git ssb

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'use strict'
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function id (e) { return e }
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var prop = require('../util/prop')
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module.exports = function map (mapper) {
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  if(!mapper) return id
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  mapper = prop(mapper)
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  return function (read) {
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    return function (abort, cb) {
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      read(abort, function (end, data) {
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        try {
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        data = !end ? mapper(data) : null
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        } catch (err) {
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          return read(err, function () {
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            return cb(err)
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          })
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        }
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        cb(end, data)
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      })
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    }
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  }
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}
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