Add ability to add cursors with Ctrl-MouseLeft

With the new code that allows binding mouse buttons this was remarkably
easy to add.

The new binding is:

    "Ctrl-MouseLeft": "MouseMultiCursor"

Note: A number of terminals don't support Ctrl-MouseLeft (macOS
especially) so you might want to rebind to MouseRight or MouseMiddle.

cmd/micro/actions.go

@@ -1869,6 +1869,33 @@ func (v *View) SpawnMultiCursor(usePlugin bool) bool {
 	return false
 }
 
+// MouseMultiCursor is a mouse action which puts a new cursor at the mouse position
+func (v *View) MouseMultiCursor(usePlugin bool, e *tcell.EventMouse) bool {
+	if v.Cursor == &v.Buf.Cursor {
+		if usePlugin && !PreActionCall("SpawnMultiCursorAtMouse", v, e) {
+			return false
+		}
+		x, y := e.Position()
+		x -= v.lineNumOffset - v.leftCol + v.x
+		y += v.Topline - v.y
+
+		c := &Cursor{
+			buf: v.Buf,
+		}
+		v.Cursor = c
+		v.MoveToMouseClick(x, y)
+		v.Relocate()
+		v.Cursor = &v.Buf.Cursor
+
+		v.Buf.cursors = append(v.Buf.cursors, c)
+
+		if usePlugin {
+			PostActionCall("SpawnMultiCursorAtMouse", v)
+		}
+	}
+	return false
+}
+
 // SkipMultiCursor moves the current multiple cursor to the next available position
 func (v *View) SkipMultiCursor(usePlugin bool) bool {
 	cursor := v.Buf.cursors[len(v.Buf.cursors)-1]

cmd/micro/bindings.go

@@ -14,7 +14,8 @@ var mouseBindings map[Key][]func(*View, bool, *tcell.EventMouse) bool
 var helpBinding string
 
 var mouseBindingActions = map[string]func(*View, bool, *tcell.EventMouse) bool{
-	"MousePress": (*View).MousePress,
+	"MousePress":       (*View).MousePress,
+	"MouseMultiCursor": (*View).MouseMultiCursor,
 }
 
 var bindingActions = map[string]func(*View, bool) bool{
@@ -517,6 +518,7 @@ func DefaultBindings() map[string]string {
 		"MouseWheelDown": "ScrollDown",
 		"MouseLeft":      "MousePress",
 		"MouseMiddle":    "PastePrimary",
+		"Ctrl-MouseLeft": "MouseMultiCursor",
 
 		"Alt-n": "SpawnMultiCursor",
 		"Alt-p": "RemoveMultiCursor",

cmd/micro/view.go

@@ -561,7 +561,7 @@ func (v *View) HandleEvent(event tcell.Event) {
 		button := e.Buttons()
 
 		for key, actions := range bindings {
-			if button == key.buttons {
+			if button == key.buttons && e.Modifiers() == key.modifiers {
 				for _, c := range v.Buf.cursors {
 					v.Cursor = c
 					relocate = v.ExecuteActions(actions) || relocate
@@ -571,7 +571,7 @@ func (v *View) HandleEvent(event tcell.Event) {
 		}
 
 		for key, actions := range mouseBindings {
-			if button == key.buttons {
+			if button == key.buttons && e.Modifiers() == key.modifiers {
 				for _, action := range actions {
 					action(v, true, e)
 				}