {
+			if err := conv.Convert(file); err != nil {
+				t.Fatal(err)
+			}
+		}
+
+		return firstPage(t, conv, filepath.Join(tmpDir, "test.cbz")).Bounds().Dx()
+	}
+
+	low := dims(150)
+	high := dims(600)
+	if low >= high {
+		t.Errorf("higher DPI should render larger pages: 150dpi=%d, 600dpi=%d", low, high)
+	}
+}
+
+func TestConvertResize(t *testing.T) {
+	tmpDir, err := os.MkdirTemp(os.TempDir(), "cbc")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	opts := NewOptions()
+	opts.OutDir = tmpDir
+	opts.Width = 100
+
+	conv := New(opts)
+
+	files, err := conv.Files([]string{"testdata/test.cbz"})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	for _, file := range files {
+		if err := conv.Convert(file); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	img := firstPage(t, conv, filepath.Join(tmpDir, "test.cbz"))
+	if got := img.Bounds().Dx(); got != 100 {
+		t.Errorf("resized width: got %d, want 100", got)
+	}
+}
+
+func TestConvertFit(t *testing.T) {
+	tmpDir, err := os.MkdirTemp(os.TempDir(), "cbc")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	opts := NewOptions()
+	opts.OutDir = tmpDir
+	opts.Width = 120
+	opts.Height = 120
+	opts.Fit = true
+
+	conv := New(opts)
+
+	files, err := conv.Files([]string{"testdata/test.cbz"})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	for _, file := range files {
+		if err := conv.Convert(file); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	img := firstPage(t, conv, filepath.Join(tmpDir, "test.cbz"))
+	w, h := img.Bounds().Dx(), img.Bounds().Dy()
+	if w > 120 || h > 120 {
+		t.Errorf("fit exceeded bounds: got %dx%d, want <= 120x120", w, h)
+	}
+	if w != 120 && h != 120 {
+		t.Errorf("fit did not touch a bound: got %dx%d, want one side == 120", w, h)
+	}
+}
+
+func TestConvertTar(t *testing.T) {
+	tmpDir, err := os.MkdirTemp(os.TempDir(), "cbc")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	opts := NewOptions()
+	opts.OutDir = tmpDir
+	opts.Archive = "tar"
+
+	conv := New(opts)
+
+	files, err := conv.Files([]string{"testdata/test.cbz"})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	for _, file := range files {
+		if err := conv.Convert(file); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	out := filepath.Join(tmpDir, "test.cbt")
+	list, err := conv.archiveList(out)
+	if err != nil {
+		t.Fatalf("read tar output: %v", err)
+	}
+	if len(list) != 2 {
+		t.Errorf("expected 2 pages in tar output, got %d: %v", len(list), list)
+	}
+}
+
+func TestZipLevel(t *testing.T) {
+	convertWith := func(level int) *zip.ReadCloser {
+		tmpDir, err := os.MkdirTemp(os.TempDir(), "cbc")
+		if err != nil {
+			t.Fatal(err)
+		}
+		t.Cleanup(func() { os.RemoveAll(tmpDir) })
+
+		opts := NewOptions()
+		opts.OutDir = tmpDir
+		opts.ZipLevel = level
+		opts.NoConvert = true
+
+		conv := New(opts)
+
+		files, err := conv.Files([]string{"testdata/test.cbz"})
+		if err != nil {
+			t.Fatal(err)
+		}
+		for _, file := range files {
+			if err := conv.Convert(file); err != nil {
+				t.Fatal(err)
+			}
+		}
+
+		zr, err := zip.OpenReader(filepath.Join(tmpDir, "test.cbz"))
+		if err != nil {
+			t.Fatal(err)
+		}
+		t.Cleanup(func() { zr.Close() })
+
+		return zr
+	}
+
+	store := convertWith(0)
+	for _, f := range store.File {
+		if f.Method != zip.Store {
+			t.Errorf("level 0: %s stored with method %d, want Store", f.Name, f.Method)
+		}
+		if f.CompressedSize64 != f.UncompressedSize64 {
+			t.Errorf("level 0: %s is compressed (%d < %d)", f.Name, f.CompressedSize64, f.UncompressedSize64)
+		}
+	}
+
+	deflate := convertWith(9)
+	for _, f := range deflate.File {
+		if f.Method != zip.Deflate {
+			t.Errorf("level 9: %s method %d, want Deflate", f.Name, f.Method)
+		}
+	}
+}
+
+func TestImageTransforms(t *testing.T) {
+	conv := New(NewOptions())
+
+	f, err := os.Open("testdata/test/00.jpg")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+
+	src, err := conv.imageDecode(f)
+	if err != nil {
+		t.Fatal(err)
+	}
+	srcW, srcH := src.Bounds().Dx(), src.Bounds().Dy()
+
+	conv.Opts.Rotate = 90
+	rotated := conv.imageTransform(src)
+	if rotated.Bounds().Dx() != srcH || rotated.Bounds().Dy() != srcW {
+		t.Errorf("rotate 90: got %dx%d, want %dx%d", rotated.Bounds().Dx(), rotated.Bounds().Dy(), srcH, srcW)
+	}
+
+	conv.Opts = NewOptions()
+	conv.Opts.Grayscale = true
+	gray := conv.imageTransform(src)
+	if !isGrayScale(gray) {
+		t.Errorf("grayscale: result is not grayscale")
+	}
+
+	conv.Opts = NewOptions()
+	conv.Opts.Brightness = 20
+	conv.Opts.Contrast = 20
+	adjusted := conv.imageTransform(src)
+	if adjusted.Bounds().Dx() != srcW || adjusted.Bounds().Dy() != srcH {
+		t.Errorf("brightness/contrast changed dimensions: got %dx%d, want %dx%d",
+			adjusted.Bounds().Dx(), adjusted.Bounds().Dy(), srcW, srcH)
+	}
+}
+
+func TestCoverName(t *testing.T) {
+	conv := New(NewOptions())
+
+	tests := []struct {
+		name   string
+		images []string
+		want   string
+	}{
+		{"empty", nil, ""},
+		{"natural sort", []string{"10.jpg", "2.jpg", "1.jpg"}, "1.jpg"},
+		{"cover prefix wins", []string{"01.jpg", "cover.jpg", "02.jpg"}, "cover.jpg"},
+		{"front prefix wins", []string{"01.jpg", "front.png", "00.jpg"}, "front.png"},
+		{"cover suffix wins", []string{"01.jpg", "page_cover.jpg"}, "page_cover.jpg"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := conv.coverName(tt.images); got != tt.want {
+				t.Errorf("coverName(%v) = %q, want %q", tt.images, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestCoverDirectory(t *testing.T) {
+	tmpDir, err := os.MkdirTemp(os.TempDir(), "cbc")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	opts := NewOptions()
+	opts.OutDir = tmpDir
+
+	conv := New(opts)
+
+	files, err := conv.Files([]string{"testdata/test"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(files) != 1 {
+		t.Fatalf("expected 1 directory file, got %d", len(files))
+	}
+
+	for _, file := range files {
+		if err := conv.Cover(file); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	if _, err := os.Stat(filepath.Join(tmpDir, "test.jpg")); err != nil {
+		t.Errorf("directory cover not written: %v", err)
+	}
+}
+
+func TestFileType(t *testing.T) {
+	tests := []struct {
+		path string
+		want string
+	}{
+		{"testdata/test.cbz", "ZIP"},
+		{"testdata/test.cbr", "RAR"},
+		{"testdata/test.cb7", "7Z"},
+		{"testdata/test.cbt", "TAR"},
+		{"testdata/test.pdf", "PDF"},
+		{"testdata/test", "DIR"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.path, func(t *testing.T) {
+			if got := FileType(tt.path); got != tt.want {
+				t.Errorf("FileType(%q) = %q, want %q", tt.path, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestCombine(t *testing.T) {
+	tmpDir, err := os.MkdirTemp(os.TempDir(), "cbc")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	opts := NewOptions()
+	opts.OutDir = tmpDir
+	opts.OutFile = "merged"
+
+	conv := New(opts)
+
+	files, err := conv.Files([]string{"testdata/test.cbz", "testdata/test.cbt"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(files) != 2 {
+		t.Fatalf("expected 2 input files, got %d", len(files))
+	}
+
+	if err := conv.Combine(files); err != nil {
+		t.Fatal(err)
+	}
+
+	zr, err := zip.OpenReader(filepath.Join(tmpDir, "merged.cbz"))
+	if err != nil {
+		t.Fatalf("open combined archive: %v", err)
+	}
+	defer zr.Close()
+
+	var names []string
+	for _, f := range zr.File {
+		names = append(names, f.Name)
+	}
+
+	if len(names) != 4 {
+		t.Fatalf("expected 4 pages in combined archive, got %d: %v", len(names), names)
+	}
+
+	// each input is prefixed so identically named pages do not collide
+	var first, second int
+	for _, n := range names {
+		switch {
+		case strings.HasPrefix(n, "0001_"):
+			first++
+		case strings.HasPrefix(n, "0002_"):
+			second++
+		}
+	}
+	if first != 2 || second != 2 {
+		t.Errorf("expected 2 pages from each input, got 0001_=%d 0002_=%d: %v", first, second, names)
+	}
+}
+
+func TestSubfolders(t *testing.T) {
+	page0, err := os.ReadFile("testdata/test/00.jpg")
+	if err != nil {
+		t.Fatal(err)
+	}
+	page1, err := os.ReadFile("testdata/test/01.jpg")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	inDir, err := os.MkdirTemp(os.TempDir(), "cbc-in")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(inDir)
+
+	src := filepath.Join(inDir, "chapters.cbz")
+	buildZip(t, src, []zipEntry{
+		{"chapter1/00.jpg", page0},
+		{"chapter1/01.jpg", page1},
+		{"chapter2/00.jpg", page0},
+		{"chapter2/01.jpg", page1},
+	})
+
+	tmpDir, err := os.MkdirTemp(os.TempDir(), "cbc-out")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	opts := NewOptions()
+	opts.OutDir = tmpDir
+
+	conv := New(opts)
+
+	files, err := conv.Files([]string{src})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	for _, file := range files {
+		if err := conv.Convert(file); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	zr, err := zip.OpenReader(filepath.Join(tmpDir, "chapters.cbz"))
+	if err != nil {
+		t.Fatalf("open output archive: %v", err)
+	}
+	defer zr.Close()
+
+	// without subfolder preservation chapter2/00 overwrites chapter1/00 and only 2 pages survive
+	if len(zr.File) != 4 {
+		var names []string
+		for _, f := range zr.File {
+			names = append(names, f.Name)
+		}
+		t.Fatalf("expected 4 pages from numbered subfolders, got %d: %v", len(zr.File), names)
+	}
+}
+
+func TestMeta(t *testing.T) {
+	tmpDir, err := os.MkdirTemp(os.TempDir(), "cbc")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	// operate on a copy so the fixture stays intact
+	data, err := os.ReadFile("testdata/test.cbz")
+	if err != nil {
+		t.Fatal(err)
+	}
+	archive := filepath.Join(tmpDir, "meta.cbz")
+	if err := os.WriteFile(archive, data, 0644); err != nil {
+		t.Fatal(err)
+	}
+
+	conv := New(NewOptions())
+
+	conv.Opts = NewOptions()
+	conv.Opts.CommentBody = "hello world"
+	if _, err := conv.Meta(archive); err != nil {
+		t.Fatalf("set comment: %v", err)
+	}
+
+	conv.Opts = NewOptions()
+	conv.Opts.Comment = true
+	got, err := conv.Meta(archive)
+	if err != nil {
+		t.Fatalf("get comment: %v", err)
+	}
+	if got != "hello world" {
+		t.Errorf("comment roundtrip: got %q, want %q", got, "hello world")
+	}
+
+	extra := filepath.Join(tmpDir, "ComicInfo.xml")
+	if err := os.WriteFile(extra, []byte("<ComicInfo/>"), 0644); err != nil {
+		t.Fatal(err)
+	}
+
+	conv.Opts = NewOptions()
+	conv.Opts.FileAdd = extra
+	if _, err := conv.Meta(archive); err != nil {
+		t.Fatalf("add file: %v", err)
+	}
+	if !archiveHas(t, conv, archive, "ComicInfo.xml") {
+		t.Errorf("added file not found in archive")
+	}
+
+	conv.Opts = NewOptions()
+	conv.Opts.FileRemove = "ComicInfo.xml"
+	if _, err := conv.Meta(archive); err != nil {
+		t.Fatalf("remove file: %v", err)
+	}
+	if archiveHas(t, conv, archive, "ComicInfo.xml") {
+		t.Errorf("removed file still present in archive")
+	}
+}
+
+func TestRecursive(t *testing.T) {
+	inDir, err := os.MkdirTemp(os.TempDir(), "cbc-in")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(inDir)
+
+	sub := filepath.Join(inDir, "chapter1")
+	if err := os.MkdirAll(sub, 0755); err != nil {
+		t.Fatal(err)
+	}
+
+	src, err := os.ReadFile("testdata/test.cbz")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(filepath.Join(sub, "test.cbz"), src, 0644); err != nil {
+		t.Fatal(err)
+	}
+
+	outDir, err := os.MkdirTemp(os.TempDir(), "cbc-out")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(outDir)
+
+	opts := NewOptions()
+	opts.OutDir = outDir
+	opts.Recursive = true
+
+	conv := New(opts)
+
+	files, err := conv.Files([]string{inDir})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(files) != 1 {
+		t.Fatalf("expected 1 file, got %d", len(files))
+	}
+
+	for _, file := range files {
+		if err := conv.Convert(file); err != nil {
+			t.Error(err)
+		}
+	}
+
+	// output must mirror the input subtree relative to the input root, not the absolute path
+	want := filepath.Join(outDir, "chapter1", "test.cbz")
+	if _, err := os.Stat(want); err != nil {
+		t.Errorf("expected output relative to input root at %s: %v", want, err)
+	}
+}
+
+type zipEntry struct {
+	name string
+	data []byte
+}
+
+func buildZip(t *testing.T, path string, entries []zipEntry) {
+	t.Helper()
+
+	f, err := os.Create(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer f.Close()
+
+	zw := zip.NewWriter(f)
+	for _, e := range entries {
+		w, err := zw.Create(e.name)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if _, err := w.Write(e.data); err != nil {
+			t.Fatal(err)
+		}
+	}
+	if err := zw.Close(); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func firstPage(t *testing.T, conv *Converter, archive string) image.Image {
+	t.Helper()
+
+	zr, err := zip.OpenReader(archive)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer zr.Close()
+
+	if len(zr.File) == 0 {
+		t.Fatalf("archive %s has no entries", archive)
+	}
+
+	rc, err := zr.File[0].Open()
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer rc.Close()
+
+	img, err := conv.imageDecode(rc)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	return img
+}
+
+func archiveHas(t *testing.T, conv *Converter, archive, name string) bool {
+	t.Helper()
+
+	list, err := conv.archiveList(archive)
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, n := range list {
+		if n == name {
+			return true
+		}
+	}
+
+	return false
+}

cmd/cbconvert-gui/dialogs.go

@@ -0,0 +1,172 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/gen2brain/cbconvert"
+	"github.com/gen2brain/iup-go/iup"
+)
+
+func fileDlg(title string, multiple, directory bool, dirKey string) ([]string, error) {
+	ret := make([]string, 0)
+
+	dlg := iup.FileDlg()
+	defer dlg.Destroy()
+
+	if !directory {
+		mf := "YES"
+		if !multiple {
+			mf = "NO"
+		}
+
+		dlg.SetAttributes(map[string]string{
+			"DIALOGTYPE":     "OPEN",
+			"MULTIPLEFILES":  mf,
+			"MULTIVALUEPATH": "YES",
+			"EXTFILTER":      "Comic Files|*.rar;*.zip;*.7z;*.tar;*.cbr;*.cbz;*.cb7;*.cbt;*.pdf;*.epub;*.mobi;*.docx;*.pptx|",
+			"FILTER":         "*.cb*", // for Motif
+			"TITLE":          title,
+			"SHOWPREVIEW":    "YES",
+			"PREVIEWWIDTH":   "240",
+			"PREVIEWHEIGHT":  "320",
+		})
+
+		dlg.SetCallback("FILE_CB", iup.FileFunc(previewCover()))
+	} else {
+		dlg.SetAttributes(map[string]string{
+			"DIALOGTYPE": "DIR",
+			"TITLE":      title,
+		})
+	}
+
+	setStartDir(dlg, dirKey)
+
+	iup.Popup(dlg, iup.CENTERPARENT, iup.CENTERPARENT)
+
+	if dlg.GetInt("STATUS") == 0 {
+		switch {
+		case multiple:
+			// MULTIVALUEPATH makes each MULTIVALUE a full path (id 0 is the path), so a folder-spanning selection works.
+			count := dlg.GetInt("MULTIVALUECOUNT")
+			if count > 1 {
+				for i := 1; i < count; i++ {
+					ret = append(ret, iup.GetAttributeId(dlg, "MULTIVALUE", i))
+				}
+			} else if value := dlg.GetAttribute("VALUE"); value != "" {
+				ret = append(ret, value)
+			}
+		default:
+			ret = append(ret, dlg.GetAttribute("VALUE"))
+		}
+
+		rememberDir(dlg, dirKey)
+	}
+
+	return ret, nil
+}
+
+const dlgPreviewName = "_FILEDLGPREVIEW_"
+
+// previewCover returns a FILE_CB handler that draws the highlighted comic's cover in the dialog preview pane.
+func previewCover() iup.FileFunc {
+	var image iup.Ihandle
+	var lastFile string
+
+	return func(ih iup.Ihandle, filename, status string) int {
+		switch status {
+		case "PAINT":
+			iup.DrawBegin(ih)
+			cw, ch := iup.DrawGetSize(ih)
+			iup.DrawParentBackground(ih)
+
+			if filename != lastFile {
+				lastFile = filename
+				if image != 0 {
+					image.Destroy()
+					image = 0
+				}
+				if img := loadCover(filename, cw, ch); img != 0 {
+					image = img
+					iup.SetHandle(dlgPreviewName, image)
+				}
+			}
+
+			if image != 0 {
+				iw, iih, _ := iup.DrawGetImageInfo(dlgPreviewName)
+				iup.DrawImage(ih, dlgPreviewName, (cw-iw)/2, (ch-iih)/2, iw, iih)
+			} else {
+				ih.SetAttribute("DRAWCOLOR", "128 128 128")
+				tw, th := iup.DrawGetTextSize(ih, "No preview")
+				iup.DrawText(ih, "No preview", (cw-tw)/2, (ch-th)/2, 0, 0)
+			}
+
+			iup.DrawEnd(ih)
+		case "FINISH":
+			if image != 0 {
+				image.Destroy()
+				image = 0
+			}
+			lastFile = ""
+		}
+
+		return iup.DEFAULT
+	}
+}
+
+// loadCover extracts the cover of a comic file and returns it as an IUP image fitted to w by h, or 0.
+func loadCover(path string, w, h int) iup.Ihandle {
+	if w <= 0 || h <= 0 || !isComic(path) {
+		return 0
+	}
+
+	fi, err := os.Stat(path)
+	if err != nil || fi.IsDir() {
+		return 0
+	}
+
+	opts := cbconvert.NewOptions()
+	opts.DPI = 96
+
+	img, err := cbconvert.New(opts).Preview(path, fi, w, h)
+	if err != nil || img.Image == nil {
+		return 0
+	}
+
+	return iup.ImageFromImage(img.Image)
+}
+
+func isComic(path string) bool {
+	switch strings.ToLower(filepath.Ext(path)) {
+	case ".rar", ".zip", ".7z", ".tar", ".cbr", ".cbz", ".cb7", ".cbt",
+		".pdf", ".xps", ".epub", ".mobi", ".docx", ".pptx", ".xlsx":
+		return true
+	}
+
+	return false
+}
+
+func saveDlg(title, dirKey string) string {
+	dlg := iup.FileDlg()
+	defer dlg.Destroy()
+
+	dlg.SetAttributes(map[string]string{
+		"DIALOGTYPE": "SAVE",
+		"EXTFILTER":  "Comic Files|*.cbz;*.cbt|",
+		"FILTER":     "*.cb*", // for Motif
+		"TITLE":      title,
+	})
+
+	setStartDir(dlg, dirKey)
+
+	iup.Popup(dlg, iup.CENTERPARENT, iup.CENTERPARENT)
+
+	if dlg.GetInt("STATUS") == -1 {
+		return ""
+	}
+
+	rememberDir(dlg, dirKey)
+
+	return dlg.GetAttribute("VALUE")
+}

