Alex/add latex compiler key

CHANGELOG.rst

@@ -16,6 +16,9 @@ Blades: Disallow users to enter video url's in http.
 
 LMS: Improve the acessibility of the forum follow post buttons.
 
+Blades: Latex problems are now enabled via use_latex_compiler
+key in course settings. (BLD-426)
+
 Blades: Fix bug when the speed can only be changed when the video is playing.
 
 LMS: Change bulk email implementation to use less memory, and to better handle

cms/djangoapps/contentstore/features/component.feature

@@ -19,11 +19,19 @@ Feature: CMS.Component Adding
            | Component               |
            | Text                    |
            | Announcement            |
-           | E-text Written in LaTeX |
        Then I see HTML components in this order:
            | Component               |
            | Text                    |
            | Announcement            |
+
+    Scenario: I can add Latex HTML components
+       Given I am in Studio editing a new unit
+       Given I have enabled latex compiler
+       When I add this type of HTML component:
+           | Component               |
+           | E-text Written in LaTeX |
+       Then I see HTML components in this order:
+           | Component               |
            | E-text Written in LaTeX |
 
     Scenario: I can add Common Problem components
@@ -58,9 +66,22 @@ Feature: CMS.Component Adding
            | Drag and Drop                 |
            | Image Mapped Input            |
            | Math Expression Input         |
-           | Problem Written in LaTeX      |
            | Problem with Adaptive Hint    |
 
+
+    Scenario: I can add Advanced Latex Problem components
+       Given I am in Studio editing a new unit
+       Given I have enabled latex compiler
+       When I add a "<Component>" "Advanced Problem" component
+       Then I see a "<Component>" Problem component
+       # Flush out the database before the next example executes
+       And I reset the database
+
+    Examples:
+           | Component                     |
+           | Problem Written in LaTeX      |
+           | Problem with Adaptive Hint in Latex  |
+
     Scenario: I see a prompt on delete
         Given I am in Studio editing a new unit
         And I add a "Discussion" "single step" component

cms/djangoapps/contentstore/features/html-editor.py

@@ -22,6 +22,7 @@ def i_see_only_the_html_display_name(step):
 @step('I have created an E-text Written in LaTeX$')
 def i_created_etext_in_latex(step):
     world.create_course_with_unit()
+    step.given('I have enabled latex compiler')
     world.create_component_instance(
         step=step,
         category='html',

cms/djangoapps/contentstore/features/problem-editor.py

@@ -5,6 +5,7 @@
 from lettuce import world, step
 from nose.tools import assert_equal, assert_true  # pylint: disable=E0611
 from common import type_in_codemirror, open_new_course
+from advanced_settings import change_value
 from course_import import import_file, go_to_import
 from selenium.webdriver.common.keys import Keys
 
@@ -159,9 +160,19 @@ def cancel_does_not_save_changes(step):
     step.given("I see the advanced settings and their expected values")
 
 
+@step('I have enabled latex compiler')
+def enable_latex_compiler(step):
+    url = world.browser.url
+    step.given("I select the Advanced Settings")
+    change_value(step, 'use_latex_compiler', True)
+    world.visit(url)
+    world.wait_for_xmodule()
+
+
 @step('I have created a LaTeX Problem')
 def create_latex_problem(step):
     world.create_course_with_unit()
+    step.given('I have enabled latex compiler')
     world.create_component_instance(
         step=step,
         category='problem',

cms/djangoapps/contentstore/views/component.py

@@ -193,12 +193,14 @@ def edit_unit(request, location):
         # add boilerplates
         if hasattr(component_class, 'templates'):
             for template in component_class.templates():
-                component_templates[category].append((
-                    template['metadata'].get('display_name'),
-                    category,
-                    template['metadata'].get('markdown') is not None,
-                    template.get('template_id')
-                ))
+                filter_templates = getattr(component_class, 'filter_templates', None)
+                if not filter_templates or filter_templates(template, course):
+                    component_templates[category].append((
+                        template['metadata'].get('display_name'),
+                        category,
+                        template['metadata'].get('markdown') is not None,
+                        template.get('template_id')
+                    ))
 
