git ssb

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const nest = require('depnest')
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const Url = require('url')
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exports.gives = nest('app.async.catchLinkClick')
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exports.needs = nest({
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  'app.html.externalConfirm': 'first',
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  'app.sync.goTo': 'first',
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  'router.async.normalise': 'first'
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})
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exports.create = function (api) {
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  return nest('app.async.catchLinkClick', catchLinkClick)
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  function catchLinkClick (root, cb = defaultCallback) {
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    root.addEventListener('click', (ev) => {
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      if (ev.target.tagName === 'INPUT' &&
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          (ev.target.type === 'file' || ev.target.type === 'checkbox')) return
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      if (ev.defaultPrevented) return // TODO check this is in the right place
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      ev.preventDefault()
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      ev.stopPropagation()
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      var anchor = null
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      for (var n = ev.target; n.parentNode; n = n.parentNode) {
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        if (n.nodeName === 'A') {
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          anchor = n
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          break
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        }
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      }
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      if (!anchor) return true
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      var href = anchor.getAttribute('href')
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      if (!href || href === '#') return
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      var url = Url.parse(href)
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      var opts = {
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        altKey: ev.altKey,
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        ctrlKey: ev.ctrlKey,
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        metaKey: ev.metaKey,
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        shiftKey: ev.shiftKey,
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        isExternal: !!url.host
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      }
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      cb(href, opts)
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    })
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  }
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  function defaultCallback (link, { ctrlKey, isExternal }) {
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    if (isExternal) return api.app.html.externalConfirm(link)
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    const openBackground = ctrlKey
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    api.router.async.normalise(link, (err, location) => {
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      if (err) throw err
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      if (location) api.app.sync.goTo(location, { openBackground })
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    })
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  }
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}
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