ggit/src/commit-per-line.js

Local promise-returning git command wrappers

var la = require('lazy-ass')
var gitBlame = require('./blame')
var check = require('check-more-types')
var q = require('q')
var R = require('ramda')

function toArray (x) {
  return Array.isArray(x) ? x : [x]
}

function zipBlames (filenames, blames) {
  la(check.array(blames), 'blame info', blames)
  console.log('found blame info for', blames.length, 'files')
  la(
    check.sameLength(filenames, blames),
    'mismatch in blame lengths',
    filenames,
    blames
  )

  var lineBlames = blames.map(toArray)
  var fileBlame = R.zipObj(filenames, lineBlames)
  return fileBlame
}

// assumes we are inside folder where filenames make sense
// probably inside git repo folder and filenames are relative
// to the repo's root
function commitForEachLine (filenames) {
  console.log('blames for', filenames)

  var blamePromises = filenames.map(function (name) {
    return R.partial(gitBlame, [name])
  })

  var blameInfo = []
  function keepBlameInfo (chain, fn) {
    return chain.then(fn).then(function (blameForFile) {
      blameInfo.push(blameForFile)
    })
  }

  return blamePromises
    .reduce(keepBlameInfo, q())
    .then(R.always(blameInfo))
    .then(R.partial(zipBlames, [filenames]))
}

module.exports = check.defend(
  commitForEachLine,
  check.arrayOfStrings,
  'need filenames'
)