Supress stderr when TERM is unset

asottile · asottile · commit 7321108083d3 · 2015-08-19T12:02:28.000-07:00
diff --git a/pre_commit/output.py b/pre_commit/output.py
@@ -1,5 +1,6 @@
 from __future__ import unicode_literals
 
+import os
 import subprocess
 import sys
 
@@ -9,9 +10,11 @@
 
 # TODO: smell: import side-effects
 try:
+    if not os.environ.get('TERM'):
+        raise OSError('Cannot determine width without TERM')
     COLS = int(
         subprocess.Popen(
-            ['tput', 'cols'], stdout=subprocess.PIPE,
+            ('tput', 'cols'), stdout=subprocess.PIPE,
         ).communicate()[0] or
         # Default in the case of no terminal
         80
