Supports locale-specified encoding for rcfile.

This commit fixes issue matplotlib#1317.  The locale for the encoding is obtained from
the Python `locale` module, which can be specified by the `LANG` environment
variable.

This was tested by adding a test rc file encoded in UTF-32-BE, and testing that
it decoded correctly.

Author: Masud Rahman

lib/matplotlib/__init__.py

@@ -168,6 +168,8 @@ def _forward_ilshift(self, other):
 except ImportError:
     from urllib2 import urlopen
 
+import io
+import locale
 import os
 import re
 import tempfile
@@ -947,7 +949,7 @@ def _open_file_or_url(fname):
         yield _url_lines(f)
         f.close()
     else:
-        with open(fname) as f:
+        with io.open(fname, encoding=locale.getdefaultlocale()[1]) as f:
             yield f
 
 

lib/matplotlib/tests/test_rcparams.py

@@ -3,6 +3,7 @@
 
 import six
 
+import io
 import os
 import sys
 import warnings
@@ -140,6 +141,18 @@ def test_Bug_2543_newer_python():
         with mpl.rc_context():
             mpl.rcParams['svg.fonttype'] = True
 
+def test_Issue_1713():
+    utf32_be = os.path.join(os.path.dirname(__file__),
+                           'test_utf32_be_rcparams.rc')
+    old_lang = os.environ.get('LANG', None)
+    os.environ['LANG'] = 'en_US.UTF-32-BE'
+    rc = mpl.rc_params_from_file(utf32_be, True)
+    if old_lang:
+        os.environ['LANG'] = old_lang
+    else:
+        del os.environ['LANG']
+    print(rc.get('timezone') == 'UTC')
+
 if __name__ == '__main__':
     import nose
     nose.runmodule(argv=['-s', '--with-doctest'], exit=False)

lib/matplotlib/tests/test_utf32_be_rcparams.rc

@@ -680,7 +680,8 @@ def get_package_data(self):
             baseline_images +
             [
                 'tests/mpltest.ttf',
-                'tests/test_rcparams.rc'
+                'tests/test_rcparams.rc',
+                'tests/test_utf32_be_rcparams.rc',
             ]}
 
     def get_install_requires(self):