git ssb

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'use strict'
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var values = require('../sources/values')
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var once = require('../sources/once')
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//convert a stream of arrays or streams into just a stream.
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module.exports = function flatten () {
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  return function (read) {
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    var _read
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    return function (abort, cb) {
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      if (abort) { //abort the current stream, and then stream of streams.
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        _read ? _read(abort, function(err) {
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          read(err || abort, cb)
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        }) : read(abort, cb)
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      }
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      else if(_read) nextChunk()
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      else nextStream()
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      function nextChunk () {
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        _read(null, function (err, data) {
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          if (err === true) nextStream()
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          else if (err) {
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            read(true, function(abortErr) {
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              // TODO: what do we do with the abortErr?
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              cb(err)
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            })
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          }
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          else cb(null, data)
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        })
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      }
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      function nextStream () {
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        _read = null
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        read(null, function (end, stream) {
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          if(end)
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            return cb(end)
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          if(Array.isArray(stream) || stream && 'object' === typeof stream)
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            stream = values(stream)
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          else if('function' != typeof stream)
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            stream = once(stream)
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          _read = stream
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          nextChunk()
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        })
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      }
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    }
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  }
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}
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