treat properly callouts

assets/stylesheets/application.css.scss

@@ -109,6 +109,7 @@
         'pages/qt',
         'pages/ramda',
         'pages/rdoc',
+        'pages/react',
         'pages/react_native',
         'pages/reactivex',
         'pages/redis',

assets/stylesheets/pages/_react.scss

@@ -0,0 +1,20 @@
+._react {
+  @extend %simple;
+
+  .note {
+    @extend %note;
+  }
+
+  .note-orange {
+    @extend %note-orange;
+  }
+
+  .note-blue {
+    @extend %note-blue;
+  }
+
+  .note-green {
+    @extend %note-green;
+  }
+
+}

docs/adding-docs.md

@@ -13,7 +13,7 @@ Adding a documentation may look like a daunting task but once you get the hang o
 6. Generate the full documentation using the `thor docs:generate [my_doc] --force` command. Additionally, you can use the `--verbose` option to see which files are being created/updated/deleted (useful to see what changed since the last run), and the `--debug` option to see which URLs are being requested and added to the queue (useful to pin down which page adds unwanted URLs to the queue).
 7. Start the server, open the app, enable the documentation, and see how everything plays out.
 8. Tweak the scraper/filters and repeat 5) and 6) until the pages and metadata are ok.
-9. To customize the pages' styling, create an SCSS file in the `assets/stylesheets/pages/` directory and import it in both `application.css.scss` AND `application-dark.css.scss`. Both the file and CSS class should be named `_[type]` where [type] is equal to the scraper's `type` attribute (documentations with the same type share the same custom CSS and JS). Setting the type to `simple` will apply the general styling rules in `assets/stylesheets/pages/_simple.scss`, which can be used for documentations where little to no CSS changes are needed.
+9. To customize the pages' styling, create an SCSS file in the `assets/stylesheets/pages/` directory and import it in `application.css.scss`. Both the file and CSS class should be named `_[type]` where [type] is equal to the scraper's `type` attribute (documentations with the same type share the same custom CSS and JS). Setting the type to `simple` will apply the general styling rules in `assets/stylesheets/pages/_simple.scss`, which can be used for documentations where little to no CSS changes are needed.
 10. To add syntax highlighting or execute custom JavaScript on the pages, create a file in the `assets/javascripts/views/pages/` directory (take a look at the other files to see how it works).
 11. Add the documentation's icon in the `public/icons/docs/[my_doc]/` directory, in both 16x16 and 32x32-pixels formats. The icon spritesheet is automatically generated when you (re)start your local DevDocs instance.
 12. Add the documentation's copyright details to `options[:attribution]`. This is the data shown in the table on the [about](https://devdocs.io/about) page, and is ordered alphabetically. Please see an existing scraper for the typesetting.

lib/docs/filters/react/clean_html_react_dev.rb

@@ -30,9 +30,30 @@ module Docs
           node.parent.parent.parent.remove
         end
 
+        # Transform callout blocks
+        class_transform = {
+          '.expandable-callout[class*=yellow]' => 'note note-orange', # pitfalls, experimental
+          '.expandable-callout[class*=green]' => 'note note-green', # note
+          '.bg-card' => 'note', # you will learn
+          'details' => 'note note-blue' # deep dive
+        }
+
+        class_transform.each do |old_class, new_class|
+          css(old_class).each do |node|
+            node.set_attribute('class', new_class)
+          end
+        end
+
+        # Transform h3 to h4 inside callouts
+        css('.note h3').each do |node|
+          new_node = Nokogiri::XML::Node.new('h4', @doc)
+          new_node.content = node.content
+          node.replace(new_node)
+        end
+
         # Remove styling divs while lifting children
         styling_prefixes = %w[ps- mx- my- px- py- mb- sp- rounded-]
-        selectors = styling_prefixes.map { |prefix| "div[class*=\"#{prefix}\"]" }
+        selectors = styling_prefixes.map { |prefix| "div[class*=\"#{prefix}\"]:not(.note)" }
         css(*selectors, 'div[class=""]', 'div.cm-line').each do |node|
           node.before(node.children).remove
         end
@@ -45,8 +66,8 @@ module Docs
           node['data-language'] = 'jsx'
         end
 
-        # Remove styling
-        css('*').remove_attr('class').remove_attr('style')
+        # Remove styling except for callouts and images
+        css('*:not([class*=image]):not(.note)').remove_attr('class').remove_attr('style')
 
         doc
       end

lib/docs/filters/react/entries_react_dev.rb

@@ -16,7 +16,7 @@ module Docs
                          &.sub(/^./, &:upcase) # capitalize first letter
                          &.concat(": ")
         is_learn_page = path.start_with?('learn/') || slug == 'learn'
-        prefix = is_learn_page ? 'Learn: ' : top_category
+        prefix = is_learn_page ? 'Learn: ' : top_category || ''
         return update_canary_copy(prefix + (category || 'Miscellaneous'))
       end
 

lib/docs/scrapers/react.rb

@@ -2,7 +2,7 @@ module Docs
   class React < UrlScraper
 
     self.name = 'React'
-    self.type = 'simple'
+    self.type = 'react'
     self.links = {
       home: 'https://react.dev/',
       code: 'https://github.com/facebook/react'