git ssb

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const nest = require('depnest')
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const { h } = require('mutant')
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const Tabs = require('hypertabs')
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exports.gives = nest({
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  'app.html.tabs': true
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})
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exports.needs = nest({
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  'app.html.connection': 'first',
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  'app.html.menu': 'first',
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  'app.html.searchBar': 'first',
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  'app.sync.goTo': 'first',
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  'app.sync.locationId': 'first',
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  'history.obs.store': 'first',
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  'history.sync.push': 'first'
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})
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exports.create = function (api) {
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  var _tabs
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  return nest({
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    'app.html.tabs': tabs
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  })
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  function tabs ({ initial = [], prepend, append } = {}) {
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    if (_tabs) return _tabs
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    const onSelect = (indexes) => {
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      const { id } = _tabs.get(indexes[0]).content
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      try {
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        var location = JSON.parse(id)
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      } catch (e) {
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        throw new Error('app.html.tabs expects all page ids to be stringified location objects')
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      }
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      api.history.sync.push(location)
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      search.input.value = buildSearchBarTermFromLocation(location)
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    }
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    const onClose = (page) => {
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      var history = api.history.obs.store()
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      const prunedHistory = history().filter(loc => {
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        return api.app.sync.locationId(loc) !== page.id
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      })
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      history.set(prunedHistory)
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    }
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    const search = api.app.html.searchBar()
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    if (append === undefined) {
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      append = h('div.navExtra', [
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        search,
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        api.app.html.connection(),
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        api.app.html.menu()
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      ])
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    }
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    _tabs = Tabs({ onSelect, onClose, prepend, append })
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    _tabs.currentPage = () => {
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      const currentPage = _tabs.get(_tabs.selected[0])
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      return currentPage && currentPage.firstChild
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    }
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    _tabs.nextTab = () => _tabs.currentPage() && _tabs.selectRelative(1)
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    _tabs.previousTab = () => _tabs.currentPage() && _tabs.selectRelative(-1)
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    _tabs.closeCurrentTab = () => { _tabs.currentPage() && _tabs.remove(_tabs.selected[0]) }
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    // # TODO: review - this works but is strange
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    initial.forEach(p => api.app.sync.goTo(p))
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    if (initial[0]) api.app.sync.goTo(initial[0])
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    return _tabs
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  }
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}
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// TODO - move this responsibility out to the searchBar?
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function buildSearchBarTermFromLocation (location) {
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  const { page, query } = location
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  if (page === 'search') return '?' + query
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  const keys = Object.keys(location)
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  if (page && keys.length === 1) return '/' + page
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  if (location.channels) return location.channels.join('+')
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  return keys
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    .map(k => location[k])
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    .join(', ')
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}
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