Add insert command

tests/integration/insert_flow_test.go

@@ -0,0 +1,69 @@
+package integration
+
+import (
+	"bytes"
+	"os"
+	"path/filepath"
+	"testing"
+
+	renamercmd "github.com/rogeecn/renamer/cmd"
+)
+
+func TestInsertCommandFlow(t *testing.T) {
+	t.Parallel()
+
+	tmp := t.TempDir()
+	createInsertFile(t, filepath.Join(tmp, "holiday.jpg"))
+	createInsertFile(t, filepath.Join(tmp, "trip.jpg"))
+
+	var previewOut bytes.Buffer
+	preview := renamercmd.NewRootCommand()
+	preview.SetOut(&previewOut)
+	preview.SetErr(&previewOut)
+	preview.SetArgs([]string{"insert", "3", "_tag", "--dry-run", "--path", tmp})
+
+	if err := preview.Execute(); err != nil {
+		t.Fatalf("preview command failed: %v\noutput: %s", err, previewOut.String())
+	}
+
+	if !contains(t, previewOut.String(), "hol_tagiday.jpg", "tri_tagp.jpg") {
+		t.Fatalf("preview output missing expected inserts: %s", previewOut.String())
+	}
+
+	var applyOut bytes.Buffer
+	apply := renamercmd.NewRootCommand()
+	apply.SetOut(&applyOut)
+	apply.SetErr(&applyOut)
+	apply.SetArgs([]string{"insert", "3", "_tag", "--yes", "--path", tmp})
+
+	if err := apply.Execute(); err != nil {
+		t.Fatalf("apply command failed: %v\noutput: %s", err, applyOut.String())
+	}
+
+	if _, err := os.Stat(filepath.Join(tmp, "hol_tagiday.jpg")); err != nil {
+		t.Fatalf("expected renamed file: %v", err)
+	}
+	if _, err := os.Stat(filepath.Join(tmp, "tri_tagp.jpg")); err != nil {
+		t.Fatalf("expected renamed file: %v", err)
+	}
+}
+
+func contains(t *testing.T, haystack string, expected ...string) bool {
+	t.Helper()
+	for _, s := range expected {
+		if !bytes.Contains([]byte(haystack), []byte(s)) {
+			return false
+		}
+	}
+	return true
+}
+
+func createInsertFile(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)
+	}
+}