Enhance click-header event

* Expose the name of the mouse action as $FZF_KEY
* Trigger click-header on mouse up
* Enhanced clickable header for `kill` completion

src/tui/light.go

@@ -626,15 +626,13 @@ func (r *LightRenderer) mouseSequence(sz *int) Event {
 
 	// middle := t & 0b1
 	left := t&0b11 == 0
-
-	// shift := t & 0b100
-	// ctrl := t & 0b1000
-	mod := t&0b1100 > 0
-
-	drag := t&0b100000 > 0
+	ctrl := t&0b10000 > 0
+	alt := t&0b01000 > 0
+	shift := t&0b00100 > 0
+	drag := t&0b100000 > 0 // 32
 
 	if scroll != 0 {
-		return Event{Mouse, 0, &MouseEvent{y, x, scroll, false, false, false, mod}}
+		return Event{Mouse, 0, &MouseEvent{y, x, scroll, false, false, false, ctrl, alt, shift}}
 	}
 
 	double := false
@@ -658,7 +656,7 @@ func (r *LightRenderer) mouseSequence(sz *int) Event {
 			}
 		}
 	}
-	return Event{Mouse, 0, &MouseEvent{y, x, 0, left, down, double, mod}}
+	return Event{Mouse, 0, &MouseEvent{y, x, 0, left, down, double, ctrl, alt, shift}}
 }
 
 func (r *LightRenderer) smcup() {

src/tui/tcell.go

@@ -266,7 +266,11 @@ func (r *FullscreenRenderer) GetChar() Event {
 		// so mouse click is three consecutive events, but the first and last are indistinguishable from movement events (with released buttons)
 		// dragging has same structure, it only repeats the middle (main) event appropriately
 		x, y := ev.Position()
-		mod := ev.Modifiers() != 0
+
+		mod := ev.Modifiers()
+		ctrl := (mod & tcell.ModCtrl) > 0
+		alt := (mod & tcell.ModAlt) > 0
+		shift := (mod & tcell.ModShift) > 0
 
 		// since we dont have mouse down events (unlike LightRenderer), we need to track state in prevButton
 		prevButton, button := _prevMouseButton, ev.Buttons()
@@ -275,9 +279,9 @@ func (r *FullscreenRenderer) GetChar() Event {
 
 		switch {
 		case button&tcell.WheelDown != 0:
-			return Event{Mouse, 0, &MouseEvent{y, x, -1, false, false, false, mod}}
+			return Event{Mouse, 0, &MouseEvent{y, x, -1, false, false, false, ctrl, alt, shift}}
 		case button&tcell.WheelUp != 0:
-			return Event{Mouse, 0, &MouseEvent{y, x, +1, false, false, false, mod}}
+			return Event{Mouse, 0, &MouseEvent{y, x, +1, false, false, false, ctrl, alt, shift}}
 		case button&tcell.Button1 != 0:
 			double := false
 			if !drag {
@@ -300,9 +304,9 @@ func (r *FullscreenRenderer) GetChar() Event {
 				}
 			}
 			// fire single or double click event
-			return Event{Mouse, 0, &MouseEvent{y, x, 0, true, !double, double, mod}}
+			return Event{Mouse, 0, &MouseEvent{y, x, 0, true, !double, double, ctrl, alt, shift}}
 		case button&tcell.Button2 != 0:
-			return Event{Mouse, 0, &MouseEvent{y, x, 0, false, true, false, mod}}
+			return Event{Mouse, 0, &MouseEvent{y, x, 0, false, true, false, ctrl, alt, shift}}
 		default:
 			// double and single taps on Windows don't quite work due to
 			// the console acting on the events and not allowing us
@@ -311,7 +315,11 @@ func (r *FullscreenRenderer) GetChar() Event {
 			down := left || button&tcell.Button3 != 0
 			double := false
 
-			return Event{Mouse, 0, &MouseEvent{y, x, 0, left, down, double, mod}}
+			// No need to report mouse movement events when no button is pressed
+			if drag {
+				return Event{Invalid, 0, nil}
+			}
+			return Event{Mouse, 0, &MouseEvent{y, x, 0, left, down, double, ctrl, alt, shift}}
 		}
 
 		// process keyboard:

src/tui/tui.go

@@ -150,6 +150,10 @@ func (e Event) Comparable() Event {
 }
 
 func (e Event) KeyName() string {
+	if me := e.MouseEvent; me != nil {
+		return me.Name()
+	}
+
 	if e.Type >= Invalid {
 		return ""
 	}
@@ -367,7 +371,37 @@ type MouseEvent struct {
 	Left   bool
 	Down   bool
 	Double bool
-	Mod    bool
+	Ctrl   bool
+	Alt    bool
+	Shift  bool
+}
+
+func (e MouseEvent) Mod() bool {
+	return e.Ctrl || e.Alt || e.Shift
+}
+
+func (e MouseEvent) Name() string {
+	name := ""
+	if e.Down {
+		return name
+	}
+
+	if e.Ctrl {
+		name += "ctrl-"
+	}
+	if e.Alt {
+		name += "alt-"
+	}
+	if e.Shift {
+		name += "shift-"
+	}
+	if e.Double {
+		name += "double-"
+	}
+	if !e.Left {
+		name += "right-"
+	}
+	return name + "click"
 }
 
 type BorderShape int