git ssb

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const nest = require('depnest')
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const { h, when, send, resolve, Value, computed } = require('mutant')
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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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})
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exports.create = function (api) {
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  return nest('message.html.subject', subject)
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  function subject (msg) {
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    const { subject, text } = msg.value.content
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    if(!(subject || text)) return
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    return api.message.html.markdown(firstLine(subject|| text))
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  }
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  // private
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  function firstLine (text) {
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    if(text.length < 80 && !~text.indexOf('\n')) return text
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    //get the first non-empty line
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    var line = text.trim().split('\n').shift().trim()
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    //always break on a space, so that links are preserved.
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    const leadingMentionsLength = countLeadingMentions(line)
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    const i = line.indexOf(' ', leadingMentionsLength + 80)
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    var sample = line.substring(0, ~i ? i : line.length)
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    const ellipsis = (sample.length < line.length) ? '...' : ''
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    return sample + ellipsis
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  }
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  function countLeadingMentions (str) {
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    return str.match(/^(\s*\[@[^\)]+\)\s*)*/)[0].length
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    // matches any number of pattern " [@...)  " from start of line
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  }
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}
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