add back in missing check_output

1 files changed, 21 insertions, 0 deletions

diff --git a/utils.py b/utils.py
index f196359..ecbbf7a 100644
--- a/utils.py
+++ b/utils.py
@@ -299,3 +299,24 @@ class SVG:
 
     def set_stroke_width(self, stroke_width=1.0):
         self._stroke_width = stroke_width
+
+def check_output(command, warning):
+    ''' Workaround for old systems without subprocess.check_output'''
+    if hasattr(subprocess, 'check_output'):
+        try:
+            output = subprocess.check_output(command)
+        except subprocess.CalledProcessError:
+            print(warning)
+            return None
+    else:
+        import commands
+
+        cmd = ''
+        for c in command:
+            cmd += c
+            cmd += ' '
+        (status, output) = commands.getstatusoutput(cmd)
+        if status != 0:
+            print(warning)
+            return None
+    return output