git ssb

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var pull = require('pull-stream')
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var sort = require('ssb-sort')
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function asString(val) {
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  return typeof val === 'string' && val
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}
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function linkDest(val) {
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  return val ? asString(val) || asString(val.link) : null
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}
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function defalsify(val) {
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  return val === 'false' ? false : val
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}
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module.exports = function (sbot, id, cb) {
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  var aboutByFeed = {}
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  pull(
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    sbot.links({
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      rel: 'about',
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      dest: id,
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      values: true,
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    }), 
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    pull.drain(function (msg) {
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      var author = msg.value.author
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      var c = msg.value.content
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      if (!c) return
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      var feedAbout = aboutByFeed[author] || (aboutByFeed[author] = {})
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      if (typeof c.name == 'string') feedAbout.name = c.name.replace(/^@?/, '@')
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      if (c.image) feedAbout.image = linkDest(c.image)
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      if (c.description) feedAbout.description = c.description
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      if (c.title) feedAbout.title = c.title
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      if (c.startDateTime) feedAbout.startDateTime = c.startDateTime
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      if (c.publicWebHosting !== undefined && author === c.about) feedAbout.publicWebHosting = defalsify(c.publicWebHosting)
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    }, function (err) {
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      if (err) return cb(err)
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      // Use whatever properties have the most counts.
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      // Usually we would want to handle renames for dead feeds and such,
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      // but for ssb-viewer it is mostly public/archival content anyway,
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      // so we'll let the popular name stand.
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      // Except: prefer the feed's own choices slightly
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      var propValueCounts = {/* prop: {value: count} */}
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      var topValues = {/* prop: value */}
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      var topValueCounts = {/* prop: count */}
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      var about = {}
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      // bias the feed's own choice by 1
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      aboutByFeed._author = aboutByFeed[id] || {}
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      for (var feed in aboutByFeed) {
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        var feedAbout = aboutByFeed[feed]
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        for (var prop in feedAbout) {
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          var value = feedAbout[prop]
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          var valueCounts = propValueCounts[prop] || (propValueCounts[prop] = {})
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          var count = (valueCounts[value] || 0) + 1
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          valueCounts[value] = count
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          if (count > (topValueCounts[prop] || 0)) {
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            topValueCounts[prop] = count
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            topValues[prop] = value
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          }
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        }
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      }
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      if (!topValues.name) topValues.name = String(id).substr(0, 10) + '…'
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      cb(null, topValues)
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    })
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  )
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}
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