refactor: move frontmatter parser into commons package

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

commons/src/note-frontmatter/frontmatter.ts

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+/*
+ * SPDX-FileCopyrightText: 2023 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+import { ISO6391 } from './iso6391.js'
+import { SlideOptions } from './slide-show-options.js'
+
+export type Iso6391Language = (typeof ISO6391)[number]
+
+export type OpenGraph = Record<string, string>
+
+export enum NoteTextDirection {
+  LTR = 'ltr',
+  RTL = 'rtl'
+}
+
+export enum NoteType {
+  DOCUMENT = 'document',
+  SLIDE = 'slide'
+}
+export interface NoteFrontmatter {
+  title: string
+  description: string
+  tags: string[]
+  robots: string
+  lang: Iso6391Language
+  dir: NoteTextDirection
+  newlinesAreBreaks: boolean
+  license: string
+  type: NoteType
+  opengraph: OpenGraph
+  slideOptions: SlideOptions
+}

commons/src/note-frontmatter/iso6391.ts

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+/*
+ * SPDX-FileCopyrightText: 2023 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export const ISO6391 = [
+  'aa',
+  'ab',
+  'af',
+  'am',
+  'ar',
+  'ar-ae',
+  'ar-bh',
+  'ar-dz',
+  'ar-eg',
+  'ar-iq',
+  'ar-jo',
+  'ar-kw',
+  'ar-lb',
+  'ar-ly',
+  'ar-ma',
+  'ar-om',
+  'ar-qa',
+  'ar-sa',
+  'ar-sy',
+  'ar-tn',
+  'ar-ye',
+  'as',
+  'ay',
+  'de',
+  'de-at',
+  'de-ch',
+  'de-li',
+  'de-lu',
+  'div',
+  'dz',
+  'el',
+  'en',
+  'en-au',
+  'en-bz',
+  'en-ca',
+  'en-gb',
+  'en-ie',
+  'en-jm',
+  'en-nz',
+  'en-ph',
+  'en-tt',
+  'en-us',
+  'en-za',
+  'en-zw',
+  'eo',
+  'es',
+  'es-ar',
+  'es-bo',
+  'es-cl',
+  'es-co',
+  'es-cr',
+  'es-do',
+  'es-ec',
+  'es-es',
+  'es-gt',
+  'es-hn',
+  'es-mx',
+  'es-ni',
+  'es-pa',
+  'es-pe',
+  'es-pr',
+  'es-py',
+  'es-sv',
+  'es-us',
+  'es-uy',
+  'es-ve',
+  'et',
+  'eu',
+  'fa',
+  'fi',
+  'fj',
+  'fo',
+  'fr',
+  'fr-be',
+  'fr-ca',
+  'fr-ch',
+  'fr-lu',
+  'fr-mc',
+  'fy',
+  'ga',
+  'gd',
+  'gl',
+  'gn',
+  'gu',
+  'ha',
+  'he',
+  'hi',
+  'hr',
+  'hu',
+  'hy',
+  'ia',
+  'id',
+  'ie',
+  'ik',
+  'in',
+  'is',
+  'it',
+  'it-ch',
+  'iw',
+  'ja',
+  'ji',
+  'jw',
+  'ka',
+  'kk',
+  'kl',
+  'km',
+  'kn',
+  'ko',
+  'kok',
+  'ks',
+  'ku',
+  'ky',
+  'kz',
+  'la',
+  'ln',
+  'lo',
+  'ls',
+  'lt',
+  'lv',
+  'mg',
+  'mi',
+  'mk',
+  'ml',
+  'mn',
+  'mo',
+  'mr',
+  'ms',
+  'mt',
+  'my',
+  'na',
+  'nb-no',
+  'ne',
+  'nl',
+  'nl-be',
+  'nn-no',
+  'no',
+  'oc',
+  'om',
+  'or',
+  'pa',
+  'pl',
+  'ps',
+  'pt',
+  'pt-br',
+  'qu',
+  'rm',
+  'rn',
+  'ro',
+  'ro-md',
+  'ru',
+  'ru-md',
+  'rw',
+  'sa',
+  'sb',
+  'sd',
+  'sg',
+  'sh',
+  'si',
+  'sk',
+  'sl',
+  'sm',
+  'sn',
+  'so',
+  'sq',
+  'sr',
+  'ss',
+  'st',
+  'su',
+  'sv',
+  'sv-fi',
+  'sw',
+  'sx',
+  'syr',
+  'ta',
+  'te',
+  'tg',
+  'th',
+  'ti',
+  'tk',
+  'tl',
+  'tn',
+  'to',
+  'tr',
+  'ts',
+  'tt',
+  'tw',
+  'uk',
+  'ur',
+  'us',
+  'uz',
+  'vi',
+  'vo',
+  'wo',
+  'xh',
+  'yi',
+  'yo',
+  'zh',
+  'zh-cn',
+  'zh-hk',
+  'zh-mo',
+  'zh-sg',
+  'zh-tw',
+  'zu'
+] as const

commons/src/note-frontmatter/slide-show-options.ts

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+/*
+ * SPDX-FileCopyrightText: 2023 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+import type { RevealOptions } from 'reveal.js'
+
+type WantedRevealOptions =
+  | 'autoSlide'
+  | 'autoSlideStoppable'
+  | 'transition'
+  | 'backgroundTransition'
+  | 'slideNumber'
+
+export type SlideOptions = Pick<RevealOptions, WantedRevealOptions>