🐛 Fix option key

The option key on terminals such as macOS Terminal and iTerm2 sends
special characters and not Esc+. Add support for both types.

There is a limitation that alt+enter cannot be detected so an
alternative keybinding has been added.

README.md

@@ -86,6 +86,24 @@ useful.
 
 ## ⚠️ Limitations [⭡](#committed)
 
+### Option Key
+
+The option key needs to be set to send the `meta` or `esc+` keycode. Terminals such
+as macOS Terminal or iTerm2 may not have this as default. If not set correctly it will
+not be possible to apply a commit.
+
+To make these changes following the instructions below.
+
+| Terminal       | Setting                                                      |
+| :------------- | :----------------------------------------------------------- |
+| macOS Terminal | `Profiles` `Keyboard`<br />![macOS Terminal Keyboard Setting](docs/keyboard-options-macos-terminal.png) |
+| iTerm2         | `Preferences` `Profile ` `Keys`<br />![iTerm2 Keyboard Setting](docs/keyboard-options-iterm2.png) |
+
+The alternative keyboard shortcut  <kbd>⌥ Option</kbd> + <kbd>\\</kbd> can also be used to apply
+a commit.
+
+### Rendering Borders
+
 Terminals render emojis differently and this makes alignment of borders
 complicated and difficult. It is an ongoing process to improve the compatibility
 with terminals. The following list are the terminals that have been tested.
@@ -239,6 +257,7 @@ The global shortcuts can be used within any view.
 | Key Binding                              | Command            |
 | :--------------------------------------- | :----------------- |
 | <kbd>⌥ Option</kbd> + <kbd>⏎ Enter</kbd> | Commit             |
+| <kbd>⌥ Option</kbd> + <kbd>\\</kbd>      | Commit             |
 | <kbd>⌥ Option</kbd> + <kbd>S</kbd>       | Toggle sign-off    |
 | <kbd>⌥ Option</kbd> + <kbd>T</kbd>       | Toggle theme       |
 | <kbd>⌥ Option</kbd> + <kbd>/</kbd>       | Help               |

internal/ui/ui.go

@@ -96,6 +96,18 @@ const (
 	bodyName    = "Body"
 )
 
+const (
+	KeyAmend   = "å"
+	KeyLoad    = "¬"
+	KeySignoff = "ß"
+	KeyTheme   = "†"
+	KeyAuthor  = "¡"
+	KeyEmoji   = "™"
+	KeySummary = "£"
+	KeyBody    = "¢"
+	KeyHelp    = "˙"
+)
+
 func New() Model {
 	return Model{
 		Date: time.Now(),
@@ -228,22 +240,22 @@ func (m Model) View() string {
 
 func (m Model) onKeyPress(msg tea.KeyMsg) keyResponse {
 	switch msg.String() {
-	case "alt+1":
+	case "alt+1", KeyAuthor:
 		if m.focus == authorComponent {
 			return keyResponse{model: m, nilMsg: true}
 		}
 		m.focus = authorComponent
-	case "alt+2":
+	case "alt+2", KeyEmoji:
 		if m.focus == emojiComponent {
 			return keyResponse{model: m, nilMsg: true}
 		}
 		m.focus = emojiComponent
-	case "alt+3":
+	case "alt+3", KeySummary:
 		if m.focus == summaryComponent {
 			return keyResponse{model: m, nilMsg: true}
 		}
 		m.focus = summaryComponent
-	case "alt+4":
+	case "alt+4", KeyBody:
 		if m.focus == bodyComponent {
 			return keyResponse{model: m, nilMsg: true}
 		}
@@ -259,15 +271,15 @@ func (m Model) onKeyPress(msg tea.KeyMsg) keyResponse {
 		case summaryComponent:
 			m.focus = bodyComponent
 		}
-	case "alt+enter":
+	case "alt+enter", "alt+\\":
 		if !m.validate() {
 			break
 		}
 
 		m = m.commit(applyQuit)
 
 		return keyResponse{model: m, cmd: tea.Quit, end: true}
-	case "alt+a":
+	case "alt+a", KeyAmend:
 		m.amend = !m.amend
 
 		m.swapSave()
@@ -276,21 +288,21 @@ func (m Model) onKeyPress(msg tea.KeyMsg) keyResponse {
 		m.models.body.CursorStart()
 
 		return keyResponse{model: m, end: false, nilMsg: true}
-	case "alt+l":
+	case "alt+l", KeyLoad:
 		if m.setSave() {
 			m.models.header.CursorStartSummary()
 			m.models.body.CursorStart()
 		}
 
 		return keyResponse{model: m, end: false, nilMsg: true}
-	case "alt+s":
+	case "alt+s", KeySignoff:
 		m.signoff = !m.signoff
 
 		return keyResponse{model: m, end: false, nilMsg: true}
-	case "alt+t":
+	case "alt+t", KeyTheme:
 		m.state.Theme.NextTint()
 		return keyResponse{model: m, cmd: theme.UpdateTheme, end: true}
-	case "ctrl+h":
+	case "ctrl+h", KeyHelp:
 		if m.focus == helpComponent {
 			m.focus = m.previousFocus
 			break