finished, also added cobra cli

internal/config/config.go

@@ -0,0 +1,135 @@
+package config
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+const (
+	DefaultMaxSize  = 512 * 1024
+	DefaultMaxDepth = 20
+	Version         = "0.1.0"
+)
+
+var DefaultIgnores = []string{
+	".git",
+	"node_modules",
+	"vendor",
+	"bin",
+}
+
+var DefaultExts = []string{
+	".jpg", ".jpeg", ".png", ".gif", ".bmp", ".tiff", ".ico",
+	".mp4", ".avi", ".mov", ".mkv", ".webm",
+	".mp3", ".wav", ".flac", ".ogg",
+	".zip", ".tar", ".gz", ".bz2", ".xz", ".7z", ".rar",
+	".exe", ".dll", ".so", ".dylib", ".wasm",
+	".pdf", ".doc", ".docx", ".xls", ".xlsx",
+	".pem", ".key", ".cert",
+	".db", ".sqlite", ".sqlite3",
+}
+
+type stringSlice []string
+
+func (s *stringSlice) String() string {
+	return strings.Join(*s, ", ")
+}
+
+func (s *stringSlice) Set(v string) error {
+	*s = append(*s, v)
+	return nil
+}
+
+type Config struct {
+	InputPath  string
+	OutputPath string
+	AppendMode bool
+	SingleFile bool
+	MaxSize    int64
+	MaxDepth   int
+	Ignores    []string
+	Extensions []string
+	AbsRoot    string
+}
+
+func PrintUsage() {
+	fmt.Fprintf(os.Stderr, "dirmd v%s\n\n", Version)
+	fmt.Fprintf(os.Stderr, "Usage: dirmd [flags] <directory>\n")
+	fmt.Fprintf(os.Stderr, "       dirmd -a -i <file> -o <output>\n\n")
+	fmt.Fprintf(os.Stderr, "Flags:\n")
+	flag.PrintDefaults()
+}
+
+func Parse() (*Config, error) {
+	var (
+		input    string
+		output   string
+		appendMd bool
+		maxSize  int64
+		maxDepth int
+		ignores  stringSlice
+		exts     stringSlice
+		showVer  bool
+	)
+
+	flag.StringVar(&input, "i", "", "single file input (append mode only)")
+	flag.StringVar(&output, "o", "", "output markdown file path (required)")
+	flag.BoolVar(&appendMd, "a", false, "append to existing output file")
+	flag.Int64Var(&maxSize, "max-size", DefaultMaxSize, "max file size in bytes")
+	flag.IntVar(&maxDepth, "max-depth", DefaultMaxDepth, "max directory recursion depth")
+	flag.Var(&ignores, "ignore", "additional ignore patterns (glob, repeatable)")
+	flag.Var(&exts, "extensions", "additional file extensions to skip (repeatable)")
+	flag.BoolVar(&showVer, "version", false, "print version and exit")
+
+	flag.Usage = PrintUsage
+	flag.Parse()
+
+	if showVer {
+		fmt.Printf("dirmd v%s\n", Version)
+		os.Exit(0)
+	}
+
+	if output == "" {
+		return nil, fmt.Errorf("-o is required")
+	}
+
+	cfg := &Config{
+		OutputPath: output,
+		AppendMode: appendMd,
+		MaxSize:    maxSize,
+		MaxDepth:   maxDepth,
+		Ignores:    append(DefaultIgnores, ignores...),
+		Extensions: append(DefaultExts, exts...),
+	}
+
+	if input != "" {
+		cfg.SingleFile = true
+		cfg.InputPath = input
+		if !appendMd {
+			return nil, fmt.Errorf("single file input (-i) requires append mode (-a)")
+		}
+	} else {
+		args := flag.Args()
+		if len(args) < 1 {
+			return nil, fmt.Errorf("directory argument is required when -i is not used")
+		}
+		cfg.InputPath = args[0]
+	}
+
+	abs, err := filepath.Abs(cfg.InputPath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to resolve absolute path: %w", err)
+	}
+	cfg.AbsRoot = abs
+
+	if !appendMd {
+		if _, err := os.Stat(output); err == nil {
+			return nil, fmt.Errorf("output file %s already exists (use -a to append)", output)
+		}
+	}
+
+	return cfg, nil
+}