git ssb

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var path = require('path')
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var url = require('url')
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var marked = require('ssb-marked')
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var ref = require('ssb-ref')
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var u = require('./util')
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var emojiNamedCharacters = require('emoji-named-characters')
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// render links to git objects and ssb objects
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var blockRenderer = new marked.Renderer()
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blockRenderer.urltransform = function (href) {
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  if (ref.isLink(href))
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    return u.encodeLink(href)
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  if (/^[0-9a-f]{40}$/.test(href) && this.options.repo)
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    return u.encodeLink([this.options.repo.id, 'commit', href])
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  if (this.options.repo && this.options.rev && this.options.path
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   && !url.parse(href).host && href[0] !== '#')
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    return path.join('/', encodeURIComponent(this.options.repo.id),
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      'blob', this.options.rev, this.options.path.join('/'), href)
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  return href
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}
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blockRenderer.image = function (href, title, text) {
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  href = href.replace(/^&/, '&')
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  var url
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  if (ref.isBlobId(href))
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    url = u.encodeLink(href)
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  else if (/^https?:\/\//.test(href))
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    url = href
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  else if (this.options.repo && this.options.rev && this.options.path)
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    url = path.join('/', encodeURIComponent(this.options.repo.id),
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      'raw', this.options.rev, this.options.path.join('/'), href)
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  else
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    return text
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  return '<img src="' + u.escape(url) + '" alt="' + text + '"' +
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    (title ? ' title="' + title + '"' : '') + '/>'
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}
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blockRenderer.mention = function (preceding, id) {
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  // prevent broken name mention
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  if (id[0] == '@' && !ref.isFeed(id))
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    return (preceding||'') + u.escape(id)
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  return marked.Renderer.prototype.mention.call(this, preceding, id)
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}
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blockRenderer.listitem = function (text, checked) {
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  return '<li>' +
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    (checked === undefined ? '' : '<i>' + (checked ? '☑' : '☐') + '</i> ') +
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    text + '</li>\n'
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}
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function renderEmoji(emoji) {
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  return emoji in emojiNamedCharacters ?
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      '<img src="/emoji/' + encodeURI(emoji) + '.png"'
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      + ' alt=":' + escape(emoji) + ':"'
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      + ' title=":' + escape(emoji) + ':"'
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      + ' class="emoji" height="16" width="16">'
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    : ':' + emoji + ':'
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}
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marked.setOptions({
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  gfm: true,
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  mentions: true,
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  tables: true,
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  breaks: true,
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  pedantic: false,
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  sanitize: true,
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  smartLists: true,
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  smartypants: false,
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  emoji: renderEmoji,
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  highlight: u.highlight,
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  renderer: blockRenderer
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})
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// hack to make git link mentions work
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var mdRules = new marked.InlineLexer(1, marked.defaults).rules
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mdRules.mention =
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  /^(\s)?([@%&][A-Za-z0-9\._\-+=\/]*[A-Za-z0-9_\-+=\/]|[0-9a-f]{40})/
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mdRules.text = /^[\s\S]+?(?=[\\<!\[_*`:~]|https?:\/\/| {2,}\n| [@%&]|[0-9a-f]{40}|$)/
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module.exports = function (text, options, cb) {
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  if (!text) return ''
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  if (typeof text != 'string') text = String(text)
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  if (!options) options = {}
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  else if (options.id) options = {repo: options}
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  if (!options.rev) options.rev = 'HEAD'
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  if (!options.path) options.path = []
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  return marked(text, options, cb)
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}
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