[Breaking Change] Skip now accepts FileInfo

Close #40

all_test.go

@@ -150,7 +150,7 @@ func TestOptions_OnSymlink(t *testing.T) {
 }
 
 func TestOptions_Skip(t *testing.T) {
-	opt := Options{Skip: func(src string) (bool, error) {
+	opt := Options{Skip: func(info os.FileInfo, src, dest string) (bool, error) {
 		switch {
 		case strings.HasSuffix(src, "_skip"):
 			return true, nil
@@ -184,7 +184,7 @@ func TestOptions_Skip(t *testing.T) {
 
 	Because(t, "if Skip func returns error, Copy should be interrupted", func(t *testing.T) {
 		errInsideSkipFunc := errors.New("Something wrong inside Skip")
-		opt := Options{Skip: func(src string) (bool, error) {
+		opt := Options{Skip: func(info os.FileInfo, src, dest string) (bool, error) {
 			return false, errInsideSkipFunc
 		}}
 		err := Copy("test/data/case06", "test/data.copy/case06.01", opt)

copy.go

@@ -44,12 +44,14 @@ func switchboard(src, dest string, info os.FileInfo, opt Options) (err error) {
 // Because this "copy" could be called recursively,
 // "info" MUST be given here, NOT nil.
 func copyNextOrSkip(src, dest string, info os.FileInfo, opt Options) error {
-	skip, err := opt.Skip(src)
-	if err != nil {
-		return err
-	}
-	if skip {
-		return nil
+	if opt.Skip != nil {
+		skip, err := opt.Skip(info, src, dest)
+		if err != nil {
+			return err
+		}
+		if skip {
+			return nil
+		}
 	}
 	return switchboard(src, dest, info, opt)
 }

example_test.go

@@ -24,7 +24,7 @@ func ExampleOptions() {
 		"test/data/example",
 		"test/data.copy/example_with_options",
 		Options{
-			Skip: func(src string) (bool, error) {
+			Skip: func(info os.FileInfo, src, dest string) (bool, error) {
 				return strings.HasSuffix(src, ".git-like"), nil
 			},
 			OnSymlink: func(src string) SymlinkAction {

options.go

@@ -12,7 +12,7 @@ type Options struct {
 	OnDirExists func(src, dest string) DirExistsAction
 
 	// Skip can specify which files should be skipped
-	Skip func(src string) (bool, error)
+	Skip func(srcinfo os.FileInfo, src, dest string) (bool, error)
 
 	// AddPermission to every entities,
 	// NO MORE THAN 0777
@@ -83,10 +83,8 @@ func getDefaultOptions(src, dest string) Options {
 		OnSymlink: func(string) SymlinkAction {
 			return Shallow // Do shallow copy
 		},
-		OnDirExists: nil, // Default behavior is "Merge".
-		Skip: func(string) (bool, error) {
-			return false, nil // Don't skip
-		},
+		OnDirExists:       nil,                // Default behavior is "Merge".
+		Skip:              nil,                // Do not skip anything
 		AddPermission:     0,                  // Add nothing
 		PermissionControl: PerservePermission, // Just preserve permission
 		Sync:              false,              // Do not sync