feat: enhance logging capabilities with zerolog integration and command-line support

README.md

@@ -15,18 +15,18 @@ CBZOptimizer is a Go-based tool designed to optimize CBZ (Comic Book Zip) and CB
 
 ## Installation
 
-1. Clone the repository:
+### Download Binary
+
+Download the latest release from [GitHub Releases](https://github.com/belphemur/CBZOptimizer/releases).
+
+### Docker
+
+Pull the Docker image:
 
 ```sh
-git clone https://github.com/belphemur/CBZOptimizer.git
+docker pull ghcr.io/belphemur/cbzoptimizer:latest
-cd CBZOptimizer
 ```
 
-2. Install dependencies:
-   ```sh
-   go mod tidy
-   ```
-
 ## Usage
 
 ### Command Line Interface
@@ -38,7 +38,13 @@ The tool provides CLI commands to optimize and watch CBZ/CBR files. Below are ex
 Optimize all CBZ/CBR files in a folder recursively:
 
 ```sh
-go run main.go optimize [folder] --quality 85 --parallelism 2 --override --format webp --split
+cbzconverter optimize [folder] --quality 85 --parallelism 2 --override --format webp --split
+```
+
+Or with Docker:
+
+```sh
+docker run -v /path/to/comics:/comics ghcr.io/belphemur/cbzoptimizer:latest optimize /comics --quality 85 --parallelism 2 --override --format webp --split
 ```
 
 #### Watch Command
@@ -46,7 +52,13 @@ go run main.go optimize [folder] --quality 85 --parallelism 2 --override --forma
 Watch a folder for new CBZ/CBR files and optimize them automatically:
 
 ```sh
-go run main.go watch [folder] --quality 85 --override --format webp --split
+cbzconverter watch [folder] --quality 85 --override --format webp --split
+```
+
+Or with Docker:
+
+```sh
+docker run -v /path/to/comics:/comics ghcr.io/belphemur/cbzoptimizer:latest watch /comics --quality 85 --override --format webp --split
 ```
 
 ### Flags
@@ -56,34 +68,90 @@ go run main.go watch [folder] --quality 85 --override --format webp --split
 - `--override`, `-o`: Override the original files. For CBZ files, overwrites the original. For CBR files, deletes the original CBR and creates a new CBZ. Default is false.
 - `--split`, `-s`: Split long pages into smaller chunks. Default is false.
 - `--format`, `-f`: Format to convert the images to (e.g., webp). Default is webp.
+- `--log`, `-l`: Set log level; can be 'panic', 'fatal', 'error', 'warn', 'info', 'debug', or 'trace'. Default is info.
 
-## Testing
+## Logging
 
-To run the tests, use the following command:
+CBZOptimizer uses structured logging with [zerolog](https://github.com/rs/zerolog) for consistent and performant logging output.
+
+### Log Levels
+
+You can control the verbosity of logging using either command-line flags or environment variables:
+
+**Command Line:**
 
 ```sh
-go test ./... -v
+# Set log level to debug for detailed output
+cbzconverter --log debug optimize [folder]
+
+# Set log level to error for minimal output
+cbzconverter --log error optimize [folder]
 ```
 
-## Requirement
+**Environment Variable:**
 
-Needs to have libwep installed on the machine if you're not using the docker image
+```sh
+# Set log level via environment variable
+LOG_LEVEL=debug cbzconverter optimize [folder]
+```
 
-## Docker
+**Docker:**
 
-`ghcr.io/belphemur/cbzoptimizer:latest`
+```sh
+# Set log level via environment variable in Docker
+docker run -e LOG_LEVEL=debug -v /path/to/comics:/comics ghcr.io/belphemur/cbzoptimizer:latest optimize /comics
+```
 
-## GitHub Actions
+### Available Log Levels
 
-The project includes a GitHub Actions workflow to run tests on every push and pull request to the `main` branch. The workflow is defined in `.github/workflows/go.yml`.
+- `panic`: Logs panic level messages and above
+- `fatal`: Logs fatal level messages and above
+- `error`: Logs error level messages and above
+- `warn`: Logs warning level messages and above
+- `info`: Logs info level messages and above (default)
+- `debug`: Logs debug level messages and above
+- `trace`: Logs all messages including trace level
 
