add ai feature

internal/output/progress.go

@@ -0,0 +1,40 @@
+package output
+
+import (
+	"fmt"
+	"io"
+)
+
+// ProgressReporter prints textual progress for rename operations.
+type ProgressReporter struct {
+	writer io.Writer
+	total  int
+	count  int
+}
+
+// NewProgressReporter constructs a reporter bound to the supplied writer.
+func NewProgressReporter(w io.Writer, total int) *ProgressReporter {
+	if w == nil {
+		w = io.Discard
+	}
+	return &ProgressReporter{writer: w, total: total}
+}
+
+// Step registers a completed operation and prints the progress.
+func (r *ProgressReporter) Step(from, to string) error {
+	if r == nil {
+		return nil
+	}
+	r.count++
+	_, err := fmt.Fprintf(r.writer, "[%d/%d] %s -> %s\n", r.count, r.total, from, to)
+	return err
+}
+
+// Complete emits a summary line after all operations finish.
+func (r *ProgressReporter) Complete() error {
+	if r == nil {
+		return nil
+	}
+	_, err := fmt.Fprintf(r.writer, "Completed %d rename(s).\n", r.count)
+	return err
+}