git ssb

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const h = require('mutant/h')
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const map = require('mutant/map')
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const computed = require('mutant/computed')
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const when = require('mutant/when')
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const nest = require('depnest')
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const ref = require('ssb-ref')
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exports.needs = nest({
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  'message.obs.backlinks': 'first',
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  'message.obs.name': 'first',
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  'message.async.name': 'first',
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  'sbot.sync.cache': '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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  return nest('message.html.backlinks', function (msg) {
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    if (!ref.isMsg(msg.key)) return []
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    var backlinks = api.message.obs.backlinks(msg.key)
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    var references = computed([backlinks, msg], onlyReferences)
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    return when(computed(references, hasItems),
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      h('MessageBacklinks', [
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        h('header', 'backlinks:'),
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        h('ul', [
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          map(references, (backlink) => {
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            return h('li', [
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              h('a -backlink', { href: backlink.id, title: backlink.id }, api.message.obs.name(backlink.id))
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            ])
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          })
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        ])
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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 hasItems (items, msg) {
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  return (items && items.length)
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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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