tmpl.go

func tmpl(w io.Writer, text string, data interface{}) {
	t := template.New("top")
	t.Funcs(template.FuncMap{
		"trim": strings.TrimSpace,
		// deref allows to use pointer in templates
		"deref": func(data interface{}) string {
			if reflect.ValueOf(data).IsNil() {
				return ""
			}
			switch vv := data.(type) {
			case *string:
				return *vv
			case *int:
				return fmt.Sprintf("%d", *vv)
			default:
				return fmt.Sprint(vv)
			}
		},
		"localBranch": func(data interface{}) string {
			switch data := data.(type) {
			case string:
				i := strings.Index(data, "origin/")
				if i != -1 {
					return data[7:]
				}
				return data

			default:
				return fmt.Sprint(data)
			}
		},
	},
	)
	template.Must(t.Parse(text))
	if err := t.Execute(w, data); err != nil {
		panic(err)
	}
}