git ssb

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var crypto = require('crypto')
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var pull = require('pull-stream')
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exports.createHash = function (type) {
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  var hash = crypto.createHash(type)
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  var hasher = pull.through(hash.update.bind(hash))
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  var digest
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  hasher.hash = hash
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  hasher.digest = hash.digest.bind(hash)
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  hasher.readDigest = function (abort, cb) {
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    if (digest) cb(true)
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    else cb(null, digest = hash.digest())
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  }
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  return hasher
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}
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exports.createGitObjectHash = function (objectType, objectLength) {
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  var hasher = exports.createHash('sha1')
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  hasher.hash.update(objectType + ' ' + objectLength + '\0')
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  return hasher
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}
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exports.split2 = function (str, delim) {
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  var i = str.indexOf(delim || ' ')
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  return (i === -1) ? [str, ''] : [
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    str.substr(0, i),
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    str.substr(i + 1)
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  ]
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}
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exports.split3 = function (str) {
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  var args = exports.split2(str)
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  return [args[0]].concat(exports.split2(args[1]))
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}
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