Add showkey command

cmd/micro/bindings.go

@@ -4,6 +4,7 @@ import (
 	"io/ioutil"
 	"os"
 	"strings"
+	"unicode"
 
 	"github.com/flynn/json5"
 	"github.com/zyedidia/tcell"
@@ -335,6 +336,7 @@ modSearch:
 	// first.
 	if modifiers&tcell.ModCtrl != 0 {
 		// see if the key is in bindingKeys with the Ctrl prefix.
+		k = string(unicode.ToUpper(rune(k[0]))) + k[1:]
 		if code, ok := bindingKeys["Ctrl"+k]; ok {
 			// It is, we're done.
 			return Key{

cmd/micro/command.go

@@ -37,6 +37,7 @@ func init() {
 		"Set":        Set,
 		"SetLocal":   SetLocal,
 		"Show":       Show,
+		"ShowKey":    ShowKey,
 		"Run":        Run,
 		"Bind":       Bind,
 		"Quit":       Quit,
@@ -94,6 +95,7 @@ func DefaultCommands() map[string]StrCommand {
 		"set":        {"Set", []Completion{OptionCompletion, OptionValueCompletion}},
 		"setlocal":   {"SetLocal", []Completion{OptionCompletion, OptionValueCompletion}},
 		"show":       {"Show", []Completion{OptionCompletion, NoCompletion}},
+		"showkey":    {"ShowKey", []Completion{NoCompletion}},
 		"bind":       {"Bind", []Completion{NoCompletion}},
 		"run":        {"Run", []Completion{NoCompletion}},
 		"quit":       {"Quit", []Completion{NoCompletion}},
@@ -511,6 +513,33 @@ func Show(args []string) {
 	messenger.Message(option)
 }
 
+// ShowKey displays the action that a key is bound to
+func ShowKey(args []string) {
+	if len(args) < 1 {
+		messenger.Error("Please provide a key to show")
+		return
+	}
+
+	key, ok := findKey(args[0])
+	if !ok {
+		messenger.Error(args[0], " is not a valid key")
+		return
+	}
+	if _, ok := bindings[key]; !ok {
+		messenger.Message(args[0], " has no binding")
+	} else {
+		actions := bindings[key]
+		msg := ""
+		for i, a := range actions {
+			msg += FuncName(a)
+			if i != len(actions)-1 {
+				msg += ", "
+			}
+		}
+		messenger.Message(msg)
+	}
+}
+
 // Bind creates a new keybinding
 func Bind(args []string) {
 	if len(args) < 2 {

cmd/micro/plugin.go

@@ -61,6 +61,10 @@ func LuaFunctionBinding(function string) func(*View, bool) bool {
 	}
 }
 
+// LuaFunctionMouseBinding is a function generator which takes the name of a lua function
+// and creates a function that will call that lua function
+// Specifically it creates a function that can be called as a mouse binding because this is used
+// to bind mouse actions to lua functions
 func LuaFunctionMouseBinding(function string) func(*View, bool, *tcell.EventMouse) bool {
 	return func(v *View, _ bool, e *tcell.EventMouse) bool {
 		_, err := Call(function, e)
@@ -114,6 +118,9 @@ func LuaFunctionComplete(function string) func(string) []string {
 	}
 }
 
+// LuaFunctionJob returns a function that will call the given lua function
+// structured as a job call i.e. the job output and arguments are provided
+// to the lua function
 func LuaFunctionJob(function string) func(string, ...string) {
 	return func(output string, args ...string) {
 		_, err := Call(function, unpack(append([]string{output}, args...))...)

runtime/help/commands.md

@@ -85,6 +85,11 @@ Here are the possible commands that you can use.
    the terminal and helps you see which bindings aren't possible and why. This
    is most useful for debugging keybindings.
 
+* `showkey`: Show the action(s) bound to a given key. For example
+   running `> showkey CtrlC` will display `main.(*View).Copy`. Unfortuately
+   showkey does not work well for keys bound to plugin actions. For those
+   it just shows "LuaFunctionBinding."
+
 ---
 
 The following commands are provided by the default plugins: