git ssb

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const nest = require('depnest')
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const ref = require('ssb-ref')
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const computed = require('mutant/computed')
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exports.needs = nest({
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  'keys.sync.id': 'first',
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  'channel.obs.subscribed': 'first',
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})
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exports.gives = nest('channel.obs.isSubscribedTo')
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exports.create = function (api) {
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  var subscriptions = {}
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  var myId
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  return nest('channel.obs.isSubscribedTo', isSubscribedTo)
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  function isSubscribedTo (channel, id) {
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    if (!ref.isFeed(id)) {
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      id = getMyId()
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    }
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    return computed(getSubscriptions(id), (v) => v.has(channel))
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  }
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  //cache getters
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  function getMyId () {
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    if (!myId) myId = api.keys.sync.id()
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    return myId
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  }
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  function getSubscriptions (id) {
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    if (!subscriptions[id]) subscriptions[id] = api.channel.obs.subscribed(id)
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    return subscriptions[id]
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  }
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}
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