feat: add keybinding to open file in editor (#60)

Adds `o` keybinding to open the currently selected file in `$EDITOR`.

Closes #42

Author: pablospe

README.md

@@ -97,6 +97,7 @@ If you want the exact delta configuration I'm using - [it can be found here](htt
 | <kbd>e</kbd>      | Toggle the file tree |
 | <kbd>t</kbd>      | Search/go-to file    |
 | <kbd>y</kbd>      | Copy file path       |
+| <kbd>o</kbd>      | Open file in $EDITOR |
 | <kbd>Tab</kbd>      | Switch focus between the panes       |
 | <kbd>q</kbd>      | Quit                 |
 

pkg/ui/keys.go

@@ -12,6 +12,7 @@ type KeyMap struct {
 	Quit           key.Binding
 	Copy           key.Binding
 	TogglePanel    key.Binding
+	OpenInEditor   key.Binding
 }
 
 var keys = &KeyMap{
@@ -51,6 +52,10 @@ var keys = &KeyMap{
 		key.WithKeys("tab"),
 		key.WithHelp("TAB", "switch panel"),
 	),
+	OpenInEditor: key.NewBinding(
+		key.WithKeys("o"),
+		key.WithHelp("o", "open"),
+	),
 }
 
 func getKeys() []key.Binding {
@@ -63,6 +68,7 @@ func getKeys() []key.Binding {
 		keys.ToggleFileTree,
 		keys.Search,
 		keys.Copy,
+		keys.OpenInEditor,
 		keys.Quit,
 	}
 }

pkg/ui/mainModel.go

@@ -2,6 +2,8 @@ package ui
 
 import (
 	"fmt"
+	"os"
+	"os/exec"
 	"strings"
 
 	"github.com/bluekeyes/go-gitdiff/gitdiff"
@@ -176,6 +178,11 @@ func (m mainModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 				if cmd != nil {
 					cmds = append(cmds, cmd)
 				}
+			case "o":
+				cmd = m.openInEditor()
+				if cmd != nil {
+					cmds = append(cmds, cmd)
+				}
 			}
 
 		case tea.WindowSizeMsg:
@@ -456,6 +463,23 @@ func (m *mainModel) setCursor(cursor int) tea.Cmd {
 	return cmd
 }
 
+func (m mainModel) openInEditor() tea.Cmd {
+	if len(m.files) == 0 {
+		return nil
+	}
+
+	editor := os.Getenv("EDITOR")
+	if editor == "" {
+		return nil
+	}
+
+	filePath := filenode.GetFileName(m.files[m.cursor])
+	c := exec.Command(editor, filePath)
+	return tea.ExecProcess(c, func(err error) tea.Msg {
+		return nil
+	})
+}
+
 func (m mainModel) handleMouse(msg tea.MouseMsg) (tea.Model, tea.Cmd) {
 	// Handle scroll wheel first.
 	if msg.Button == tea.MouseButtonWheelUp || msg.Button == tea.MouseButtonWheelDown {