Add multi cursor support

cmd/micro/action/actions.go

@@ -985,6 +985,13 @@ func (h *BufHandler) SpawnMultiCursorSelect() bool {
 
 // MouseMultiCursor is a mouse action which puts a new cursor at the mouse position
 func (h *BufHandler) MouseMultiCursor(e *tcell.EventMouse) bool {
+	b := h.Buf
+	mx, my := e.Position()
+	mouseLoc := h.Win.GetMouseLoc(buffer.Loc{mx, my})
+	c := buffer.NewCursor(b, mouseLoc)
+	b.AddCursor(c)
+	b.MergeCursors()
+
 	return false
 }
 
@@ -995,10 +1002,15 @@ func (h *BufHandler) SkipMultiCursor() bool {
 
 // RemoveMultiCursor removes the latest multiple cursor
 func (h *BufHandler) RemoveMultiCursor() bool {
+	if h.Buf.NumCursors() > 1 {
+		h.Buf.RemoveCursor(h.Buf.NumCursors() - 1)
+		h.Buf.UpdateCursors()
+	}
 	return false
 }
 
 // RemoveAllMultiCursors removes all cursors except the base cursor
 func (h *BufHandler) RemoveAllMultiCursors() bool {
-	return false
+	h.Buf.ClearCursors()
+	return true
 }

cmd/micro/action/bufhandler.go

@@ -13,15 +13,18 @@ type BufKeyAction func(*BufHandler) bool
 type BufMouseAction func(*BufHandler, *tcell.EventMouse) bool
 
 var BufKeyBindings map[KeyEvent]BufKeyAction
+var BufKeyStrings map[KeyEvent]string
 var BufMouseBindings map[MouseEvent]BufMouseAction
 
 func init() {
 	BufKeyBindings = make(map[KeyEvent]BufKeyAction)
+	BufKeyStrings = make(map[KeyEvent]string)
 	BufMouseBindings = make(map[MouseEvent]BufMouseAction)
 }
 
 func BufMapKey(k KeyEvent, action string) {
 	if f, ok := BufKeyActions[action]; ok {
+		BufKeyStrings[k] = action
 		BufKeyBindings[k] = f
 	} else {
 		util.TermMessage("Error:", action, "does not exist")
@@ -106,16 +109,11 @@ func (h *BufHandler) HandleEvent(event tcell.Event) {
 			mod:  e.Modifiers(),
 			r:    e.Rune(),
 		}
-		cursors := h.Buf.GetCursors()
+
-		for _, c := range cursors {
-			h.Buf.SetCurCursor(c.Num)
-			h.Cursor = c
 		done := h.DoKeyEvent(ke)
 		if !done && e.Key() == tcell.KeyRune {
 			h.DoRuneInsert(e.Rune())
 		}
-		}
-		// TODO: maybe reset curcursor to 0
 	case *tcell.EventMouse:
 		switch e.Buttons() {
 		case tcell.ButtonNone:
@@ -145,17 +143,25 @@ func (h *BufHandler) HandleEvent(event tcell.Event) {
 			btn: e.Buttons(),
 			mod: e.Modifiers(),
 		}
-		cursors := h.Buf.GetCursors()
-		for _, c := range cursors {
-			h.Buf.SetCurCursor(c.Num)
-			h.Cursor = c
 		h.DoMouseEvent(me, e)
 	}
-	}
 }
 
 func (h *BufHandler) DoKeyEvent(e KeyEvent) bool {
 	if action, ok := BufKeyBindings[e]; ok {
+		for _, a := range MultiActions {
+			if a == BufKeyStrings[e] {
+				cursors := h.Buf.GetCursors()
+				for _, c := range cursors {
+					h.Buf.SetCurCursor(c.Num)
+					h.Cursor = c
+					if action(h) {
+						h.Win.Relocate()
+					}
+				}
+				return true
+			}
+		}
 		if action(h) {
 			h.Win.Relocate()
 		}
@@ -175,18 +181,21 @@ func (h *BufHandler) DoMouseEvent(e MouseEvent, te *tcell.EventMouse) bool {
 }
 
 func (h *BufHandler) DoRuneInsert(r rune) {
+	cursors := h.Buf.GetCursors()
+	for _, c := range cursors {
 		// Insert a character
-	if h.Cursor.HasSelection() {
+		if c.HasSelection() {
-		h.Cursor.DeleteSelection()
+			c.DeleteSelection()
-		h.Cursor.ResetSelection()
+			c.ResetSelection()
 		}
 
 		if h.isOverwriteMode {
-		next := h.Cursor.Loc
+			next := c.Loc
 			next.X++
-		h.Buf.Replace(h.Cursor.Loc, next, string(r))
+			h.Buf.Replace(c.Loc, next, string(r))
 		} else {
-		h.Buf.Insert(h.Cursor.Loc, string(r))
+			h.Buf.Insert(c.Loc, string(r))
+		}
 	}
 }
 
