git ssb

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var { h, when, send } = require('mutant')
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var nest = require('depnest')
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exports.needs = nest({
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  'channel.obs.subscribed': 'first',
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  'message.html.compose': 'first',
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  'channel.sync.normalize': 'first',
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  'feed.html.rollup': 'first',
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  'feed.pull.channel': 'first',
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  'sbot.pull.log': 'first',
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  'message.async.publish': 'first',
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  'keys.sync.id': 'first',
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  'intl.sync.i18n': 'first'
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})
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exports.gives = nest('page.html.render')
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exports.create = function (api) {
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  const i18n = api.intl.sync.i18n
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  return nest('page.html.render', function channel (path) {
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    if (path[0] !== '#') return
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    var channel = api.channel.sync.normalize(path.substr(1))
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    var subscribedChannels = api.channel.obs.subscribed(api.keys.sync.id())
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    var prepend = [
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      h('PageHeading', [
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        h('h1', `#${channel}`),
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        h('div.meta', [
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          when(subscribedChannels.has(channel),
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            h('a.ToggleButton.-unsubscribe', {
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              'href': '#',
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              'title': i18n('Click to unsubscribe'),
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              'ev-click': send(unsubscribe, channel)
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            }, i18n('Subscribed')),
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            h('a.ToggleButton.-subscribe', {
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              'href': '#',
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              'ev-click': send(subscribe, channel)
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            }, i18n('Subscribe'))
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          )
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        ])
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      ]),
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      api.message.html.compose({
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        meta: {type: 'post', channel},
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        placeholder: i18n('Write a message in this channel')
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      })
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    ]
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    return api.feed.html.rollup(api.feed.pull.channel(channel), {
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      prepend,
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      displayFilter: mentionFilter,
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      bumpFilter: mentionFilter
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    })
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    function mentionFilter (msg) {
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      // filter out likes
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      if (msg.value.content.type === 'vote') return false
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      if (api.channel.sync.normalize(msg.value.content.channel) === channel) return true
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      if (Array.isArray(msg.value.content.mentions)) {
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        if (msg.value.content.mentions.some(mention => {
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          return mention && getNormalized(mention.link) === `#${channel}`
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        })) {
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          return 'channel-mention'
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        }
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      }
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    }
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    function getNormalized (link) {
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      if (typeof link === 'string' && link.startsWith('#')) {
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        return `#${api.channel.sync.normalize(link.slice(1))}`
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      }
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    }
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  })
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  function subscribe (id) {
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    // confirm
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    api.message.async.publish({
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      type: 'channel',
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      channel: id,
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      subscribed: true
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    })
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  }
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  function unsubscribe (id) {
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    // confirm
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    api.message.async.publish({
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      type: 'channel',
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      channel: id,
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      subscribed: false
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    })
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  }
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}
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