-## Contributing
+### Examples
 
-1. Fork the repository.
+```sh
-2. Create a new branch (`git checkout -b feature-branch`).
+# Default info level logging
-3. Commit your changes (`git commit -am 'Add new feature'`).
+cbzconverter optimize comics/
-4. Push to the branch (`git push origin feature-branch`).
+
-5. Create a new Pull Request.
+# Debug level for troubleshooting
+cbzconverter --log debug optimize comics/
+
+# Quiet operation (only errors and above)
+cbzconverter --log error optimize comics/
+
+# Using environment variable
+LOG_LEVEL=warn cbzconverter optimize comics/
+
+# Docker with debug logging
+docker run -e LOG_LEVEL=debug -v /path/to/comics:/comics ghcr.io/belphemur/cbzoptimizer:latest optimize /comics
+```
+
+## Requirements
+
+- For Docker usage: No additional requirements needed
+- For binary usage: Needs `libwebp` installed on the system for WebP conversion
+
+## Docker Image
+
+The official Docker image is available at: `ghcr.io/belphemur/cbzoptimizer:latest`
+
+## Troubleshooting
+
+If you encounter issues:
+
+1. Use `--log debug` for detailed logging output
+2. Check that all required dependencies are installed
+3. Ensure proper file permissions for input/output directories
+4. For Docker usage, verify volume mounts are correct
+
+## Support
+
+For issues and questions, please use [GitHub Issues](https://github.com/belphemur/CBZOptimizer/issues).
 
 ## License
 

cmd/cbzoptimizer/commands/rootcmd.go

@@ -2,14 +2,31 @@ package commands
 
 import (
 	"fmt"
-	"github.com/rs/zerolog/log"
-	"github.com/spf13/cobra"
-	"github.com/spf13/viper"
 	"os"
 	"path/filepath"
 	"runtime"
+
+	"github.com/rs/zerolog"
+	"github.com/rs/zerolog/log"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+	"github.com/thediveo/enumflag/v2"
 )
 
+// Map zerolog levels to their textual representations
+var LogLevelIds = map[zerolog.Level][]string{
+	zerolog.PanicLevel: {"panic"},
+	zerolog.FatalLevel: {"fatal"},
+	zerolog.ErrorLevel: {"error"},
+	zerolog.WarnLevel:  {"warn", "warning"},
+	zerolog.InfoLevel:  {"info"},
+	zerolog.DebugLevel: {"debug"},
+	zerolog.TraceLevel: {"trace"},
+}
+
+// Global log level variable with default
+var logLevel zerolog.Level = zerolog.InfoLevel
+
 var rootCmd = &cobra.Command{
 	Use:   "cbzconverter",
 	Short: "Convert CBZ files using a specified converter",
@@ -35,6 +52,17 @@ func init() {
 	viper.AddConfigPath(configFolder)
 	viper.SetEnvPrefix("CBZ")
 	viper.AutomaticEnv()
+
+	// Add log level flag (accepts zerolog levels: panic, fatal, error, warn, info, debug, trace)
+	rootCmd.PersistentFlags().VarP(
+		enumflag.New(&logLevel, "log", LogLevelIds, enumflag.EnumCaseInsensitive),
+		"log", "l",
+		"Set log level; can be 'panic', 'fatal', 'error', 'warn', 'info', 'debug', or 'trace'")
+
+	// Add log level environment variable support
+	viper.SetEnvPrefix("")
+	viper.BindEnv("LOG_LEVEL")
+
 	err := os.MkdirAll(configFolder, os.ModePerm)
 	if err != nil {
 		panic(fmt.Errorf("fatal error config file: %w", err))
@@ -60,3 +88,32 @@ func Execute() {
 func AddCommand(cmd *cobra.Command) {
 	rootCmd.AddCommand(cmd)
 }
+
+// ConfigureLogging sets up zerolog based on command-line flags and environment variables
+func ConfigureLogging() {
+	// Start with default log level (info)
+	level := zerolog.InfoLevel
+
+	// Check LOG_LEVEL environment variable first
+	envLogLevel := viper.GetString("LOG_LEVEL")
+	if envLogLevel != "" {
+		if parsedLevel, err := zerolog.ParseLevel(envLogLevel); err == nil {
+			level = parsedLevel
+		}
+	}
+
+	// Command-line log flag takes precedence over environment variable
+	// The logLevel variable will be set by the flag parsing, so if it's different from default, use it
+	if logLevel != zerolog.InfoLevel {
+		level = logLevel
+	}
+
+	// Set the global log level
+	zerolog.SetGlobalLevel(level)
+
+	// Configure console writer for readable output
+	log.Logger = log.Output(zerolog.ConsoleWriter{
+		Out:     os.Stderr,
+		NoColor: false,
+	})
+}

cmd/cbzoptimizer/main.go

@@ -2,9 +2,6 @@ package main
 
 import (
 	"github.com/belphemur/CBZOptimizer/v2/cmd/cbzoptimizer/commands"
-	"github.com/rs/zerolog"
-	"github.com/rs/zerolog/log"
-	"os"
 )
 
 var (
@@ -14,10 +11,10 @@ var (
 )
 
 func main() {
-	// Configure zerolog
-	zerolog.TimeFieldFormat = zerolog.TimeFormatUnix
-	log.Logger = log.Output(zerolog.ConsoleWriter{Out: os.Stderr})
-
 	commands.SetVersionInfo(version, commit, date)
+
+	// Configure logging before executing commands
+	commands.ConfigureLogging()
+
 	commands.Execute()
 }