Show SVG using R2DT-web (#529)

* Use R2DT-Web to show secondary structure
* Use local r2dt-web
* Check if r2dt-web is installed

rnacentral/portal/templates/portal/sequence.html

@@ -414,7 +414,15 @@ limitations under the License.
                 <uib-tab-heading>
                   2D structure <span class="label label-success">New</span>
                 </uib-tab-heading>
-                <secondary-structures upi="upi" taxid="taxid" show-secondary-structure-tab="true"></secondary-structures>
+                <r2dt-web
+                        search='{"urs": "{{ context.upi }}"}'
+                        customStyle='{"fixCss": "true", "titleColor": "#BF8E3E"}'
+                />
+                {% if context.plugin_installed %}
+                    <script type="text/javascript" src="{% static "r2dt-web/dist/r2dt-web.js" %}"></script>
+                {% else %}
+                    <script type="text/javascript" src="https://rnacentral.github.io/r2dt-web/dist/r2dt-web.js"></script>
+                {% endif %}
             </uib-tab>
             {% endif %}
 

rnacentral/portal/views.py

@@ -141,7 +141,14 @@ def rna_view(request, upi, taxid=None):
         except AttributeError:
             summary_so_terms = ''
 
+    # Check if r2dt-web is installed
+    path = os.path.join(
+        settings.PROJECT_PATH, 'rnacentral', 'portal', 'static', 'r2dt-web', 'dist', 'r2dt-web.js'
+    )
+    plugin_installed = True if os.path.isfile(path) else False
+
     context = {
+        'upi': upi,
         'symbol_counts': symbol_counts,
         'non_canonical_base_counts': non_canonical_base_counts,
         'taxid': taxid,
@@ -155,6 +162,7 @@ def rna_view(request, upi, taxid=None):
         'mirna_regulators': rna.get_mirna_regulators(taxid=taxid),
         'annotations_from_other_species': rna.get_annotations_from_other_species(taxid=taxid),
         'intact': rna.get_intact(taxid),
+        'plugin_installed': plugin_installed,
     }
     response = render(request, 'portal/sequence.html', {'rna': rna, 'context': context})
     # define canonical URL for Google