git ssb

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const nest = require('depnest')
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const pull = require('pull-stream')
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const Scroller = require('pull-scroll')
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const { h, when } = require('mutant')
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exports.gives = nest('app.page.channel')
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exports.needs = nest({
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  'app.html.filter': 'first',
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  'app.html.scroller': 'first',
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  'feed.pull.channel': 'first',
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  'message.html.compose': 'first',
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  'message.html.render': 'first',
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  'channel.obs.subscribed': 'first',
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  'keys.sync.id': 'first',
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  'sbot.async.publish': 'first'
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})
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exports.create = function (api) {
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  return nest('app.page.channel', channelView)
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  function channelView (location) {
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    const { channel } = location
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    const channelName = channel.substr(1)
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    const myKey = api.keys.sync.id()
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    var subscribed = api.channel.obs.subscribed(myKey).has(channelName)
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    function toggleSubscription () {
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      api.sbot.async.publish({
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        type: 'channel',
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        channel: channelName,
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        subscribed: !subscribed()
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      })
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    }
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    const subscribeButton = h('Button -subscribe',
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      { 'ev-click': toggleSubscription },
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      when(subscribed, 'Unsubscribe from channel', 'Subscribe to channel')
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    )
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    const composer = api.message.html.compose({ meta: { type: 'post', channel: channelName } })
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    const { filterMenu, filterDownThrough, filterUpThrough, resetFeed } = api.app.html.filter(draw)
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    const { container, content } = api.app.html.scroller({ prepend: [subscribeButton, composer, filterMenu] })
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    function draw () {
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      resetFeed({ container, content })
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      const openChannelSource = api.feed.pull.channel(channelName)
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      pull(
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        openChannelSource({old: false}),
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        filterUpThrough(),
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        Scroller(container, content, api.message.html.render, true, false)
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      )
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      pull(
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        openChannelSource({reverse: true}),
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        filterDownThrough(),
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        Scroller(container, content, api.message.html.render, false, false)
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      )
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    }
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    draw()
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    var page =  h('Page -channel', {title: channel}, [
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      // filterMenu, // TODO - extract non-scroller els like filterMenu here
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      container
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    ]) 
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    // TODO better scroll hack for keyboard shortcuts
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    page.scroll = container.scroll
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    return page
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  }
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}
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