Implemented a "back" function in issue view widget

tui.go

@@ -537,6 +537,8 @@ func (i Issue) update(msg tea.Msg) (widget, tea.Cmd) {
 		switch msg.String() {
 		case "e":
 			cmds = append(cmds, i.edit)
+		case "esc":
+			cmds = append(cmds, i.back)
 		}
 	}
 	return i, tea.Batch(cmds...)
@@ -544,6 +546,15 @@ func (i Issue) update(msg tea.Msg) (widget, tea.Cmd) {
 
 func (i Issue) edit() tea.Msg { return newEditWidget(i.Path) }
 
+func (i Issue) back() tea.Msg {
+	remainder, _ := filepath.Split(i.Path)
+	remainder = strings.TrimRight(remainder, "/")
+	if len(remainder) == 0 {
+		return nil
+	}
+	return loadPath(remainder)
+}
+
 // render cmd for Issue widget
 func (i Issue) render() tea.Msg {
 	var output string
@@ -586,7 +597,12 @@ func (i Issue) render() tea.Msg {
 // keyhelp cmd for Issue widget
 func (i Issue) keyhelp() string {
 	var output string
-	output = output + "\ne: edit issue\t\tctrl+c: quit"
+	var escStr string
+	remainder, _ := filepath.Split(i.Path)
+	if IsIssueCollection(remainder) {
+		escStr = "\t\tesc: back"
+	}
+	output = output + fmt.Sprintf("\ne: edit issue%s\t\tctrl+c: quit", escStr)
 	return output
 }