Add configurable sequence numbering command

tests/integration/sequence_start_test.go

@@ -0,0 +1,65 @@
+package integration
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/rogeecn/renamer/internal/history"
+	"github.com/rogeecn/renamer/internal/sequence"
+)
+
+func TestSequenceApplyWithStartOffset(t *testing.T) {
+	tmp := t.TempDir()
+
+	createIntegrationFile(t, filepath.Join(tmp, "shotA.exr"))
+	createIntegrationFile(t, filepath.Join(tmp, "shotB.exr"))
+
+	opts := sequence.DefaultOptions()
+	opts.WorkingDir = tmp
+	opts.Start = 10
+
+	plan, err := sequence.Preview(context.Background(), opts, nil)
+	if err != nil {
+		t.Fatalf("preview error: %v", err)
+	}
+
+	expected := []string{"010_shotA.exr", "011_shotB.exr"}
+	if len(plan.Candidates) != len(expected) {
+		t.Fatalf("expected %d candidates, got %d", len(expected), len(plan.Candidates))
+	}
+	for i, candidate := range plan.Candidates {
+		if candidate.ProposedPath != expected[i] {
+			t.Fatalf("candidate %d proposed %s, expected %s", i, candidate.ProposedPath, expected[i])
+		}
+	}
+
+	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, "010_shotA.exr")); err != nil {
+		t.Fatalf("expected renamed file exists: %v", err)
+	}
+	if _, err := os.Stat(filepath.Join(tmp, "011_shotB.exr")); 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 start, ok := meta["start"].(int); !ok || start != 10 {
+		t.Fatalf("expected metadata start 10, got %#v", meta["start"])
+	}
+
+	if _, err := history.Undo(tmp); err != nil {
+		t.Fatalf("undo error: %v", err)
+	}
+}