cmd/cbconvert-gui/dist/linux/io.github.gen2brain.cbconvert.desktop

@@ -0,0 +1,10 @@
+[Desktop Entry]
+Name=CBconvert
+GenericName=A Comic Book converter
+Comment=A comic converter with support for .cb*, .pdf, .xps, .epub, .mobi and directories.
+Exec=cbconvert-gui
+Icon=io.github.gen2brain.cbconvert
+Terminal=false
+Type=Application
+StartupNotify=true
+Categories=Graphics;Utility;

cmd/cbconvert-gui/dist/linux/io.github.gen2brain.cbconvert.metainfo.xml

@@ -0,0 +1,95 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<component type="desktop-application">
+  <id>io.github.gen2brain.cbconvert</id>
+
+  <name>CBconvert</name>
+  <summary>A Comic Book converter</summary>
+
+  <metadata_license>MIT</metadata_license>
+  <project_license>GPL-3</project_license>
+
+  <description>
+    <p>
+      A comic book converter with support for .cb*, .pdf, .xps, .epub, .mobi and directories.
+      Images can be converted to JPEG, PNG, TIFF, WEBP, AVIF, JXL or 4-Bit BMP (16 colors) file format.
+    </p>
+  </description>
+
+  <developer id="com.github.gen2brain">
+    <name>Milan Nikolic</name>
+  </developer>
+
+  <launchable type="desktop-id">io.github.gen2brain.cbconvert.desktop</launchable>
+
+  <screenshots>
+    <screenshot type="default">
+      <caption>Options</caption>
+      <image>https://raw.githubusercontent.com/gen2brain/cbconvert/master/cmd/cbconvert-gui/screenshots/linux-01.jpg</image>
+    </screenshot>
+    <screenshot>
+      <caption>Converting</caption>
+      <image>https://raw.githubusercontent.com/gen2brain/cbconvert/master/cmd/cbconvert-gui/screenshots/linux-02.jpg</image>
+    </screenshot>
+  </screenshots>
+
+  <url type="homepage">https://github.com/gen2brain/cbconvert</url>
+  <url type="bugtracker">https://github.com/gen2brain/cbconvert/issues</url>
+
+  <content_rating type="oars-1.1"/>
+
+  <releases>
+    <release version="1.1.0" date="2024-11-06" type="stable">
+      <description>
+        <ul>
+          <li>Use jpegli for smaller files</li>
+          <li>Remove ImageMagick dependency</li>
+          <li>Wayland support</li>
+          <li>Support for DOCX and PPTX</li>
+        </ul>
+      </description>
+      <url type="details">https://github.com/gen2brain/cbconvert/releases/tag/v1.1.0</url>
+    </release>
+    <release version="1.0.4" date="2024-02-08" type="stable">
+      <description>
+        <ul>
+          <li>Update modules and dependencies</li>
+        </ul>
+      </description>
+      <url type="details">https://github.com/gen2brain/cbconvert/releases/tag/v1.0.4</url>
+    </release>
+    <release version="1.0.3" date="2023-09-14" type="stable">
+      <description>
+        <ul>
+          <li>Add content rating</li>
+        </ul>
+      </description>
+      <url type="details">https://github.com/gen2brain/cbconvert/releases/tag/v1.0.3</url>
+    </release>
+    <release version="1.0.2" date="2023-09-14" type="stable">
+      <description>
+        <ul>
+          <li>Change flatpak exec/command name to cbconvert</li>
+        </ul>
+      </description>
+      <url type="details">https://github.com/gen2brain/cbconvert/releases/tag/v1.0.2</url>
+    </release>
+    <release version="1.0.1" date="2023-09-14" type="stable">
+      <description>
+        <ul>
+          <li>Add flatpak manifest</li>
+        </ul>
+      </description>
+      <url type="details">https://github.com/gen2brain/cbconvert/releases/tag/v1.0.1</url>
+    </release>
+    <release version="1.0.0" date="2023-09-14" type="stable">
+      <description>
+        <ul>
+          <li>Add GUI</li>
+          <li>Add support for JPEG XL</li>
+        </ul>
+      </description>
+      <url type="details">https://github.com/gen2brain/cbconvert/releases/tag/v1.0.0</url>
+    </release>
+  </releases>
+
+</component>

cmd/cbconvert-gui/dist/linux/io.github.gen2brain.cbconvert.thumbnailer

@@ -0,0 +1,4 @@
+[Thumbnailer Entry]
+TryExec=cbconvert
+Exec=cbconvert thumbnail --quiet --width %s --outfile %o %i
+MimeType=application/pdf;application/x-cb7;application/x-cbt;application/epub+zip;application/vnd.comicbook-rar;application/vnd.comicbook+zip;application/x-mobipocket-ebook;application/vnd.ms-xpsdocument;application/vnd.openxmlformats-officedocument.wordprocessingml.document;application/vnd.openxmlformats-officedocument.presentationml.presentation;application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;

cmd/cbconvert-gui/dist/linux/modules.txt

@@ -0,0 +1,156 @@
+# github.com/anthonynsimon/bild v0.14.0
+## explicit; go 1.21
+github.com/anthonynsimon/bild/adjust
+github.com/anthonynsimon/bild/clone
+github.com/anthonynsimon/bild/math/f64
+github.com/anthonynsimon/bild/parallel
+github.com/anthonynsimon/bild/transform
+github.com/anthonynsimon/bild/util
+# github.com/dsoprea/go-exif/v2 v2.0.0-20230826092837-6579e82b732d
+## explicit; go 1.13
+github.com/dsoprea/go-exif/v2
+github.com/dsoprea/go-exif/v2/common
+github.com/dsoprea/go-exif/v2/undefined
+# github.com/dsoprea/go-logging v0.0.0-20200710184922-b02d349568dd
+## explicit; go 1.13
+github.com/dsoprea/go-logging
+# github.com/dsoprea/go-png-image-structure v0.0.0-20210512210324-29b889a6093d
+## explicit; go 1.13
+github.com/dsoprea/go-png-image-structure
+# github.com/dsoprea/go-utility v0.0.0-20221003172846-a3e1774ef349
+## explicit; go 1.12
+github.com/dsoprea/go-utility/image
+# github.com/dustin/go-humanize v1.0.1
+## explicit; go 1.16
+github.com/dustin/go-humanize
+# github.com/ebitengine/purego v0.8.1
+## explicit; go 1.18
+github.com/ebitengine/purego
+github.com/ebitengine/purego/internal/cgo
+github.com/ebitengine/purego/internal/fakecgo
+github.com/ebitengine/purego/internal/strings
+# github.com/fvbommel/sortorder v1.1.0
+## explicit; go 1.13
+github.com/fvbommel/sortorder
+# github.com/gen2brain/avif v0.4.1
+## explicit; go 1.21
+github.com/gen2brain/avif
+# github.com/gen2brain/cbconvert v1.0.5-0.20241106181414-0dee611bf1de
+## explicit; go 1.23
+github.com/gen2brain/cbconvert
+# github.com/gen2brain/go-fitz v1.24.14
+## explicit; go 1.22
+github.com/gen2brain/go-fitz
+github.com/gen2brain/go-fitz/include/mupdf
+github.com/gen2brain/go-fitz/include/mupdf/fitz
+github.com/gen2brain/go-fitz/libs
+# github.com/gen2brain/go-unarr v0.2.4
+## explicit; go 1.21
+github.com/gen2brain/go-unarr
+github.com/gen2brain/go-unarr/unarrc
+github.com/gen2brain/go-unarr/unarrc/external
+github.com/gen2brain/go-unarr/unarrc/external/bzip2
+github.com/gen2brain/go-unarr/unarrc/external/unarr
+github.com/gen2brain/go-unarr/unarrc/external/unarr/_7z
+github.com/gen2brain/go-unarr/unarrc/external/unarr/common
+github.com/gen2brain/go-unarr/unarrc/external/unarr/lzmasdk
+github.com/gen2brain/go-unarr/unarrc/external/unarr/rar
+github.com/gen2brain/go-unarr/unarrc/external/unarr/tar
+github.com/gen2brain/go-unarr/unarrc/external/unarr/zip
+github.com/gen2brain/go-unarr/unarrc/external/zlib
+# github.com/gen2brain/iup-go/iup v0.0.0-20241106050025-0f971ac33ed4
+## explicit; go 1.22
+github.com/gen2brain/iup-go/iup
+github.com/gen2brain/iup-go/iup/external
+github.com/gen2brain/iup-go/iup/external/include
+github.com/gen2brain/iup-go/iup/external/src
+github.com/gen2brain/iup-go/iup/external/src/cocoa
+github.com/gen2brain/iup-go/iup/external/src/gtk
+github.com/gen2brain/iup-go/iup/external/src/mot
+github.com/gen2brain/iup-go/iup/external/src/win
+github.com/gen2brain/iup-go/iup/external/src/win/wdl
+github.com/gen2brain/iup-go/iup/external/src/win/wdl/dummy
+github.com/gen2brain/iup-go/iup/external/srcgl
+github.com/gen2brain/iup-go/iup/manifest
+# github.com/gen2brain/jpegli v0.3.3
+## explicit; go 1.22
+github.com/gen2brain/jpegli
+# github.com/gen2brain/jpegxl v0.4.2
+## explicit; go 1.22
+github.com/gen2brain/jpegxl
+# github.com/gen2brain/webp v0.5.1
+## explicit; go 1.22
+github.com/gen2brain/webp
+# github.com/go-errors/errors v1.5.1
+## explicit; go 1.14
+github.com/go-errors/errors
+# github.com/godbus/dbus/v5 v5.1.0
+## explicit; go 1.12
+github.com/godbus/dbus/v5
+# github.com/golang/geo v0.0.0-20230421003525-6adc56603217
+## explicit; go 1.18
+github.com/golang/geo/r1
+github.com/golang/geo/r2
+github.com/golang/geo/r3
+github.com/golang/geo/s1
+github.com/golang/geo/s2
+# github.com/google/uuid v1.6.0
+## explicit
+github.com/google/uuid
+# github.com/jsummers/gobmp v0.0.0-20230614200233-a9de23ed2e25
+## explicit
+github.com/jsummers/gobmp
+# github.com/jupiterrider/ffi v0.2.1
+## explicit; go 1.18
+github.com/jupiterrider/ffi
+# github.com/tetratelabs/wazero v1.8.1
+## explicit; go 1.21
+github.com/tetratelabs/wazero
+github.com/tetratelabs/wazero/api
+github.com/tetratelabs/wazero/experimental
+github.com/tetratelabs/wazero/experimental/sys
+github.com/tetratelabs/wazero/imports/wasi_snapshot_preview1
+github.com/tetratelabs/wazero/internal/descriptor
+github.com/tetratelabs/wazero/internal/engine/interpreter
+github.com/tetratelabs/wazero/internal/engine/wazevo
+github.com/tetratelabs/wazero/internal/engine/wazevo/backend
+github.com/tetratelabs/wazero/internal/engine/wazevo/backend/isa/amd64
+github.com/tetratelabs/wazero/internal/engine/wazevo/backend/isa/arm64
+github.com/tetratelabs/wazero/internal/engine/wazevo/backend/regalloc
+github.com/tetratelabs/wazero/internal/engine/wazevo/frontend
+github.com/tetratelabs/wazero/internal/engine/wazevo/ssa
+github.com/tetratelabs/wazero/internal/engine/wazevo/wazevoapi
+github.com/tetratelabs/wazero/internal/expctxkeys
+github.com/tetratelabs/wazero/internal/filecache
+github.com/tetratelabs/wazero/internal/fsapi
+github.com/tetratelabs/wazero/internal/ieee754
+github.com/tetratelabs/wazero/internal/internalapi
+github.com/tetratelabs/wazero/internal/leb128
+github.com/tetratelabs/wazero/internal/moremath
+github.com/tetratelabs/wazero/internal/platform
+github.com/tetratelabs/wazero/internal/sock
+github.com/tetratelabs/wazero/internal/sys
+github.com/tetratelabs/wazero/internal/sysfs
+github.com/tetratelabs/wazero/internal/u32
+github.com/tetratelabs/wazero/internal/u64
+github.com/tetratelabs/wazero/internal/version
+github.com/tetratelabs/wazero/internal/wasip1
+github.com/tetratelabs/wazero/internal/wasm
+github.com/tetratelabs/wazero/internal/wasm/binary
+github.com/tetratelabs/wazero/internal/wasmdebug
+github.com/tetratelabs/wazero/internal/wasmruntime
+github.com/tetratelabs/wazero/sys
+# golang.org/x/image v0.21.0
+## explicit; go 1.18
+golang.org/x/image/ccitt
+golang.org/x/image/tiff
+golang.org/x/image/tiff/lzw
+# golang.org/x/net v0.30.0
+## explicit; go 1.18
+golang.org/x/net/context
+# golang.org/x/sync v0.8.0
+## explicit; go 1.18
+golang.org/x/sync/errgroup
+# gopkg.in/yaml.v2 v2.4.0
+## explicit; go 1.15
+gopkg.in/yaml.v2

cmd/cbconvert-gui/dist/macos/CBconvert.app/Contents/Info.plist

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>English</string>
+
+	<key>CFBundleExecutable</key>
+	<string>cbconvert-gui</string>
+
+	<key>CFBundleIconFile</key>
+	<string>icon</string>
+
+	<key>CFBundleIdentifier</key>
+	<string>io.github.gen2brain.cbconvert</string>
+
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+
+	<key>CFBundleName</key>
+	<string>CBconvert</string>
+
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+
+	<key>CFBundleShortVersionString</key>
+	<string>1.0.0</string>
+
+	<key>CFBundleVersion</key>
+	<string>1</string>
+
+	<key>NSHighResolutionCapable</key>
+	<string>True</string>
+</dict>
+</plist>

cmd/cbconvert-gui/dist/macos/CBconvert.app/Contents/Resources/Info.plist

@@ -0,0 +1,50 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>BuildMachineOSBuild</key>
+	<string>19H2</string>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleExecutable</key>
+	<string>iup</string>
+	<key>CFBundleIdentifier</key>
+	<string>br.puc-rio.tecgraf.iup</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>iup</string>
+	<key>CFBundlePackageType</key>
+	<string>FMWK</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleSupportedPlatforms</key>
+	<array>
+		<string>MacOSX</string>
+	</array>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>DTCompiler</key>
+	<string>com.apple.compilers.llvm.clang.1_0</string>
+	<key>DTPlatformBuild</key>
+	<string>12D4e</string>
+	<key>DTPlatformName</key>
+	<string>macosx</string>
+	<key>DTPlatformVersion</key>
+	<string>11.1</string>
+	<key>DTSDKBuild</key>
+	<string>20C63</string>
+	<key>DTSDKName</key>
+	<string>macosx11.1</string>
+	<key>DTXcode</key>
+	<string>1240</string>
+	<key>DTXcodeBuild</key>
+	<string>12D4e</string>
+	<key>LSMinimumSystemVersion</key>
+	<string>10.14</string>
+	<key>NSHumanReadableCopyright</key>
+	<string>Copyright © 2015 Tecgraf, PUC-Rio, Brazil. All rights reserved.</string>
+</dict>
+</plist>

cmd/cbconvert-gui/go.mod

@@ -0,0 +1,56 @@
+module github.com/gen2brain/cbconvert/cmd/cbconvert-gui
+
+go 1.26
+
+require (
+	github.com/gen2brain/cbconvert v1.0.5-0.20260623161611-a5817c3ba5de
+	github.com/gen2brain/iup-go/iup v0.32.1-0.20260604112206-a19da6654449
+)
+
+require (
+	github.com/STARRY-S/zip v0.2.3 // indirect
+	github.com/andybalholm/brotli v1.2.1 // indirect
+	github.com/anthonynsimon/bild v0.15.0 // indirect
+	github.com/bodgit/plumbing v1.3.0 // indirect
+	github.com/bodgit/sevenzip v1.6.4 // indirect
+	github.com/bodgit/windows v1.0.1 // indirect
+	github.com/dsnet/compress v0.0.2-0.20230904184137-39efe44ab707 // indirect
+	github.com/dsoprea/go-exif/v2 v2.0.0-20230826092837-6579e82b732d // indirect
+	github.com/dsoprea/go-logging v0.0.0-20200710184922-b02d349568dd // indirect
+	github.com/dsoprea/go-png-image-structure v0.0.0-20210512210324-29b889a6093d // indirect
+	github.com/dsoprea/go-utility v0.0.0-20221003172846-a3e1774ef349 // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/ebitengine/purego v0.10.1 // indirect
+	github.com/fvbommel/sortorder v1.1.0 // indirect
+	github.com/gen2brain/avif v0.5.1 // indirect
+	github.com/gen2brain/go-fitz v1.24.15 // indirect
+	github.com/gen2brain/jpegli v0.4.0 // indirect
+	github.com/gen2brain/jpegxl v0.5.1 // indirect
+	github.com/gen2brain/webp v0.6.1 // indirect
+	github.com/go-errors/errors v1.5.1 // indirect
+	github.com/golang/geo v0.0.0-20260622181633-f80708c60e82 // indirect
+	github.com/hashicorp/golang-lru/v2 v2.0.7 // indirect
+	github.com/jsummers/gobmp v0.0.0-20230614200233-a9de23ed2e25 // indirect
+	github.com/jupiterrider/ffi v0.7.0 // indirect
+	github.com/klauspost/compress v1.18.6 // indirect
+	github.com/klauspost/pgzip v1.2.6 // indirect
+	github.com/mholt/archives v0.1.5 // indirect
+	github.com/mikelolasagasti/xz v1.0.1 // indirect
+	github.com/minio/minlz v1.1.1 // indirect
+	github.com/nwaples/rardecode/v2 v2.2.5 // indirect
+	github.com/pierrec/lz4/v4 v4.1.27 // indirect
+	github.com/sorairolake/lzip-go v0.3.8 // indirect
+	github.com/spf13/afero v1.15.0 // indirect
+	github.com/stangelandcl/ppmd v0.1.1 // indirect
+	github.com/tetratelabs/wazero v1.12.0 // indirect
+	github.com/ulikunitz/xz v0.5.15 // indirect
+	go4.org v0.0.0-20260112195520-a5071408f32f // indirect
+	golang.org/x/image v0.43.0 // indirect
+	golang.org/x/net v0.56.0 // indirect
+	golang.org/x/sync v0.21.0 // indirect
+	golang.org/x/sys v0.46.0 // indirect
+	golang.org/x/text v0.38.0 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+)
+
+replace github.com/gen2brain/cbconvert => ../..

