Add ability to delete splits

cmd/micro/actions.go

@@ -768,8 +768,9 @@ func (v *View) Quit() bool {
 	if v.CanClose("Quit anyway? (yes, no, save) ") {
 		v.CloseBuffer()
 		if len(tabs[curTab].views) > 1 {
-			screen.Fini()
-			os.Exit(0)
+			v.splitNode.Delete()
+			tabs[v.TabNum].Cleanup()
+			tabs[v.TabNum].Resize()
 		} else if len(tabs) > 1 {
 			if len(tabs[v.TabNum].views) == 1 {
 				tabs = tabs[:v.TabNum+copy(tabs[v.TabNum:], tabs[v.TabNum+1:])]

cmd/micro/split_tree.go

@@ -92,6 +92,40 @@ func (l *LeafNode) HSplit(buf *Buffer) {
 	}
 }
 
+func (l *LeafNode) Delete() {
+	i := search(l.parent.children, l)
+
+	copy(l.parent.children[i:], l.parent.children[i+1:])
+	l.parent.children[len(l.parent.children)-1] = nil
+	l.parent.children = l.parent.children[:len(l.parent.children)-1]
+
+	tab := tabs[l.parent.tabNum]
+	j := findView(tab.views, l.view)
+	copy(tab.views[j:], tab.views[j+1:])
+	tab.views[len(tab.views)-1] = nil // or the zero value of T
+	tab.views = tab.views[:len(tab.views)-1]
+
+	for i, v := range tab.views {
+		v.Num = i
+	}
+	if tab.curView > 0 {
+		tab.curView--
+	}
+}
+
+func (s *SplitTree) Cleanup() {
+	for i, node := range s.children {
+		if n, ok := node.(*SplitTree); ok {
+			if len(n.children) == 1 {
+				if _, ok := n.children[0].(*LeafNode); ok {
+					s.children[i] = n.children[0]
+				}
+			}
+			n.Cleanup()
+		}
+	}
+}
+
 func (s *SplitTree) ResizeSplits() {
 	for i, node := range s.children {
 		if n, ok := node.(*LeafNode); ok {
@@ -108,6 +142,7 @@ func (s *SplitTree) ResizeSplits() {
 				n.view.y = s.y + n.view.height*i
 				n.view.x = s.x
 			}
+			n.view.matches = Match(n.view)
 		} else if n, ok := node.(*SplitTree); ok {
 			if s.kind == VerticalSplit {
 				n.width = s.width / len(s.children)
@@ -140,6 +175,15 @@ func search(haystack []Node, needle Node) int {
 	return 0
 }
 
+func findView(haystack []*View, needle *View) int {
+	for i, x := range haystack {
+		if x == needle {
+			return i
+		}
+	}
+	return 0
+}
+
 func (s *SplitTree) VSplit(buf *Buffer) {}
 func (s *SplitTree) HSplit(buf *Buffer) {}
 

cmd/micro/tab.go

@@ -42,6 +42,10 @@ func (t *Tab) SetNum(num int) {
 	}
 }
 
+func (t *Tab) Cleanup() {
+	t.tree.Cleanup()
+}
+
 func (t *Tab) Resize() {
 	t.tree.ResizeSplits()
 }