Add regex command implementation

tests/integration/helpers_test.go

@@ -0,0 +1,8 @@
+package integration
+
+import "os"
+
+func fileExistsTestHelper(path string) bool {
+	_, err := os.Stat(path)
+	return err == nil
+}

tests/integration/regex_conflict_test.go

@@ -0,0 +1,26 @@
+package integration
+
+import (
+	"bytes"
+	"testing"
+
+	renamercmd "github.com/rogeecn/renamer/cmd"
+)
+
+func TestRegexApplyBlocksConflicts(t *testing.T) {
+	t.Parallel()
+
+	tmp := t.TempDir()
+	copyRegexFixtureIntegration(t, "case-fold", tmp)
+
+	cmd := renamercmd.NewRootCommand()
+	var out bytes.Buffer
+	cmd.SetOut(&out)
+	cmd.SetErr(&out)
+	cmd.SetArgs([]string{"regex", "^(.*)$", "conflict", "--yes", "--path", tmp})
+
+	err := cmd.Execute()
+	if err == nil {
+		t.Fatalf("expected error when conflicts are present")
+	}
+}

tests/integration/regex_flow_test.go

@@ -0,0 +1,74 @@
+package integration
+
+import (
+	"bytes"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"testing"
+
+	renamercmd "github.com/rogeecn/renamer/cmd"
+)
+
+func TestRegexPreviewCommand(t *testing.T) {
+	t.Parallel()
+
+	tmp := t.TempDir()
+	copyRegexFixtureIntegration(t, "baseline", tmp)
+
+	var out bytes.Buffer
+	cmd := renamercmd.NewRootCommand()
+	cmd.SetOut(&out)
+	cmd.SetErr(&out)
+	cmd.SetArgs([]string{"regex", "^(\\w+)-(\\d+)", "@2_@1", "--dry-run", "--path", tmp})
+
+	if err := cmd.Execute(); err != nil {
+		t.Fatalf("regex preview command failed: %v\noutput: %s", err, out.String())
+	}
+
+	expected := []string{
+		"alpha-123.log -> 123_alpha.log",
+		"beta-456.log -> 456_beta.log",
+		"gamma-789.log -> 789_gamma.log",
+		"Preview complete: 3 matched, 3 changed, 0 skipped.",
+		"Preview complete. Re-run with --yes to apply.",
+	}
+
+	for _, token := range expected {
+		if !bytes.Contains(out.Bytes(), []byte(token)) {
+			t.Fatalf("expected output to contain %q, got: %s", token, out.String())
+		}
+	}
+}
+
+func copyRegexFixtureIntegration(t *testing.T, name, dest string) {
+	t.Helper()
+	src := filepath.Join("..", "fixtures", "regex", name)
+	if err := filepath.WalkDir(src, func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+		if d.IsDir() {
+			return nil
+		}
+
+		rel, err := filepath.Rel(src, path)
+		if err != nil {
+			return err
+		}
+
+		targetPath := filepath.Join(dest, rel)
+		if err := os.MkdirAll(filepath.Dir(targetPath), 0o755); err != nil {
+			return err
+		}
+
+		content, err := os.ReadFile(path)
+		if err != nil {
+			return err
+		}
+
+		return os.WriteFile(targetPath, content, 0o644)
+	}); err != nil {
+		t.Fatalf("copy regex fixture: %v", err)
+	}
+}

tests/integration/regex_undo_test.go

@@ -0,0 +1,42 @@
+package integration
+
+import (
+	"bytes"
+	"path/filepath"
+	"testing"
+
+	renamercmd "github.com/rogeecn/renamer/cmd"
+)
+
+func TestRegexUndoRestoresAutomationRun(t *testing.T) {
+	t.Parallel()
+
+	tmp := t.TempDir()
+	copyRegexFixtureIntegration(t, "mixed", tmp)
+
+	apply := renamercmd.NewRootCommand()
+	var applyOut bytes.Buffer
+	apply.SetOut(&applyOut)
+	apply.SetErr(&applyOut)
+	apply.SetArgs([]string{"regex", "^build_(\\d+)_(.*)$", "release-@1-@2", "--yes", "--path", tmp})
+	if err := apply.Execute(); err != nil {
+		t.Fatalf("regex apply failed: %v\noutput: %s", err, applyOut.String())
+	}
+
+	if !fileExistsTestHelper(filepath.Join(tmp, "release-101-release.tar.gz")) || !fileExistsTestHelper(filepath.Join(tmp, "release-102-hotfix.tar.gz")) {
+		t.Fatalf("expected renamed files after apply")
+	}
+
+	undo := renamercmd.NewRootCommand()
+	var undoOut bytes.Buffer
+	undo.SetOut(&undoOut)
+	undo.SetErr(&undoOut)
+	undo.SetArgs([]string{"undo", "--path", tmp})
+	if err := undo.Execute(); err != nil {
+		t.Fatalf("undo failed: %v\noutput: %s", err, undoOut.String())
+	}
+
+	if !fileExistsTestHelper(filepath.Join(tmp, "build_101_release.tar.gz")) || !fileExistsTestHelper(filepath.Join(tmp, "build_102_hotfix.tar.gz")) {
+		t.Fatalf("expected originals restored after undo")
+	}
+}

tests/integration/remove_undo_test.go

@@ -2,7 +2,6 @@ package integration
 
 import (
 	"bytes"
-	"os"
 	"path/filepath"
 	"testing"
 
@@ -33,7 +32,7 @@ func TestRemoveCommandAutomationUndo(t *testing.T) {
 		t.Fatalf("apply failed: %v\noutput: %s", err, applyOut.String())
 	}
 
-	if !fileExists(filepath.Join(tmp, "alpha.txt")) || !fileExists(filepath.Join(tmp, "nested", "beta.txt")) {
+	if !fileExistsTestHelper(filepath.Join(tmp, "alpha.txt")) || !fileExistsTestHelper(filepath.Join(tmp, "nested", "beta.txt")) {
 		t.Fatalf("expected files renamed after apply")
 	}
 
@@ -46,12 +45,7 @@ func TestRemoveCommandAutomationUndo(t *testing.T) {
 		t.Fatalf("undo failed: %v\noutput: %s", err, undoOut.String())
 	}
 
-	if !fileExists(filepath.Join(tmp, "alpha copy.txt")) || !fileExists(filepath.Join(tmp, "nested", "beta draft.txt")) {
+	if !fileExistsTestHelper(filepath.Join(tmp, "alpha copy.txt")) || !fileExistsTestHelper(filepath.Join(tmp, "nested", "beta draft.txt")) {
 		t.Fatalf("expected originals restored after undo")
 	}
 }
-
-func fileExists(path string) bool {
-	_, err := os.Stat(path)
-	return err == nil
-}