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103 lines
2.5 KiB
TypeScript
103 lines
2.5 KiB
TypeScript
import * as yaml from 'js-yaml';
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const moment = require('moment');
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export interface FrontMatter {
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created?: Date;
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updated?: Date;
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source_url?: string;
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forum_url?: string;
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tweet?: string;
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// Docusaurus
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sidebar_label?: string;
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sidebar_position?: number;
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date?: string;
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title?: string;
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description?: string;
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image?: string;
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}
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export interface MarkdownAndFrontMatter {
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doc: string;
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header: FrontMatter;
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}
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export const stripOffFrontMatter = (md: string): MarkdownAndFrontMatter => {
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if (md.indexOf('---') !== 0) return { doc: md, header: {} };
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let state = 'start';
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const lines = md.split('\n');
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const docLines: string[] = [];
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const headerLines: string[] = [];
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for (const line of lines) {
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if (state === 'start') {
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if (line !== '---') throw new Error('Expected front matter block to start with "---"');
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state = 'in';
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continue;
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}
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if (state === 'in') {
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if (line === '---') {
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state = 'out';
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continue;
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}
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const propLine = line.trim();
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headerLines.push(propLine);
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}
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if (state === 'out') {
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if (line.trim()) state = 'doc';
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}
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if (state === 'doc') {
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docLines.push(line);
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}
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}
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if (state !== 'doc') throw new Error('Front matter block was not closed with "---"');
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const header: Record<string, any> = yaml.load(headerLines.join('\n'), { schema: yaml.FAILSAFE_SCHEMA });
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if (header.created) header.created = moment(header.created).toDate();
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if (header.updated) header.updated = moment(header.updated).toDate();
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if ('sidebar_position' in header) header.sidebar_position = Number(header.sidebar_position);
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return { header, doc: docLines.join('\n') };
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};
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// ---
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// created: 2021-07-05T09:42:47.000+00:00
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// source_url: https://www.patreon.com/posts/any-ideas-for-53317699
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// ---
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const formatFrontMatterValue = (key: string, value: any) => {
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if (['created', 'updated'].includes(key)) {
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return moment((value as Date)).toISOString();
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} else {
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return value.toString();
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}
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};
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export const compileWithFrontMatter = (md: MarkdownAndFrontMatter): string => {
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const output: string[] = [];
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if (Object.keys(md.header).length) {
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const header = { ...md.header };
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for (const [key, value] of Object.entries(header)) {
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(header as any)[key] = formatFrontMatterValue(key, value);
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}
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const headerString = yaml.dump(header, { noCompatMode: true, schema: yaml.FAILSAFE_SCHEMA, lineWidth: 100000 });
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output.push('---');
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output.push(headerString.trim());
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output.push('---');
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output.push('');
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}
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output.push(md.doc);
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return output.join('\n');
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};
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