cmd/cbconvert-gui/go.sum

@@ -0,0 +1,143 @@
+github.com/STARRY-S/zip v0.2.3 h1:luE4dMvRPDOWQdeDdUxUoZkzUIpTccdKdhHHsQJ1fm4=
+github.com/STARRY-S/zip v0.2.3/go.mod h1:lqJ9JdeRipyOQJrYSOtpNAiaesFO6zVDsE8GIGFaoSk=
+github.com/andybalholm/brotli v1.2.1 h1:R+f5xP285VArJDRgowrfb9DqL18yVK0gKAW/F+eTWro=
+github.com/andybalholm/brotli v1.2.1/go.mod h1:rzTDkvFWvIrjDXZHkuS16NPggd91W3kUSvPlQ1pLaKY=
+github.com/anthonynsimon/bild v0.15.0 h1:FzvaNLuNlAPKw1Xz7V2WYOcGIEBMj8Y6ZyAk7CI+HzA=
+github.com/anthonynsimon/bild v0.15.0/go.mod h1:qIgJ9FldkCn0iy5Ad24fzUkz5R+iJ0WfhiV+6FeCB5A=
+github.com/bodgit/plumbing v1.3.0 h1:pf9Itz1JOQgn7vEOE7v7nlEfBykYqvUYioC61TwWCFU=
+github.com/bodgit/plumbing v1.3.0/go.mod h1:JOTb4XiRu5xfnmdnDJo6GmSbSbtSyufrsyZFByMtKEs=
+github.com/bodgit/sevenzip v1.6.4 h1:iHiVJfxbrB6RF4X+snI2MpVgNBKmVfGaTqZGNlMQIU0=
+github.com/bodgit/sevenzip v1.6.4/go.mod h1:ZtNi5KNgHXeXg1G7WiF0IWSuFE2eG6lt/cTGlvuirO0=
+github.com/bodgit/windows v1.0.1 h1:tF7K6KOluPYygXa3Z2594zxlkbKPAOvqr97etrGNIz4=
+github.com/bodgit/windows v1.0.1/go.mod h1:a6JLwrB4KrTR5hBpp8FI9/9W9jJfeQ2h4XDXU74ZCdM=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dsnet/compress v0.0.2-0.20230904184137-39efe44ab707 h1:2tV76y6Q9BB+NEBasnqvs7e49aEBFI8ejC89PSnWH+4=
+github.com/dsnet/compress v0.0.2-0.20230904184137-39efe44ab707/go.mod h1:qssHWj60/X5sZFNxpG4HBPDHVqxNm4DfnCKgrbZOT+s=
+github.com/dsnet/golib v0.0.0-20171103203638-1ea166775780/go.mod h1:Lj+Z9rebOhdfkVLjJ8T6VcRQv3SXugXy999NBtR9aFY=
+github.com/dsoprea/go-exif/v2 v2.0.0-20200321225314-640175a69fe4/go.mod h1:Lm2lMM2zx8p4a34ZemkaUV95AnMl4ZvLbCUbwOvLC2E=
+github.com/dsoprea/go-exif/v2 v2.0.0-20200604193436-ca8584a0e1c4/go.mod h1:9EXlPeHfblFFnwu5UOqmP2eoZfJyAZ2Ri/Vki33ajO0=
+github.com/dsoprea/go-exif/v2 v2.0.0-20230826092837-6579e82b732d h1:yeH8wrJa3+8uKKDAdURHUK1ds2UvKhMqX2MiOdVeKPs=
+github.com/dsoprea/go-exif/v2 v2.0.0-20230826092837-6579e82b732d/go.mod h1:oKrjk2kb3rAR5NbtSTLUMvMSbc+k8ZosI3MaVH47noc=
+github.com/dsoprea/go-exif/v3 v3.0.0-20200717053412-08f1b6708903/go.mod h1:0nsO1ce0mh5czxGeLo4+OCZ/C6Eo6ZlMWsz7rH/Gxv8=
+github.com/dsoprea/go-exif/v3 v3.0.0-20210512043655-120bcdb2a55e/go.mod h1:cg5SNYKHMmzxsr9X6ZeLh/nfBRHHp5PngtEPcujONtk=
+github.com/dsoprea/go-logging v0.0.0-20190624164917-c4f10aab7696/go.mod h1:Nm/x2ZUNRW6Fe5C3LxdY1PyZY5wmDv/s5dkPJ/VB3iA=
+github.com/dsoprea/go-logging v0.0.0-20200517223158-a10564966e9d/go.mod h1:7I+3Pe2o/YSU88W0hWlm9S22W7XI1JFNJ86U0zPKMf8=
+github.com/dsoprea/go-logging v0.0.0-20200710184922-b02d349568dd h1:l+vLbuxptsC6VQyQsfD7NnEC8BZuFpz45PgY+pH8YTg=
+github.com/dsoprea/go-logging v0.0.0-20200710184922-b02d349568dd/go.mod h1:7I+3Pe2o/YSU88W0hWlm9S22W7XI1JFNJ86U0zPKMf8=
+github.com/dsoprea/go-png-image-structure v0.0.0-20210512210324-29b889a6093d h1:8+qI8ant/vZkNSsbwSjIR6XJfWcDVTg/qx/3pRUUZNA=
+github.com/dsoprea/go-png-image-structure v0.0.0-20210512210324-29b889a6093d/go.mod h1:yTR3tKgyk20phAFg6IE9ulMA5NjEDD2wyx+okRFLVtw=
+github.com/dsoprea/go-utility v0.0.0-20200711062821-fab8125e9bdf/go.mod h1:95+K3z2L0mqsVYd6yveIv1lmtT3tcQQ3dVakPySffW8=
+github.com/dsoprea/go-utility v0.0.0-20221003172846-a3e1774ef349 h1:/py11NlxDaOxkT9OKN+gXgT+QOH5xj1ZRoyusfRIlo4=
+github.com/dsoprea/go-utility v0.0.0-20221003172846-a3e1774ef349/go.mod h1:KVK+/Hul09ujXAGq+42UBgCTnXkiJZRnLYdURGjQUwo=
+github.com/dsoprea/go-utility/v2 v2.0.0-20200717064901-2fccff4aa15e/go.mod h1:uAzdkPTub5Y9yQwXe8W4m2XuP0tK4a9Q/dantD0+uaU=
+github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
+github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
+github.com/ebitengine/purego v0.10.1 h1:dewVBCBT2GaMu1SrNTYxQhgQBethzfhiwvZiLGP/qyY=
+github.com/ebitengine/purego v0.10.1/go.mod h1:iIjxzd6CiRiOG0UyXP+V1+jWqUXVjPKLAI0mRfJZTmQ=
+github.com/fvbommel/sortorder v1.1.0 h1:fUmoe+HLsBTctBDoaBwpQo5N+nrCp8g/BjKb/6ZQmYw=
+github.com/fvbommel/sortorder v1.1.0/go.mod h1:uk88iVf1ovNn1iLfgUVU2F9o5eO30ui720w+kxuqRs0=
+github.com/gen2brain/avif v0.5.1 h1:LQzLsJpWyGlsa4wuZ3D57qEbCiICIK7Yidz5ZPEwzTk=
+github.com/gen2brain/avif v0.5.1/go.mod h1:QgrYqdVE9y40PCfArK9VakcMIpYeDYpZmCSLkW6C1n8=
+github.com/gen2brain/go-fitz v1.24.15 h1:sJNB1MOWkqnzzENPHggFpgxTwW0+S5WF/rM5wUBpJWo=
+github.com/gen2brain/go-fitz v1.24.15/go.mod h1:SftkiVbTHqF141DuiLwBBM65zP7ig6AVDQpf2WlHamo=
+github.com/gen2brain/iup-go/iup v0.32.1-0.20260604112206-a19da6654449 h1:HPqLUcspf4aPnyQIgeFKlLmphFVpFP34fzr1ZdnNyfc=
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cmd/cbconvert-gui/handlers.go

@@ -0,0 +1,442 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"slices"
+	"strconv"
+	"strings"
+
+	"github.com/gen2brain/cbconvert"
+	"github.com/gen2brain/iup-go/iup"
+)
+
+// selectRow focuses and selects the given 0-based row in the table.
+func selectRow(i int) {
+	if i < 0 || i >= len(files) {
+		return
+	}
+
+	index = i
+	iup.GetHandle("Table").SetAttribute("FOCUSCELL", fmt.Sprintf("%d:1", i+1))
+}
+
+// onSort re-syncs the files slice to the table's displayed order after a sort, so rows keep mapping to the right file.
+func onSort(ih iup.Ihandle, col int) int {
+	n := len(files)
+	if n < 2 {
+		return iup.DEFAULT
+	}
+
+	rowKey := func(name, size string) string {
+		return name + "\x00" + size
+	}
+
+	buckets := make(map[string][]int, n)
+	for i, f := range files {
+		size := strconv.FormatFloat(float64(f.Stat.Size())/(1024*1024), 'f', 2, 64)
+		k := rowKey(f.Name, size)
+		buckets[k] = append(buckets[k], i)
+	}
+
+	var selPath string
+	if index >= 0 && index < len(files) {
+		selPath = files[index].Path
+	}
+
+	reordered := make([]cbconvert.File, 0, n)
+	for lin := 1; lin <= n; lin++ {
+		k := rowKey(iup.GetAttributeId2(ih, "", lin, 1), iup.GetAttributeId2(ih, "", lin, 3))
+		idxs := buckets[k]
+		if len(idxs) == 0 {
+			return iup.DEFAULT
+		}
+		reordered = append(reordered, files[idxs[0]])
+		buckets[k] = idxs[1:]
+	}
+
+	files = reordered
+
+	index = -1
+	if selPath != "" {
+		for i, f := range files {
+			if f.Path == selPath {
+				selectRow(i)
+				break
+			}
+		}
+	}
+
+	return iup.DEFAULT
+}
+
+// appendFile adds a file as a new row to the table and the files slice.
+func appendFile(file cbconvert.File) {
+	files = append(files, file)
+
+	t := iup.GetHandle("Table")
+	lin := len(files)
+	t.SetAttribute("NUMLIN", strconv.Itoa(lin))
+	iup.SetAttributeId2(t, "", lin, 1, file.Name)
+	iup.SetAttributeId2(t, "", lin, 2, cbconvert.FileType(file.Path))
+	iup.SetAttributeId2(t, "", lin, 3, strconv.FormatFloat(float64(file.Stat.Size())/(1024*1024), 'f', 2, 64))
+}
+
+func previewPost() {
+	if index == -1 || len(files) == 0 {
+		return
+	}
+
+	width, height := previewSize()
+	iup.GetHandle("Loading").SetAttributes("VISIBLE=YES, START=YES")
+	if strings.ToLower(iup.GetGlobal("DRIVER")) == "motif" {
+		iup.GetHandle("Preview").SetAttribute("IMAGE", "")
+	}
+
+	opts := options()
+
+	go func(opts cbconvert.Options) {
+		conv := cbconvert.New(opts)
+
+		var s string
+		file := files[index]
+
+		img, err := conv.Preview(file.Path, file.Stat, width, height)
+		if err != nil {
+			s = err.Error()
+			fmt.Println(err)
+		}
+
+		iup.PostMessage(iup.GetHandle("Preview"), s, 0, img)
+	}(opts)
+}
+
+func onAddFiles(ih iup.Ihandle) int {
+	args, err := fileDlg("Add Files", true, false, inputDirKey)
+	if err != nil {
+		iup.PostMessage(iup.GetHandle("dlg"), err.Error(), 0, 0)
+		fmt.Println(err)
+
+		return iup.DEFAULT
+	}
+
+	if len(args) > 0 {
+		conv := cbconvert.New(options())
+
+		fs, err := conv.Files(args)
+		if err != nil {
+			iup.PostMessage(iup.GetHandle("dlg"), err.Error(), 0, 0)
+			fmt.Println(err)
+
+			return iup.DEFAULT
+		}
+
+		wasEmpty := len(files) == 0
+
+		for _, file := range fs {
+			appendFile(file)
+		}
+
+		if wasEmpty && len(files) > 0 {
+			selectRow(0)
+		}
+
+		setActive()
+
+		if wasEmpty {
+			previewPost()
+		}
+	}
+
+	return iup.DEFAULT
+}
+
+func onAddDir(ih iup.Ihandle) int {
+	args, err := fileDlg("Add Directory", false, true, inputDirKey)
+	if err != nil {
+		iup.PostMessage(iup.GetHandle("dlg"), err.Error(), 0, 0)
+		fmt.Println(err)
+
+		return iup.DEFAULT
+	}
+
+	if len(args) > 0 {
+		conv := cbconvert.New(options())
+
+		fs, err := conv.Files(args)
+		if err != nil {
+			iup.PostMessage(iup.GetHandle("dlg"), err.Error(), 0, 0)
+			fmt.Println(err)
+
+			return iup.DEFAULT
+		}
+
+		wasEmpty := len(files) == 0
+
+		for _, file := range fs {
+			appendFile(file)
+		}
+
+		if wasEmpty && len(files) > 0 {
+			selectRow(0)
+		}
+
+		setActive()
+
+		if wasEmpty {
+			previewPost()
+		}
+	}
+
+	return iup.DEFAULT
+}
+
+func onRemove(ih iup.Ihandle) int {
+	if index < 0 || index >= len(files) {
+		return iup.IGNORE
+	}
+
+	iup.GetHandle("Table").SetAttribute("DELLIN", strconv.Itoa(index+1))
+	files = slices.Delete(files, index, index+1)
+
+	if index >= len(files) {
+		index = len(files) - 1
+	}
+
+	setActive()
+	previewPost()
+
+	return iup.DEFAULT
+}
+
+func onRemoveAll(ih iup.Ihandle) int {
+	index = -1
+	files = make([]cbconvert.File, 0)
+
+	iup.GetHandle("Table").SetAttribute("NUMLIN", "0")
+	setActive()
+
+	return iup.DEFAULT
+}
+
+func onThumbnail(ih iup.Ihandle) int {
+	conv := cbconvert.New(options())
+	conv.Nfiles = len(files)
+	activeConv = conv
+	setBusy(true)
+
+	conv.OnProgress = func() {
+		iup.PostMessage(iup.GetHandle("ProgressBar"), "progress2", 0, conv)
+	}
+
+	var canceled = false
+	conv.OnCancel = func() {
+		canceled = true
+	}
+
+	iup.GetHandle("dlg").SetCallback("K_ANY", iup.KAnyFunc(func(ih iup.Ihandle, c int) int {
+		if c == iup.K_ESC {
+			conv.Cancel()
+		}
+
+		return iup.DEFAULT
+	}))
+
+	iup.PostMessage(iup.GetHandle("ProgressBar"), "start", 0, conv)
+
+	go func(c *cbconvert.Converter) {
+		for _, file := range files {
+			if canceled {
+				break
+			}
+
+			if err := c.Thumbnail(file); err != nil {
+				iup.PostMessage(iup.GetHandle("dlg"), err.Error(), 0, 0)
+				fmt.Println(err)
+
+				continue
+			}
+		}
+
+		iup.PostMessage(iup.GetHandle("ProgressBar"), "finish", 0, 0)
+	}(conv)
+
+	return iup.DEFAULT
+}
+
+func onCover(ih iup.Ihandle) int {
+	conv := cbconvert.New(options())
+	conv.Nfiles = len(files)
+	activeConv = conv
+	setBusy(true)
+
+	conv.OnProgress = func() {
+		iup.PostMessage(iup.GetHandle("ProgressBar"), "progress2", 0, conv)
+	}
+
+	var canceled = false
+	conv.OnCancel = func() {
+		canceled = true
+	}
+
+	iup.GetHandle("dlg").SetCallback("K_ANY", iup.KAnyFunc(func(ih iup.Ihandle, c int) int {
+		if c == iup.K_ESC {
+			conv.Cancel()
+		}
+
+		return iup.DEFAULT
+	}))
+
+	iup.PostMessage(iup.GetHandle("ProgressBar"), "start", 0, conv)
+
+	go func(c *cbconvert.Converter) {
+		for _, file := range files {
+			if canceled {
+				break
+			}
+
+			if err := c.Cover(file); err != nil {
+				iup.PostMessage(iup.GetHandle("dlg"), err.Error(), 0, 0)
+				fmt.Println(err)
+
+				continue
+			}
+		}
+
+		iup.PostMessage(iup.GetHandle("ProgressBar"), "finish", 0, 0)
+	}(conv)
+
+	return iup.DEFAULT
+}
+
+func onConvert(ih iup.Ihandle) int {
+	if busy {
+		if activeConv != nil {
+			activeConv.Cancel()
+		}
+
+		return iup.DEFAULT
+	}
+
+	conv := cbconvert.New(options())
+	conv.Nfiles = len(files)
+	activeConv = conv
+	setBusy(true)
+
+	conv.OnStart = func() {
+		iup.PostMessage(iup.GetHandle("ProgressBar"), "convert", 0, conv)
+	}
+
+	conv.OnProgress = func() {
+		iup.PostMessage(iup.GetHandle("ProgressBar"), "progress", 0, conv)
+	}
+
+	iup.GetHandle("dlg").SetCallback("K_ANY", iup.KAnyFunc(func(ih iup.Ihandle, c int) int {
+		if c == iup.K_ESC {
+			conv.Cancel()
+		}
+
+		return iup.DEFAULT
+	})).SetCallback("CLOSE_CB", iup.CloseFunc(func(ih iup.Ihandle) int {
+		if err := os.RemoveAll(conv.Workdir); err != nil {
+			fmt.Println(err)
+		}
+
+		return iup.DEFAULT
+	}))
+
+	convertErr := func(err error) {
+		if errors.Is(err, context.Canceled) {
+			if err := os.RemoveAll(conv.Workdir); err != nil {
+				fmt.Println(err)
+			}
+
+			return
+		}
+
+		iup.PostMessage(iup.GetHandle("dlg"), err.Error(), 0, 0)
+		fmt.Println(err)
+
+		if err := os.RemoveAll(conv.Workdir); err != nil {
+			fmt.Println(err)
+		}
+	}
+
+	go func(c *cbconvert.Converter) {
+		if c.Opts.Combine {
+			if err := c.Combine(files); err != nil {
+				convertErr(err)
+			}
+		} else {
+			for _, file := range files {
+				if err := c.Convert(file); err != nil {
+					convertErr(err)
+					if errors.Is(err, context.Canceled) {
+						break
+					}
+
+					continue
+				}
+			}
+		}
+
+		iup.PostMessage(iup.GetHandle("ProgressBar"), "finish", 0, 0)
+	}(conv)
+
+	return iup.DEFAULT
+}
+
+func onOutputDirectory(ih iup.Ihandle) int {
+	args, err := fileDlg("Output Directory", false, true, outputDirKey)
+	if err != nil {
+		iup.PostMessage(iup.GetHandle("dlg"), err.Error(), 0, 0)
+		fmt.Println(err)
+
+		return iup.DEFAULT
+	}
+
+	if len(args) == 1 {
+		iup.GetHandle("OutDir").SetAttribute("VALUE", args[0])
+	}
+
+	setActive()
+
+	return iup.DEFAULT
+}
+
+func onOutputFile(ih iup.Ihandle) int {
+	name := saveDlg("Output File", outputDirKey)
+	if name != "" {
+		iup.GetHandle("OutFile").SetAttribute("VALUE", filepath.Base(name))
+		iup.GetHandle("OutDir").SetAttribute("VALUE", filepath.Dir(name))
+		setActive()
+	}
+
+	return iup.DEFAULT
+}
+
+func onFilterChanged(ih iup.Ihandle) int {
+	switch ih.GetInt("VALUE") {
+	case 1:
+		ih.SetAttribute("TIP", "NearestNeighbor is the fastest resampling filter, no antialiasing")
+	case 2:
+		ih.SetAttribute("TIP", "Box filter (averaging pixels)")
+	case 3:
+		ih.SetAttribute("TIP", "Linear is the bilinear filter, smooth and reasonably fast")
+	case 4:
+		ih.SetAttribute("TIP", "MitchellNetravali is a smooth bicubic filter")
+	case 5:
+		ih.SetAttribute("TIP", "CatmullRom is a sharp bicubic filter")
+	case 6:
+		ih.SetAttribute("TIP", "Gaussian is a blurring filter that uses gaussian function, useful for noise removal")
+	case 7:
+		ih.SetAttribute("TIP", "Lanczos is a high-quality resampling filter, it's slower than cubic filters")
+	}
+
+	previewPost()
+
+	return iup.DEFAULT
+}

