1 files changed, 31 insertions, 0 deletions
diff --git a/std/fs/eol.ts b/std/fs/eol.ts
new file mode 100644
index 000000000..55d03fa83
--- /dev/null
+++ b/std/fs/eol.ts
@@ -0,0 +1,31 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+
+/** EndOfLine character enum */
+export enum EOL {
+  LF = "\n",
+  CRLF = "\r\n"
+}
+
+const regDetect = /(?:\r?\n)/g;
+
+/**
+ * Detect the EOL character for string input.
+ * returns null if no newline
+ */
+export function detect(content: string): EOL | null {
+  const d = content.match(regDetect);
+  if (!d || d.length === 0) {
+    return null;
+  }
+  const crlf = d.filter((x: string): boolean => x === EOL.CRLF);
+  if (crlf.length > 0) {
+    return EOL.CRLF;
+  } else {
+    return EOL.LF;
+  }
+}
+
+/** Format the file to the targeted EOL */
+export function format(content: string, eol: EOL): string {
+  return content.replace(regDetect, eol);
+}