m.code: stop using stuff removed in docutils 0.21.

The uses were just copypaste from the upstream implementation, and out
of all imports only the error string was used. The documentation
suggests using just str() instead, which is what I do, even though it's
different from what ErrorString actually formatted.

diff --git a/plugins/m/code.py b/plugins/m/code.py
index 31ddb879832104d6ad38ec69ebeebe5999de4d03..031bce58fa5e2bad504a9986284f2f55b0d7a963 100644 (file)
--- a/plugins/m/code.py
+++ b/plugins/m/code.py
@@ -28,7 +28,6 @@ import os.path
 import docutils
 from docutils.parsers import rst
 from docutils.parsers.rst.roles import set_classes
-from docutils.utils.error_reporting import SafeString, ErrorString, locale_encoding
 from docutils.parsers.rst import Directive, directives
 import docutils.parsers.rst.directives.misc
 from docutils import io, nodes, utils, statemachine
@@ -203,7 +202,7 @@ class Include(docutils.parsers.rst.directives.misc.Include):
                               (self.name, SafeString(path)))
         except IOError as error:
             raise self.severe('Problems with "%s" directive path:\n%s.' %
-                      (self.name, ErrorString(error)))
+                      (self.name, str(error)))
         startline = self.options.get('start-line', None)
         endline = self.options.get('end-line', None)
         try:
@@ -214,7 +213,7 @@ class Include(docutils.parsers.rst.directives.misc.Include):
                 rawtext = include_file.read()
         except UnicodeError as error:
             raise self.severe('Problem with "%s" directive:\n%s' %
-                              (self.name, ErrorString(error)))
+                              (self.name, str(error)))
         # start-after/end-before: no restrictions on newlines in match-text,
         # and no restrictions on matching inside lines vs. line boundaries
         after_text = self.options.get('start-after', None)