Add support for alt-{up,down,left,right} keys

Close #1234

man/man1/fzf.1

@@ -21,7 +21,7 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ..
-.TH fzf 1 "Feb 2018" "fzf 0.17.4-devel" "fzf - a command-line fuzzy finder"
+.TH fzf 1 "Apr 2018" "fzf 0.17.4-devel" "fzf - a command-line fuzzy finder"
 
 .SH NAME
 fzf - a command-line fuzzy finder
@@ -464,6 +464,10 @@ e.g. \fBfzf --bind=ctrl-j:accept,ctrl-k:kill-line\fR
     \fIenter\fR       (\fIreturn\fR \fIctrl-m\fR)
     \fIspace\fR
     \fIbspace\fR      (\fIbs\fR)
+    \fIalt-up\fR
+    \fIalt-down\fR
+    \fIalt-left\fR
+    \fIalt-right\fR
     \fIalt-enter\fR
     \fIalt-space\fR
     \fIalt-bspace\fR  (\fIalt-bs\fR)

src/options.go

@@ -410,6 +410,14 @@ func parseKeyChords(str string, message string) map[int]string {
 			chord = tui.AltSlash
 		case "alt-bs", "alt-bspace":
 			chord = tui.AltBS
+		case "alt-up":
+			chord = tui.AltUp
+		case "alt-down":
+			chord = tui.AltDown
+		case "alt-left":
+			chord = tui.AltLeft
+		case "alt-right":
+			chord = tui.AltRight
 		case "tab":
 			chord = tui.Tab
 		case "btab", "shift-tab":

src/tui/light.go

@@ -360,6 +360,11 @@ func (r *LightRenderer) escSequence(sz *int) Event {
 	if r.buffer[1] >= 1 && r.buffer[1] <= 'z'-'a'+1 {
 		return Event{int(CtrlAltA + r.buffer[1] - 1), 0, nil}
 	}
+	alt := false
+	if len(r.buffer) > 2 && r.buffer[1] == ESC {
+		r.buffer = r.buffer[1:]
+		alt = true
+	}
 	switch r.buffer[1] {
 	case 32:
 		return Event{AltSpace, 0, nil}
@@ -380,12 +385,25 @@ func (r *LightRenderer) escSequence(sz *int) Event {
 		*sz = 3
 		switch r.buffer[2] {
 		case 68:
+			if alt {
+				return Event{AltLeft, 0, nil}
+			}
 			return Event{Left, 0, nil}
 		case 67:
+			if alt {
+				// Ugh..
+				return Event{AltRight, 0, nil}
+			}
 			return Event{Right, 0, nil}
 		case 66:
+			if alt {
+				return Event{AltDown, 0, nil}
+			}
 			return Event{Down, 0, nil}
 		case 65:
+			if alt {
+				return Event{AltUp, 0, nil}
+			}
 			return Event{Up, 0, nil}
 		case 90:
 			return Event{BTab, 0, nil}

src/tui/tcell.go

@@ -295,12 +295,24 @@ func (r *FullscreenRenderer) GetChar() Event {
 			return Event{BSpace, 0, nil}
 
 		case tcell.KeyUp:
+			if alt {
+				return Event{AltUp, 0, nil}
+			}
 			return Event{Up, 0, nil}
 		case tcell.KeyDown:
+			if alt {
+				return Event{AltDown, 0, nil}
+			}
 			return Event{Down, 0, nil}
 		case tcell.KeyLeft:
+			if alt {
+				return Event{AltLeft, 0, nil}
+			}
 			return Event{Left, 0, nil}
 		case tcell.KeyRight:
+			if alt {
+				return Event{AltRight, 0, nil}
+			}
 			return Event{Right, 0, nil}
 
 		case tcell.KeyHome:

src/tui/tui.go

@@ -85,6 +85,11 @@ const (
 	AltSlash
 	AltBS
 
+	AltUp
+	AltDown
+	AltLeft
+	AltRight
+
 	Alt0
 )