git ssb

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var { h } = require('mutant')
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var nest = require('depnest')
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exports.needs = nest({
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  'feed.pull.type': 'first',
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  'feed.html.rollup': 'first',
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  'feed.pull.public': 'first',
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  'gathering.sheet.edit': 'first',
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  'keys.sync.id': 'first',
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  'contact.obs.following': 'first',
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  'sbot.pull.stream': '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 !== '/gatherings') return
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    var id = api.keys.sync.id()
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    var following = api.contact.obs.following(id)
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    var prepend = [
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      h('PageHeading', [
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        h('h1', [h('strong', i18n('Gatherings'))]),
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        h('div.meta', [
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          h('button -add', {
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            'ev-click': createGathering
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          }, i18n('+ Add Gathering'))
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        ])
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      ])
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    ]
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    return api.feed.html.rollup(api.feed.pull.type('gathering'), {
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      prepend,
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      rootFilter: (msg) => isGathering(msg),
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      bumpFilter: (msg) => {
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        if (isGathering(msg)) {
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          return true
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        } else if (followsAuthor(following, id, msg) && isAttendee(msg)) {
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          return 'attending'
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        }
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      },
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      resultFilter: (msg) => followsAuthor(following, id, msg) || followingIsAttending(following, msg),
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      updateStream: api.sbot.pull.stream(sbot => sbot.patchwork.latest({ids: [id]}))
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    })
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  })
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  function createGathering () {
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    api.gathering.sheet.edit()
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  }
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}
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function followsAuthor (following, yourId, msg) {
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  var author = msg.value.author
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  return yourId === author || following().includes(author)
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}
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function followingIsAttending (following, msg) {
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  if (Array.isArray(msg.replies)) {
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    return msg.replies.some((reply) => isAttendee(reply) && following().includes(reply.value.author))
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  }
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}
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function isAttendee (msg) {
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  var content = msg.value && msg.value.content
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  return (content && content.type === 'about' && content.attendee && !content.attendee.remove)
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}
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function isGathering (msg) {
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  return (msg.value && msg.value.content && msg.value.content.type === 'gathering')
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}