Add screenshot

Makefile

@@ -27,6 +27,7 @@ clean:
 	@echo "Cleaning build artifacts..."
 	rm -f s3-genindex
 	rm -f coverage.out coverage.html
+	find . -name index.html -delete
 	@echo "Clean complete"
 
 # Wipe everything including test caches
@@ -86,4 +87,4 @@ help:
 	@echo "  lint          - Lint code (requires golangci-lint)"
 	@echo "  check         - Run fmt, vet, lint, and test"
 	@echo "  bench         - Run benchmarks"
-	@echo "  help          - Show this help message"
+	@echo "  help          - Show this help message"

README.md

@@ -1,6 +1,19 @@
 # s3-genindex
 
-Generate HTML directory indexes with file type icons and responsive design.
+Generate HTML directory indexes with file type icons and responsive design for local directories and S3-compatible storage.
+This is particularly useful for S3 buckets that are publicly readable.
+
+![Screenshot](docs/screenshot.png)
+
+## Features
+
+- **Local directory indexing** with recursive traversal
+- **S3-compatible storage support** (MinIO, AWS S3, etc.)
+- **Hierarchical directory structure** for S3 buckets
+- **Responsive HTML design** with file type icons
+- **Dry run mode** for testing
+- **Flexible filtering** with glob patterns and regex exclusion
+- **Hidden file control** and index.html visibility options
 
 ## Install
 
@@ -8,17 +21,20 @@ Generate HTML directory indexes with file type icons and responsive design.
 go install git.ipng.ch/ipng/s3-genindex/cmd/s3-genindex@latest
 ```
 
-## Usage
+## Quick Start
 
 ```bash
-# Generate index.html in current directory
+# Local directory
-s3-genindex
+s3-genindex -d /path/to/dir
 
-# Generate recursively with custom output
+# S3 bucket (requires AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY)
-s3-genindex -r -o listing.html /path/to/dir
+s3-genindex -s3 http://minio.example.com:9000/bucket
 
-# Exclude files by regex
+# Dry run to see what would be generated
-s3-genindex -x "(build|node_modules|\.tmp)"
+s3-genindex -d /path/to/dir -n
+
+# Show index.html files in listings
+s3-genindex -d /path/to/dir -i
 ```
 
 ## Build
@@ -28,4 +44,4 @@ make build
 make test
 ```
 
-See [docs/DETAILS.md](docs/DETAILS.md) for complete documentation.
+See [docs/DETAILS.md](docs/DETAILS.md) for complete documentation and examples.

cmd/s3-genindex/main.go

@@ -28,6 +28,13 @@ type S3Config struct {
 	UseSSL   bool
 }
 
+// S3Object represents an S3 object
+type S3Object struct {
+	Key          string
+	Size         int64
+	LastModified time.Time
+}
+
 // parseS3URL parses S3 URL and extracts endpoint and bucket
 // Example: http://minio0.chbtl0.net.ipng.ch:9000/ctlog-ro
 // Returns: endpoint=minio0.chbtl0.net.ipng.ch:9000, bucket=ctlog-ro, useSSL=false
@@ -62,15 +69,6 @@ func parseS3URL(s3URL string) (*S3Config, error) {
 
 // processS3Bucket processes an S3 bucket and generates index files
 func processS3Bucket(s3Config *S3Config, opts *indexgen.Options) error {
-	if opts.DryRun {
-		// In dry run mode, just show what would be done without connecting
-		fmt.Printf("Would connect to S3 endpoint: %s\n", s3Config.Endpoint)
-		fmt.Printf("Would list objects in bucket: %s\n", s3Config.Bucket)
-		fmt.Printf("Would write S3 index file: %s\n", opts.OutputFile)
-		fmt.Printf("Note: Dry run mode - no actual S3 connection made\n")
-		return nil
-	}
-
 	// Get credentials from environment variables
 	accessKey := os.Getenv("AWS_ACCESS_KEY_ID")
 	secretKey := os.Getenv("AWS_SECRET_ACCESS_KEY")
@@ -108,8 +106,8 @@ func processS3Bucket(s3Config *S3Config, opts *indexgen.Options) error {
 		return fmt.Errorf("failed to list S3 objects: %w", err)
 	}
 
-	// Convert S3 objects to FileEntry format
+	// Collect all S3 objects
-	var entries []indexgen.FileEntry
+	var allObjects []S3Object
 	for _, obj := range result.Contents {
 		if obj.Key == nil {
 			continue
@@ -127,6 +125,11 @@ func processS3Bucket(s3Config *S3Config, opts *indexgen.Options) error {
 			continue
 		}
 
+		// Skip index.html files unless ShowIndexFiles is enabled
+		if !opts.ShowIndexFiles && strings.HasSuffix(keyName, opts.OutputFile) {
+			continue
+		}
+
 		// Simple glob matching for filter
 		if opts.Filter != "*" && opts.Filter != "" {
 			matched, err := filepath.Match(opts.Filter, keyName)
@@ -135,101 +138,203 @@ func processS3Bucket(s3Config *S3Config, opts *indexgen.Options) error {
 			}
 		}
 
-		entry := indexgen.FileEntry{
+		allObjects = append(allObjects, S3Object{
-			Name:         keyName,
+			Key:          keyName,
-			Path:         keyName,
-			IsDir:        false,
 			Size:         *obj.Size,
-			ModTime:      *obj.LastModified,
+			LastModified: *obj.LastModified,
-			IsSymlink:    false,
+		})
-			IconType:     indexgen.GetIconType(keyName),
-			SizePretty:   indexgen.PrettySize(*obj.Size),
-			ModTimeISO:   obj.LastModified.Format(time.RFC3339),
-			ModTimeHuman: obj.LastModified.Format(time.RFC822),
-		}
-
-		// Set CSS class based on file type
-		if entry.IsDir {
-			entry.CSSClass = "dir"
-		} else if entry.IsSymlink {
-			entry.CSSClass = "symlink"
-		} else {
-			entry.CSSClass = "file"
-		}
-
-		entries = append(entries, entry)
 
 		if opts.Verbose {
-			log.Printf("Found object: %s (%s)", entry.Name, entry.SizePretty)
+			log.Printf("Found object: %s (%s)", keyName, indexgen.PrettySize(*obj.Size))
 		}
 	}
 
+	// Process hierarchical directory structure
+	return processS3Hierarchy(allObjects, opts, client, s3Config)
+}
+
+// processS3Hierarchy processes S3 objects hierarchically like filesystem directories
+func processS3Hierarchy(objects []S3Object, opts *indexgen.Options, client *s3.Client, s3Config *S3Config) error {
+	// Group objects by directory path
+	dirMap := make(map[string][]indexgen.FileEntry)
+
+	// Track all directory paths we need to create indexes for
+	allDirs := make(map[string]bool)
+
+	for _, obj := range objects {
+		// Split the key into directory parts
+		parts := strings.Split(obj.Key, "/")
+
+		if len(parts) == 1 {
+			// Root level file
+			entry := createFileEntry(obj, obj.Key)
+			dirMap[""] = append(dirMap[""], entry)
+		} else {
+			// File in a subdirectory
+			fileName := parts[len(parts)-1]
+			dirPath := strings.Join(parts[:len(parts)-1], "/")
+
+			// Create file entry
+			entry := createFileEntry(obj, fileName)
+			dirMap[dirPath] = append(dirMap[dirPath], entry)
+
+			// Track all parent directories
+			currentPath := ""
+			for i, part := range parts[:len(parts)-1] {
+				if i == 0 {
+					currentPath = part
+				} else {
+					currentPath = currentPath + "/" + part
+				}
+				allDirs[currentPath] = true
+			}
+		}
+	}
+
+	// Add directory entries to parent directories
+	for dirPath := range allDirs {
+		parentPath := ""
+		if strings.Contains(dirPath, "/") {
+			parts := strings.Split(dirPath, "/")
+			parentPath = strings.Join(parts[:len(parts)-1], "/")
+		}
+
+		dirName := filepath.Base(dirPath)
+		// Build the correct relative path for S3 (relative to current directory)
+		dirEntryPath := dirName + "/"
+		if opts.DirAppend {
+			dirEntryPath += opts.OutputFile
+		}
+
+		dirEntry := indexgen.FileEntry{
+			Name:         dirName,
+			Path:         dirEntryPath,
+			IsDir:        true,
+			Size:         -1,
+			IsSymlink:    false,
+			IconType:     "folder",
+			CSSClass:     "folder_filled",
+			SizePretty:   "—",
+			ModTimeISO:   time.Now().Format(time.RFC3339),
+			ModTimeHuman: time.Now().Format(time.RFC822),
+		}
+
+		dirMap[parentPath] = append(dirMap[parentPath], dirEntry)
+	}
+
 	// Set TopDir to bucket name for template generation
 	opts.TopDir = s3Config.Bucket
 
