1 files changed, 49 insertions, 0 deletions
diff --git a/deps/npm/lib/utils/convert-line-endings.js b/deps/npm/lib/utils/convert-line-endings.js
new file mode 100644
index 0000000000..b05d328aac
--- /dev/null
+++ b/deps/npm/lib/utils/convert-line-endings.js
@@ -0,0 +1,49 @@
+'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