support setting description in custom command

docs/Custom_Command_Keybindings.md

@@ -10,6 +10,7 @@ customCommands:
   - key: 'a'
     command: "git {{if .SelectedFile.HasUnstagedChanges}} add {{else}} reset {{end}} {{.SelectedFile.Name}}"
     context: 'files'
+    description: 'toggle file staged'
   - key: 'C'
     command: "git commit"
     context: 'global'
@@ -53,6 +54,7 @@ For a given custom command, here are the allowed fields:
 | subprocess | whether you want the command to run in a subprocess (necessary if you want to view the output of the command or provide user input) | no |
 | prompts | a list of prompts that will request user input before running the final command | no |
 | loadingText | text to display while waiting for command to finish | no |
+| description | text to display in the keybindings menu that appears when you press 'x' | no |
 
 ### Contexts
 

pkg/gui/custom_commands.go

@@ -199,6 +199,7 @@ type CustomCommand struct {
 	Subprocess  bool                  `yaml:"subprocess"`
 	Prompts     []CustomCommandPrompt `yaml:"prompts"`
 	LoadingText string                `yaml:"loadingText"`
+	Description string                `yaml:"description"`
 }
 
 func (gui *Gui) GetCustomCommandKeybindings() []*Binding {
@@ -230,13 +231,18 @@ func (gui *Gui) GetCustomCommandKeybindings() []*Binding {
 			contexts = []string{customCommand.Context}
 		}
 
+		description := customCommand.Description
+		if description == "" {
+			description = customCommand.Command
+		}
+
 		bindings = append(bindings, &Binding{
 			ViewName:    viewName,
 			Contexts:    contexts,
 			Key:         gui.getKey(customCommand.Key),
 			Modifier:    gocui.ModNone,
 			Handler:     gui.wrappedHandler(gui.handleCustomCommandKeybinding(customCommand)),
-			Description: customCommand.Command,
+			Description: description,
 		})
 	}