-	// Generate HTML from entries - need to implement this function
+	// Generate index.html for each directory
-	return generateS3HTML(entries, opts)
+	for dirPath, entries := range dirMap {
+		indexKey := dirPath
+		if indexKey != "" {
+			indexKey += "/"
+		}
+		indexKey += opts.OutputFile
+
+		err := generateS3HTML(entries, opts, client, s3Config, indexKey)
+		if err != nil {
+			return fmt.Errorf("failed to generate index for %s: %w", dirPath, err)
+		}
+	}
+
+	return nil
 }
 
-// generateS3HTML generates HTML index for S3 objects using the existing template system
+// createFileEntry creates a FileEntry from an S3Object
-func generateS3HTML(entries []indexgen.FileEntry, opts *indexgen.Options) error {
+func createFileEntry(obj S3Object, displayName string) indexgen.FileEntry {
+	return indexgen.FileEntry{
+		Name:         displayName,
+		Path:         displayName,
+		IsDir:        false,
+		Size:         obj.Size,
+		ModTime:      obj.LastModified,
+		IsSymlink:    false,
+		IconType:     indexgen.GetIconType(displayName),
+		CSSClass:     "file",
+		SizePretty:   indexgen.PrettySize(obj.Size),
+		ModTimeISO:   obj.LastModified.Format(time.RFC3339),
+		ModTimeHuman: obj.LastModified.Format(time.RFC822),
+	}
+}
+
+// generateS3HTML generates HTML index for S3 objects and uploads to S3
+func generateS3HTML(entries []indexgen.FileEntry, opts *indexgen.Options, client *s3.Client, s3Config *S3Config, indexKey string) error {
 	// Sort entries by name (similar to filesystem behavior)
 	sort.Slice(entries, func(i, j int) bool {
 		return entries[i].Name < entries[j].Name
 	})
 
-	// Determine output file
+	// Use the provided index key
-	outputFile := opts.OutputFile
-	if outputFile == "" {
-		outputFile = indexgen.DefaultOutputFile
-	}
 
-	if opts.DryRun {
-		// Dry run mode: show what would be written
-		fmt.Printf("Would write S3 index file: %s\n", outputFile)
-		fmt.Printf("S3 bucket: %s\n", opts.TopDir)
-		fmt.Printf("Objects found: %d\n", len(entries))
-		for _, entry := range entries {
-			fmt.Printf("  object: %s (%s)\n", entry.Name, entry.SizePretty)
-		}
-		return nil
-	}
-
-	// Normal mode: actually write the file
 	// Get the HTML template
 	tmpl := indexgen.GetHTMLTemplate()
 	if tmpl == nil {
 		return fmt.Errorf("failed to get HTML template")
 	}
 
+	// Determine if we're at root level (no parent directory)
+	isRoot := (indexKey == opts.OutputFile) // root level index.html
+
 	// Prepare template data (similar to ProcessDir in indexgen)
 	data := struct {
-		DirName    string
+		DirName      string
-		Entries    []indexgen.FileEntry
+		Entries      []indexgen.FileEntry
-		DirAppend  bool
+		DirAppend    bool
-		OutputFile string
+		OutputFile   string
+		IsRoot       bool
+		WatermarkURL string
 	}{
-		DirName:    opts.TopDir, // Use bucket name as directory name
+		DirName:      opts.TopDir, // Use bucket name as directory name
-		Entries:    entries,
+		Entries:      entries,
-		DirAppend:  opts.DirAppend,
+		DirAppend:    opts.DirAppend,
-		OutputFile: opts.OutputFile,
+		OutputFile:   opts.OutputFile,
+		IsRoot:       isRoot,
+		WatermarkURL: opts.WatermarkURL,
 	}
 
-	// Create output file
+	// Generate HTML content in memory
-	file, err := os.Create(outputFile)
+	var htmlBuffer strings.Builder
-	if err != nil {
+	err := tmpl.Execute(&htmlBuffer, data)
-		return fmt.Errorf("failed to create output file %s: %w", outputFile, err)
-	}
-	defer file.Close()
-
-	// Execute template
-	err = tmpl.Execute(file, data)
 	if err != nil {
 		return fmt.Errorf("failed to execute template: %w", err)
 	}
 
+	htmlContent := htmlBuffer.String()
+
+	if opts.DryRun {
+		// Dry run mode: show what would be written but don't upload
+		fmt.Printf("Would upload S3 index file: s3://%s/%s\n", s3Config.Bucket, indexKey)
+		fmt.Printf("Directory level: %s\n", strings.TrimSuffix(indexKey, "/"+opts.OutputFile))
+		fmt.Printf("Objects found: %d\n", len(entries))
+		fmt.Printf("Generated HTML size: %d bytes\n", len(htmlContent))
+		for _, entry := range entries {
+			entryType := "file"
+			if entry.IsDir {
+				entryType = "directory"
+			}
+			fmt.Printf("  %s: %s (%s)\n", entryType, entry.Name, entry.SizePretty)
+		}
+		return nil
+	}
+
+	// Upload HTML to S3
+	ctx := context.Background()
+	putInput := &s3.PutObjectInput{
+		Bucket:      aws.String(s3Config.Bucket),
+		Key:         aws.String(indexKey),
+		Body:        strings.NewReader(htmlContent),
+		ContentType: aws.String("text/html"),
+	}
+
+	_, err = client.PutObject(ctx, putInput)
+	if err != nil {
+		return fmt.Errorf("failed to upload %s to S3: %w", indexKey, err)
+	}
+
 	if opts.Verbose {
-		log.Printf("Generated index file: %s (%d entries)", outputFile, len(entries))
+		log.Printf("Uploaded index file: %s to S3 bucket %s (%d entries)", indexKey, s3Config.Bucket, len(entries))
 	}
 
 	return nil
@@ -241,6 +346,8 @@ func main() {
 	var directory string
 	var s3URL string
 	var dryRun bool
+	var showIndexFiles bool
+	var watermarkURL string
 
 	// Set defaults
 	opts.DirAppend = true
@@ -254,6 +361,8 @@ func main() {
 	flag.BoolVar(&dryRun, "n", false, "dry run: show what would be written without actually writing")
 	flag.StringVar(&excludeRegexStr, "x", "", "exclude files matching regular expression")
 	flag.BoolVar(&opts.Verbose, "v", false, "verbosely list every processed file")
+	flag.BoolVar(&showIndexFiles, "i", false, "show index.html files in directory listings")
+	flag.StringVar(&watermarkURL, "wm", "", "watermark logo URL to display in top left corner")
 
 	flag.Usage = func() {
 		fmt.Fprintf(os.Stderr, "Generate directory index files (recursive is ON, hidden files included by default).\n")
@@ -293,8 +402,10 @@ func main() {
 		}
 	}
 
-	// Set dry run flag
+	// Set dry run, show index files, and watermark URL
 	opts.DryRun = dryRun
+	opts.ShowIndexFiles = showIndexFiles
+	opts.WatermarkURL = watermarkURL
 
 	if s3URL != "" {
 		// Parse S3 URL

docs/DETAILS.md

@@ -2,18 +2,20 @@
 
 ## Overview
 
-s3-genindex is a Go rewrite of the original Python genindex.py script. It generates HTML directory listings with file type icons, responsive design, and dark mode support.
+s3-genindex is a program that generates HTML directory listings with file type icons, responsive design, and dark mode support for both local directories and S3-compatible storage systems.
 
 ## Features
 
+- **Local Directory Indexing**: Recursive traversal of filesystem directories
+- **S3-Compatible Storage**: Support for MinIO, AWS S3, and other S3-compatible systems
+- **Hierarchical Structure**: Creates proper directory navigation for S3 buckets
 - **File Type Detection**: Recognizes 100+ file extensions with appropriate icons
 - **Responsive Design**: Works on desktop and mobile devices
 - **Dark Mode**: Automatic dark mode support based on system preferences
-- **Recursive Processing**: Generate indexes for entire directory trees
+- **Dry Run Mode**: Preview what would be generated without writing files
-- **File Filtering**: Include/exclude files by pattern or regex
+- **File Filtering**: Include/exclude files by glob patterns or regex
 - **Symlink Support**: Special handling for symbolic links
-- **Custom Output**: Configurable output filename
+- **Index File Control**: Show/hide index.html files in directory listings
-- **Breadcrumb Navigation**: Parent directory navigation
 
 ## Installation
 
@@ -34,66 +36,118 @@ go install git.ipng.ch/ipng/s3-genindex/cmd/s3-genindex@latest
 ## Command Line Options
 
 ```
-Usage: s3-genindex [OPTIONS] [directory]
+Usage: s3-genindex [OPTIONS]
 
-  -d	append output file to directory href
+  -d string
+    	local directory to process
+  -s3 string
+    	S3 URL to process
   -f string
     	only include files matching glob (default "*")
-  -i	include dot hidden files
+  -i	show index.html files in directory listings
-  -o string
+  -n	dry run: show what would be written without actually writing
-    	custom output file (default "index.html")
-  -r	recursively process nested dirs
   -v	verbosely list every processed file
   -x string
     	exclude files matching regular expression
 ```
 
+**Note**: Either `-d <directory>` or `-s3 <url>` must be specified (mutually exclusive).
+
 ## Usage Examples
 
-### Basic Usage
+### Local Directory Processing (`-d`)
 
 ```bash
-# Generate index.html in current directory
+# Generate index.html for a local directory
-s3-genindex
+s3-genindex -d /var/www/html
 
-# Generate index for specific directory
+# Process with verbose output to see all files
-s3-genindex /path/to/directory
+s3-genindex -d /home/user/documents -v
 
-# Generate with custom output filename
+# Dry run to preview what would be generated
-s3-genindex -o listing.html
+s3-genindex -d /path/to/dir -n
+
+# Show index.html files in directory listings
+s3-genindex -d /var/www -i
 ```
 
-### Recursive Processing
+### S3 Storage Processing (`-s3`)
 
 ```bash
-# Process directory tree recursively
+# Basic S3 bucket processing (MinIO)
-s3-genindex -r
+export AWS_ACCESS_KEY_ID="your-access-key"
+export AWS_SECRET_ACCESS_KEY="your-secret-key"
+s3-genindex -s3 http://minio.example.com:9000/my-bucket
 
-# Process recursively with verbose output
+# AWS S3 bucket processing
-s3-genindex -rv /var/www
+export AWS_ACCESS_KEY_ID="your-aws-key"
+export AWS_SECRET_ACCESS_KEY="your-aws-secret"
+s3-genindex -s3 https://s3.amazonaws.com/my-bucket
+
+# S3 with verbose output and dry run
+s3-genindex -s3 http://localhost:9000/test-bucket -v -n
+
+# S3 processing with file filtering
+s3-genindex -s3 http://minio.local:9000/logs -f "*.log"
 ```
 
-### File Filtering
+### File Filtering Examples
 
 ```bash
-# Include only Python files
+# Include only specific file types
-s3-genindex -f "*.py"
+s3-genindex -d /var/log -f "*.log"
+s3-genindex -s3 http://minio:9000/images -f "*.{jpg,png,gif}"
 
-# Exclude build artifacts and dependencies
+# Exclude build artifacts and temporary files
-s3-genindex -x "(build|dist|node_modules|__pycache__|\\.tmp)"
+s3-genindex -d /home/dev/project -x "(build|dist|node_modules|__pycache__|\\.tmp)"
 
-# Include hidden files
+# Exclude version control and system files
-s3-genindex -i
+s3-genindex -d /var/www -x "(\.git|\.svn|\.DS_Store|Thumbs\.db)"
+
+# Complex filtering with multiple patterns
+s3-genindex -d /data -f "*.{json,xml,csv}" -x "(backup|temp|cache)"
 ```
 
-### Advanced Usage
+### Advanced Usage Scenarios
 
 ```bash
-# Recursive with custom output and exclusions
+# Documentation site generation for local directory
-s3-genindex -r -o index.html -x "(\.git|\.svn|node_modules)" /var/www
+s3-genindex -d /var/www/docs -i -v
 
-# Verbose processing with directory appending
+# Log file indexing on S3 with size filtering
-s3-genindex -r -v -d /home/user/public
+s3-genindex -s3 http://minio:9000/application-logs -f "*.log" -v
+
+# Website asset indexing (excluding index files)
+s3-genindex -d /var/www/assets -x "(index\.html|\.htaccess)"
+
+# Backup verification with dry run
+s3-genindex -s3 https://backup.s3.amazonaws.com/daily-backups -n -v
+
+# Development file browsing with hidden files
+s3-genindex -d /home/dev/src -i -x "(\.git|node_modules|vendor)"
+
+# Media gallery generation
+s3-genindex -d /var/media -f "*.{jpg,jpeg,png,gif,mp4,mov}" -i
+```
+
+### Integration Examples
+
+```bash
+# Automated documentation updates (cron job)
+#!/bin/bash
+export AWS_ACCESS_KEY_ID="docs-access-key"
+export AWS_SECRET_ACCESS_KEY="docs-secret-key"
+s3-genindex -s3 https://docs.s3.amazonaws.com/api-docs -v
+
+# Local web server directory indexing
+s3-genindex -d /var/www/html -i
+nginx -s reload
+
+# CI/CD artifact indexing
+s3-genindex -s3 http://artifacts.internal:9000/build-artifacts -f "*.{tar.gz,zip}" -v
+
+# Photo gallery with metadata
+s3-genindex -d /var/photos -f "*.{jpg,jpeg,png,heic}" -i -v
 ```
 
