Add --tty-default=/dev/tty and --no-tty-default option (#4352)

Fix #4242.

Use --no-tty-default, if you want fzf to perform a TTY look-up instead of defaulting to /dev/tty.

src/tui/light.go

@@ -28,7 +28,7 @@ const (
 	maxInputBuffer  = 1024 * 1024
 )
 
-const consoleDevice string = "/dev/tty"
+const DefaultTtyDevice string = "/dev/tty"
 
 var offsetRegexp = regexp.MustCompile("(.*?)\x00?\x1b\\[([0-9]+);([0-9]+)R")
 var offsetRegexpBegin = regexp.MustCompile("^\x1b\\[[0-9]+;[0-9]+R")
@@ -146,8 +146,8 @@ type LightWindow struct {
 	wrapSignWidth int
 }
 
-func NewLightRenderer(ttyin *os.File, theme *ColorTheme, forceBlack bool, mouse bool, tabstop int, clearOnExit bool, fullscreen bool, maxHeightFunc func(int) int) (Renderer, error) {
-	out, err := openTtyOut()
+func NewLightRenderer(ttyDefault string, ttyin *os.File, theme *ColorTheme, forceBlack bool, mouse bool, tabstop int, clearOnExit bool, fullscreen bool, maxHeightFunc func(int) int) (Renderer, error) {
+	out, err := openTtyOut(ttyDefault)
 	if err != nil {
 		out = os.Stderr
 	}
@@ -271,7 +271,7 @@ func (r *LightRenderer) getBytesInternal(buffer []byte, nonblock bool) ([]byte,
 	c, ok := r.getch(nonblock)
 	if !nonblock && !ok {
 		r.Close()
-		return nil, errors.New("failed to read " + consoleDevice)
+		return nil, errors.New("failed to read " + DefaultTtyDevice)
 	}
 
 	retries := 0

src/tui/light_unix.go

@@ -42,26 +42,35 @@ func (r *LightRenderer) closePlatform() {
 	r.ttyout.Close()
 }
 
-func openTty(mode int) (*os.File, error) {
-	in, err := os.OpenFile(consoleDevice, mode, 0)
-	if err != nil {
+func openTty(ttyDefault string, mode int) (*os.File, error) {
+	var in *os.File
+	var err error
+	if len(ttyDefault) > 0 {
+		in, err = os.OpenFile(ttyDefault, mode, 0)
+	}
+	if in == nil || err != nil || ttyDefault != DefaultTtyDevice && !util.IsTty(in) {
 		tty := ttyname()
 		if len(tty) > 0 {
 			if in, err := os.OpenFile(tty, mode, 0); err == nil {
 				return in, nil
 			}
 		}
-		return nil, errors.New("failed to open " + consoleDevice)
+		if ttyDefault != DefaultTtyDevice {
+			if in, err = os.OpenFile(DefaultTtyDevice, mode, 0); err == nil {
+				return in, nil
+			}
+		}
+		return nil, errors.New("failed to open " + DefaultTtyDevice)
 	}
 	return in, nil
 }
 
-func openTtyIn() (*os.File, error) {
-	return openTty(syscall.O_RDONLY)
+func openTtyIn(ttyDefault string) (*os.File, error) {
+	return openTty(ttyDefault, syscall.O_RDONLY)
 }
 
-func openTtyOut() (*os.File, error) {
-	return openTty(syscall.O_WRONLY)
+func openTtyOut(ttyDefault string) (*os.File, error) {
+	return openTty(ttyDefault, syscall.O_WRONLY)
 }
 
 func (r *LightRenderer) setupTerminal() {

src/tui/light_windows.go

@@ -76,12 +76,12 @@ func (r *LightRenderer) closePlatform() {
 	windows.SetConsoleMode(windows.Handle(r.inHandle), r.origStateInput)
 }
 
-func openTtyIn() (*os.File, error) {
+func openTtyIn(ttyDefault string) (*os.File, error) {
 	// not used
 	return nil, nil
 }
 
-func openTtyOut() (*os.File, error) {
+func openTtyOut(ttyDefault string) (*os.File, error) {
 	return os.Stderr, nil
 }
 

src/tui/ttyname_unix.go

@@ -44,11 +44,11 @@ func ttyname() string {
 }
 
 // TtyIn returns terminal device to read user input
-func TtyIn() (*os.File, error) {
-	return openTtyIn()
+func TtyIn(ttyDefault string) (*os.File, error) {
+	return openTtyIn(ttyDefault)
 }
 
 // TtyIn returns terminal device to write to
-func TtyOut() (*os.File, error) {
-	return openTtyOut()
+func TtyOut(ttyDefault string) (*os.File, error) {
+	return openTtyOut(ttyDefault)
 }

src/tui/ttyname_windows.go

@@ -11,11 +11,11 @@ func ttyname() string {
 }
 
 // TtyIn on Windows returns os.Stdin
-func TtyIn() (*os.File, error) {
+func TtyIn(ttyDefault string) (*os.File, error) {
 	return os.Stdin, nil
 }
 
 // TtyOut on Windows returns nil
-func TtyOut() (*os.File, error) {
+func TtyOut(ttyDefault string) (*os.File, error) {
 	return nil, nil
 }