cmd/cbconvert-gui/main.go

@@ -0,0 +1,153 @@
+package main
+
+import (
+	"bytes"
+	_ "embed"
+	"flag"
+	"fmt"
+	"image/png"
+	"os"
+	"path/filepath"
+	"runtime/debug"
+	"strings"
+
+	"github.com/gen2brain/cbconvert"
+	"github.com/gen2brain/iup-go/iup"
+)
+
+//go:generate rsrc --ico dist/windows/icon.ico --arch amd64 -o main_windows_amd64.syso
+
+//go:embed assets/logo.png
+var appLogo []byte
+
+//go:embed assets/loading.gif
+var appLoading []byte
+
+var appVersion string
+
+var (
+	index = -1
+	files []cbconvert.File
+
+	config iup.Ihandle
+
+	activeConv *cbconvert.Converter
+	busy       bool
+)
+
+func init() {
+	if appVersion != "" {
+		return
+	}
+
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		return
+	}
+
+	if info.Main.Version != "" {
+		appVersion = info.Main.Version
+	}
+
+	for _, kv := range info.Settings {
+		if kv.Value == "" {
+			continue
+		}
+		if kv.Key == "vcs.revision" {
+			appVersion = kv.Value
+			if len(appVersion) > 7 {
+				appVersion = kv.Value[:7]
+			}
+		}
+	}
+}
+
+func main() {
+	parseFlags()
+
+	iup.Open()
+	defer iup.Close()
+
+	iup.SetGlobal("APPNAME", "cbconvert")
+	iup.SetGlobal("APPID", "io.github.gen2brain.cbconvert")
+	iup.SetGlobal("AUTODARKMODE", "YES")
+
+	config = iup.Config()
+	iup.ConfigLoad(config)
+
+	img, _ := png.Decode(bytes.NewReader(appLogo))
+	iup.ImageFromImage(img).SetHandle("logo")
+
+	dlg := iup.Dialog(layout()).SetAttributes(fmt.Sprintf(`TITLE="CBconvert %s", ICON=logo, SHRINK=YES`, appVersion)).SetHandle("dlg")
+
+	dlg.SetCallback("POSTMESSAGE_CB", iup.PostMessageFunc(func(ih iup.Ihandle, s string, i int, p any) int {
+		sp := strings.Split(s, ": ")
+		if len(sp) > 1 {
+			iup.MessageError(ih, fmt.Sprintf("%s\n\n%s", sp[0], strings.Join(sp[1:], ": ")))
+		}
+
+		return iup.DEFAULT
+	}))
+
+	dlg.SetCallback("RESIZE_CB", iup.ResizeFunc(func(ih iup.Ihandle, width, height int) int {
+		iup.GetHandle("Preview").SetAttribute("IMAGE", "logo")
+		iup.Refresh(ih)
+
+		previewPost()
+
+		return iup.DEFAULT
+	}))
+
+	dlg.SetCallback("THEMECHANGED_CB", iup.ThemeChangedFunc(func(ih iup.Ihandle, darkMode int) int {
+		t := iup.GetHandle("Table")
+		tableRowColors(t, darkMode == 1)
+		t.SetAttribute("REDRAW", "YES")
+
+		return iup.DEFAULT
+	}))
+
+	iup.Map(dlg)
+	profilesInit()
+
+	iup.ShowXY(dlg, iup.CENTER, iup.CENTER)
+	iup.MainLoop()
+}
+
+func parseFlags() {
+	flag.Usage = func() {
+		fmt.Fprintf(os.Stderr, "Usage: %s <command> [<flags>]\n\n", filepath.Base(os.Args[0]))
+		fmt.Fprintf(os.Stderr, "\nCommands:\n")
+		fmt.Fprintf(os.Stderr, "\n  version\n    \tPrint version\n\n")
+	}
+
+	flag.NewFlagSet("version", flag.ExitOnError)
+	flag.Parse()
+
+	if flag.NArg() >= 1 {
+		if flag.Arg(0) == "version" {
+			fmt.Println(filepath.Base(os.Args[0]), appVersion)
+			os.Exit(0)
+		} else {
+			flag.Usage()
+			os.Exit(1)
+		}
+	}
+}
+
+func layout() iup.Ihandle {
+	return iup.Vbox(
+		iup.Hbox(
+			preview(),
+			iup.Hbox(
+				iup.Vbox(
+					list(),
+					tabs(),
+				).SetAttributes("NGAP=5"),
+			).SetAttributes("NGAP=5"),
+			buttons(),
+		).SetAttributes("NGAP=5, NMARGIN=5x5"),
+
+		iup.Label("").SetAttributes("SEPARATOR=HORIZONTAL"),
+		status(),
+	)
+}

cmd/cbconvert-gui/options.go

@@ -0,0 +1,102 @@
+package main
+
+import (
+	"strconv"
+	"strings"
+
+	"github.com/gen2brain/cbconvert"
+	"github.com/gen2brain/iup-go/iup"
+)
+
+func options() cbconvert.Options {
+	var opts cbconvert.Options
+	opts.Recursive = iup.GetHandle("Recursive").GetAttribute("VALUE") == "ON"
+	opts.NoRGB = iup.GetHandle("NoRGB").GetAttribute("VALUE") == "ON"
+	opts.NoCover = iup.GetHandle("NoCover").GetAttribute("VALUE") == "ON"
+	opts.Size = iup.GetHandle("Size").GetInt("VALUE")
+	opts.OutDir = iup.GetHandle("OutDir").GetAttribute("VALUE")
+	opts.Suffix = iup.GetHandle("Suffix").GetAttribute("VALUE")
+	opts.NoConvert = iup.GetHandle("NoConvert").GetAttribute("VALUE") == "ON"
+	opts.NoNonImage = iup.GetHandle("NoNonImage").GetAttribute("VALUE") == "ON"
+	opts.Archive = strings.ToLower(iup.GetHandle("Archive").GetAttribute("VALUESTRING"))
+	opts.ZipLevel = zipLevel(iup.GetHandle("ZipLevel").GetAttribute("VALUESTRING"))
+	opts.Format = strings.ToLower(iup.GetHandle("Format").GetAttribute("VALUESTRING"))
+	opts.Width = iup.GetHandle("Width").GetInt("VALUE")
+	opts.Height = iup.GetHandle("Height").GetInt("VALUE")
+	opts.DPI = dpiValue(iup.GetHandle("DPI").GetAttribute("VALUE"))
+	opts.Fit = iup.GetHandle("Fit").GetAttribute("VALUE") == "ON"
+	opts.NoUpscale = iup.GetHandle("NoUpscale").GetAttribute("VALUE") == "ON"
+	opts.Filter = iup.GetHandle("Filter").GetInt("VALUE") - 1
+	opts.Quality = iup.GetHandle("Quality").GetInt("VALUE")
+	switch opts.Format {
+	case "webp", "avif", "jxl":
+		opts.Effort = iup.GetHandle("Effort").GetInt("VALUE")
+	default:
+		opts.Effort = -1
+	}
+	opts.Lossless = iup.GetHandle("Lossless").GetAttribute("VALUE") == "ON"
+	opts.Combine = iup.GetHandle("Combine").GetAttribute("VALUE") == "ON"
+	if opts.Combine {
+		opts.OutFile = iup.GetHandle("OutFile").GetAttribute("VALUE")
+	}
+	opts.Grayscale = iup.GetHandle("Grayscale").GetAttribute("VALUE") == "ON"
+	opts.Brightness = iup.GetHandle("Brightness").GetInt("VALUE")
+	opts.Contrast = iup.GetHandle("Contrast").GetInt("VALUE")
+	opts.Rotate = iup.GetHandle("Rotate").GetInt("VALUESTRING")
+
+	return opts
+}
+
+// shellArg quotes a command-line argument that contains whitespace.
+func shellArg(s string) string {
+	if strings.ContainsAny(s, " \t") {
+		return `"` + strings.ReplaceAll(s, `"`, `\"`) + `"`
+	}
+
+	return s
+}
+
+func commandLine() string {
+	parts := append([]string{"cbconvert", "convert"}, options().Args()...)
+	for _, file := range files {
+		parts = append(parts, file.Path)
+	}
+
+	for i, p := range parts {
+		parts[i] = shellArg(p)
+	}
+
+	return strings.Join(parts, " ")
+}
+
+func onCommand(iup.Ihandle) int {
+	iup.GetText("Command Line", commandLine(), -1)
+
+	return iup.DEFAULT
+}
+
+// zipLevel maps the compression dropdown selection to Options.ZipLevel.
+func zipLevel(value string) int {
+	switch value {
+	case "Default":
+		return -1
+	case "Store (none)":
+		return 0
+	default:
+		level, err := strconv.Atoi(value)
+		if err != nil {
+			return -1
+		}
+
+		return level
+	}
+}
+
+func dpiValue(value string) int {
+	dpi, err := strconv.Atoi(strings.TrimSpace(value))
+	if err != nil {
+		return 0
+	}
+
+	return dpi
+}

cmd/cbconvert-gui/screenshots/README.md

@@ -0,0 +1,10 @@
+## Screenshots
+
+Windows  
+<img src="windows-01.jpg" width="700" title="Windows" alt="Windows" />
+
+Linux  
+<img src="linux-01.jpg" width="700" title="Linux" alt="Linux" />
+
+macOS  
+<img src="macos-01.jpg" width="700" title="macOS" alt="macOS" />

cmd/cbconvert-gui/settings.go

@@ -0,0 +1,249 @@
+package main
+
+import (
+	"fmt"
+	"slices"
+	"strconv"
+	"strings"
+
+	"github.com/gen2brain/iup-go/iup"
+)
+
+const (
+	pathsGroup    = "Paths"
+	profilesGroup = "Profiles"
+
+	inputDirKey  = "InputDir"
+	outputDirKey = "OutputDir"
+)
+
+type settingKind int
+
+const (
+	kindBool settingKind = iota
+	kindInt
+	kindStr
+)
+
+type setting struct {
+	handle string
+	kind   settingKind
+	def    string
+}
+
+var settings = []setting{
+	{"Recursive", kindBool, "OFF"},
+	{"NoRGB", kindBool, "OFF"},
+	{"NoCover", kindBool, "OFF"},
+	{"NoConvert", kindBool, "OFF"},
+	{"NoNonImage", kindBool, "OFF"},
+	{"Combine", kindBool, "OFF"},
+	{"Fit", kindBool, "OFF"},
+	{"NoUpscale", kindBool, "OFF"},
+	{"Lossless", kindBool, "OFF"},
+	{"Grayscale", kindBool, "OFF"},
+	{"OutDir", kindStr, ""},
+	{"Suffix", kindStr, ""},
+	{"Width", kindStr, ""},
+	{"Height", kindStr, ""},
+	{"DPI", kindStr, "Default"},
+	{"Size", kindInt, "0"},
+	{"Quality", kindInt, "75"},
+	{"Effort", kindInt, "0"},
+	{"Brightness", kindInt, "0"},
+	{"Contrast", kindInt, "0"},
+	{"Format", kindInt, "1"},
+	{"Archive", kindInt, "1"},
+	{"ZipLevel", kindInt, "1"},
+	{"Filter", kindInt, "3"},
+	{"Rotate", kindInt, "1"},
+}
+
+func profileGroup(name string) string {
+	return "Profile:" + name
+}
+
+func profileNames() []string {
+	s := iup.ConfigGetVariableStr(config, profilesGroup, "Names")
+	if s == "" {
+		return nil
+	}
+
+	return strings.Split(s, ";")
+}
+
+func currentProfile() string {
+	return iup.ConfigGetVariableStrDef(config, profilesGroup, "Current", "Default")
+}
+
+func setStartDir(dlg iup.Ihandle, key string) {
+	if dir := iup.ConfigGetVariableStr(config, pathsGroup, key); dir != "" {
+		dlg.SetAttribute("DIRECTORY", dir)
+	}
+}
+
+func rememberDir(dlg iup.Ihandle, key string) {
+	dir := dlg.GetAttribute("DIRECTORY")
+	if dir == "" {
+		return
+	}
+
+	iup.ConfigSetVariableStr(config, pathsGroup, key, dir)
+	iup.ConfigSave(config)
+}
+
+func settingsSave(group string) {
+	for _, s := range settings {
+		h := iup.GetHandle(s.handle)
+		switch s.kind {
+		case kindBool:
+			v := 0
+			if h.GetAttribute("VALUE") == "ON" {
+				v = 1
+			}
+			iup.ConfigSetVariableInt(config, group, s.handle, v)
+		case kindInt:
+			iup.ConfigSetVariableInt(config, group, s.handle, h.GetInt("VALUE"))
+		case kindStr:
+			iup.ConfigSetVariableStr(config, group, s.handle, h.GetAttribute("VALUE"))
+		}
+	}
+
+	iup.ConfigSave(config)
+}
+
+// settingsApply sets every control from the given profile group, or from defaults when a group is empty.
+func settingsApply(group string) {
+	for _, s := range settings {
+		h := iup.GetHandle(s.handle)
+		switch s.kind {
+		case kindBool:
+			def := 0
+			if s.def == "ON" {
+				def = 1
+			}
+			v := def
+			if group != "" {
+				v = iup.ConfigGetVariableIntDef(config, group, s.handle, def)
+			}
+			if v != 0 {
+				h.SetAttribute("VALUE", "ON")
+			} else {
+				h.SetAttribute("VALUE", "OFF")
+			}
+		case kindInt:
+			def, _ := strconv.Atoi(s.def)
+			v := def
+			if group != "" {
+				v = iup.ConfigGetVariableIntDef(config, group, s.handle, def)
+			}
+			h.SetAttribute("VALUE", strconv.Itoa(v))
+		case kindStr:
+			v := s.def
+			if group != "" {
+				v = iup.ConfigGetVariableStrDef(config, group, s.handle, s.def)
+			}
+			h.SetAttribute("VALUE", v)
+		}
+	}
+
+	syncLabels()
+	setActive()
+	previewPost()
+}
+
+// syncLabels mirrors slider values into their value labels and retunes the effort slider for the current format.
+func syncLabels() {
+	iup.GetHandle("LabelQuality").SetAttribute("TITLE", iup.GetHandle("Quality").GetInt("VALUE"))
+	iup.GetHandle("LabelBrightness").SetAttribute("TITLE", iup.GetHandle("Brightness").GetInt("VALUE"))
+	iup.GetHandle("LabelContrast").SetAttribute("TITLE", iup.GetHandle("Contrast").GetInt("VALUE"))
+
+	format := strings.ToLower(iup.GetHandle("Format").GetAttribute("VALUESTRING"))
+	eff := iup.GetHandle("Effort").GetInt("VALUE")
+	setEffort(format)
+	switch format {
+	case "webp", "avif", "jxl":
+		val := iup.GetHandle("Effort")
+		val.SetAttribute("VALUE", strconv.Itoa(eff))
+		iup.GetHandle("LabelEffort").SetAttribute("TITLE", fmt.Sprintf("%s: %d", val.GetAttribute("EFFORTNAME"), eff))
+	}
+
+	iup.Refresh(iup.GetHandle("Tabs"))
+}
+
+func fillProfileList() {
+	list := iup.GetHandle("Profile")
+	list.SetAttribute("REMOVEITEM", "ALL")
+
+	cur := currentProfile()
+	sel := 1
+	for i, n := range profileNames() {
+		list.SetAttribute(strconv.Itoa(i+1), n)
+		if n == cur {
+			sel = i + 1
+		}
+	}
+
+	list.SetAttribute("VALUE", strconv.Itoa(sel))
+}
+
+// profilesInit loads the current profile on startup, creating a default one on the first run.
+func profilesInit() {
+	if len(profileNames()) == 0 {
+		iup.ConfigSetVariableStr(config, profilesGroup, "Names", "Default")
+		iup.ConfigSetVariableStr(config, profilesGroup, "Current", "Default")
+		settingsSave(profileGroup("Default"))
+	}
+
+	fillProfileList()
+	settingsApply(profileGroup(currentProfile()))
+}
+
+func onProfileSelect(ih iup.Ihandle) int {
+	name := ih.GetAttribute("VALUESTRING")
+	if name == "" {
+		return iup.DEFAULT
+	}
+
+	iup.ConfigSetVariableStr(config, profilesGroup, "Current", name)
+	iup.ConfigSave(config)
+
+	settingsApply(profileGroup(name))
+
+	return iup.DEFAULT
+}
+
+func onSave(iup.Ihandle) int {
+	name := currentProfile()
+	if iup.GetParam("Save Profile", nil, "Name: %s\n", &name) != 1 {
+		return iup.DEFAULT
+	}
+
+	name = strings.TrimSpace(name)
+	if name == "" || strings.ContainsAny(name, ".;") {
+		iup.Message("Invalid Name", "Profile name must not be empty or contain '.' or ';'.")
+
+		return iup.DEFAULT
+	}
+
+	settingsSave(profileGroup(name))
+
+	names := profileNames()
+	if !slices.Contains(names, name) {
+		names = append(names, name)
+		iup.ConfigSetVariableStr(config, profilesGroup, "Names", strings.Join(names, ";"))
+	}
+
+	iup.ConfigSetVariableStr(config, profilesGroup, "Current", name)
+	iup.ConfigSave(config)
+
+	fillProfileList()
+
+	return iup.DEFAULT
+}
+
+func onReset(iup.Ihandle) int {
+	settingsApply("")
+
+	return iup.DEFAULT
+}

