Implement program listing fragment for mobile app.

Converted the program listing logic into a web fragment view
and exposed a URL for mobile app.

LEARNER-2980

lms/djangoapps/learner_dashboard/programs.py

@@ -0,0 +1,54 @@
+"""
+Fragments for rendering programs.
+"""
+from django.http import Http404
+from django.template.loader import render_to_string
+from django.utils.translation import get_language_bidi
+from web_fragments.fragment import Fragment
+
+from openedx.core.djangoapps.plugin_api.views import EdxFragmentView
+from openedx.core.djangoapps.programs.models import ProgramsApiConfig
+from openedx.core.djangoapps.programs.utils import (
+    ProgramProgressMeter,
+    get_program_marketing_url
+)
+
+
+class ProgramsFragmentView(EdxFragmentView):
+    """
+    A fragment to program listing.
+    """
+    def render_to_fragment(self, request, **kwargs):
+        """
+        Render the program listing fragment.
+        """
+        user = request.user
+        programs_config = kwargs.get('programs_config') or ProgramsApiConfig.current()
+        if not programs_config.enabled or not user.is_authenticated():
+            raise Http404
+
+        meter = ProgramProgressMeter(request.site, user)
+
+        context = {
+            'marketing_url': get_program_marketing_url(programs_config),
+            'programs': meter.engaged_programs,
+            'progress': meter.progress()
+        }
+        html = render_to_string('learner_dashboard/programs_fragment.html', context)
+        programs_fragment = Fragment(html)
+        self.add_fragment_resource_urls(programs_fragment)
+
+        return programs_fragment
+
+    def css_dependencies(self):
+        """
+        Returns list of CSS files that this view depends on.
+
+        The helper function that it uses to obtain the list of CSS files
+        works in conjunction with the Django pipeline to ensure that in development mode
+        the files are loaded individually, but in production just the single bundle is loaded.
+        """
+        if get_language_bidi():
+            return self.get_css_dependencies('style-learner-dashboard-rtl')
+        else:
+            return self.get_css_dependencies('style-learner-dashboard')