Add support for adding/removing files

README.md

@@ -158,9 +158,13 @@ This is what it looks like in the PCManFM file manager:
         --cover
             Print cover name (default "false")
         --comment
-    	    Print zip comment (default "false")
+            Print zip comment (default "false")
         --comment-body
-    	    Set zip comment (default "")
+            Set zip comment (default "")
+        --file-add
+            Add file to archive (default "")
+        --file-remove
+            Remove file(s) from archive (glob pattern, i.e. *.xml) (default "")
 
 ```
 

cbconvert.go

@@ -104,6 +104,10 @@ type Options struct {
 	Comment bool
 	// ZIP comment body
 	CommentBody string
+	// Add file
+	FileAdd string
+	// Remove file
+	FileRemove string
 	// Output file
 	Outfile string
 	// Output directory
@@ -980,6 +984,165 @@ func (c *Convertor) archiveSetComment(fileName, commentBody string) error {
 	return nil
 }
 
+// archiveFileAdd adds file to archive.
+func (c *Convertor) 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 *Convertor) 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
+}
+
 // coverArchive extracts cover from archive.
 func (c *Convertor) coverArchive(fileName string) (image.Image, error) {
 	var images []string
@@ -1560,6 +1723,16 @@ func (c *Convertor) Meta(fileName string) (any, error) {
 		if err != nil {
 			return nil, fmt.Errorf("%s: %w", fileName, err)
 		}
+	case c.Opts.FileAdd != "":
+		err := c.archiveFileAdd(fileName, c.Opts.FileAdd)
+		if err != nil {
+			return nil, fmt.Errorf("%s: %w", fileName, err)
+		}
+	case c.Opts.FileRemove != "":
+		err := c.archiveFileRemove(fileName, c.Opts.FileRemove)
+		if err != nil {
+			return nil, fmt.Errorf("%s: %w", fileName, err)
+		}
 	}
 
 	return "", nil

cmd/cbconvert/main.go

@@ -194,6 +194,8 @@ func parseFlags() (cbconvert.Options, []string) {
 	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)")
 
 	convert.Usage = func() {
 		_, _ = fmt.Fprintf(os.Stderr, "Usage: %s <command> [<flags>] [file1 dir1 ... fileOrDirN]\n\n", filepath.Base(os.Args[0]))

go.work

@@ -1,6 +0,0 @@
-go 1.21.0
-
-use (
-	.
-	./cmd/cbconvert
-)