Add list command to display all tracked entries

Adds Garden.List() method that returns manifest entries, unit tests
for empty and populated repos, and a CLI command that formats output
by entry type (file with hash prefix, link with target, directory).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cmd/sgard/list.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/kisom/sgard/garden"
+	"github.com/spf13/cobra"
+)
+
+var listCmd = &cobra.Command{
+	Use:   "list",
+	Short: "List all tracked files",
+	RunE: func(cmd *cobra.Command, args []string) error {
+		g, err := garden.Open(repoFlag)
+		if err != nil {
+			return err
+		}
+
+		entries := g.List()
+		for _, e := range entries {
+			switch e.Type {
+			case "file":
+				hash := e.Hash
+				if len(hash) > 8 {
+					hash = hash[:8]
+				}
+				fmt.Printf("%-6s %s\t%s\n", "file", e.Path, hash)
+			case "link":
+				fmt.Printf("%-6s %s\t-> %s\n", "link", e.Path, e.Target)
+			case "directory":
+				fmt.Printf("%-6s %s\n", "dir", e.Path)
+			}
+		}
+
+		return nil
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(listCmd)
+}

garden/list.go

@@ -0,0 +1,8 @@
+package garden
+
+import "github.com/kisom/sgard/manifest"
+
+// List returns all tracked entries from the manifest.
+func (g *Garden) List() []manifest.Entry {
+	return g.manifest.Files
+}

garden/list_test.go

@@ -0,0 +1,67 @@
+package garden
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestListEmpty(t *testing.T) {
+	root := t.TempDir()
+	repoDir := filepath.Join(root, "repo")
+
+	g, err := Init(repoDir)
+	if err != nil {
+		t.Fatalf("Init: %v", err)
+	}
+
+	entries := g.List()
+	if len(entries) != 0 {
+		t.Errorf("expected 0 entries, got %d", len(entries))
+	}
+}
+
+func TestListAfterAdd(t *testing.T) {
+	root := t.TempDir()
+	repoDir := filepath.Join(root, "repo")
+
+	g, err := Init(repoDir)
+	if err != nil {
+		t.Fatalf("Init: %v", err)
+	}
+
+	// Create two files and add them.
+	file1 := filepath.Join(root, "file1")
+	if err := os.WriteFile(file1, []byte("one"), 0o644); err != nil {
+		t.Fatalf("writing file1: %v", err)
+	}
+	file2 := filepath.Join(root, "file2")
+	if err := os.WriteFile(file2, []byte("two"), 0o644); err != nil {
+		t.Fatalf("writing file2: %v", err)
+	}
+
+	if err := g.Add([]string{file1, file2}); err != nil {
+		t.Fatalf("Add: %v", err)
+	}
+
+	entries := g.List()
+	if len(entries) != 2 {
+		t.Fatalf("expected 2 entries, got %d", len(entries))
+	}
+
+	// Verify entries have the correct paths (in tilde form).
+	paths := make(map[string]bool)
+	for _, e := range entries {
+		paths[e.Path] = true
+	}
+
+	want1 := toTildePath(file1)
+	want2 := toTildePath(file2)
+
+	if !paths[want1] {
+		t.Errorf("missing entry for %s", want1)
+	}
+	if !paths[want2] {
+		t.Errorf("missing entry for %s", want2)
+	}
+}