mimeo $MIMEO mimetype determination patch

--- Mimeo.py	2012-06-02 15:26:00.000000000 +0100
+++ Mimeo_patched.py	2012-06-05 17:21:15.000000000 +0100
@@ -722,11 +722,23 @@ class Mimeo():
     if os.path.isdir(rpath):
       return DIRECTORY_MIMETYPE
     elif os.path.isfile(rpath):
-      mimetype = mimetypes.guess_type(rpath)[0]
-      if not mimetype:
-        proc = subprocess.Popen(['file',  '--mime-type', rpath], stdout=subprocess.PIPE)
+      method = os.getenv("MIMEO")
+      if not method:
+        method = "python"
+      if 'file' in method:
+        proc = subprocess.Popen(['file', '--mime-type', rpath], stdout=subprocess.PIPE)
+        output = proc.communicate()[0]
+        mimetype = output[len(rpath)+2:].rstrip()
+      elif 'mimetype' in method:
+        proc = subprocess.Popen(['mimetype', '-i', rpath], stdout=subprocess.PIPE)
         output = proc.communicate()[0]
         mimetype = output[len(rpath)+2:].rstrip()
+      elif 'rox' in method:
+        proc = subprocess.Popen(['rox', '-m', rpath], stdout=subprocess.PIPE)
+        output = proc.communicate()[0]
+        mimetype = output[0:].rstrip()
+      else:
+        mimetype = mimetypes.guess_type(rpath)[0]
       if not mimetype:
         self.error_msg("error: failed to detect MIME-type of %s" % arg)
       return mimetype
@@ -2026,7 +2038,7 @@ def main():



-  conf_group = parser.add_argument_group('Configuration', 'Various configuration options.')
+  conf_group = parser.add_argument_group('Configuration', 'Various configuration options. Optionally, set the environment variable \'MIMEO\' to contain one of the following command names which will be used to determine MIME-types (assuming the relevant packages are installed): file, mimetype, rox. If none is specified, Python\'s \'mimetypes\' module is used instead.')
   conf_group.add_argument('-a', '--assoc', dest='assoc', metavar='<filepath>', action='append',
                     help='Specify a file that associates regular expressions with custom commands. This can be used for opening URLs, for example. See "--assoc-help" for details.')