 ## File Type Support
@@ -206,11 +260,40 @@ make lint     # Run golangci-lint (if installed)
 make check    # Run all quality checks
 ```
 
+## S3 Configuration
+
+### Environment Variables for S3
+
+When using S3 storage (`-s3` flag), the following environment variables are **required**:
+
+- `AWS_ACCESS_KEY_ID`: Your S3 access key ID
+- `AWS_SECRET_ACCESS_KEY`: Your S3 secret access key
+
+### S3 URL Format
+
+S3 URLs should follow this format:
+```
+http://host:port/bucket    # For MinIO or custom S3-compatible storage
+https://host/bucket        # For HTTPS endpoints
+```
+
+Examples:
+- `http://minio.example.com:9000/my-bucket`
+- `https://s3.amazonaws.com/my-bucket`
+- `http://localhost:9000/test-bucket`
+
+### S3 Features
+
+- **Hierarchical Processing**: Creates index.html files for each directory level in S3
+- **Path-Style URLs**: Uses path-style S3 URLs for MinIO compatibility
+- **Bucket Navigation**: Generates proper directory navigation within S3 buckets
+- **No Parent Directory at Root**: Root bucket index doesn't show parent (..) link
+
 ## Configuration
 
 No configuration files are needed. All options are provided via command-line arguments.
 
-### Environment Variables
+### Standard Environment Variables
 
 The tool respects standard Go environment variables:
 - `GOOS` and `GOARCH` for cross-compilation
@@ -240,25 +323,55 @@ This Go version provides the same functionality as the original Python script wi
 
 ### Common Issues
 
-**Permission Errors**
+**Local Directory Permission Errors**
 ```bash
 # Ensure read permissions on target directory
 chmod +r /path/to/directory
 ```
 
-**Large Directories**
+**S3 Connection Issues**
 ```bash
-# Use verbose mode to monitor progress
+# Verify credentials are set
-s3-genindex -v /large/directory
+echo $AWS_ACCESS_KEY_ID
+echo $AWS_SECRET_ACCESS_KEY
 
-# Exclude unnecessary files
+# Test connection with dry run
-s3-genindex -x "(\.git|node_modules|__pycache__)"
+s3-genindex -s3 http://minio.example.com:9000/bucket -n -v
+
+# Check S3 endpoint connectivity
+curl http://minio.example.com:9000/
 ```
 
-**Memory Usage**
+**S3 Permission Errors**
 ```bash
-# Process directories individually for very large trees
+# Verify bucket access permissions
-for dir in */; do s3-genindex "$dir"; done
+aws s3 ls s3://your-bucket/ --endpoint-url http://minio.example.com:9000
+
+# Check if bucket exists and is accessible
+s3-genindex -s3 http://minio.example.com:9000/bucket -v
+```
+
+**Large Directory/Bucket Processing**
+```bash
+# Use verbose mode to monitor progress
+s3-genindex -d /large/directory -v
+s3-genindex -s3 http://minio:9000/large-bucket -v
+
+# Exclude unnecessary files to reduce processing time
+s3-genindex -d /data -x "(\.git|node_modules|__pycache__|\.tmp)"
+s3-genindex -s3 http://minio:9000/bucket -x "(backup|temp|cache)"
+
+# Use dry run to estimate processing time
+s3-genindex -s3 http://minio:9000/bucket -n
+```
+
+**Network Timeout Issues (S3)**
+```bash
+# For slow connections, use verbose mode to see progress
+s3-genindex -s3 http://slow-endpoint:9000/bucket -v
+
+# Test with smaller buckets first
+s3-genindex -s3 http://endpoint:9000/small-test-bucket -n
 ```
 
 ### Debug Mode
@@ -266,7 +379,27 @@ for dir in */; do s3-genindex "$dir"; done
 Enable verbose output to see detailed processing:
 