cmd/cbconvert-gui/state.go

@@ -0,0 +1,124 @@
+package main
+
+import "github.com/gen2brain/iup-go/iup"
+
+func setActive() {
+	if busy {
+		return
+	}
+
+	opts := options()
+	count := iup.GetHandle("Table").GetInt("NUMLIN")
+
+	if count == 0 {
+		iup.GetHandle("Remove").SetAttribute("ACTIVE", "NO")
+		iup.GetHandle("RemoveAll").SetAttribute("ACTIVE", "NO")
+
+		iup.GetHandle("Preview").SetAttribute("IMAGE", "logo")
+		iup.GetHandle("PreviewInfo").SetAttribute("TITLE", "")
+	} else {
+		if index != -1 {
+			iup.GetHandle("Remove").SetAttribute("ACTIVE", "YES")
+		}
+		iup.GetHandle("RemoveAll").SetAttribute("ACTIVE", "YES")
+	}
+
+	active := "YES"
+	var tip string
+	switch {
+	case count == 0 && opts.OutDir == "":
+		active, tip = "NO", "Add files and set output directory"
+	case count == 0:
+		active, tip = "NO", "Add files"
+	case opts.OutDir == "":
+		active, tip = "NO", "Set output directory"
+	}
+
+	enabledTip := map[string]string{
+		"Thumbnail": "Extract cover thumbnails",
+		"Cover":     "Extract covers",
+		"Convert":   "Convert files to the selected format",
+	}
+
+	for _, h := range []string{"Thumbnail", "Cover", "Convert"} {
+		b := iup.GetHandle(h)
+		b.SetAttribute("ACTIVE", active)
+		if active == "YES" {
+			b.SetAttribute("TIP", enabledTip[h])
+		} else {
+			b.SetAttribute("TIP", tip)
+		}
+	}
+
+	if opts.NoConvert {
+		iup.GetHandle("VboxImage").SetAttribute("ACTIVE", "NO")
+		iup.GetHandle("VboxTransform").SetAttribute("ACTIVE", "NO")
+	} else {
+		iup.GetHandle("VboxImage").SetAttribute("ACTIVE", "YES")
+		iup.GetHandle("VboxTransform").SetAttribute("ACTIVE", "YES")
+	}
+
+	canLossless := opts.Format == "webp" || opts.Format == "avif" || opts.Format == "jxl"
+	losslessOn := canLossless && opts.Lossless
+
+	if (opts.Format == "jpeg" || canLossless) && !opts.NoConvert && !losslessOn {
+		iup.GetHandle("VboxQuality").SetAttribute("ACTIVE", "YES")
+	} else {
+		iup.GetHandle("VboxQuality").SetAttribute("ACTIVE", "NO")
+	}
+
+	if canLossless && !opts.NoConvert {
+		iup.GetHandle("VboxEffort").SetAttribute("ACTIVE", "YES")
+		iup.GetHandle("Lossless").SetAttribute("ACTIVE", "YES")
+	} else {
+		iup.GetHandle("VboxEffort").SetAttribute("ACTIVE", "NO")
+		iup.GetHandle("Lossless").SetAttribute("ACTIVE", "NO")
+	}
+
+	if opts.Width != 0 && opts.Height != 0 && !opts.NoConvert {
+		iup.GetHandle("Fit").SetAttribute("ACTIVE", "YES")
+	} else {
+		iup.GetHandle("Fit").SetAttribute("ACTIVE", "NO")
+	}
+
+	if opts.Combine {
+		iup.GetHandle("VboxOutFile").SetAttribute("ACTIVE", "YES")
+	} else {
+		iup.GetHandle("VboxOutFile").SetAttribute("ACTIVE", "NO")
+	}
+
+	if opts.Archive == "zip" {
+		iup.GetHandle("VboxZipLevel").SetAttribute("ACTIVE", "YES")
+	} else {
+		iup.GetHandle("VboxZipLevel").SetAttribute("ACTIVE", "NO")
+	}
+}
+
+// setBusy locks the UI while an operation runs and turns Convert into a Cancel button.
+func setBusy(on bool) {
+	busy = on
+
+	// Controls not governed by setActive; setActive owns the rest.
+	always := "YES"
+	if on {
+		always = "NO"
+	}
+	for _, h := range []string{"AddFiles", "AddDir", "Profile", "Reset", "Save", "Command", "Tabs", "Table"} {
+		iup.GetHandle(h).SetAttribute("ACTIVE", always)
+	}
+
+	convert := iup.GetHandle("Convert")
+	if on {
+		for _, h := range []string{"Remove", "RemoveAll", "Thumbnail", "Cover"} {
+			iup.GetHandle(h).SetAttribute("ACTIVE", "NO")
+		}
+		convert.SetAttribute("ACTIVE", "YES")
+		convert.SetAttribute("TITLE", "Cancel")
+		convert.SetAttribute("TIP", "Cancel the running operation (or press Esc)")
+	} else {
+		activeConv = nil
+		convert.SetAttribute("TITLE", "&Convert")
+		convert.SetAttribute("TIP", "Convert files to the selected format")
+		setActive() // restores the conditional buttons and option boxes
+	}
+}