     # Check if there are any advanced modules specified in the course policy.
     # These modules should be specified as a list of strings, where the strings

cms/templates/widgets/metadata-edit.html

@@ -29,7 +29,7 @@
     <%static:include path="js/metadata-list-entry.underscore" />
 </script>
 
-<% showHighLevelSource='source_code' in editable_metadata_fields and editable_metadata_fields['source_code']['explicitly_set'] %>
+<% showHighLevelSource='source_code' in editable_metadata_fields and editable_metadata_fields['source_code']['explicitly_set'] and enable_latex_compiler %>
 <% metadata_field_copy = copy.copy(editable_metadata_fields) %>
 ## Delete 'source_code' field (if it exists) so metadata editor view does not attempt to render it.
 % if 'source_code' in editable_metadata_fields:

common/lib/xmodule/xmodule/capa_module.py

@@ -158,6 +158,11 @@ class CapaFields(object):
         # TODO: someday it should be possible to not duplicate this definition here
         # and in inheritance.py
     )
+    use_latex_compiler = Boolean(
+        help="Enable LaTeX templates?",
+        default=False,
+        scope=Scope.settings
+    )
 
 
 class CapaModule(CapaFields, XModule):
@@ -1174,10 +1179,23 @@ class CapaDescriptor(CapaFields, RawDescriptor):
     metadata_translations = dict(RawDescriptor.metadata_translations)
     metadata_translations['attempts'] = 'max_attempts'
 
+    @classmethod
+    def filter_templates(cls, template, course):
+        """
+        Filter template that contains 'latex' from templates.
+
+        Show them only if use_latex_compiler is set to True in
+        course settings.
+        """
+        return (not 'latex' in template['template_id'] or course.use_latex_compiler)
+
     def get_context(self):
         _context = RawDescriptor.get_context(self)
-        _context.update({'markdown': self.markdown,
-                         'enable_markdown': self.markdown is not None})
+        _context.update({
+            'markdown': self.markdown,
+            'enable_markdown': self.markdown is not None,
+            'enable_latex_compiler': self.use_latex_compiler,
+        })
         return _context
 
     # VS[compat]
@@ -1193,9 +1211,14 @@ def backcompat_paths(cls, path):
     @property
     def non_editable_metadata_fields(self):
         non_editable_fields = super(CapaDescriptor, self).non_editable_metadata_fields
-        non_editable_fields.extend([CapaDescriptor.due, CapaDescriptor.graceperiod,
-                                    CapaDescriptor.force_save_button, CapaDescriptor.markdown,
-                                    CapaDescriptor.text_customization])
+        non_editable_fields.extend([
+            CapaDescriptor.due,
+            CapaDescriptor.graceperiod,
+            CapaDescriptor.force_save_button,
+            CapaDescriptor.markdown,
+            CapaDescriptor.text_customization,
+            CapaDescriptor.use_latex_compiler,
+        ])
         return non_editable_fields
 
     # Proxy to CapaModule for access to any of its attributes

common/lib/xmodule/xmodule/html_module.py

@@ -7,7 +7,7 @@
 from path import path
 
 from pkg_resources import resource_string
-from xblock.fields import Scope, String
+from xblock.fields import Scope, String, Boolean
 from xmodule.editing_module import EditingDescriptor
 from xmodule.html_checker import check_html
 from xmodule.stringify import stringify_children
@@ -30,6 +30,11 @@ class HtmlFields(object):
     )
     data = String(help="Html contents to display for this module", default=u"", scope=Scope.content)
     source_code = String(help="Source code for LaTeX documents. This feature is not well-supported.", scope=Scope.settings)
+    use_latex_compiler = Boolean(
+        help="Enable LaTeX templates?",
+        default=False,
+        scope=Scope.settings
+    )
 
 
 class HtmlModule(HtmlFields, XModule):
@@ -82,6 +87,16 @@ def backcompat_paths(cls, path):
                 nc.append(candidate[:-4] + '.html')
         return candidates + nc
 
