git ssb

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var nest = require('depnest')
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exports.gives = nest({
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  'unread.sync.isUnread': true,
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  'unread.sync.markRead': true,
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})
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//load current state of unread messages.
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exports.create = function (api) {
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  var unread = null
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  if(localStorage.unread) {
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    try {
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      unread = JSON.parse(localStorage.unread)
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    } catch (err) {}
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  }
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  if(!unread)
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    unread = {timestamp: Date.now()}
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  unread.timestamp = unread.timestamp || Date.now()
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  if(!unread.filter)
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    unread.filter = {}
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  var timer
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  function save () {
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    if(timer) return
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    timer = setTimeout(function () {
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      timer = null
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      console.log('save!', Object.keys(unread.filter).length)
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      localStorage.unread = JSON.stringify(unread)
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    }, 2e3)
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  }
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  function isUnread(msg) {
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    //ignore messages which do not have timestamps
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    if(!msg.timestamp) return false
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    if(msg.timestamp < unread.timestamp) return false
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    return !unread.filter[msg.key]
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  }
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  function markRead(msg) {
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    if(msg && 'string' === typeof msg.key) {
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      if(isUnread(msg)) {
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        unread.filter[msg.key] = true
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        save()
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        return true
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      }
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    }
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  }
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  document.body.onunload = save
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  return nest({
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    'unread.sync.isUnread': isUnread,
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    'unread.sync.markRead': markRead
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  })
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}
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