cmd/cbconvert-gui/widgets.go

@@ -0,0 +1,655 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"image/gif"
+	"net/url"
+	"strconv"
+	"strings"
+
+	"github.com/gen2brain/cbconvert"
+	"github.com/gen2brain/iup-go/iup"
+)
+
+func setEffort(format string) {
+	val := iup.GetHandle("Effort")
+
+	var name string
+
+	switch format {
+	case "webp":
+		val.SetAttributes("MIN=0, MAX=6, SHOWTICKS=7, VALUE=4")
+		val.SetAttribute("TIP", "WEBP method, higher is better/slower (0-6, default 4)")
+		name = "Method"
+	case "avif":
+		val.SetAttributes("MIN=0, MAX=10, SHOWTICKS=11, VALUE=10")
+		val.SetAttribute("TIP", "AVIF speed, higher is faster/worse (0-10, default 10)")
+		name = "Speed"
+	case "jxl":
+		val.SetAttributes("MIN=1, MAX=10, SHOWTICKS=10, VALUE=7")
+		val.SetAttribute("TIP", "JXL effort, higher is better/slower (1-10, default 7)")
+		name = "Effort"
+	default:
+		return
+	}
+
+	val.SetAttribute("EFFORTNAME", name)
+	iup.GetHandle("LabelEffort").SetAttribute("TITLE", fmt.Sprintf("%s: %d", name, val.GetInt("VALUE")))
+	iup.Refresh(iup.GetHandle("LabelEffort"))
+}
+
+// tableRowColors sets the alternating row colors for dark or light mode.
+func tableRowColors(t iup.Ihandle, dark bool) {
+	even, odd := "#F0F0F0", "#FFFFFF"
+	if dark {
+		even, odd = "#3A3A3A", "#2D2D2D"
+	}
+	t.SetAttribute("EVENROWCOLOR", even)
+	t.SetAttribute("ODDROWCOLOR", odd)
+}
+
+func list() iup.Ihandle {
+	t := iup.Table().SetHandle("Table")
+	t.SetAttributes(map[string]string{
+		"EXPAND":         "YES",
+		"NUMCOL":         "3",
+		"NUMLIN":         "0",
+		"TITLE1":         "Title",
+		"TITLE2":         "Type",
+		"TITLE3":         "Size (MiB)",
+		"WIDTH1":         "150",
+		"WIDTH2":         "50",
+		"WIDTH3":         "100",
+		"ALIGNMENT2":     "ACENTER",
+		"ALIGNMENT3":     "ARIGHT",
+		"SELECTIONMODE":  "SINGLE",
+		"USERRESIZE":     "YES",
+		"STRETCHLAST":    "NO",
+		"FOCUSRECT":      "NO",
+		"SORTABLE":       "YES",
+		"ALTERNATECOLOR": "YES",
+	})
+
+	tableRowColors(t, iup.GetGlobal("DARKMODE") == "YES" && iup.GetGlobal("AUTODARKMODE") == "YES")
+
+	t.SetCallback("ENTERITEM_CB", iup.EnterItemFunc(func(ih iup.Ihandle, lin, col int) int {
+		index = lin - 1
+		setActive()
+		previewPost()
+
+		return iup.DEFAULT
+	}))
+
+	t.SetCallback("SORT_CB", iup.TableSortFunc(onSort))
+
+	t.SetCallback("DROPFILES_CB", iup.DropFilesFunc(func(ih iup.Ihandle, fileName string, num, x, y int) int {
+		dec, err := url.QueryUnescape(fileName)
+		if err != nil {
+			iup.PostMessage(iup.GetHandle("dlg"), err.Error(), 0, 0)
+			fmt.Println(err)
+
+			return iup.DEFAULT
+		}
+
+		conv := cbconvert.New(options())
+
+		fs, err := conv.Files([]string{dec})
+		if err != nil {
+			iup.PostMessage(iup.GetHandle("dlg"), err.Error(), 0, 0)
+			fmt.Println(err)
+
+			return iup.DEFAULT
+		}
+
+		wasEmpty := len(files) == 0
+
+		for _, file := range fs {
+			appendFile(file)
+		}
+
+		if wasEmpty && len(files) > 0 {
+			selectRow(0)
+		}
+
+		setActive()
+
+		if wasEmpty {
+			previewPost()
+		}
+
+		return iup.DEFAULT
+	}))
+
+	return iup.Vbox(t)
+}
+
+func previewSize() (int, int) {
+	var width, height int
+	sp := strings.Split(iup.GetHandle("Preview").GetAttribute("RASTERSIZE"), "x")
+	if len(sp) == 2 {
+		width, _ = strconv.Atoi(sp[0])
+		height, _ = strconv.Atoi(sp[1])
+	}
+
+	return width, height
+}
+
+func preview() iup.Ihandle {
+	return iup.Frame(
+		iup.Vbox(
+			iup.Label("").SetAttributes("EXPAND=YES, ALIGNMENT=ACENTER, MINSIZE=400x, IMAGE=cover").SetHandle("Preview").
+				SetCallback("POSTMESSAGE_CB", iup.PostMessageFunc(func(ih iup.Ihandle, s string, i int, p any) int {
+					img := p.(cbconvert.Image)
+
+					iup.GetHandle("Loading").SetAttributes("VISIBLE=NO, STOP=YES")
+
+					if img.Image != nil && len(s) == 0 {
+						iup.Destroy(iup.GetHandle("cover"))
+						iup.ImageFromImage(img.Image).SetHandle("cover")
+
+						ih.SetAttribute("IMAGE", "cover")
+						iup.GetHandle("PreviewInfo").SetAttribute("TITLE", fmt.Sprintf("%s (%dx%d)", img.SizeHuman, img.Width, img.Height))
+					} else {
+						ih.SetAttribute("IMAGE", "logo")
+						iup.GetHandle("PreviewInfo").SetAttribute("TITLE", "")
+
+						sp := strings.Split(s, ": ")
+						if len(sp) > 1 {
+							iup.MessageError(ih, fmt.Sprintf("%s\n\n%s", sp[0], strings.Join(sp[1:], ": ")))
+						}
+					}
+
+					return iup.DEFAULT
+				})),
+			iup.Label("").SetAttributes("EXPAND=HORIZONTAL, ALIGNMENT=ACENTER").SetHandle("PreviewInfo"),
+		),
+	)
+}
+
+func tabInput() iup.Ihandle {
+	return iup.Hbox(
+		iup.Vbox(
+			iup.Toggle(" Recurse SubDirectories").SetHandle("Recursive").
+				SetAttributes(`TIP="Process subdirectories recursively"`),
+			iup.Toggle(" Only Grayscale Images").SetHandle("NoRGB").
+				SetAttributes(`TIP="Do not convert images that have RGB colorspace"`),
+			iup.Toggle(" Exclude Cover").SetHandle("NoCover").
+				SetAttributes(`TIP="Do not convert the cover image"`),
+			iup.Toggle(" Remove Non-Image Files from the Archive").SetHandle("NoNonImage").
+				SetAttribute("TIP", "Remove .nfo, .xml, .txt files from the archive"),
+			iup.Toggle(" Do not Transform or Convert Images").SetHandle("NoConvert").
+				SetAttributes(`TIP="Copy images from archive or directory without modifications"`).
+				SetCallback("VALUECHANGED_CB", iup.ValueChangedFunc(func(ih iup.Ihandle) int {
+					setActive()
+
+					return iup.DEFAULT
+				})),
+		).SetAttributes("NGAP=10"),
+		iup.Space().SetAttribute("SIZE", "15"),
+		iup.Vbox(
+			iup.Vbox(
+				iup.Label("Minimum Size (MiB):"),
+				iup.Text().SetAttributes(`SPIN=YES, SPINMAX=2048, VISIBLECOLUMNS=4, MASK="/d*"`).SetHandle("Size").
+					SetAttributes(`TIP="Process only files larger than minimum size"`),
+			),
+			iup.Vbox(
+				iup.Label("Document DPI:"),
+				iup.List().SetAttributes(map[string]string{
+					"DROPDOWN":       "YES",
+					"EDITBOX":        "YES",
+					"VISIBLECOLUMNS": "6",
+					"VALUE":          "Default",
+					"1":              "Default",
+					"2":              "150",
+					"3":              "300",
+					"4":              "600",
+					"5":              "1200",
+				}).SetHandle("DPI").
+					SetAttribute("TIP", "Resolution for rendering documents (PDF, EPUB, etc.); Default is 300"),
+			),
+		).SetAttributes("NGAP=10"),
+	).SetHandle("VboxInput")
+}
+
+func tabOutput() iup.Ihandle {
+	return iup.Hbox(
+		iup.Vbox(
+			iup.Vbox(
+				iup.Label("Output Directory:"),
+				iup.Text().SetAttributes("VISIBLECOLUMNS=16, MINSIZE=100x").SetHandle("OutDir").
+					SetAttribute("TIP", "Directory where converted files are written (required)").
+					SetCallback("VALUECHANGED_CB", iup.ValueChangedFunc(func(ih iup.Ihandle) int {
+						setActive()
+
+						return iup.DEFAULT
+					})),
+				iup.Space().SetAttribute("SIZE", "5x0"),
+				iup.Button("Browse...").SetAttributes("PADDING=DEFAULTBUTTONPADDING").
+					SetCallback("ACTION", iup.ActionFunc(onOutputDirectory)),
+			),
+			iup.Vbox(
+				iup.Label("Add Suffix to Output File:"),
+				iup.Text().SetAttributes("VISIBLECOLUMNS=16, MINSIZE=100x").SetHandle("Suffix").
+					SetAttribute("TIP", "Add suffix to filename, i.e. filename_suffix.cbz"),
+			),
+			iup.Vbox(
+				iup.Label("Archive Format:"),
+				iup.List().SetAttributes(map[string]string{
+					"DROPDOWN": "YES",
+					"VALUE":    "1",
+					"1":        "ZIP",
+					"2":        "TAR",
+				}).SetHandle("Archive").
+					SetAttribute("TIP", "Output container: ZIP (.cbz) or uncompressed TAR (.cbt)").
+					SetCallback("VALUECHANGED_CB", iup.ValueChangedFunc(func(ih iup.Ihandle) int {
+						setActive()
+
+						return iup.DEFAULT
+					})),
+			),
+			iup.Vbox(
+				iup.Label("Compression:"),
+				iup.List().SetAttributes(map[string]string{
+					"DROPDOWN": "YES",
+					"VALUE":    "1",
+					"1":        "Default",
+					"2":        "Store (none)",
+					"3":        "1",
+					"4":        "2",
+					"5":        "3",
+					"6":        "4",
+					"7":        "5",
+					"8":        "6",
+					"9":        "7",
+					"10":       "8",
+					"11":       "9",
+				}).SetHandle("ZipLevel").
+					SetAttribute("TIP", "ZIP compression: Store disables it, 1 is fastest, 9 is smallest"),
+			).SetHandle("VboxZipLevel"),
+		).SetAttributes("NGAP=10"),
+		iup.Space().SetAttribute("SIZE", "15"),
+		iup.Vbox(
+			iup.Vbox(
+				iup.Toggle(" Combine into single file").SetHandle("Combine").
+					SetAttributes(`TIP="Merge all listed files into one archive"`).
+					SetCallback("VALUECHANGED_CB", iup.ValueChangedFunc(func(ih iup.Ihandle) int {
+						setActive()
+
+						return iup.DEFAULT
+					})),
+			),
+			iup.Vbox(
+				iup.Label("Output File:"),
+				iup.Text().SetAttributes("VISIBLECOLUMNS=16, MINSIZE=100x").SetHandle("OutFile").
+					SetAttribute("TIP", "Combined file name (default: first input + -combined)"),
+				iup.Space().SetAttribute("SIZE", "5x0"),
+				iup.Button("Browse...").SetAttributes("PADDING=DEFAULTBUTTONPADDING").
+					SetCallback("ACTION", iup.ActionFunc(onOutputFile)),
+			).SetHandle("VboxOutFile"),
+		).SetAttributes("NGAP=10"),
+	).SetHandle("VboxOutput")
+}
+
+func tabImage() iup.Ihandle {
+	return iup.Hbox(
+		iup.Vbox(
+			iup.Vbox(
+				iup.Label("Format:"),
+				iup.List().SetAttributes(map[string]string{
+					"DROPDOWN": "YES",
+					"VALUE":    "1",
+					"1":        "JPEG",
+					"2":        "PNG",
+					"3":        "TIFF",
+					"4":        "BMP",
+					"5":        "WEBP",
+					"6":        "AVIF",
+					"7":        "JXL",
+				}).SetHandle("Format").
+					SetAttribute("TIP", "Output image format for the converted pages").
+					SetCallback("VALUECHANGED_CB", iup.ValueChangedFunc(func(ih iup.Ihandle) int {
+						setEffort(strings.ToLower(ih.GetAttribute("VALUESTRING")))
+						setActive()
+						previewPost()
+
+						return iup.DEFAULT
+					})),
+			),
+			iup.Vbox(
+				iup.Label("Size:"),
+				iup.Hbox(
+					iup.Text().SetAttributes(`CUEBANNER="width", VISIBLECOLUMNS=6, MASK="/d*"`).SetHandle("Width").
+						SetAttribute("TIP", "If one of, width or height is not set, the image aspect ratio is preserved").
+						SetCallback("VALUECHANGED_CB", iup.ValueChangedFunc(func(ih iup.Ihandle) int {
+							setActive()
+							ih.SetAttribute("MYVALUE", ih.GetInt("VALUE"))
+
+							return iup.DEFAULT
+						})).
+						SetCallback("KILLFOCUS_CB", iup.KillFocusFunc(func(ih iup.Ihandle) int {
+							if ih.GetAttribute("MYVALUE") != "" {
+								previewPost()
+							}
+							ih.SetAttribute("MYVALUE", "")
+
+							return iup.DEFAULT
+						})),
+					iup.Space().SetAttribute("SIZE", "2"),
+					iup.Label("x"),
+					iup.Space().SetAttribute("SIZE", "2"),
+					iup.Text().SetAttributes(`CUEBANNER="height", VISIBLECOLUMNS=6, MASK="/d*"`).SetHandle("Height").
+						SetAttribute("TIP", "If one of, width or height is not set, the image aspect ratio is preserved").
+						SetCallback("VALUECHANGED_CB", iup.ValueChangedFunc(func(ih iup.Ihandle) int {
+							setActive()
+							ih.SetAttribute("MYVALUE", ih.GetInt("VALUE"))
+
+							return iup.DEFAULT
+						})).
+						SetCallback("KILLFOCUS_CB", iup.KillFocusFunc(func(ih iup.Ihandle) int {
+							if ih.GetAttribute("MYVALUE") != "" {
+								previewPost()
+							}
+							ih.SetAttribute("MYVALUE", "")
+
+							return iup.DEFAULT
+						})),
+				).SetAttributes("ALIGNMENT=ACENTER, NMARGIN=0"),
+			),
+			iup.Vbox(
+				iup.Toggle(" Best Fit").SetHandle("Fit").
+					SetAttributes(`TIP="Best fit for required width and height"`),
+				iup.Toggle(" No Upscale").SetHandle("NoUpscale").
+					SetAttribute("TIP", "Do not enlarge images already smaller than the requested size"),
+			),
+			iup.Vbox(
+				iup.Label("Resize Filter:"),
+				iup.List().SetAttributes(map[string]string{
+					"DROPDOWN": "YES",
+					"VALUE":    "3",
+					"TIP":      "Linear is the bilinear filter, smooth and reasonably fast",
+					"1":        "NearestNeighbor",
+					"2":        "Box",
+					"3":        "Linear",
+					"4":        "MitchellNetravali",
+					"5":        "CatmullRom",
+					"6":        "Gaussian",
+					"7":        "Lanczos",
+				}).SetHandle("Filter").SetCallback("VALUECHANGED_CB", iup.ValueChangedFunc(onFilterChanged)),
+			),
+		).SetAttributes("NGAP=10"),
+		iup.Space().SetAttribute("SIZE", "15"),
+		iup.Vbox(
+			iup.Vbox(
+				iup.Hbox(
+					iup.Label("Quality: "),
+					iup.Label("75").SetHandle("LabelQuality"),
+				).SetAttributes("NMARGIN=0"),
+				iup.Val("").SetAttributes(`MIN=0, MAX=100, VALUE=75, SHOWTICKS=10`).SetHandle("Quality").
+					SetAttribute("TIP", "Quality affects JPEG, WEBP, AVIF and JXL").
+					SetCallback("VALUECHANGED_CB", iup.ValueChangedFunc(func(ih iup.Ihandle) int {
+						iup.GetHandle("LabelQuality").SetAttribute("TITLE", ih.GetInt("VALUE"))
+						iup.Refresh(iup.GetHandle("LabelQuality"))
+						ih.SetAttribute("MYVALUE", ih.GetInt("VALUE"))
+
+						return iup.DEFAULT
+					})).
+					SetCallback("KILLFOCUS_CB", iup.KillFocusFunc(func(ih iup.Ihandle) int {
+						if ih.GetAttribute("MYVALUE") != "" {
+							previewPost()
+						}
+						ih.SetAttribute("MYVALUE", "")
+
+						return iup.DEFAULT
+					})),
+			).SetHandle("VboxQuality"),
+			iup.Vbox(
+				iup.Label("Effort:").SetHandle("LabelEffort"),
+				iup.Val("").SetAttributes(`MIN=0, MAX=10, VALUE=0, SHOWTICKS=11`).SetHandle("Effort").
+					SetAttribute("TIP", "Encoder speed/effort (WEBP, AVIF, JXL)").
+					SetCallback("VALUECHANGED_CB", iup.ValueChangedFunc(func(ih iup.Ihandle) int {
+						iup.GetHandle("LabelEffort").SetAttribute("TITLE", fmt.Sprintf("%s: %d", ih.GetAttribute("EFFORTNAME"), ih.GetInt("VALUE")))
+						iup.Refresh(iup.GetHandle("LabelEffort"))
+						ih.SetAttribute("MYVALUE", ih.GetInt("VALUE"))
+
+						return iup.DEFAULT
+					})).
+					SetCallback("KILLFOCUS_CB", iup.KillFocusFunc(func(ih iup.Ihandle) int {
+						if ih.GetAttribute("MYVALUE") != "" {
+							previewPost()
+						}
+						ih.SetAttribute("MYVALUE", "")
+
+						return iup.DEFAULT
+					})),
+			).SetHandle("VboxEffort"),
+			iup.Vbox(
+				iup.Toggle(" Lossless").SetHandle("Lossless").
+					SetAttributes(`TIP="Lossless compression (WEBP, AVIF, JXL), ignores quality"`).
+					SetCallback("VALUECHANGED_CB", iup.ValueChangedFunc(func(ih iup.Ihandle) int {
+						setActive()
+						previewPost()
+
+						return iup.DEFAULT
+					})),
+			),
+			iup.Vbox(
+				iup.Toggle(" Grayscale").SetHandle("Grayscale").
+					SetAttributes(`TIP="Convert images to grayscale (monochromatic)"`).
+					SetCallback("VALUECHANGED_CB", iup.ValueChangedFunc(func(ih iup.Ihandle) int {
+						previewPost()
+
+						return iup.DEFAULT
+					})),
+			),
+		).SetAttributes("NGAP=10"),
+	).SetHandle("VboxImage")
+}
+
+func tabTransform() iup.Ihandle {
+	return iup.Vbox(
+		iup.Vbox(
+			iup.Hbox(
+				iup.Label("Brightness: "),
+				iup.Label("0").SetHandle("LabelBrightness"),
+			).SetAttributes("ALIGNMENT=ACENTER, NMARGIN=0"),
+			iup.Val("").SetAttributes(`MIN=-100, MAX=100, VALUE=0, SHOWTICKS=10`).SetHandle("Brightness").
+				SetAttributes(`TIP="Adjust the brightness of the images"`).
+				SetCallback("VALUECHANGED_CB", iup.ValueChangedFunc(func(ih iup.Ihandle) int {
+					iup.GetHandle("LabelBrightness").SetAttribute("TITLE", iup.GetHandle("Brightness").GetInt("VALUE"))
+					iup.Refresh(iup.GetHandle("LabelBrightness"))
+					ih.SetAttribute("MYVALUE", ih.GetInt("VALUE"))
+
+					return iup.DEFAULT
+				})).
+				SetCallback("KILLFOCUS_CB", iup.KillFocusFunc(func(ih iup.Ihandle) int {
+					if ih.GetAttribute("MYVALUE") != "" {
+						previewPost()
+					}
+					ih.SetAttribute("MYVALUE", "")
+
+					return iup.DEFAULT
+				})),
+		),
+		iup.Vbox(
+			iup.Hbox(
+				iup.Label("Contrast: "),
+				iup.Label("0").SetHandle("LabelContrast"),
+			).SetAttributes("ALIGNMENT=ACENTER, NMARGIN=0"),
+			iup.Val("").SetAttributes(`MIN=-100, MAX=100, VALUE=0, SHOWTICKS=10`).SetHandle("Contrast").
+				SetAttributes(`TIP="Adjust the contrast of the images"`).
+				SetCallback("VALUECHANGED_CB", iup.ValueChangedFunc(func(ih iup.Ihandle) int {
+					iup.GetHandle("LabelContrast").SetAttribute("TITLE", iup.GetHandle("Contrast").GetInt("VALUE"))
+					iup.Refresh(iup.GetHandle("LabelContrast"))
+					ih.SetAttribute("MYVALUE", ih.GetInt("VALUE"))
+
+					return iup.DEFAULT
+				})).
+				SetCallback("KILLFOCUS_CB", iup.KillFocusFunc(func(ih iup.Ihandle) int {
+					if ih.GetAttribute("MYVALUE") != "" {
+						previewPost()
+					}
+					ih.SetAttribute("MYVALUE", "")
+
+					return iup.DEFAULT
+				})),
+		),
+		iup.Vbox(
+			iup.Label("Rotate:"),
+			iup.List().SetAttributes(map[string]string{
+				"DROPDOWN": "YES",
+				"VALUE":    "1",
+				"1":        "0",
+				"2":        "90",
+				"3":        "180",
+				"4":        "270",
+			}).SetHandle("Rotate").
+				SetAttribute("TIP", "Rotate every page clockwise by the given angle in degrees").
+				SetCallback("VALUECHANGED_CB", iup.ValueChangedFunc(func(ih iup.Ihandle) int {
+					previewPost()
+
+					return iup.DEFAULT
+				})),
+		),
+	).SetHandle("VboxTransform").SetAttributes("NGAP=10")
+}
+
+func tabs() iup.Ihandle {
+	return iup.Tabs(
+		tabInput().SetAttributes("TABTITLE=Input, NMARGIN=10x10"),
+		tabOutput().SetAttributes("TABTITLE=Output, NMARGIN=10x10"),
+		tabImage().SetAttributes("TABTITLE=Image, NMARGIN=10x10"),
+		tabTransform().SetAttributes("TABTITLE=Transform, NMARGIN=10x10"),
+	).SetHandle("Tabs")
+}
+
+func buttons() iup.Ihandle {
+	addFiles := iup.Button("Add &Files...").SetHandle("AddFiles").SetAttributes("PADDING=DEFAULTBUTTONPADDING").
+		SetCallback("ACTION", iup.ActionFunc(onAddFiles))
+	addDir := iup.Button("Add &Dir...").SetHandle("AddDir").SetAttributes("PADDING=DEFAULTBUTTONPADDING").
+		SetCallback("ACTION", iup.ActionFunc(onAddDir))
+	remove := iup.Button("Remove").SetHandle("Remove").SetAttributes("PADDING=DEFAULTBUTTONPADDING").
+		SetCallback("ACTION", iup.ActionFunc(onRemove))
+	removeAll := iup.Button("Remove All").SetHandle("RemoveAll").SetAttributes("PADDING=DEFAULTBUTTONPADDING").
+		SetCallback("ACTION", iup.ActionFunc(onRemoveAll))
+	thumbnail := iup.Button("Thumbnail").SetHandle("Thumbnail").SetAttributes("PADDING=DEFAULTBUTTONPADDING").
+		SetCallback("ACTION", iup.ActionFunc(onThumbnail))
+	cover := iup.Button("Cover").SetHandle("Cover").SetAttributes("PADDING=DEFAULTBUTTONPADDING").
+		SetCallback("ACTION", iup.ActionFunc(onCover))
+	convert := iup.Button("&Convert").SetHandle("Convert").SetAttributes("PADDING=DEFAULTBUTTONPADDING").
+		SetCallback("ACTION", iup.ActionFunc(onConvert))
+	reset := iup.Button("Reset").SetHandle("Reset").SetAttributes("PADDING=DEFAULTBUTTONPADDING").
+		SetAttribute("TIP", "Restore all settings to their defaults").
+		SetCallback("ACTION", iup.ActionFunc(onReset))
+	save := iup.Button("Save").SetHandle("Save").SetAttributes("PADDING=DEFAULTBUTTONPADDING").
+		SetAttribute("TIP", "Save current settings to a profile").
+		SetCallback("ACTION", iup.ActionFunc(onSave))
+
+	command := iup.Button("Command").SetHandle("Command").SetAttributes("PADDING=DEFAULTBUTTONPADDING").
+		SetAttribute("TIP", "Show the equivalent command line").
+		SetCallback("ACTION", iup.ActionFunc(onCommand))
+
+	profile := iup.List().SetAttributes("DROPDOWN=YES").SetHandle("Profile").
+		SetAttribute("TIP", "Select a settings profile").
+		SetCallback("VALUECHANGED_CB", iup.ValueChangedFunc(onProfileSelect))
+
+	iup.Normalizer(addFiles, addDir, remove, removeAll, thumbnail, cover, convert, reset, save, command).SetAttribute("NORMALIZE", "BOTH")
+	iup.Normalizer(addFiles, addDir, remove, removeAll, thumbnail, cover, convert, reset, save, command, profile).SetAttribute("NORMALIZE", "HORIZONTAL")
+
+	return iup.Vbox(
+		iup.Vbox(
+			addFiles,
+			addDir,
+			remove,
+			removeAll,
+		).SetAttribute("NGAP", "2"),
+		iup.Space().SetAttribute("SIZE", "x5"),
+		iup.Vbox(
+			thumbnail,
+			cover,
+		).SetAttribute("NGAP", "2"),
+		iup.Space().SetAttribute("SIZE", "x5"),
+		iup.Vbox(
+			convert,
+		),
+		iup.Fill(),
+		iup.Vbox(
+			iup.Label("Profile:"),
+			profile,
+			reset,
+			save,
+			command,
+		).SetAttribute("NGAP", "2"),
+	).SetHandle("Buttons").SetAttributes("ALIGNMENT=ACENTER")
+}
+
+func status() iup.Ihandle {
+	return iup.Hbox(
+		loading(),
+		iup.Fill(),
+		iup.Label("File 1 of 1").SetHandle("LabelStatus1").SetAttributes("VISIBLE=NO"),
+		iup.Space().SetAttribute("SIZE", "5"),
+		iup.Label("(000/000)").SetHandle("LabelStatus2").SetAttributes("VISIBLE=NO"),
+		iup.Space().SetAttribute("SIZE", "5"),
+		iup.ProgressBar().SetAttributes("VISIBLE=NO").SetHandle("ProgressBar").
+			SetCallback("POSTMESSAGE_CB", iup.PostMessageFunc(func(ih iup.Ihandle, s string, i int, p any) int {
+				switch s {
+				case "convert":
+					conv := p.(*cbconvert.Converter)
+					ih.SetAttributes("VALUE=0, VISIBLE=YES")
+					ih.SetAttribute("MAX", conv.Ncontents)
+
+					iup.GetHandle("LabelStatus1").SetAttribute("TITLE", fmt.Sprintf("File %d of %d", conv.CurrFile, conv.Nfiles))
+					iup.GetHandle("LabelStatus1").SetAttributes("VISIBLE=YES")
+					iup.GetHandle("LabelStatus2").SetAttributes("VISIBLE=YES")
+
+					iup.Refresh(iup.GetHandle("StatusBar"))
+				case "start":
+					conv := p.(*cbconvert.Converter)
+					ih.SetAttributes("VALUE=0, VISIBLE=YES")
+					ih.SetAttribute("MAX", conv.Nfiles)
+
+					iup.GetHandle("LabelStatus2").SetAttributes("VISIBLE=YES")
+				case "progress":
+					conv := p.(*cbconvert.Converter)
+					ih.SetAttribute("VALUE", conv.CurrContent)
+					iup.GetHandle("LabelStatus2").SetAttribute("TITLE", fmt.Sprintf("(%03d/%03d)", conv.CurrContent, conv.Ncontents))
+
+					iup.Refresh(iup.GetHandle("StatusBar"))
+				case "progress2":
+					conv := p.(*cbconvert.Converter)
+					ih.SetAttribute("VALUE", conv.CurrFile)
+					iup.GetHandle("LabelStatus2").SetAttribute("TITLE", fmt.Sprintf("(%03d/%03d)", conv.CurrFile, conv.Nfiles))
+
+					iup.Refresh(iup.GetHandle("StatusBar"))
+				case "finish":
+					setBusy(false)
+
+					iup.GetHandle("LabelStatus1").SetAttributes(`TITLE="", VISIBLE=NO`)
+					iup.GetHandle("LabelStatus2").SetAttributes(`TITLE="", VISIBLE=NO`)
+					ih.SetAttributes("VALUE=0, VISIBLE=NO")
+
+					iup.Refresh(iup.GetHandle("StatusBar"))
+
+					iup.GetHandle("dlg").SetCallback("K_ANY", nil)
+					iup.GetHandle("dlg").SetCallback("CLOSE_CB", nil)
+				}
+
+				return iup.DEFAULT
+			})),
+		iup.Space().SetAttribute("SIZE", "5x0"),
+	).SetAttributes("ALIGNMENT=ACENTER, NMARGIN=5x5").SetHandle("StatusBar")
+}
+
+func loading() iup.Ihandle {
+	img, _ := gif.DecodeAll(bytes.NewReader(appLoading))
+	animation := iup.User()
+
+	for idx, i := range img.Image {
+		name := fmt.Sprintf("Loading%d", idx)
+		iup.ImageFromImage(i).SetHandle(name)
+		iup.Append(animation, iup.GetHandle(name))
+	}
+
+	return iup.AnimatedLabel(animation).SetAttributes("VISIBLE=NO").SetHandle("Loading")
+}

