Add list command to show manifest contents

- mfer list: shows file paths one per line
- mfer list -l/--long: shows size, mtime, and path
- mfer list --print0: NUL-separated output for xargs -0

internal/cli/list.go

@@ -0,0 +1,65 @@
+package cli
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/urfave/cli/v2"
+	"sneak.berlin/go/mfer/internal/log"
+	"sneak.berlin/go/mfer/mfer"
+)
+
+func (mfa *CLIApp) listManifestOperation(ctx *cli.Context) error {
+	// Default to ErrorLevel for clean output
+	log.SetLevel(log.ErrorLevel)
+
+	longFormat := ctx.Bool("long")
+	print0 := ctx.Bool("print0")
+
+	// Find manifest file
+	var manifestPath string
+	var err error
+
+	if ctx.Args().Len() > 0 {
+		arg := ctx.Args().Get(0)
+		info, statErr := mfa.Fs.Stat(arg)
+		if statErr == nil && info.IsDir() {
+			manifestPath, err = findManifest(mfa.Fs, arg)
+			if err != nil {
+				return err
+			}
+		} else {
+			manifestPath = arg
+		}
+	} else {
+		manifestPath, err = findManifest(mfa.Fs, ".")
+		if err != nil {
+			return err
+		}
+	}
+
+	// Load manifest
+	manifest, err := mfer.NewManifestFromFile(mfa.Fs, manifestPath)
+	if err != nil {
+		return fmt.Errorf("failed to load manifest: %w", err)
+	}
+
+	files := manifest.Files()
+
+	// Determine line ending
+	lineEnd := "\n"
+	if print0 {
+		lineEnd = "\x00"
+	}
+
+	for _, f := range files {
+		if longFormat {
+			mtime := time.Unix(f.Mtime.Seconds, int64(f.Mtime.Nanos))
+			_, _ = fmt.Fprintf(mfa.Stdout, "%d\t%s\t%s%s", f.Size, mtime.Format(time.RFC3339), f.Path, lineEnd)
+		} else {
+			_, _ = fmt.Fprintf(mfa.Stdout, "%s%s", f.Path, lineEnd)
+		}
+	}
+
+	return nil
+}

internal/cli/mfer.go

@@ -216,6 +216,26 @@ func (mfa *CLIApp) run(args []string) {
 					return nil
 				},
 			},
+			{
+				Name:      "list",
+				Aliases:   []string{"ls"},
+				Usage:     "List files in manifest",
+				ArgsUsage: "[manifest file]",
+				Action: func(c *cli.Context) error {
+					return mfa.listManifestOperation(c)
+				},
+				Flags: []cli.Flag{
+					&cli.BoolFlag{
+						Name:    "long",
+						Aliases: []string{"l"},
+						Usage:   "Show size and mtime",
+					},
+					&cli.BoolFlag{
+						Name:  "print0",
+						Usage: "Separate entries with NUL character (for xargs -0)",
+					},
+				},
+			},
 			{
 				Name:  "fetch",
 				Usage: "fetch manifest and referenced files",