Add 'Unsplit' action and VSplit and HSplit actions

This commit adds the 'Unsplit' action used to close all splits except
the current one.

It also adds the 'VSplit' and 'HSplit' actions which open empty
vertical/horizontal splits so you can bind them to keys.

Closes #228

cmd/micro/actions.go

@@ -1445,6 +1445,55 @@ func (v *View) NextTab(usePlugin bool) bool {
 	return false
 }
 
+// VSplitBinding opens an empty vertical split
+func (v *View) VSplitBinding(usePlugin bool) bool {
+	if usePlugin && !PreActionCall("VSplit", v) {
+		return false
+	}
+
+	v.VSplit(NewBuffer([]byte{}, ""))
+
+	if usePlugin {
+		return PostActionCall("VSplit", v)
+	}
+	return false
+}
+
+// HSplitBinding opens an empty horizontal split
+func (v *View) HSplitBinding(usePlugin bool) bool {
+	if usePlugin && !PreActionCall("HSplit", v) {
+		return false
+	}
+
+	v.HSplit(NewBuffer([]byte{}, ""))
+
+	if usePlugin {
+		return PostActionCall("HSplit", v)
+	}
+	return false
+}
+
+// Unsplit closes all splits in the current tab except the active one
+func (v *View) Unsplit(usePlugin bool) bool {
+	if usePlugin && !PreActionCall("Unsplit", v) {
+		return false
+	}
+
+	curView := tabs[curTab].curView
+	for i := len(tabs[curTab].views) - 1; i >= 0; i-- {
+		view := tabs[curTab].views[i]
+		if view != nil && view.Num != curView {
+			view.Quit(true)
+			// messenger.Message("Quit ", view.Buf.Path)
+		}
+	}
+
+	if usePlugin {
+		return PostActionCall("Unsplit", v)
+	}
+	return false
+}
+
 // NextSplit changes the view to the next split
 func (v *View) NextSplit(usePlugin bool) bool {
 	if usePlugin && !PreActionCall("NextSplit", v) {

cmd/micro/bindings.go

@@ -79,6 +79,9 @@ var bindingActions = map[string]func(*View, bool) bool{
 	"NextTab":             (*View).NextTab,
 	"NextSplit":           (*View).NextSplit,
 	"PreviousSplit":       (*View).PreviousSplit,
+	"Unsplit":             (*View).Unsplit,
+	"VSplit":              (*View).VSplitBinding,
+	"HSplit":              (*View).HSplitBinding,
 	"ToggleMacro":         (*View).ToggleMacro,
 	"PlayMacro":           (*View).PlayMacro,
 

runtime/help/keybindings.md

@@ -187,6 +187,9 @@ AddTab
 PreviousTab
 NextTab
 NextSplit
+Unsplit
+VSplit
+HSplit
 PreviousSplit
 ToggleMacro
 PlayMacro