cmd/cbconvert/go.mod

@@ -0,0 +1,60 @@
+module github.com/gen2brain/cbconvert/cmd/cbconvert
+
+go 1.26
+
+require (
+	github.com/gen2brain/cbconvert v1.0.5-0.20260623161611-a5817c3ba5de
+	github.com/schollz/progressbar/v3 v3.19.0
+	golang.org/x/term v0.44.0
+)
+
+require (
+	github.com/STARRY-S/zip v0.2.3 // indirect
+	github.com/andybalholm/brotli v1.2.1 // indirect
+	github.com/anthonynsimon/bild v0.15.0 // indirect
+	github.com/bodgit/plumbing v1.3.0 // indirect
+	github.com/bodgit/sevenzip v1.6.4 // indirect
+	github.com/bodgit/windows v1.0.1 // indirect
+	github.com/dsnet/compress v0.0.2-0.20230904184137-39efe44ab707 // indirect
+	github.com/dsoprea/go-exif/v2 v2.0.0-20230826092837-6579e82b732d // indirect
+	github.com/dsoprea/go-logging v0.0.0-20200710184922-b02d349568dd // indirect
+	github.com/dsoprea/go-png-image-structure v0.0.0-20210512210324-29b889a6093d // indirect
+	github.com/dsoprea/go-utility v0.0.0-20221003172846-a3e1774ef349 // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/ebitengine/purego v0.10.1 // indirect
+	github.com/fvbommel/sortorder v1.1.0 // indirect
+	github.com/gen2brain/avif v0.5.1 // indirect
+	github.com/gen2brain/go-fitz v1.24.15 // indirect
+	github.com/gen2brain/jpegli v0.4.0 // indirect
+	github.com/gen2brain/jpegxl v0.5.1 // indirect
+	github.com/gen2brain/webp v0.6.1 // indirect
+	github.com/go-errors/errors v1.5.1 // indirect
+	github.com/golang/geo v0.0.0-20260622181633-f80708c60e82 // indirect
+	github.com/hashicorp/golang-lru/v2 v2.0.7 // indirect
+	github.com/jsummers/gobmp v0.0.0-20230614200233-a9de23ed2e25 // indirect
+	github.com/jupiterrider/ffi v0.7.0 // indirect
+	github.com/klauspost/compress v1.18.6 // indirect
+	github.com/klauspost/pgzip v1.2.6 // indirect
+	github.com/mattn/go-runewidth v0.0.24 // indirect
+	github.com/mholt/archives v0.1.5 // indirect
+	github.com/mikelolasagasti/xz v1.0.1 // indirect
+	github.com/minio/minlz v1.1.1 // indirect
+	github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db // indirect
+	github.com/nwaples/rardecode/v2 v2.2.5 // indirect
+	github.com/pierrec/lz4/v4 v4.1.27 // indirect
+	github.com/rivo/uniseg v0.4.7 // indirect
+	github.com/sorairolake/lzip-go v0.3.8 // indirect
+	github.com/spf13/afero v1.15.0 // indirect
+	github.com/stangelandcl/ppmd v0.1.1 // indirect
+	github.com/tetratelabs/wazero v1.12.0 // indirect
+	github.com/ulikunitz/xz v0.5.15 // indirect
+	go4.org v0.0.0-20260112195520-a5071408f32f // indirect
+	golang.org/x/image v0.43.0 // indirect
+	golang.org/x/net v0.56.0 // indirect
+	golang.org/x/sync v0.21.0 // indirect
+	golang.org/x/sys v0.46.0 // indirect
+	golang.org/x/text v0.38.0 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+)
+
+replace github.com/gen2brain/cbconvert => ../..

cmd/cbconvert/go.sum

@@ -0,0 +1,155 @@
+github.com/STARRY-S/zip v0.2.3 h1:luE4dMvRPDOWQdeDdUxUoZkzUIpTccdKdhHHsQJ1fm4=
+github.com/STARRY-S/zip v0.2.3/go.mod h1:lqJ9JdeRipyOQJrYSOtpNAiaesFO6zVDsE8GIGFaoSk=
+github.com/andybalholm/brotli v1.2.1 h1:R+f5xP285VArJDRgowrfb9DqL18yVK0gKAW/F+eTWro=
+github.com/andybalholm/brotli v1.2.1/go.mod h1:rzTDkvFWvIrjDXZHkuS16NPggd91W3kUSvPlQ1pLaKY=
+github.com/anthonynsimon/bild v0.15.0 h1:FzvaNLuNlAPKw1Xz7V2WYOcGIEBMj8Y6ZyAk7CI+HzA=
+github.com/anthonynsimon/bild v0.15.0/go.mod h1:qIgJ9FldkCn0iy5Ad24fzUkz5R+iJ0WfhiV+6FeCB5A=
+github.com/bodgit/plumbing v1.3.0 h1:pf9Itz1JOQgn7vEOE7v7nlEfBykYqvUYioC61TwWCFU=
+github.com/bodgit/plumbing v1.3.0/go.mod h1:JOTb4XiRu5xfnmdnDJo6GmSbSbtSyufrsyZFByMtKEs=
+github.com/bodgit/sevenzip v1.6.4 h1:iHiVJfxbrB6RF4X+snI2MpVgNBKmVfGaTqZGNlMQIU0=
+github.com/bodgit/sevenzip v1.6.4/go.mod h1:ZtNi5KNgHXeXg1G7WiF0IWSuFE2eG6lt/cTGlvuirO0=
+github.com/bodgit/windows v1.0.1 h1:tF7K6KOluPYygXa3Z2594zxlkbKPAOvqr97etrGNIz4=
+github.com/bodgit/windows v1.0.1/go.mod h1:a6JLwrB4KrTR5hBpp8FI9/9W9jJfeQ2h4XDXU74ZCdM=
+github.com/chengxilo/virtualterm v1.0.4 h1:Z6IpERbRVlfB8WkOmtbHiDbBANU7cimRIof7mk9/PwM=
+github.com/chengxilo/virtualterm v1.0.4/go.mod h1:DyxxBZz/x1iqJjFxTFcr6/x+jSpqN0iwWCOK1q10rlY=
+github.com/clipperhouse/uax29/v2 v2.2.0 h1:ChwIKnQN3kcZteTXMgb1wztSgaU+ZemkgWdohwgs8tY=
+github.com/clipperhouse/uax29/v2 v2.2.0/go.mod h1:EFJ2TJMRUaplDxHKj1qAEhCtQPW2tJSwu5BF98AuoVM=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dsnet/compress v0.0.2-0.20230904184137-39efe44ab707 h1:2tV76y6Q9BB+NEBasnqvs7e49aEBFI8ejC89PSnWH+4=
+github.com/dsnet/compress v0.0.2-0.20230904184137-39efe44ab707/go.mod h1:qssHWj60/X5sZFNxpG4HBPDHVqxNm4DfnCKgrbZOT+s=
+github.com/dsnet/golib v0.0.0-20171103203638-1ea166775780/go.mod h1:Lj+Z9rebOhdfkVLjJ8T6VcRQv3SXugXy999NBtR9aFY=
+github.com/dsoprea/go-exif/v2 v2.0.0-20200321225314-640175a69fe4/go.mod h1:Lm2lMM2zx8p4a34ZemkaUV95AnMl4ZvLbCUbwOvLC2E=
+github.com/dsoprea/go-exif/v2 v2.0.0-20200604193436-ca8584a0e1c4/go.mod h1:9EXlPeHfblFFnwu5UOqmP2eoZfJyAZ2Ri/Vki33ajO0=
+github.com/dsoprea/go-exif/v2 v2.0.0-20230826092837-6579e82b732d h1:yeH8wrJa3+8uKKDAdURHUK1ds2UvKhMqX2MiOdVeKPs=
+github.com/dsoprea/go-exif/v2 v2.0.0-20230826092837-6579e82b732d/go.mod h1:oKrjk2kb3rAR5NbtSTLUMvMSbc+k8ZosI3MaVH47noc=
+github.com/dsoprea/go-exif/v3 v3.0.0-20200717053412-08f1b6708903/go.mod h1:0nsO1ce0mh5czxGeLo4+OCZ/C6Eo6ZlMWsz7rH/Gxv8=
+github.com/dsoprea/go-exif/v3 v3.0.0-20210512043655-120bcdb2a55e/go.mod h1:cg5SNYKHMmzxsr9X6ZeLh/nfBRHHp5PngtEPcujONtk=
+github.com/dsoprea/go-logging v0.0.0-20190624164917-c4f10aab7696/go.mod h1:Nm/x2ZUNRW6Fe5C3LxdY1PyZY5wmDv/s5dkPJ/VB3iA=
+github.com/dsoprea/go-logging v0.0.0-20200517223158-a10564966e9d/go.mod h1:7I+3Pe2o/YSU88W0hWlm9S22W7XI1JFNJ86U0zPKMf8=
+github.com/dsoprea/go-logging v0.0.0-20200710184922-b02d349568dd h1:l+vLbuxptsC6VQyQsfD7NnEC8BZuFpz45PgY+pH8YTg=
+github.com/dsoprea/go-logging v0.0.0-20200710184922-b02d349568dd/go.mod h1:7I+3Pe2o/YSU88W0hWlm9S22W7XI1JFNJ86U0zPKMf8=
+github.com/dsoprea/go-png-image-structure v0.0.0-20210512210324-29b889a6093d h1:8+qI8ant/vZkNSsbwSjIR6XJfWcDVTg/qx/3pRUUZNA=
+github.com/dsoprea/go-png-image-structure v0.0.0-20210512210324-29b889a6093d/go.mod h1:yTR3tKgyk20phAFg6IE9ulMA5NjEDD2wyx+okRFLVtw=
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+github.com/dsoprea/go-utility v0.0.0-20221003172846-a3e1774ef349 h1:/py11NlxDaOxkT9OKN+gXgT+QOH5xj1ZRoyusfRIlo4=
+github.com/dsoprea/go-utility v0.0.0-20221003172846-a3e1774ef349/go.mod h1:KVK+/Hul09ujXAGq+42UBgCTnXkiJZRnLYdURGjQUwo=
+github.com/dsoprea/go-utility/v2 v2.0.0-20200717064901-2fccff4aa15e/go.mod h1:uAzdkPTub5Y9yQwXe8W4m2XuP0tK4a9Q/dantD0+uaU=
+github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
+github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
+github.com/ebitengine/purego v0.10.1 h1:dewVBCBT2GaMu1SrNTYxQhgQBethzfhiwvZiLGP/qyY=
+github.com/ebitengine/purego v0.10.1/go.mod h1:iIjxzd6CiRiOG0UyXP+V1+jWqUXVjPKLAI0mRfJZTmQ=
+github.com/fvbommel/sortorder v1.1.0 h1:fUmoe+HLsBTctBDoaBwpQo5N+nrCp8g/BjKb/6ZQmYw=
+github.com/fvbommel/sortorder v1.1.0/go.mod h1:uk88iVf1ovNn1iLfgUVU2F9o5eO30ui720w+kxuqRs0=
+github.com/gen2brain/avif v0.5.1 h1:LQzLsJpWyGlsa4wuZ3D57qEbCiICIK7Yidz5ZPEwzTk=
+github.com/gen2brain/avif v0.5.1/go.mod h1:QgrYqdVE9y40PCfArK9VakcMIpYeDYpZmCSLkW6C1n8=
+github.com/gen2brain/go-fitz v1.24.15 h1:sJNB1MOWkqnzzENPHggFpgxTwW0+S5WF/rM5wUBpJWo=
+github.com/gen2brain/go-fitz v1.24.15/go.mod h1:SftkiVbTHqF141DuiLwBBM65zP7ig6AVDQpf2WlHamo=
+github.com/gen2brain/jpegli v0.4.0 h1:TnmAO8EcekS/XCboyLPjP6cqz025tkhdaFkiYNd3wH8=
+github.com/gen2brain/jpegli v0.4.0/go.mod h1:zJ++s4symmKCN1CLkrY0dGXTY3s0NWbd94Rz9KLdCzk=
+github.com/gen2brain/jpegxl v0.5.1 h1:UuBUIkZ35DErImU3bTA6rltfV5zSgVNOA/K5a6JibfE=
+github.com/gen2brain/jpegxl v0.5.1/go.mod h1:Wlc6lqx03RJfhiQRyHa2e+8VQwT4/qv7zSRsNv9T+yE=
+github.com/gen2brain/webp v0.6.1 h1:ei7Y1SWpQcdqz3YNDNyn4y2nQanxs9WLzwW5/2DKS64=
+github.com/gen2brain/webp v0.6.1/go.mod h1:iGWMaCSw7t3I/Cv9llzEKmpnR36S8lS8VL/ZVjxU0JE=
+github.com/go-errors/errors v1.0.1/go.mod h1:f4zRHt4oKfwPJE5k8C9vpYG+aDHdBFUsgrm6/TyX73Q=
+github.com/go-errors/errors v1.0.2/go.mod h1:psDX2osz5VnTOnFWbDeWwS7yejl+uV3FEWEp4lssFEs=
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cmd/cbconvert/main.go

