git ssb

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const { heads } = require('ssb-sort')
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const getBacklinks = require('./get-backlinks')
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module.exports = function getHeads (server) {
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  if (arguments.length !== 1 || typeof arguments[0] !== 'object') throw new Error('getHeads needs a server as it\'s first argument!')
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  return function (gathering, cb) {
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    getBacklinks(server)(gathering, (err, backlinks) => {
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      if (err) cb(err)
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      else cb(null, heads([gathering, ...backlinks]))
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    })
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  }
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}
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