feat: add replace subcommand with multi-pattern support

tests/integration/replace_flow_test.go

@@ -0,0 +1,101 @@
+package integration
+
+import (
+	"bytes"
+	"context"
+	"os"
+	"path/filepath"
+	"testing"
+
+	renamercmd "github.com/rogeecn/renamer/cmd"
+	"github.com/rogeecn/renamer/internal/history"
+	"github.com/rogeecn/renamer/internal/replace"
+)
+
+func TestReplaceApplyAndUndo(t *testing.T) {
+	tmp := t.TempDir()
+
+	createFile(t, filepath.Join(tmp, "foo_draft.txt"))
+	createFile(t, filepath.Join(tmp, "bar_draft.txt"))
+
+	parsed, err := replace.ParseArgs([]string{"draft", "final"})
+	if err != nil {
+		t.Fatalf("ParseArgs error: %v", err)
+	}
+
+	req := &replace.ReplaceRequest{
+		WorkingDir:  tmp,
+		Patterns:    parsed.Patterns,
+		Replacement: parsed.Replacement,
+	}
+
+	summary, planned, err := replace.Preview(context.Background(), req, parsed, nil)
+	if err != nil {
+		t.Fatalf("Preview error: %v", err)
+	}
+	if summary.ChangedCount != 2 {
+		t.Fatalf("expected 2 changes, got %d", summary.ChangedCount)
+	}
+
+	entry, err := replace.Apply(context.Background(), req, planned, summary)
+	if err != nil {
+		t.Fatalf("apply error: %v", err)
+	}
+
+	if len(entry.Operations) != 2 {
+		t.Fatalf("expected 2 operations recorded, got %d", len(entry.Operations))
+	}
+	if entry.Metadata == nil {
+		t.Fatalf("expected metadata to be recorded")
+	}
+	counts, ok := entry.Metadata["patterns"].(map[string]int)
+	if !ok {
+		t.Fatalf("patterns metadata missing or wrong type: %#v", entry.Metadata)
+	}
+	if counts["draft"] != 2 {
+		t.Fatalf("expected pattern count for 'draft' to be 2, got %d", counts["draft"])
+	}
+
+	if _, err := os.Stat(filepath.Join(tmp, "foo_final.txt")); err != nil {
+		t.Fatalf("expected renamed file exists: %v", err)
+	}
+
+	if _, err := os.Stat(filepath.Join(tmp, "bar_final.txt")); err != nil {
+		t.Fatalf("expected renamed file exists: %v", err)
+	}
+
+	_, err = history.Undo(tmp)
+	if err != nil {
+		t.Fatalf("undo error: %v", err)
+	}
+
+	if _, err := os.Stat(filepath.Join(tmp, "foo_draft.txt")); err != nil {
+		t.Fatalf("expected original file after undo: %v", err)
+	}
+	if _, err := os.Stat(filepath.Join(tmp, "bar_draft.txt")); err != nil {
+		t.Fatalf("expected original file after undo: %v", err)
+	}
+}
+
+func TestReplaceCommandInvalidArgs(t *testing.T) {
+	root := renamercmd.NewRootCommand()
+	var out bytes.Buffer
+	root.SetOut(&out)
+	root.SetErr(&out)
+	root.SetArgs([]string{"replace", "onlyone"})
+
+	err := root.Execute()
+	if err == nil {
+		t.Fatalf("expected error for insufficient arguments")
+	}
+}
+
+func createFile(t *testing.T, path string) {
+	t.Helper()
+	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
+		t.Fatalf("mkdir %s: %v", path, err)
+	}
+	if err := os.WriteFile(path, []byte("x"), 0o644); err != nil {
+		t.Fatalf("write file %s: %v", path, err)
+	}
+}