tildefriends/apps/ssb/tf-utils.js

import * as linkify from './commonmark-linkify.js';
import * as hashtagify from './commonmark-hashtag.js';

export function markdown(md) {
	var reader = new commonmark.Parser({safe: true});
	var writer = new commonmark.HtmlRenderer();
	var parsed = reader.parse(md || '');
	parsed = linkify.transform(parsed);
	parsed = hashtagify.transform(parsed);
	var walker = parsed.walker();
	var event, node;
	while ((event = walker.next())) {
		node = event.node;
		if (event.entering) {
			if (node.type == 'link') {
				if (node.destination.startsWith('@') &&
					node.destination.endsWith('.ed25519')) {
					node.destination = '#' + node.destination;
				} else if (node.destination.startsWith('%') &&
					node.destination.endsWith('.sha256')) {
					node.destination = '#' + node.destination;
				} else if (node.destination.startsWith('&') &&
					node.destination.endsWith('.sha256')) {
					node.destination = '/' + node.destination + '/view';
				}
			} else if (node.type == 'image') {
				if (node.destination.startsWith('&')) {
					node.destination = '/' + node.destination + '/view';
				}
			}
		}
	}
	return writer.render(parsed);
}

export function human_readable_size(bytes) {
	let v = bytes;
	let u = 'B';
	for (let unit of ['kB', 'MB', 'GB']) {
		if (v > 1024) {
			v /= 1024;
			u = unit;
		} else {
			break;
		}
	}
	return `${Math.round(v * 10) / 10} ${u}`;
}