@@ -0,0 +1,379 @@
+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"io"
+	"os"
+	"os/signal"
+	"path/filepath"
+	"runtime/debug"
+	"syscall"
+
+	"github.com/gen2brain/cbconvert"
+	pb "github.com/schollz/progressbar/v3"
+	"golang.org/x/term"
+)
+
+var appVersion string
+
+func init() {
+	if appVersion != "" {
+		return
+	}
+
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		return
+	}
+
+	if info.Main.Version != "" {
+		appVersion = info.Main.Version
+	}
+
+	for _, kv := range info.Settings {
+		if kv.Value == "" {
+			continue
+		}
+		if kv.Key == "vcs.revision" {
+			appVersion = kv.Value
+			if len(appVersion) > 10 {
+				appVersion = kv.Value[:10]
+			}
+		}
+	}
+}
+
+func main() {
+	opts, args := parseFlags()
+
+	if opts.Version {
+		fmt.Println(filepath.Base(os.Args[0]), appVersion)
+		os.Exit(0)
+	}
+
+	conv := cbconvert.New(opts)
+
+	c := make(chan os.Signal, 2)
+	signal.Notify(c, os.Interrupt, syscall.SIGTERM)
+	go func() {
+		for range c {
+			if err := os.RemoveAll(conv.Workdir); err != nil {
+				fmt.Println(err)
+			}
+			os.Exit(1)
+		}
+	}()
+
+	if _, err := os.Stat(opts.OutDir); err != nil {
+		if err := os.MkdirAll(opts.OutDir, 0775); err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+	}
+
+	files, err := conv.Files(args)
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+
+	interactive := !opts.Quiet && term.IsTerminal(int(os.Stderr.Fd()))
+
+	var bar *pb.ProgressBar
+	newBar := func(max int, description string) {
+		bar = pb.NewOptions(max,
+			pb.OptionShowCount(),
+			pb.OptionClearOnFinish(),
+			pb.OptionUseANSICodes(true),
+			pb.OptionSetPredictTime(false),
+			pb.OptionSetDescription(description),
+		)
+	}
+
+	clearLine := func() {
+		fmt.Fprint(os.Stderr, "\033[2K\r")
+	}
+
+	cleanup := func() {
+		if interactive {
+			if bar != nil {
+				_ = bar.Finish()
+			}
+			clearLine()
+		}
+	}
+
+	if interactive && (opts.Cover || opts.Thumbnail || opts.Meta) {
+		newBar(conv.Nfiles, "")
+	}
+
+	conv.OnStart = func() {
+		if interactive {
+			clearLine()
+			newBar(conv.Ncontents, fmt.Sprintf("Converting %d of %d:", conv.CurrFile, conv.Nfiles))
+		}
+	}
+
+	conv.OnProgress = func() {
+		if bar != nil {
+			_ = bar.Add(1)
+		}
+	}
+
+	conv.OnCompress = func() {
+		if interactive {
+			if bar != nil {
+				_ = bar.Finish()
+			}
+			fmt.Fprintf(os.Stderr, "Compressing %d of %d...", conv.CurrFile, conv.Nfiles)
+		}
+	}
+
+	if opts.Combine {
+		if err := conv.Combine(files); err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+
+		cleanup()
+
+		return
+	}
+
+	for _, file := range files {
+		switch {
+		case opts.Meta:
+			ret, err := conv.Meta(file.Path)
+			if err != nil {
+				fmt.Println(err)
+				os.Exit(1)
+			}
+
+			if opts.Cover {
+				fmt.Println(ret)
+			} else if opts.Comment {
+				fmt.Println(ret)
+			}
+
+			continue
+		case opts.Cover:
+			if err := conv.Cover(file); err != nil {
+				fmt.Println(err)
+				os.Exit(1)
+			}
+
+			continue
+		case opts.Thumbnail:
+			if err = conv.Thumbnail(file); err != nil {
+				fmt.Println(err)
+				os.Exit(1)
+			}
+
+			continue
+		}
+
+		if err := conv.Convert(file); err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+	}
+
+	cleanup()
+}
+
+// parseFlags parses command line flags.
+func parseFlags() (cbconvert.Options, []string) {
+	opts := cbconvert.Options{}
+	var args []string
+
+	convert := flag.NewFlagSet("convert", flag.ExitOnError)
+	convert.IntVar(&opts.Width, "width", 0, "Image width")
+	convert.IntVar(&opts.Height, "height", 0, "Image height")
+	convert.BoolVar(&opts.Fit, "fit", false, "Best fit for required width and height")
+	convert.BoolVar(&opts.NoUpscale, "no-upscale", false, "Do not upscale images already smaller than the requested width/height")
+	convert.IntVar(&opts.DPI, "dpi", 0, "Document rendering resolution in DPI (PDF, EPUB, etc.), 0 uses the default (300)")
+	convert.StringVar(&opts.Format, "format", "jpeg", "Image format, valid values are jpeg, png, tiff, bmp, webp, avif, jxl")
+	convert.StringVar(&opts.Archive, "archive", "zip", "Archive format, valid values are zip, tar")
+	convert.IntVar(&opts.ZipLevel, "zip-level", -1, "ZIP compression level, 0 disables compression, 1-9 sets deflate level (1 fastest, 9 smallest), -1 uses the default")
+	convert.IntVar(&opts.Quality, "quality", 75, "Image quality")
+	convert.IntVar(&opts.Effort, "effort", -1, "Encoder speed/effort, format-specific (webp method 0-6, avif speed 0-10, jxl effort 1-10), -1 uses the format default")
+	convert.BoolVar(&opts.Lossless, "lossless", false, "Lossless compression (webp, avif, jxl), ignores quality")
+	convert.BoolVar(&opts.Combine, "combine", false, "Combine all inputs into a single archive")
+	convert.StringVar(&opts.OutFile, "outfile", "", "Output file name for --combine (default: first input + -combined)")
+	convert.IntVar(&opts.Filter, "filter", 2, "0=NearestNeighbor, 1=Box, 2=Linear, 3=MitchellNetravali, 4=CatmullRom, 6=Gaussian, 7=Lanczos")
+	convert.BoolVar(&opts.NoCover, "no-cover", false, "Do not convert the cover image")
+	convert.BoolVar(&opts.NoRGB, "no-rgb", false, "Do not convert images that have RGB colorspace")
+	convert.BoolVar(&opts.NoNonImage, "no-nonimage", false, "Remove non-image files from the archive")
+	convert.BoolVar(&opts.NoConvert, "no-convert", false, "Do not transform or convert images")
+	convert.BoolVar(&opts.Grayscale, "grayscale", false, "Convert images to grayscale (monochromatic)")
+	convert.IntVar(&opts.Rotate, "rotate", 0, "Rotate images, valid values are 0, 90, 180, 270")
+	convert.IntVar(&opts.Brightness, "brightness", 0, "Adjust the brightness of the images, must be in the range (-100, 100)")
+	convert.IntVar(&opts.Contrast, "contrast", 0, "Adjust the contrast of the images, must be in the range (-100, 100)")
+	convert.StringVar(&opts.Suffix, "suffix", "", "Add suffix to file basename")
+	convert.StringVar(&opts.OutDir, "outdir", ".", "Output directory")
+	convert.IntVar(&opts.Size, "size", 0, "Process only files larger than size (in MB)")
+	convert.BoolVar(&opts.Recursive, "recursive", false, "Process subdirectories recursively")
+	convert.BoolVar(&opts.Quiet, "quiet", false, "Hide console output")
+
+	cover := flag.NewFlagSet("cover", flag.ExitOnError)
+	cover.IntVar(&opts.Width, "width", 0, "Image width")
+	cover.IntVar(&opts.Height, "height", 0, "Image height")
+	cover.BoolVar(&opts.Fit, "fit", false, "Best fit for required width and height")
+	cover.BoolVar(&opts.NoUpscale, "no-upscale", false, "Do not upscale images already smaller than the requested width/height")
+	cover.IntVar(&opts.DPI, "dpi", 0, "Document rendering resolution in DPI (PDF, EPUB, etc.), 0 uses the default (300)")
+	cover.StringVar(&opts.Format, "format", "jpeg", "Image format, valid values are jpeg, png, tiff, bmp, webp, avif")
+	cover.IntVar(&opts.Quality, "quality", 75, "Image quality")
+	cover.IntVar(&opts.Effort, "effort", -1, "Encoder speed/effort, format-specific (webp method 0-6, avif speed 0-10, jxl effort 1-10), -1 uses the format default")
+	cover.BoolVar(&opts.Lossless, "lossless", false, "Lossless compression (webp, avif, jxl), ignores quality")
+	cover.IntVar(&opts.Filter, "filter", 2, "0=NearestNeighbor, 1=Box, 2=Linear, 3=MitchellNetravali, 4=CatmullRom, 6=Gaussian, 7=Lanczos")
+	cover.StringVar(&opts.OutDir, "outdir", ".", "Output directory")
+	cover.IntVar(&opts.Size, "size", 0, "Process only files larger than size (in MB)")
+	cover.BoolVar(&opts.Recursive, "recursive", false, "Process subdirectories recursively")
+	cover.BoolVar(&opts.Quiet, "quiet", false, "Hide console output")
+
+	thumbnail := flag.NewFlagSet("thumbnail", flag.ExitOnError)
+	thumbnail.IntVar(&opts.Width, "width", 0, "Image width")
+	thumbnail.IntVar(&opts.Height, "height", 0, "Image height")
+	thumbnail.BoolVar(&opts.Fit, "fit", false, "Best fit for required width and height")
+	thumbnail.BoolVar(&opts.NoUpscale, "no-upscale", false, "Do not upscale images already smaller than the requested width/height")
+	thumbnail.IntVar(&opts.DPI, "dpi", 0, "Document rendering resolution in DPI (PDF, EPUB, etc.), 0 uses the default (300)")
+	thumbnail.IntVar(&opts.Filter, "filter", 2, "0=NearestNeighbor, 1=Box, 2=Linear, 3=MitchellNetravali, 4=CatmullRom, 6=Gaussian, 7=Lanczos")
+	thumbnail.StringVar(&opts.OutDir, "outdir", ".", "Output directory")
+	thumbnail.StringVar(&opts.OutFile, "outfile", "", "Output file")
+	thumbnail.IntVar(&opts.Size, "size", 0, "Process only files larger than size (in MB)")
+	thumbnail.BoolVar(&opts.Recursive, "recursive", false, "Process subdirectories recursively")
+	thumbnail.BoolVar(&opts.Quiet, "quiet", false, "Hide console output")
+
+	meta := flag.NewFlagSet("meta", flag.ExitOnError)
+	meta.BoolVar(&opts.Cover, "cover", false, "Print cover name")
+	meta.BoolVar(&opts.Comment, "comment", false, "Print zip comment")
+	meta.StringVar(&opts.CommentBody, "comment-body", "", "Set zip comment")
+	meta.StringVar(&opts.FileAdd, "file-add", "", "Add file to archive")
+	meta.StringVar(&opts.FileRemove, "file-remove", "", "Remove file from archive (glob pattern, i.e. *.xml)")
+
+	flag.NewFlagSet("version", flag.ExitOnError)
+
+	flag.Usage = func() {
+		fmt.Fprintf(os.Stderr, "Usage: %s <command> [<flags>] [file1 dir1 ... fileOrDirN]\n\n", filepath.Base(os.Args[0]))
+		fmt.Fprintf(os.Stderr, "\nCommands:\n")
+		fmt.Fprintf(os.Stderr, "\n  convert\n    \tConvert archive or document\n\n")
+		order := []string{"width", "height", "fit", "no-upscale", "dpi", "format", "archive", "zip-level", "quality", "effort", "lossless", "combine", "outfile", "filter", "no-cover", "no-rgb",
+			"no-nonimage", "no-convert", "grayscale", "rotate", "brightness", "contrast", "suffix", "outdir", "size", "recursive", "quiet"}
+		for _, name := range order {
+			f := convert.Lookup(name)
+			fmt.Fprintf(os.Stderr, "    --%s\n    \t", f.Name)
+			fmt.Fprintf(os.Stderr, "%v (default %q)\n", f.Usage, f.DefValue)
+		}
+		fmt.Fprintf(os.Stderr, "\n  cover\n    \tExtract cover\n\n")
+		order = []string{"width", "height", "fit", "no-upscale", "dpi", "format", "quality", "effort", "lossless", "filter", "outdir", "size", "recursive", "quiet"}
+		for _, name := range order {
+			f := cover.Lookup(name)
+			fmt.Fprintf(os.Stderr, "    --%s\n    \t", f.Name)
+			fmt.Fprintf(os.Stderr, "%v (default %q)\n", f.Usage, f.DefValue)
+		}
+		fmt.Fprintf(os.Stderr, "\n  thumbnail\n    \tExtract cover thumbnail (freedesktop spec.)\n\n")
+		order = []string{"width", "height", "fit", "no-upscale", "dpi", "filter", "outdir", "outfile", "size", "recursive", "quiet"}
+		for _, name := range order {
+			f := thumbnail.Lookup(name)
+			fmt.Fprintf(os.Stderr, "    --%s\n    \t", f.Name)
+			fmt.Fprintf(os.Stderr, "%v (default %q)\n", f.Usage, f.DefValue)
+		}
+		fmt.Fprintf(os.Stderr, "\n  meta\n    \tCBZ metadata\n\n")
+		order = []string{"cover", "comment", "comment-body", "file-add", "file-remove"}
+		for _, name := range order {
+			f := meta.Lookup(name)
+			fmt.Fprintf(os.Stderr, "    --%s\n    \t", f.Name)
+			fmt.Fprintf(os.Stderr, "%v (default %q)\n", f.Usage, f.DefValue)
+		}
+		fmt.Fprintf(os.Stderr, "\n  version\n    \tPrint version\n\n")
+	}
+
+	if len(os.Args) < 2 {
+		flag.Usage()
+		fmt.Fprintf(os.Stderr, "no command\n")
+		os.Exit(1)
+	}
+
+	pipe := piped()
+	if pipe {
+		args = lines(os.Stdin)
+	}
+
+	switch os.Args[1] {
+	case "convert":
+		operands := parseArgs(convert, os.Args[2:])
+		if !pipe {
+			args = operands
+		}
+	case "cover":
+		opts.Cover = true
+		operands := parseArgs(cover, os.Args[2:])
+		if !pipe {
+			args = operands
+		}
+	case "thumbnail":
+		opts.Thumbnail = true
+		operands := parseArgs(thumbnail, os.Args[2:])
+		if !pipe {
+			args = operands
+		}
+	case "meta":
+		opts.Meta = true
+		operands := parseArgs(meta, os.Args[2:])
+		if !pipe {
+			args = operands
+		}
+	case "version":
+		opts.Version = true
+	}
+
+	if len(args) == 0 && !opts.Version {
+		flag.Usage()
+		_, _ = fmt.Fprintf(os.Stderr, "no arguments\n")
+		os.Exit(1)
+	}
+
+	return opts, args
+}
+
+// parseArgs parses flags interspersed with file/dir operands.
+func parseArgs(fs *flag.FlagSet, args []string) []string {
+	var operands []string
+
+	_ = fs.Parse(args)
+	for fs.NArg() > 0 {
+		operands = append(operands, fs.Arg(0))
+		_ = fs.Parse(fs.Args()[1:])
+	}
+
+	return operands
+}
+
+// piped checks if we have piped stdin.
+func piped() bool {
+	f, err := os.Stdin.Stat()
+	if err != nil {
+		return false
+	}
+
+	if f.Mode()&os.ModeNamedPipe == 0 {
+		return false
+	}
+
+	return true
+}
+
+// lines returns slice of lines from the reader.
+func lines(r io.Reader) []string {
+	data := make([]string, 0)
+	scanner := bufio.NewScanner(r)
+
+	for scanner.Scan() {
+		text := scanner.Text()
+		data = append(data, text)
+	}
+
+	return data
+}

go.mod

@@ -0,0 +1,52 @@
+module github.com/gen2brain/cbconvert
+
+go 1.26
+
+require (
+	github.com/anthonynsimon/bild v0.15.0
+	github.com/dsoprea/go-png-image-structure v0.0.0-20210512210324-29b889a6093d
+	github.com/dustin/go-humanize v1.0.1
+	github.com/fvbommel/sortorder v1.1.0
+	github.com/gen2brain/avif v0.5.1
+	github.com/gen2brain/go-fitz v1.24.15
+	github.com/gen2brain/jpegli v0.4.0
+	github.com/gen2brain/jpegxl v0.5.1
+	github.com/gen2brain/webp v0.6.1
+	github.com/jsummers/gobmp v0.0.0-20230614200233-a9de23ed2e25
+	github.com/mholt/archives v0.1.5
+	golang.org/x/image v0.43.0
+	golang.org/x/sync v0.21.0
+)
+
+require (
+	github.com/STARRY-S/zip v0.2.3 // indirect
+	github.com/andybalholm/brotli v1.2.1 // indirect
+	github.com/bodgit/plumbing v1.3.0 // indirect
+	github.com/bodgit/sevenzip v1.6.4 // indirect
+	github.com/bodgit/windows v1.0.1 // indirect
+	github.com/dsnet/compress v0.0.2-0.20230904184137-39efe44ab707 // indirect
+	github.com/dsoprea/go-exif/v2 v2.0.0-20230826092837-6579e82b732d // indirect
+	github.com/dsoprea/go-logging v0.0.0-20200710184922-b02d349568dd // indirect
+	github.com/dsoprea/go-utility v0.0.0-20221003172846-a3e1774ef349 // indirect
+	github.com/ebitengine/purego v0.10.1 // indirect
+	github.com/go-errors/errors v1.5.1 // indirect
+	github.com/golang/geo v0.0.0-20260622181633-f80708c60e82 // indirect
+	github.com/hashicorp/golang-lru/v2 v2.0.7 // indirect
+	github.com/jupiterrider/ffi v0.7.0 // indirect
+	github.com/klauspost/compress v1.18.6 // indirect
+	github.com/klauspost/pgzip v1.2.6 // indirect
+	github.com/mikelolasagasti/xz v1.0.1 // indirect
+	github.com/minio/minlz v1.1.1 // indirect
+	github.com/nwaples/rardecode/v2 v2.2.5 // indirect
+	github.com/pierrec/lz4/v4 v4.1.27 // indirect
+	github.com/sorairolake/lzip-go v0.3.8 // indirect
+	github.com/spf13/afero v1.15.0 // indirect
+	github.com/stangelandcl/ppmd v0.1.1 // indirect
+	github.com/tetratelabs/wazero v1.12.0 // indirect
+	github.com/ulikunitz/xz v0.5.15 // indirect
+	go4.org v0.0.0-20260112195520-a5071408f32f // indirect
+	golang.org/x/net v0.56.0 // indirect
+	golang.org/x/sys v0.46.0 // indirect
+	golang.org/x/text v0.38.0 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+)

go.sum

@@ -0,0 +1,141 @@
+github.com/STARRY-S/zip v0.2.3 h1:luE4dMvRPDOWQdeDdUxUoZkzUIpTccdKdhHHsQJ1fm4=
+github.com/STARRY-S/zip v0.2.3/go.mod h1:lqJ9JdeRipyOQJrYSOtpNAiaesFO6zVDsE8GIGFaoSk=
+github.com/andybalholm/brotli v1.2.1 h1:R+f5xP285VArJDRgowrfb9DqL18yVK0gKAW/F+eTWro=
+github.com/andybalholm/brotli v1.2.1/go.mod h1:rzTDkvFWvIrjDXZHkuS16NPggd91W3kUSvPlQ1pLaKY=
+github.com/anthonynsimon/bild v0.15.0 h1:FzvaNLuNlAPKw1Xz7V2WYOcGIEBMj8Y6ZyAk7CI+HzA=
+github.com/anthonynsimon/bild v0.15.0/go.mod h1:qIgJ9FldkCn0iy5Ad24fzUkz5R+iJ0WfhiV+6FeCB5A=
+github.com/bodgit/plumbing v1.3.0 h1:pf9Itz1JOQgn7vEOE7v7nlEfBykYqvUYioC61TwWCFU=
+github.com/bodgit/plumbing v1.3.0/go.mod h1:JOTb4XiRu5xfnmdnDJo6GmSbSbtSyufrsyZFByMtKEs=
+github.com/bodgit/sevenzip v1.6.4 h1:iHiVJfxbrB6RF4X+snI2MpVgNBKmVfGaTqZGNlMQIU0=
+github.com/bodgit/sevenzip v1.6.4/go.mod h1:ZtNi5KNgHXeXg1G7WiF0IWSuFE2eG6lt/cTGlvuirO0=
+github.com/bodgit/windows v1.0.1 h1:tF7K6KOluPYygXa3Z2594zxlkbKPAOvqr97etrGNIz4=
+github.com/bodgit/windows v1.0.1/go.mod h1:a6JLwrB4KrTR5hBpp8FI9/9W9jJfeQ2h4XDXU74ZCdM=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dsnet/compress v0.0.2-0.20230904184137-39efe44ab707 h1:2tV76y6Q9BB+NEBasnqvs7e49aEBFI8ejC89PSnWH+4=
+github.com/dsnet/compress v0.0.2-0.20230904184137-39efe44ab707/go.mod h1:qssHWj60/X5sZFNxpG4HBPDHVqxNm4DfnCKgrbZOT+s=
+github.com/dsnet/golib v0.0.0-20171103203638-1ea166775780/go.mod h1:Lj+Z9rebOhdfkVLjJ8T6VcRQv3SXugXy999NBtR9aFY=
+github.com/dsoprea/go-exif/v2 v2.0.0-20200321225314-640175a69fe4/go.mod h1:Lm2lMM2zx8p4a34ZemkaUV95AnMl4ZvLbCUbwOvLC2E=
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+github.com/dsoprea/go-exif/v2 v2.0.0-20230826092837-6579e82b732d/go.mod h1:oKrjk2kb3rAR5NbtSTLUMvMSbc+k8ZosI3MaVH47noc=
+github.com/dsoprea/go-exif/v3 v3.0.0-20200717053412-08f1b6708903/go.mod h1:0nsO1ce0mh5czxGeLo4+OCZ/C6Eo6ZlMWsz7rH/Gxv8=
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make.bash

@@ -1,21 +0,0 @@
-#!/usr/bin/env bash
-
-mkdir -p build
-
-CGO_ENABLED=1 GOOS=linux GOARCH=amd64 go build -o build/cbconvert
-strip build/cbconvert
-
-#CGO_LDFLAGS="-lm -lz -ldl -lltdl -lfreetype -static-libgcc" CGO_ENABLED=1 GOOS=linux GOARCH=amd64 go build -v -x -o build/cbconvert-static --ldflags '-extldflags "-static"'
-#strip build/cbconvert-static
-
-CGO_LDFLAGS="-L/usr/i686-pc-mingw32/usr/lib" \
-CGO_CFLAGS="-I/usr/i686-pc-mingw32/usr/include -Wno-poison-system-directories" \
-CGO_CXXFLAGS="-I/usr/i686-pc-mingw32/usr/include -Wno-poison-system-directories" \
-CGO_CPPFLAGS="-I/usr/i686-pc-mingw32/usr/include -Wno-poison-system-directories" \
-PKG_CONFIG=/usr/bin/i686-pc-mingw32-pkg-config \
-PKG_CONFIG_PATH=/usr/i686-pc-mingw32/usr/lib/pkgconfig \
-PKG_CONFIG_LIBDIR=/usr/i686-pc-mingw32/usr/lib/pkgconfig \
-CC="i686-pc-mingw32-gcc" CXX="i686-pc-mingw32-g++" \
-CC_FOR_TARGET=i686-pc-mingw32-gcc CXX_FOR_TARGET=i686-pc-mingw32-g++ \
-CGO_ENABLED=1 GOOS=windows GOARCH=386 go build -o build/cbconvert.exe -ldflags "-linkmode external -extldflags -static"
-i686-pc-mingw32-strip build/cbconvert.exe