git ssb

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const nest = require('depnest')
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const getAvatar = require('ssb-avatar')
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const ref = require('ssb-ref')
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exports.needs = nest({
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  'sbot.async.get': 'first',
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  'sbot.pull.links': 'first',
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  'keys.sync.id': 'first'
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})
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exports.gives = nest('message.async.name')
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// needs an async version
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exports.create = function (api) {
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  return nest('message.async.name', function (id, cb) {
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    if (!ref.isLink(id)) throw new Error('an id must be specified')
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    var fallbackName = id.substring(0, 10) + '...'
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    api.sbot.async.get(id, function (err, value) {
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      if (err && err.name === 'NotFoundError') {
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        return cb(null, fallbackName + '...(missing)')
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      } else if (value.content.type === 'post' && typeof value.content.text === 'string') {
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        if (value.content.text.trim()) {
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          return cb(null, titleFromMarkdown(value.content.text, 40) || fallbackName)
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        }
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      } else if (typeof value.content.text === 'string') {
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        return cb(null, value.content.type + ': ' + titleFromMarkdown(value.content.text, 30))
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      } else {
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        getAboutName(id, cb)
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      }
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      return cb(null, fallbackName)
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    })
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  })
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  function getAboutName (id, cb) {
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    getAvatar({
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      links: api.sbot.pull.links,
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      get: api.sbot.async.get
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    }, api.keys.sync.id(), id, function (_, avatar) {
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      cb(null, avatar && avatar.name || id.substring(0, 10) + '...')
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    })
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  }
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}
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function titleFromMarkdown (text, max) {
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  text = text.trim().split('\n', 3).join('\n')
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  text = text.replace(/_|`|\*|\#|^\[@.*?\]|\[|\]|\(\S*?\)/g, '').trim()
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  text = text.replace(/\:$/, '')
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  text = text.trim().split('\n', 1)[0].trim()
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  if (text.length > max) {
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    text = text.substring(0, max - 2) + '...'
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  }
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  return text
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}
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