@@ -292,3 +301,60 @@ var BufMouseActions = map[string]BufMouseAction{
 	"MousePress":       (*BufHandler).MousePress,
 	"MouseMultiCursor": (*BufHandler).MouseMultiCursor,
 }
+
+const funcPrefixLen = 21 // length of "action.(*BufHandler)."
+
+// MultiActions is a list of actions that should be executed multiple
+// times if there are multiple cursors (one per cursor)
+// Generally actions that modify global editor state like quitting or
+// saving should not be included in this list
+var MultiActions = []string{
+	"CursorUp",
+	"CursorDown",
+	"CursorPageUp",
+	"CursorPageDown",
+	"CursorLeft",
+	"CursorRight",
+	"CursorStart",
+	"CursorEnd",
+	"SelectToStart",
+	"SelectToEnd",
+	"SelectUp",
+	"SelectDown",
+	"SelectLeft",
+	"SelectRight",
+	"WordRight",
+	"WordLeft",
+	"SelectWordRight",
+	"SelectWordLeft",
+	"DeleteWordRight",
+	"DeleteWordLeft",
+	"SelectLine",
+	"SelectToStartOfLine",
+	"SelectToEndOfLine",
+	"ParagraphPrevious",
+	"ParagraphNext",
+	"InsertNewline",
+	"InsertSpace",
+	"Backspace",
+	"Delete",
+	"InsertTab",
+	"FindNext",
+	"FindPrevious",
+	"Cut",
+	"CutLine",
+	"DuplicateLine",
+	"DeleteLine",
+	"MoveLinesUp",
+	"MoveLinesDown",
+	"IndentSelection",
+	"OutdentSelection",
+	"OutdentLine",
+	"Paste",
+	"PastePrimary",
+	"SelectPageUp",
+	"SelectPageDown",
+	"StartOfLine",
+	"EndOfLine",
+	"JumpToMatchingBrace",
+}

cmd/micro/buffer/buffer.go

@@ -236,36 +236,6 @@ func (b *Buffer) ReOpen() error {
 	return err
 }
 
-// SetCursors resets this buffer's cursors to a new list
-func (b *Buffer) SetCursors(c []*Cursor) {
-	b.cursors = c
-}
-
-// SetCurCursor sets the current cursor
-func (b *Buffer) SetCurCursor(n int) {
-	b.curCursor = n
-}
-
-// GetActiveCursor returns the main cursor in this buffer
-func (b *Buffer) GetActiveCursor() *Cursor {
-	return b.cursors[b.curCursor]
-}
-
-// GetCursor returns the nth cursor
-func (b *Buffer) GetCursor(n int) *Cursor {
-	return b.cursors[n]
-}
-
-// GetCursors returns the list of cursors in this buffer
-func (b *Buffer) GetCursors() []*Cursor {
-	return b.cursors
-}
-
-// NumCursors returns the number of cursors
-func (b *Buffer) NumCursors() int {
-	return len(b.cursors)
-}
-
 // LineBytes returns line n as an array of bytes
 func (b *Buffer) LineBytes(n int) []byte {
 	if n >= len(b.lines) || n < 0 {
@@ -429,6 +399,42 @@ func (b *Buffer) IndentString(tabsize int) string {
 	return "\t"
 }
 
+// SetCursors resets this buffer's cursors to a new list
+func (b *Buffer) SetCursors(c []*Cursor) {
+	b.cursors = c
+}
+
+// AddCursor adds a new cursor to the list
+func (b *Buffer) AddCursor(c *Cursor) {
+	b.cursors = append(b.cursors, c)
+	b.UpdateCursors()
+}
+
+// SetCurCursor sets the current cursor
+func (b *Buffer) SetCurCursor(n int) {
+	b.curCursor = n
+}
+
+// GetActiveCursor returns the main cursor in this buffer
+func (b *Buffer) GetActiveCursor() *Cursor {
+	return b.cursors[b.curCursor]
+}
+
+// GetCursor returns the nth cursor
+func (b *Buffer) GetCursor(n int) *Cursor {
+	return b.cursors[n]
+}
+
+// GetCursors returns the list of cursors in this buffer
+func (b *Buffer) GetCursors() []*Cursor {
+	return b.cursors
+}
+
+// NumCursors returns the number of cursors
+func (b *Buffer) NumCursors() int {
+	return len(b.cursors)
+}
+
 // MergeCursors merges any cursors that are at the same position
 // into one cursor
 func (b *Buffer) MergeCursors() {
@@ -464,6 +470,12 @@ func (b *Buffer) UpdateCursors() {
 	}
 }
 
+func (b *Buffer) RemoveCursor(i int) {
+	copy(b.cursors[i:], b.cursors[i+1:])
+	b.cursors[len(b.cursors)-1] = nil
+	b.cursors = b.cursors[:len(b.cursors)-1]
+}
+
 // ClearCursors removes all extra cursors
 func (b *Buffer) ClearCursors() {
 	for i := 1; i < len(b.cursors); i++ {

cmd/micro/display/window.go

@@ -317,7 +317,7 @@ func (w *BufWindow) getStyle(style tcell.Style, bloc buffer.Loc, r rune) (tcell.
 }
 
 func (w *BufWindow) showCursor(x, y int, main bool) {
-	if main {
+	if !main {
 		screen.Screen.ShowCursor(x, y)
 	} else {
 		r, _, _, _ := screen.Screen.GetContent(x, y)
@@ -370,15 +370,18 @@ func (w *BufWindow) displayBuffer() {
 	// this represents the current draw position in the buffer (char positions)
 	bloc := buffer.Loc{X: -1, Y: w.StartLine}
 