 ```bash
-s3-genindex -v /path/to/debug
+# Local directory debugging
+s3-genindex -d /path/to/debug -v
+
+# S3 debugging with dry run
+s3-genindex -s3 http://minio:9000/bucket -n -v
+
+# Full S3 processing with verbose output
+s3-genindex -s3 http://minio:9000/bucket -v
+```
+
+### S3-Specific Debugging
+
+```bash
+# Test S3 connectivity without processing
+curl -I http://minio.example.com:9000/bucket/
+
+# List S3 objects directly (if aws-cli is available)
+aws s3 ls s3://bucket/ --endpoint-url http://minio.example.com:9000
+
+# Verify S3 URL format
+s3-genindex -s3 http://wrong-format -n  # Will show URL parsing errors
 ```
 
 ## License
@@ -283,8 +416,26 @@ Licensed under the Apache License 2.0. See original Python script for full licen
 
 ## Changelog
 
+### v2.0.0 (Current)
+- **S3 Support**: Complete S3-compatible storage support (MinIO, AWS S3)
+- **Hierarchical S3 Processing**: Creates proper directory navigation for S3 buckets
+- **Dry Run Mode**: Preview functionality with `-n` flag
+- **Index File Control**: Show/hide index.html files with `-i` flag
+- **Mutual Exclusive Flags**: Clean separation between `-d` and `-s3` modes
+- **Enhanced Error Handling**: Better error messages and validation
+- **Comprehensive Testing**: Extended test suite covering S3 functionality
+- **URL Handling Fix**: Proper S3 navigation without URL encoding issues
+
 ### v1.0.0
-- Initial Go rewrite
+- Initial Go rewrite from Python genindex.py
-- Complete feature parity with Python version
+- Complete feature parity with Python version for local directories
 - Comprehensive test suite
-- Modern Go project structure
+- Modern Go project structure
+- Recursive directory processing
+- File type detection and icons
+- Responsive HTML design with dark mode support
+
+## Acknowledgement
+
+This tool was inspired by
+[[index-html-generator](https://github.com/glowinthedark/index-html-generator)] on GitHub.

internal/indexgen/indexgen.go

@@ -158,15 +158,17 @@ var ExtensionTypes = map[string]string{
 }
 
 type Options struct {
-	TopDir        string
+	TopDir         string
-	Filter        string
+	Filter         string
-	OutputFile    string
+	OutputFile     string
-	DirAppend     bool
+	DirAppend      bool
-	Recursive     bool
+	Recursive      bool
-	IncludeHidden bool
+	IncludeHidden  bool
-	ExcludeRegex  *regexp.Regexp
+	ExcludeRegex   *regexp.Regexp
-	Verbose       bool
+	Verbose        bool
-	DryRun        bool
+	DryRun         bool
+	ShowIndexFiles bool
+	WatermarkURL   string
 }
 
 type FileEntry struct {
@@ -210,15 +212,19 @@ func ProcessDir(topDir string, opts *Options) error {
 	})
 
 	templateData := struct {
-		DirName    string
+		DirName      string
-		Entries    []FileEntry
+		Entries      []FileEntry
-		DirAppend  bool
+		DirAppend    bool
-		OutputFile string
+		OutputFile   string
+		IsRoot       bool
+		WatermarkURL string
 	}{
-		DirName:    dirName,
+		DirName:      dirName,
-		Entries:    entries,
+		Entries:      entries,
-		DirAppend:  opts.DirAppend,
+		DirAppend:    opts.DirAppend,
-		OutputFile: opts.OutputFile,
+		OutputFile:   opts.OutputFile,
+		IsRoot:       false, // Local filesystem always shows parent directory
+		WatermarkURL: opts.WatermarkURL,
 	}
 
 	if opts.DryRun {
@@ -273,7 +279,7 @@ func ReadDirEntries(dirPath string, opts *Options) ([]FileEntry, error) {
 	for _, file := range files {
 		fileName := file.Name()
 
-		if strings.EqualFold(fileName, opts.OutputFile) {
+		if !opts.ShowIndexFiles && strings.EqualFold(fileName, opts.OutputFile) {
 			continue
 		}
 
@@ -455,6 +461,15 @@ const htmlTemplateString = `<!DOCTYPE html>
         padding-top: 25px;
         padding-bottom: 15px;
         background-color: #f2f2f2;
+        display: flex;
+        align-items: center;
+    }
+
+    .watermark {
+        height: 48px;
+        width: auto;
+        margin-right: 12px;
+        flex-shrink: 0;
     }
 
     h1 {
@@ -464,6 +479,8 @@ const htmlTemplateString = `<!DOCTYPE html>
         overflow-x: hidden;
         text-overflow: ellipsis;
         color: #999;
+        margin: 0;
+        flex: 1;
     }
 
     h1 a {
@@ -940,6 +957,7 @@ const htmlTemplateString = `<!DOCTYPE html>
 </defs>
 </svg>
 <header>
+    {{if .WatermarkURL}}<img src="{{.WatermarkURL}}" class="watermark" alt="Logo">{{end}}
     <h1>{{.DirName}}</h1>
 </header>
 <main>
@@ -957,6 +975,7 @@ const htmlTemplateString = `<!DOCTYPE html>
         </tr>
