Changing the plain text markup language with a menu / keystroke

[draft8]

Open a menu to change to a new plain text syntax:

Drafts Directory: Change markup language

( I personally have this set to ⌘L for keyboard use )

Script step source:

(() => {
    'use strict';

    const
        lg = draft.languageGrammar,
        p = [
            'Taskpaper',
            'Markdown',
            'JavaScript',
            'Plain Text',
            'Simple List',
        ]
        .reduce(
            (a, k) => lg !== k ? (
                a.addButton(k),
                a
            ) : a, // No button needed to keep current setting.
            Object.assign(
                Prompt.create(), {
                    title: 'Change grammar or Cancel',
                    message: lg + ' ->'
                }
            )
        );
    return p.show() ? (
        app.displaySuccessMessage(`${lg} -> ${
                (() => {
                    const g = p.buttonPressed;
                    return (
                      draft.languageGrammar = g,
                      draft.update(),
                      g
                    );
                })()
            }`)
    ) : (
        app.displayInfoMessage(lg),
        lg
    );
})();