-	activeC := b.GetActiveCursor()
+	cursors := b.GetCursors()
 
 	curStyle := config.DefStyle
 	for vloc.Y = 0; vloc.Y < bufHeight; vloc.Y++ {
 		vloc.X = 0
 		if b.Settings["ruler"].(bool) {
 			s := lineNumStyle
-			if bloc.Y == activeC.Y {
+			for _, c := range cursors {
+				if bloc.Y == c.Y {
 					s = curNumStyle
+					break
+				}
 			}
 			w.drawLineNum(s, false, maxLineNumLength, &vloc, &bloc)
 		}
@@ -391,11 +394,12 @@ func (w *BufWindow) displayBuffer() {
 		}
 		bloc.X = bslice
 
-		draw := func(r rune, style tcell.Style) {
+		draw := func(r rune, style tcell.Style, showcursor bool) {
 			if nColsBeforeStart <= 0 {
-				if activeC.HasSelection() &&
+				for _, c := range cursors {
-					(bloc.GreaterEqual(activeC.CurSelection[0]) && bloc.LessThan(activeC.CurSelection[1]) ||
+					if c.HasSelection() &&
-						bloc.LessThan(activeC.CurSelection[0]) && bloc.GreaterEqual(activeC.CurSelection[1])) {
+						(bloc.GreaterEqual(c.CurSelection[0]) && bloc.LessThan(c.CurSelection[1]) ||
+							bloc.LessThan(c.CurSelection[0]) && bloc.GreaterEqual(c.CurSelection[1])) {
 						// The current character is selected
 						style = config.DefStyle.Reverse(true)
 
@@ -405,14 +409,23 @@ func (w *BufWindow) displayBuffer() {
 					}
 
 					if b.Settings["cursorline"].(bool) &&
-					!activeC.HasSelection() && activeC.Y == bloc.Y {
+						!c.HasSelection() && c.Y == bloc.Y {
 						if s, ok := config.Colorscheme["cursor-line"]; ok {
 							fg, _, _ := s.Decompose()
 							style = style.Background(fg)
 						}
 					}
+				}
 
 				screen.Screen.SetContent(w.X+vloc.X, w.Y+vloc.Y, r, nil, style)
+
+				if showcursor {
+					for _, c := range cursors {
+						if c.X == bloc.X && c.Y == bloc.Y {
+							w.showCursor(w.X+vloc.X, w.Y+vloc.Y, true)
+						}
+					}
+				}
 				vloc.X++
 			}
 			nColsBeforeStart--
@@ -422,14 +435,10 @@ func (w *BufWindow) displayBuffer() {
 
 		totalwidth := w.StartCol - nColsBeforeStart
 		for len(line) > 0 {
-			if activeC.X == bloc.X && activeC.Y == bloc.Y {
-				w.showCursor(vloc.X, vloc.Y, true)
-			}
-
 			r, size := utf8.DecodeRune(line)
 			curStyle, _ = w.getStyle(curStyle, bloc, r)
 
-			draw(r, curStyle)
+			draw(r, curStyle, true)
 
 			width := 0
 
@@ -443,15 +452,15 @@ func (w *BufWindow) displayBuffer() {
 				char = '@'
 			}
 
-			bloc.X++
-			line = line[size:]
-
 			// Draw any extra characters either spaces for tabs or @ for incomplete wide runes
 			if width > 1 {
 				for i := 1; i < width; i++ {
-					draw(char, curStyle)
+					draw(char, curStyle, false)
 				}
 			}
+			bloc.X++
+			line = line[size:]
+
 			totalwidth += width
 
 			// If we reach the end of the window then we either stop or we wrap for softwrap
@@ -470,12 +479,10 @@ func (w *BufWindow) displayBuffer() {
 				}
 			}
 		}
-		if activeC.X == bloc.X && activeC.Y == bloc.Y {
-			w.showCursor(vloc.X, vloc.Y, true)
-		}
 
+		for _, c := range cursors {
 			if b.Settings["cursorline"].(bool) &&
-			!activeC.HasSelection() && activeC.Y == bloc.Y {
+				!c.HasSelection() && c.Y == bloc.Y {
 				style := config.DefStyle
 				if s, ok := config.Colorscheme["cursor-line"]; ok {
 					fg, _, _ := s.Decompose()
@@ -485,6 +492,13 @@ func (w *BufWindow) displayBuffer() {
 					screen.Screen.SetContent(i, vloc.Y, ' ', nil, style)
 				}
 			}
+		}
+
+		for _, c := range cursors {
+			if c.X == bloc.X && c.Y == bloc.Y {
+				w.showCursor(w.X+vloc.X, w.Y+vloc.Y, true)
+			}
+		}
 
 		bloc.X = w.StartCol
 		bloc.Y++