Add configurable sequence numbering command

tests/integration/sequence_width_test.go

@@ -0,0 +1,59 @@
+package integration
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/rogeecn/renamer/internal/history"
+	"github.com/rogeecn/renamer/internal/sequence"
+)
+
+func TestSequenceApplyWithExplicitWidth(t *testing.T) {
+	tmp := t.TempDir()
+
+	createIntegrationFile(t, filepath.Join(tmp, "cutA.mov"))
+	createIntegrationFile(t, filepath.Join(tmp, "cutB.mov"))
+
+	opts := sequence.DefaultOptions()
+	opts.WorkingDir = tmp
+	opts.Width = 4
+
+	plan, err := sequence.Preview(context.Background(), opts, nil)
+	if err != nil {
+		t.Fatalf("preview error: %v", err)
+	}
+
+	if plan.Summary.AppliedWidth != 4 {
+		t.Fatalf("expected applied width 4, got %d", plan.Summary.AppliedWidth)
+	}
+
+	entry, err := sequence.Apply(context.Background(), opts, plan)
+	if err != nil {
+		t.Fatalf("apply error: %v", err)
+	}
+
+	if len(entry.Operations) != 2 {
+		t.Fatalf("expected 2 operations, got %d", len(entry.Operations))
+	}
+
+	if _, err := os.Stat(filepath.Join(tmp, "0001_cutA.mov")); err != nil {
+		t.Fatalf("expected renamed file exists: %v", err)
+	}
+	if _, err := os.Stat(filepath.Join(tmp, "0002_cutB.mov")); err != nil {
+		t.Fatalf("expected renamed file exists: %v", err)
+	}
+
+	meta, ok := entry.Metadata["sequence"].(map[string]any)
+	if !ok {
+		t.Fatalf("sequence metadata missing")
+	}
+	if width, ok := meta["width"].(int); !ok || width != 4 {
+		t.Fatalf("expected metadata width 4, got %#v", meta["width"])
+	}
+
+	if _, err := history.Undo(tmp); err != nil {
+		t.Fatalf("undo error: %v", err)
+	}
+}