Add nano-style key menu option

Use the `keymenu` option (default `off`) to enable. ToggleKeyMenu is
also bound to `Alt-g` and this info is now displayed in the status line.

Closes #829

cmd/micro/actions.go

@@ -1551,6 +1551,25 @@ func (v *View) ToggleHelp(usePlugin bool) bool {
 	return true
 }
 
+// ToggleKeyMenu toggles the keymenu option and resizes all tabs
+func (v *View) ToggleKeyMenu(usePlugin bool) bool {
+	if v.mainCursor() {
+		if usePlugin && !PreActionCall("ToggleBindings", v) {
+			return false
+		}
+
+		globalSettings["keymenu"] = !globalSettings["keymenu"].(bool)
+		for _, tab := range tabs {
+			tab.Resize()
+		}
+
+		if usePlugin {
+			return PostActionCall("ToggleBindings", v)
+		}
+	}
+	return true
+}
+
 // ShellMode opens a terminal to run a shell command
 func (v *View) ShellMode(usePlugin bool) bool {
 	if v.mainCursor() {

cmd/micro/bindings.go

@@ -12,6 +12,7 @@ import (
 var bindings map[Key][]func(*View, bool) bool
 var mouseBindings map[Key][]func(*View, bool, *tcell.EventMouse) bool
 var helpBinding string
+var kmenuBinding string
 
 var mouseBindingActions = map[string]func(*View, bool, *tcell.EventMouse) bool{
 	"MousePress":       (*View).MousePress,
@@ -78,6 +79,7 @@ var bindingActions = map[string]func(*View, bool) bool{
 	"StartOfLine":           (*View).StartOfLine,
 	"EndOfLine":             (*View).EndOfLine,
 	"ToggleHelp":            (*View).ToggleHelp,
+	"ToggleKeyMenu":         (*View).ToggleKeyMenu,
 	"ToggleRuler":           (*View).ToggleRuler,
 	"JumpLine":              (*View).JumpLine,
 	"ClearStatus":           (*View).ClearStatus,
@@ -397,9 +399,15 @@ func BindKey(k, v string) {
 	if v == "ToggleHelp" {
 		helpBinding = k
 	}
+	if v == "ToggleKeyMenu" {
+		kmenuBinding = k
+	}
 	if helpBinding == k && v != "ToggleHelp" {
 		helpBinding = ""
 	}
+	if kmenuBinding == k && v != "ToggleKeyMenu" {
+		kmenuBinding = ""
+	}
 
 	actionNames := strings.Split(v, ",")
 	if actionNames[0] == "UnbindKey" {
@@ -490,6 +498,7 @@ func DefaultBindings() map[string]string {
 		"CtrlPageUp":     "PreviousTab",
 		"CtrlPageDown":   "NextTab",
 		"CtrlG":          "ToggleHelp",
+		"Alt-g":          "ToggleKeyMenu",
 		"CtrlR":          "ToggleRuler",
 		"CtrlL":          "JumpLine",
 		"Delete":         "Delete",
@@ -509,7 +518,6 @@ func DefaultBindings() map[string]string {
 		// "Alt-n": "CursorDown",
 
 		// Integration with file managers
-		"F1":  "ToggleHelp",
 		"F2":  "Save",
 		"F3":  "Find",
 		"F4":  "Quit",

cmd/micro/keymenu.go

@@ -0,0 +1,20 @@
+package main
+
+// DisplayKeyMenu displays the nano-style key menu at the bottom of the screen
+func DisplayKeyMenu() {
+	w, h := screen.Size()
+
+	bot := h - 3
+
+	display := []string{"^Q Quit, ^S Save, ^O Open, ^G Help, ^E Command Bar, ^K Cut Line", "^F Find, ^Z Undo, ^Y Redo, ^A Select All, ^D Duplicate Line, ^T New Tab"}
+
+	for y := 0; y < len(display); y++ {
+		for x := 0; x < w; x++ {
+			if x < len(display[y]) {
+				screen.SetContent(x, bot+y, rune(display[y][x]), nil, defStyle)
+			} else {
+				screen.SetContent(x, bot+y, ' ', nil, defStyle)
+			}
+		}
+	}
+}

cmd/micro/micro.go

@@ -225,6 +225,9 @@ func RedrawAll() {
 	}
 	DisplayTabs()
 	messenger.Display()
+	if globalSettings["keymenu"].(bool) {
+		DisplayKeyMenu()
+	}
 	screen.Show()
 }
 

cmd/micro/settings.go

@@ -204,6 +204,7 @@ func DefaultGlobalSettings() map[string]interface{} {
 		"ignorecase":     false,
 		"indentchar":     " ",
 		"infobar":        true,
+		"keymenu":        false,
 		"mouse":          true,
 		"rmtrailingws":   false,
 		"ruler":          true,
@@ -312,7 +313,7 @@ func SetOption(option, value string) error {
 		}
 	}
 
-	if option == "infobar" {
+	if option == "infobar" || option == "keymenu" {
 		for _, tab := range tabs {
 			tab.Resize()
 		}

cmd/micro/statusline.go

@@ -39,12 +39,24 @@ func (sline *Statusline) Display() {
 	file += " " + sline.view.Buf.Settings["fileformat"].(string)
 
 	rightText := ""
-	if len(helpBinding) > 0 {
+	if len(kmenuBinding) > 0 {
-		rightText = helpBinding + " for help "
+		if globalSettings["keymenu"].(bool) {
-		if sline.view.Type == vtHelp {
+			rightText += kmenuBinding + ": hide bindings"
-			rightText = helpBinding + " to close help "
+		} else {
+			rightText += kmenuBinding + ": show bindings"
 		}
 	}
+	if len(helpBinding) > 0 {
+		if len(kmenuBinding) > 0 {
+			rightText += ", "
+		}
+		if sline.view.Type == vtHelp {
+			rightText += helpBinding + ": close help"
+		} else {
+			rightText += helpBinding + ": open help"
+		}
+	}
+	rightText += " "
 
 	statusLineStyle := defStyle.Reverse(true)
 	if style, ok := colorscheme["statusline"]; ok {

cmd/micro/tab.go

@@ -36,6 +36,9 @@ func NewTabFromView(v *View) *Tab {
 	if globalSettings["infobar"].(bool) {
 		t.tree.height--
 	}
+	if globalSettings["keymenu"].(bool) {
+		t.tree.height -= 2
+	}
 
 	t.Resize()
 
@@ -62,6 +65,9 @@ func (t *Tab) Resize() {
 	if globalSettings["infobar"].(bool) {
 		t.tree.height--
 	}
+	if globalSettings["keymenu"].(bool) {
+		t.tree.height -= 2
+	}
 
 	t.tree.ResizeSplits()
 

runtime/help/options.md

@@ -182,6 +182,11 @@ Here are the options that you can set:
 
     default value: `sudo`
 
+* `keymenu`: display the nano-style key menu at the bottom of the screen. Note that ToggleKeyMenu is bound to
+   `Alt-g` by default and this is displayed in the statusline. To disable this, simply by `Alt-g` to `UnbindKey`.
+
+    default value: `off`
+
 ---
 
 Default plugin options: