zenity/internal/osa/scripts/msg.gots

var app = Application.currentApplication()
app.includeStandardAdditions = true
app.activate()

var opts = {}

{{if .Message -}}
  opts.message = {{.Message}}
{{end -}}
{{if .As -}}
  opts.as = {{.As}}
{{end -}}
{{if .Title -}}
  opts.withTitle = {{.Title}}
{{end -}}
{{if .Icon -}}
  opts.withIcon = {{.Icon}}
{{end -}}
{{if .Buttons -}}
  opts.buttons = {{.Buttons}}
{{end -}}
{{if .Default -}}
  opts.defaultButton = {{.Default}}
{{end -}}
{{if .Cancel -}}
  opts.cancelButton = {{.Cancel}}
{{end -}}

var res = app[{{.Operation}}]({{.Text}}, opts).buttonReturned
res === {{.Extra}} ? res : void 0