hexojs/hexo

import { url_for, escapeHTML } from 'hexo-util';
import { postFindOneFactory } from './';
import type Hexo from '../../hexo';

/**
 * Post link tag
 *
 * Syntax:
 *   {% post_link slug | title [title] [escape] %}
 */
export = (ctx: Hexo) => {
  return function postLinkTag(args: string[]) {
    let slug = args.shift();
    if (!slug) {
      throw new Error(`Post not found: "${slug}" doesn't exist for {% post_link %}`);
    }

    let hash = '';
    const parts = slug.split('#');

    if (parts.length === 2) {
      slug = parts[0];
      hash = parts[1];
    }

    let escape = args[args.length - 1];
    if (escape === 'true' || escape === 'false') {
      args.pop();
    } else {
      escape = 'true';
    }

    const factory = postFindOneFactory(ctx);
    const post = factory({ slug }) || factory({ title: slug });
    if (!post) {
      throw new Error(`Post not found: post_link ${slug}.`);
    }

    let title = args.length ? args.join(' ') : post.title || post.slug;
    // Let attribute be the true post title so it appears in tooltip.
    const attrTitle = escapeHTML(post.title || post.slug);
    if (escape === 'true') title = escapeHTML(title);

    const link = url_for.call(ctx, post.path + (hash ? `#${hash}` : ''));

    return `<a href="${link}" title="${attrTitle}">${title}</a>`;
  };
};