move hypothesis loader into a separate file

 * Allows it to properly be controlled by an envvar, and avoids making
   it automatically available to all renderers.

Author: felliott

mfr/extensions/pdf/templates/viewer.mako

@@ -423,6 +423,9 @@ http://sourceforge.net/adobe/cmap/wiki/License/
         var DEFAULT_URL = '${url}';
         window.pymChild.sendMessage('embed', 'embed-responsive-pdf');
     </script>
+    % if enable_hypothesis:
+    <script src="/static/js/mfr.child.hypothesis.js"></script>
+    % endif
   </body>
 </html>
 

mfr/server/static/js/mfr.child.hypothesis.js

@@ -0,0 +1,26 @@
+;(function() {
+    'use strict';
+
+    var hypothesisLoaded = false;
+
+    window.pymChild.onMessage('startHypothesis', startHypothesis);
+
+    window.addEventListener('message', function(event) {
+        if (event.data === 'startHypothesis') {
+            startHypothesis(event);
+        }
+    });
+
+    function startHypothesis(event) {
+        if (hypothesisLoaded) {
+            return;
+        }
+
+        var script = window.document.createElement('script');
+        script.type = 'text/javascript';
+        script.src = 'https://hypothes.is/embed.js';
+        window.document.head.appendChild(script);
+        window.document.body.classList.add('show-hypothesis');
+        hypothesisLoaded = true;
+    };
+})();

mfr/server/static/js/mfr.child.js

@@ -26,27 +26,4 @@
     window.pymChild.onMessage('resize', function () {
         window.pymChild.sendHeight();
     });
-
-    var hypothesisLoaded = false;
-
-    window.pymChild.onMessage('startHypothesis', startHypothesis);
-
-    window.addEventListener('message', function(event) {
-        if (event.data === 'startHypothesis') {
-            startHypothesis(event);
-        }
-    });
-
-    function startHypothesis(event) {
-        if (hypothesisLoaded) {
-            return;
-        }
-
-        var script = window.document.createElement('script');
-        script.type = 'text/javascript';
-        script.src = 'https://hypothes.is/embed.js';
-        window.document.head.appendChild(script);
-        window.document.body.classList.add('show-hypothesis');
-        hypothesisLoaded = true;
-    };
 })();