git ssb

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const nest = require('depnest')
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const { isBlob, isFeed, isMsg } = require('ssb-ref')
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exports.gives = nest('router.sync.router')
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exports.needs = nest('router.sync.routes', 'reduce')
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exports.create = (api) => {
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  var _router = null
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  return nest('router.sync.router', (location) => {
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    if (!_router) {
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      const routes = api.router.sync.routes()
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      _router = buildRouter(routes)
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    }
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    const locationObject = normalise(location)
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    return _router(locationObject)
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  })
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}
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function normalise(location) {
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  if (typeof location === 'object') return location
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  if (isBlob(location)) return { blob: location }
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  if (isChannel(location)) return { channel: location }
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  if (isFeed(location)) return { feed: location }
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  if (isMsg(location)) return { msg: location }
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}
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function isChannel (str) {
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  return typeof str === 'string' && str[0] === '#' && str.length > 1
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}
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function buildRouter (routes) {
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  return (location) => {
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    const route = routes.find(([validator]) => validator(location))
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    // signature of a route is [ routeValidator, routeFunction ]
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    if (route) return route[1](location)
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  }
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}
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