Patch CodeMirror after `bower install`

bower.json

@@ -5,7 +5,7 @@
     "backbone": "components/backbone#~1.2",
     "bootstrap": "components/bootstrap#~3.3",
     "bootstrap-tour": "0.9.0",
-    "codemirror": "components/codemirror#~5.22",
+    "codemirror": "components/codemirror#~5.22.2",
     "es6-promise": "~1.0",
     "font-awesome": "components/font-awesome#~4.2.0",
     "google-caja": "5669",

setupbase.py

@@ -375,6 +375,15 @@ class Bower(Command):
                 shutil.rmtree(bower_pkg)
             shutil.copytree(npm_pkg, bower_pkg)
 
+    def patch_codemirror(self):
+        """Patch CodeMirror until https://github.com/codemirror/CodeMirror/issues/4454 is resolved"""
+        
+        try:
+            shutil.copyfile('tools/patches/codemirror.js', 'notebook/static/components/codemirror/lib/codemirror.js')
+        except OSError as e:
+            print("Failed to patch codemirror.js: %s" % e, file=sys.stderr)
+            raise
+            
     def run(self):
         if not self.should_run():
             print("bower dependencies up to date")
@@ -398,6 +407,7 @@ class Bower(Command):
             print("Failed to run bower: %s" % e, file=sys.stderr)
             print("You can install js dependencies with `npm install`", file=sys.stderr)
             raise
+        self.patch_codemirror()
         self.npm_components()
         os.utime(self.bower_dir, None)
         # update package data in case this created new files