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'use strict'
const Transform = require('stream').Transform
const Bluebird = require('bluebird')
const fs = require('graceful-fs')
const stat = Bluebird.promisify(fs.stat)
const chmod = Bluebird.promisify(fs.chmod)
const fsWriteStreamAtomic = require('fs-write-stream-atomic')
module.exports.dos2Unix = dos2Unix
function dos2Unix (file) {
return stat(file).then((stats) => {
let previousChunkEndedInCR = false
return new Bluebird((resolve, reject) => {
fs.createReadStream(file)
.on('error', reject)
.pipe(new Transform({
transform: function (chunk, encoding, done) {
let data = chunk.toString()
if (previousChunkEndedInCR) {
data = '\r' + data
}
if (data[data.length - 1] === '\r') {
data = data.slice(0, -1)
previousChunkEndedInCR = true
} else {
previousChunkEndedInCR = false
}
done(null, data.replace(/\r\n/g, '\n'))
},
flush: function (done) {
if (previousChunkEndedInCR) {
this.push('\r')
}
done()
}
}))
.on('error', reject)
.pipe(fsWriteStreamAtomic(file))
.on('error', reject)
.on('finish', function () {
resolve(chmod(file, stats.mode))
})
})
})
}
// could add unix2Dos and legacy Mac functions if need be
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