convert pinboard exported bookmarks json to markdown

bookmarks-json-to-md.js

const fs = require('fs');
const source = require('./pinboard_export.json');
const uniq = (value, index, self) => self.indexOf(value) === index;
let text = '';
source.forEach(bkm => {
    text += `## ${bkm.description}\n`;
    if (bkm.extended) text += `${bkm.extended}\n`
    text += `${bkm.href}\n`
    if (bkm.tags) {
        const tags = bkm.tags.split(' ').map(t => {
            t = t.toLowerCase();
            if (t === 'youtube') return 'video';
            if (t === 'javascript') return 'js';
            if (t === 'hardware') return 'hw';
            if (t === 'programming') return 'dev';
            if (t === 'utility') return 'tool';
            if (t === 'read') return '';
            return t;
        }).filter(t => t.trim()).filter(uniq).sort();
        text += '[' + tags.join('] [') + ']\n';
    }
    text += `_${bkm.time.substr(0, 10)}_\n\n`;
});
fs.writeFileSync('bookmarks.md', text, 'utf8');