git ssb

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const nest = require('depnest')
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exports.gives = nest({ 'app.sync.goTo': true })
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exports.needs = nest({
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  'app.html.tabs': '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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  'router.async.normalise': 'first',
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  'router.async.router': 'first'
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})
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exports.create = function (api) {
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  return nest('app.sync.goTo', goTo)
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  // TODO consider rolling single arg:
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  //   goTo({ ...location, tmp: { openBackground, split, position } })
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  //
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  // prune `tmp` before pushing into history
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  // allows a refactor of catch-keyboard-shortcut + patch-inbox
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  //   - extracts scrollToMessage into app.page.thread
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  //   - router.sync.router would take (location, { position }) ?
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  function goTo (location, options = {}) {
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    const {
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      openBackground = false,
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      split = false
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    } = options
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    const tabs = api.app.html.tabs()
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    // currently do normalisation here only to generate normalised locationId
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    api.router.async.normalise(location, (err, loc) => {
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      const locationId = api.app.sync.locationId(loc)
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      var page = tabs.get(locationId)
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      if (page) {
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        tabs.select(locationId)
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        api.history.sync.push(loc)
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        return true
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      }
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      api.router.async.router(loc, (err, page) => {
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        if (err) throw err
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        if (!page) return
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        page.id = page.id || locationId
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        tabs.add(page, !openBackground, split)
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        if (openBackground) {
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          const history = api.history.obs.store()
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          var _history = history()
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          var current = _history.pop()
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          history.set([ ..._history, loc, current ])
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        } else {
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          api.history.sync.push(loc)
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        }
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      })
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    })
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  }
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}
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