diff --git a/ox/file.py b/ox/file.py
index 84372a2..fa809f4 100644
--- a/ox/file.py
+++ b/ox/file.py
@@ -2,18 +2,19 @@
 # vi:si:et:sw=4:sts=4:ts=4
 # GPL 2008
 from __future__ import division, print_function
-import os
+from distutils.spawn import find_executable
+from glob import glob
 import hashlib
+import os
 import re
 import shutil
+import sqlite3
 import struct
 import subprocess
-import sqlite3
-from distutils.spawn import find_executable
 
 from .utils import json
 
-__all__ = ['sha1sum', 'oshash', 'avinfo', 'makedirs']
+__all__ = ['sha1sum', 'oshash', 'avinfo', 'makedirs', 'iexists']
 
 EXTENSIONS = {
     'audio': [
@@ -229,7 +230,7 @@ def ffprobe(filename):
         return value
 
     info = {}
-    if not 'format' in ffinfo:
+    if 'format' not in ffinfo:
         info['error'] = 'badfile'
     else:
         for key in ('duration', 'size', 'bit_rate'):
@@ -368,3 +369,14 @@ def write_path(file):
     path = os.path.split(file)[0]
     if path and not os.path.exists(path):
         os.makedirs(path)
+
+def iexists(path):
+    parts = path.split(os.sep)
+    name = parts[-1].lower()
+    if len(parts) == 1:
+        folder = '.'
+    else:
+        folder = os.path.dirname(path)
+    files = os.listdir(folder)
+    files = {os.path.basename(f).lower() for f in files}
+    return name in files