git ssb

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var pull = require('pull-stream')
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var Highlight = require('highlight.js')
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var u = exports
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u.imgMimes = {
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  png: 'image/png',
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  jpeg: 'image/jpeg',
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  jpg: 'image/jpeg',
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  gif: 'image/gif',
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  tif: 'image/tiff',
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  svg: 'image/svg+xml',
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  bmp: 'image/bmp'
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}
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u.getExtension = function(filename) {
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  return (/\.([^.]+)$/.exec(filename) || [,filename])[1]
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}
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u.readNext = function (fn) {
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  var next
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  return function (end, cb) {
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    if (next) return next(end, cb)
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    fn(function (err, _next) {
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      if (err) return cb(err)
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      next = _next
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      next(null, cb)
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    })
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  }
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}
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u.readOnce = function (fn) {
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  var ended
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  return function (end, cb) {
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    fn(function (err, data) {
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      if (err || ended) return cb(err || ended)
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      ended = true
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      cb(null, data)
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    })
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  }
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}
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u.escape = function (str) {
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  return String(str)
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    .replace(/&/g, '&')
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    .replace(/</g, '&lt;')
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    .replace(/>/g, '&gt;')
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    .replace(/"/g, '&quot;')
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}
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u.encodeLink = function (url) {
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  if (!Array.isArray(url)) url = [url]
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  return '/' + url.map(encodeURIComponent).join('/')
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}
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u.link = function (parts, text, raw, props) {
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  if (text == null) text = parts[parts.length-1]
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  if (!raw) text = u.escape(text)
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  return '<a href="' + u.encodeLink(parts) + '"' +
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    (props ? ' ' + props : '') +
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    '>' + text + '</a>'
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}
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u.timestamp = function (time, req) {
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  time = Number(time)
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  var d = new Date(time)
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  return '<span title="' + time + '">' +
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    d.toLocaleString(req._locale) + '</span>'
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}
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u.nav = function (links, page, after) {
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  return ['<nav>'].concat(
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    links.map(function (link) {
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      var href = typeof link[0] == 'string' ? link[0] : u.encodeLink(link[0])
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      var props = link[2] == page ? ' class="active"' : ''
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      return '<a href="' + href + '"' + props + '>' + link[1] + '</a>'
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    }), after || '', '</nav>').join('')
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}
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u.hiddenInputs = function (values) {
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  return Object.keys(values).map(function (key) {
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    return '<input type="hidden"' +
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      ' name="' + u.escape(key) + '"' +
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      ' value="' + u.escape(values[key]) + '"/>'
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  }).join('')
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}
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u.highlight = function(code, lang) {
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  if (code.length > 100000) return u.escape(code)
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  try {
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    return lang
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      ? Highlight.highlight(lang, code).value
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      : Highlight.highlightAuto(code).value
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  } catch(e) {
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    if (/^Unknown language/.test(e.message))
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      return u.escape(code)
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    throw e
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  }
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}
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u.pre = function (text) {
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  return '<pre>' + u.escape(text) + '</pre>'
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}
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u.json = function (obj) {
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  return u.linkify(u.pre(JSON.stringify(obj, null, 2)))
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}
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u.linkify = function (text) {
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  // regex is from ssb-ref
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  return text.replace(/(@|%|&|&amp;)[A-Za-z0-9\/+]{43}=\.[\w\d]+/g, function (str) {
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    return '<a href="/' + encodeURIComponent(str) + '">' + str + '</a>'
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  })
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}
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u.readObjectString = function (obj, cb) {
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  pull(obj.read, pull.collect(function (err, bufs) {
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    if (err) return cb(err)
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    cb(null, Buffer.concat(bufs, obj.length).toString('utf8'))
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  }))
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}
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u.pullReverse = function () {
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  return function (read) {
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    return u.readNext(function (cb) {
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      pull(read, pull.collect(function (err, items) {
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        cb(err, items && pull.values(items.reverse()))
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      }))
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    })
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  }
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}
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function compareMsgs(a, b) {
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  return (a.value.timestamp - b.value.timestamp) || (a.key - b.key)
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}
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u.pullSort = function (comparator, descending) {
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  return function (read) {
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    return u.readNext(function (cb) {
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      pull(read, pull.collect(function (err, items) {
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        if (err) return cb(err)
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        items.sort(comparator)
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        if (descending) items.reverse()
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        cb(null, pull.values(items))
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      }))
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    })
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  }
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}
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u.sortMsgs = function (descending) {
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  return u.pullSort(compareMsgs, descending)
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}
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u.truncate = function (str, len) {
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  str = String(str)
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  return str.length < len ? str : str.substr(0, len) + '…'
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}
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u.messageTitle = function (msg) {
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  var c = msg.value.content
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  return u.truncate(c.title || c.text || msg.key, 40)
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}
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u.ifModifiedSince = function (req, lastMod) {
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  var ifModSince = req.headers['if-modified-since']
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  if (!ifModSince) return false
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  var d = new Date(ifModSince)
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  return d && Math.floor(d/1000) >= Math.floor(lastMod/1000)
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}
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