git ssb

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var nest = require('depnest')
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var ref = require('ssb-ref')
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var { h, map, computed } = require('mutant')
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exports.needs = nest({
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  'message.sync.root': 'first',
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  'message.obs': {
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    backlinks: 'first',
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    name: 'first',
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    author: 'first'
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  },
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  'profile.html.person': 'first',
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  'intl.sync.i18n': 'first'
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})
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exports.gives = nest('message.html.backlinks')
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exports.create = function (api) {
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  const i18n = api.intl.sync.i18n
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  return nest('message.html.backlinks', function (msg, {includeReferences = true, includeForks = true} = {}) {
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    if (!ref.type(msg.key)) return []
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    var rootId = api.message.sync.root(msg)
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    var backlinks = api.message.obs.backlinks(msg.key)
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    var references = includeReferences ? computed([backlinks, msg], onlyReferences) : []
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    var forks = (includeForks && rootId) ? computed([backlinks, msg], onlyForks) : []
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    return [
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      map(forks, link => {
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        return h('a.backlink', {
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          href: msg.key, anchor: link.id
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        }, [
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          h('strong', [
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            api.profile.html.person(link.author), i18n(' forked this discussion:')
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          ]), ' ',
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          api.message.obs.name(link.id)
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        ])
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      }),
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      map(references, link => {
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        return h('a.backlink', {
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          href: link.id, title: link.id
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        }, [
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          h('strong', [
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            api.profile.html.person(link.author), i18n(' referenced this message:')
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          ]), ' ',
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          api.message.obs.name(link.id)
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        ])
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      })
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    ]
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  })
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  function onlyReferences (backlinks, msg) {
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    return backlinks.filter(link => link.root !== msg.key && !includeOrEqual(link.branch, msg.key))
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  }
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  function onlyForks (backlinks, msg) {
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    return backlinks.filter(link => link.root === msg.key && includeOrEqual(link.branch, msg.key) && api.message.sync.root(msg))
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  }
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}
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function includeOrEqual (valueOrArray, item) {
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  if (Array.isArray(valueOrArray)) {
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    return valueOrArray.includes(item)
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  } else {
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    return valueOrArray === item
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  }
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}
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