feat: implement remove command with sequential removals

tests/integration/remove_validation_test.go

@@ -0,0 +1,62 @@
+package integration
+
+import (
+	"bytes"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	renamercmd "github.com/rogeecn/renamer/cmd"
+)
+
+func TestRemoveCommandEmptyBasenameWarning(t *testing.T) {
+	tmp := t.TempDir()
+
+	createValidationFile(t, filepath.Join(tmp, "draft"))
+	createValidationFile(t, filepath.Join(tmp, "draft copy.txt"))
+
+	root := renamercmd.NewRootCommand()
+	var out bytes.Buffer
+	root.SetOut(&out)
+	root.SetErr(&out)
+	root.SetArgs([]string{"remove", "draft", "--path", tmp, "--dry-run"})
+
+	if err := root.Execute(); err != nil {
+		t.Fatalf("remove dry-run failed: %v\noutput: %s", err, out.String())
+	}
+
+	if !strings.Contains(out.String(), "Warning: draft would become empty; skipping") {
+		t.Fatalf("expected empty basename warning, got: %s", out.String())
+	}
+}
+
+func TestRemoveCommandDuplicateWarning(t *testing.T) {
+	tmp := t.TempDir()
+
+	createValidationFile(t, filepath.Join(tmp, "foo draft draft.txt"))
+
+	root := renamercmd.NewRootCommand()
+	var out bytes.Buffer
+	root.SetOut(&out)
+	root.SetErr(&out)
+	root.SetArgs([]string{"remove", " draft", " draft", "--path", tmp, "--dry-run"})
+
+	if err := root.Execute(); err != nil {
+		t.Fatalf("remove dry-run failed: %v\noutput: %s", err, out.String())
+	}
+
+	if !strings.Contains(out.String(), "Warning: token \" draft\" provided multiple times") {
+		t.Fatalf("expected duplicate warning, got: %s", out.String())
+	}
+}
+
+func createValidationFile(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)
+	}
+}