git ssb

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const nest = require('depnest')
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const pull = require('pull-stream')
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const Scroller = require('mutant-scroll')
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const next = require('pull-next-step')
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exports.gives = nest('app.html.scroller')
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exports.needs = nest({
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  'message.html.render': 'first'
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})
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exports.create = function (api) {
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  return nest('app.html.scroller', createScroller)
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  function createScroller (opts = {}) {
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    const {
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      stream, // TODO - rename this to createStream (rename across app)
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      filter = () => pull.filter((msg) => true),
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      indexProperty = ['timestamp']
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    } = opts
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    const streamToTop = pull(
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      next(stream, { live: true, reverse: false, old: false, limit: 100, property: indexProperty }),
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      filter() // is a pull-stream through
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    )
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    const streamToBottom = pull(
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      next(stream, { live: false, reverse: true, limit: 100, property: indexProperty }),
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      filter()
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    )
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    return Scroller(Object.assign({}, opts, { streamToTop, streamToBottom }))
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    // valid Scroller opts :  see github.com/mixmix/mutant-scroll
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    //   classList = [],
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    //   prepend = [],
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    //   append = [],
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    //   streamToTop,
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    //   streamToBottom,
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    //   render,
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    //   updateTop =  updateTopDefault,
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    //   updateBottom = updateBottomDefault,
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    //   store = MutantArray(),
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    //   cb = (err) => { if (err) throw err }
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  }
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}
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