+    @classmethod
+    def filter_templates(cls, template, course):
+        """
+        Filter template that contains 'latex' from templates.
+
+        Show them only if use_latex_compiler is set to True in
+        course settings.
+        """
+        return (not 'latex' in template['template_id'] or course.use_latex_compiler)
+
     def get_context(self):
         """
         an override to add in specific rendering context, in this case we need to
@@ -90,7 +105,10 @@ def get_context(self):
         _context = EditingDescriptor.get_context(self)
         # Add some specific HTML rendering context when editing HTML modules where we pass
         # the root /c4x/ url for assets. This allows client-side substitutions to occur.
-        _context.update({'base_asset_url': StaticContent.get_base_url_path_for_course_assets(self.location) + '/'})
+        _context.update({
+            'base_asset_url': StaticContent.get_base_url_path_for_course_assets(self.location) + '/',
+            'enable_latex_compiler': self.use_latex_compiler,
+        })
         return _context
 
     # NOTE: html descriptors are special.  We do not want to parse and
@@ -191,6 +209,12 @@ def definition_to_xml(self, resource_fs):
         elt.set("filename", relname)
         return elt
 
+    @property
+    def non_editable_metadata_fields(self):
+        non_editable_fields = super(HtmlDescriptor, self).non_editable_metadata_fields
+        non_editable_fields.append(HtmlDescriptor.use_latex_compiler)
+        return non_editable_fields
+
 
 class AboutFields(object):
     display_name = String(

common/lib/xmodule/xmodule/modulestore/inheritance.py

@@ -47,6 +47,10 @@ class InheritanceMixin(XBlockMixin):
         help="String customization substitutions for particular locations",
         scope=Scope.settings
     )
+    use_latex_compiler = Boolean(
+        help="Enable LaTeX templates?",
+        default=False,
+        scope=Scope.settings)
 
 
 def compute_inherited_metadata(descriptor):

common/lib/xmodule/xmodule/templates/problem/problem_with_hint.yaml

@@ -1,51 +1,6 @@
 ---
 metadata:
     display_name: Problem with Adaptive Hint
-    source_code: |
-        \subsection{Problem With Adaptive Hint}
-
-        % Adaptive hints are messages provided to students which depend on
-        % student input.  These hints are produced using a script embedded
-        % within the problem (written in Python).  
-        %
-        % Here is an example.  This example uses LaTeX as a high-level
-        % soure language for the problem.  The problem can also be coded
-        % directly in XML.
-
-        This problem demonstrates a question with hints, based on using the
-        {\tt hintfn} method.
-
-        \begin{edXscript}
-        def test_str(expect, ans):
-          print expect, ans
-          ans = ans.strip("'")
-          ans = ans.strip('"')
-          return expect == ans.lower()
-
-        def hint_fn(answer_ids, student_answers, new_cmap, old_cmap):
-          aid = answer_ids[0]
-          ans = str(student_answers[aid]).lower()
-          print 'hint_fn called, ans=', ans
-          hint = ''
-          if 'java' in ans:
-             hint = 'that is only good for drinking'
-          elif 'perl' in ans:
-             hint = 'not that rich'
-          elif 'pascal' in ans:
-             hint = 'that is a beatnick language'
-          elif 'fortran' in ans:
-             hint = 'those were the good days'
-          elif 'clu' in ans:
-             hint = 'you must be invariant'
-          if hint:
-            hint = "<font color='blue'>Hint: {0}</font>".format(hint)
-            new_cmap.set_hint_and_mode(aid,hint,'always')
-        \end{edXscript}
-
-        What is the best programming language that exists today?   You may
-        enter your answer in upper or lower case, with or without quotes.
-
-        \edXabox{type="custom" cfn='test_str' expect='python' hintfn='hint_fn'}
     markdown: !!null
 data: |
     <problem>
@@ -61,7 +16,7 @@ data: |
       ans = ans.strip("'")
       ans = ans.strip('"')
       return expect == ans.lower()
-    
+
     def hint_fn(answer_ids, student_answers, new_cmap, old_cmap):
       aid = answer_ids[0]
       ans = str(student_answers[aid]).lower()