git ssb

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const nest = require('depnest')
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const { computed, Value } = require('mutant')
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const { title } = require('markdown-summary')
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const { isMsg } = require('ssb-ref')
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exports.gives = nest('message.html.subject')
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exports.needs = nest({
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  'message.html.markdown': 'first',
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  'message.sync.unbox': 'first',
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  'sbot.async.get': 'first'
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})
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exports.create = function (api) {
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  var subjectCache = {}
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  return nest('message.html.subject', subject)
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  function subject(msg) {
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    // test if it's a message ref, or a full message object
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    // a message ref is generally passed in if we're fetching the subject of a root message
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    if (isMsg(msg)) {
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      if (subjectCache[msg]) return subjectCache[msg]
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      var subject = Value()
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      api.sbot.async.get(msg, (err, value) => {
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        if (err) throw err
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        try {
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          var _subject = getMsgSubject({ key: msg, value: api.message.sync.unbox(value) })
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          subject.set(_subject)
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          subjectCache[msg] = _subject
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        } catch (n) {
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          subject.set("broken message")
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        }
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      })
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      return subject
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    } else { return getMsgSubject(msg) }
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  }
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  function getMsgSubject(msg) {
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    const { subject, text } = msg.value.content
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    if (!(subject || text)) return
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    return subject
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      ? api.message.html.markdown(subject)
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      : api.message.html.markdown(title(text))
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  }
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}
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