Add filename.dirname/1

Mohamed Seleem · Mohamed Seleem · commit f39e21c17d51 · 2017-10-22T10:33:02.000+02:00
diff --git a/src/javascript/lib/core/erlang_compat/filename.js b/src/javascript/lib/core/erlang_compat/filename.js
@@ -13,6 +13,14 @@ function join(arg = [], extra = []) {
   }
   return names.reverse().join('/');
 }
+
+function dirname(arg) {
+  const path = join([arg]);
+  const index = path.lastIndexOf('/');
+  return index == -1 ? '.' : path.substr(0, index);
+}
+
 export default {
   join,
+  dirname,
 };
diff --git a/src/javascript/tests/core/erlang_compat/filename_spec.js b/src/javascript/tests/core/erlang_compat/filename_spec.js
@@ -1,6 +1,14 @@
 import test from 'ava';
 import Core from '../../../lib/core';
 
+test('dirname/1', (t) => {
+  let result = Core.filename.dirname('/usr/src/kalle.erl');
+  t.is(result, '/usr/src');
+
+  result = Core.filename.dirname('kalle.erl');
+  t.is(result, '.');
+});
+
 test('join/1', (t) => {
   let result = Core.filename.join(['/usr', 'local', 'bin']);
   t.is(result, '/usr/local/bin');
