git ssb

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var test = require('tape')
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var hash = require('.')
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var crypto = require('crypto')
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var fs = require('fs')
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var pull = require('pull-stream')
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var toPull = require('stream-to-pull-stream')
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var multicb = require('multicb')
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var path = require('path')
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var gitHash = require('./ext/git')
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var ssbHash = require('./ext/ssb')
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function hashFile(filename, type, encoding, cb) {
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  var shasum = crypto.createHash(type)
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  fs.createReadStream(filename).on('data', function (d) {
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    shasum.update(d)
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  })
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  .on('error', cb)
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  .on('end', function () {
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    cb(null, shasum.digest(encoding))
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  })
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}
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function hashFilePull(filename, type, encoding, cb) {
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  pull(
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    toPull(fs.createReadStream(filename)),
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    hash(type, encoding, cb),
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    pull.drain()
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  )
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}
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test('hash a file', function (t) {
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  var done = multicb({ pluck: 1, spread: true })
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  hashFile(__filename, 'md5', 'hex', done())
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  hashFilePull(__filename, 'md5', 'hex', done())
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  done(function (err, digestNodejs, digestPull) {
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    t.error(err, 'hashes')
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    t.equals(digestPull, digestNodejs, 'hash')
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    t.end()
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  })
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})
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test('git object hash', function (t) {
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  pull(
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    pull.once('asdf\n'),
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    gitHash({type: 'blob', size: 5}, function (err, digest) {
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      t.error(err, 'git hash')
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      t.equals(digest, '8bd6648ed130ac9ece0f89cd9a8fbbfd2608427a', 'hash')
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      t.end()
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    }),
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    pull.drain()
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  )
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})
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test('empty git blob', function (t) {
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  var emptyId = 'e69de29bb2d1d6434b8b29ae775ad8c2e48c5391'
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  pull(
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    pull.empty(),
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    gitHash({type: 'blob', length: 0}, function (err, digest) {
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      t.error(err, 'git hash')
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      t.equals(digest, emptyId, 'blob id')
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      t.end()
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    }),
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    pull.drain()
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  )
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})
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test('ssb blob id', function (t) {
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  var emptyId = '&47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU=.sha256'
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  pull(
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    pull.empty(),
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    ssbHash(function (err, digest) {
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      t.error(err, 'ssb hash')
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      t.equals(digest, emptyId, 'blob id')
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      t.end()
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    }),
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    pull.drain()
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  )
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})
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