improve and simplify location detection

src/scripts/show_originals.js

@@ -10,6 +10,9 @@ const hiddenAttribute = 'data-show-originals-hidden';
 const lengthenedClass = 'xkit-show-originals-lengthened';
 const controlsClass = 'xkit-show-originals-controls';
 
+const blogTimelineRegex = /^\/v2\/blog\/[a-z0-9-]{1,32}\/posts$/;
+const channelSelector = `${keyToCss('bar')} ~ *`;
+
 const storageKey = 'show_originals.savedModes';
 const includeFiltered = true;
 
@@ -63,21 +66,15 @@ const addControls = async (timelineElement, location) => {
 const getLocation = timelineElement => {
   const { timeline, which } = timelineElement.dataset;
 
-  const isInBlogView = timelineElement.matches(blogViewSelector);
-  const isSinglePostBlogView = timeline.includes('permalink');
+  const isBlog = blogTimelineRegex.test(timeline) && !timelineElement.matches(channelSelector);
 
   const on = {
     dashboard: timeline === '/v2/timeline/dashboard',
-    peepr: isInBlogView && !isSinglePostBlogView,
+    disabled: isBlog && disabledBlogs.some(name => timeline === `/v2/blog/${name}/posts`),
+    peepr: isBlog,
     blogSubscriptions: timeline.includes('blog_subscriptions') || which === 'blog_subscriptions'
-
   };
-  const location = Object.keys(on).find(location => on[location]);
-  const isDisabledBlog = disabledBlogs.some(name => timeline.startsWith(`/v2/blog/${name}/`));
-
-  if (!location || isSinglePostBlogView) return undefined;
-  if (isDisabledBlog) return 'disabled';
-  return location;
+  return Object.keys(on).find(location => on[location]);
 };
 
 const processTimelines = async () => {