         </thead>
         <tbody>
+        {{if not .IsRoot}}
         <tr class="clickable">
             <td></td>
             <td><a href="../{{if .DirAppend}}{{.OutputFile}}{{end}}">
@@ -969,11 +988,12 @@ const htmlTemplateString = `<!DOCTYPE html>
             <td class="hideable">&mdash;</td>
             <td class="hideable"></td>
         </tr>
+        {{end}}
         {{range .Entries}}
         <tr class="file">
             <td></td>
             <td>
-                <a href="{{urlEscape .Path}}">
+                <a href="{{.Path}}">
                     <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round"><use xlink:href="#{{.IconType}}" class="{{.CSSClass}}"></use></svg>
                     <span class="name">{{.Name}}</span>
                 </a>

internal/indexgen/indexgen_test.go

@@ -97,15 +97,19 @@ func TestHTMLTemplate(t *testing.T) {
 
 	// Test template execution with sample data
 	data := struct {
-		DirName    string
+		DirName      string
-		Entries    []FileEntry
+		Entries      []FileEntry
-		DirAppend  bool
+		DirAppend    bool
-		OutputFile string
+		OutputFile   string
+		IsRoot       bool
+		WatermarkURL string
 	}{
-		DirName:    "test-dir",
+		DirName:      "test-dir",
-		Entries:    []FileEntry{},
+		Entries:      []FileEntry{},
-		DirAppend:  false,
+		DirAppend:    false,
-		OutputFile: "index.html",
+		OutputFile:   "index.html",
+		IsRoot:       false,
+		WatermarkURL: "",
 	}
 
 	var buf bytes.Buffer
@@ -157,15 +161,19 @@ func TestHTMLTemplateWithEntries(t *testing.T) {
 	}
 
 	data := struct {
-		DirName    string
+		DirName      string
-		Entries    []FileEntry
+		Entries      []FileEntry
-		DirAppend  bool
+		DirAppend    bool
-		OutputFile string
+		OutputFile   string
+		IsRoot       bool
+		WatermarkURL string
 	}{
-		DirName:    "test-dir",
+		DirName:      "test-dir",
-		Entries:    entries,
+		Entries:      entries,
-		DirAppend:  false,
+		DirAppend:    false,
-		OutputFile: "index.html",
+		OutputFile:   "index.html",
+		IsRoot:       false,
+		WatermarkURL: "",
 	}
 
 	var buf bytes.Buffer
@@ -192,6 +200,62 @@ func TestHTMLTemplateWithEntries(t *testing.T) {
 	}
 }
 
+func TestHTMLTemplateWithWatermark(t *testing.T) {
+	tmpl := GetHTMLTemplate()
+	if tmpl == nil {
+		t.Fatal("GetHTMLTemplate() returned nil")
+	}
+
+	// Test template execution with watermark
+	data := struct {
+		DirName      string
+		Entries      []FileEntry
+		DirAppend    bool
+		OutputFile   string
+		IsRoot       bool
+		WatermarkURL string
+	}{
+		DirName:      "test-dir",
+		Entries:      []FileEntry{},
+		DirAppend:    false,
+		OutputFile:   "index.html",
+		IsRoot:       false,
+		WatermarkURL: "https://example.com/logo.svg",
+	}
+
+	var buf bytes.Buffer
+	err := tmpl.Execute(&buf, data)
+	if err != nil {
+		t.Fatalf("Template execution with watermark failed: %v", err)
+	}
+
+	output := buf.String()
+
+	// Check that watermark image is included
+	if !bytes.Contains([]byte(output), []byte(`src="https://example.com/logo.svg"`)) {
+		t.Error("Template output should contain watermark image URL")
+	}
+
+	if !bytes.Contains([]byte(output), []byte(`class="watermark"`)) {
+		t.Error("Template output should contain watermark CSS class")
+	}
+
+	// Test without watermark
+	data.WatermarkURL = ""
+	buf.Reset()
+	err = tmpl.Execute(&buf, data)
+	if err != nil {
+		t.Fatalf("Template execution without watermark failed: %v", err)
+	}
+
+	outputNoWatermark := buf.String()
+
+	// Check that watermark image is NOT included when URL is empty
+	if bytes.Contains([]byte(outputNoWatermark), []byte(`class="watermark"`)) {
+		t.Error("Template output should not contain watermark when URL is empty")
+	}
+}
+
 func TestReadDirEntries(t *testing.T) {
 	// Create a temporary directory with test files
 	tempDir := t.TempDir()

internal/indexgen/integration_test.go

@@ -245,9 +245,9 @@ func TestProcessDirWithDirAppend(t *testing.T) {
 
 	htmlContent := string(content)
 
-	// Check that directory links include index.html (URL escaped)
+	// Check that directory links include index.html
-	if !strings.Contains(htmlContent, "subdir%2Findex.html") {
+	if !strings.Contains(htmlContent, "subdir/index.html") {
-		t.Errorf("Directory links should include index.html when DirAppend is true. Expected subdir%%2Findex.html in content")
+		t.Errorf("Directory links should include index.html when DirAppend is true. Expected subdir/index.html in content")
 	}
 }