julik · April 22, 2025 09:29 · Apr 22, 2025 · Apr 22, 2025
diff --git a/gistfile1.txt → styled_templates.rb b/gistfile1.txt → styled_templates.rb
diff --git a/gistfile1.txt b/gistfile1.txt
@@ -0,0 +1,46 @@
+# <%= style_for_this_template do %>
+#   width: 128px;
+#   .caption {
+#     font-size: 12px;
+#     text-align: center;
+#   }
+# <% end %>
+# <div class="<%= css_class_for_this_template %>">
+#   <div class="title">Hello!</div>
+# </div>
+module StyledTemplatesHelper
+  def css_class_selector_for_this_template
+    ".#{css_class_for_this_template}"
+  end
+
+  def css_class_for_this_template
+    raise "@current_template is not set, so we can't intuit the wrapping class name for this block" unless @current_template.present?
+
+    # Rails computes the method name the template will be compiled into. This method name changes with changes to the template
+    # source, and includes the digest-like details and all the other useful bits.
+    compiled_template_method_name = @current_template.method_name
+    # We will use the virtual path as the base for our CSS class
+    template_virtual_path = @current_template.virtual_path
+    _css_class_name = template_virtual_path.gsub(/(\/|_)/, "-") + "-" + Digest::SHA1.hexdigest(compiled_template_method_name)[0..3]
+  end
+
+  def style_for_this_template(css_source_or_nil = nil)
+    if !block_given? && style_source.blank?
+      raise "You need to either pass the CSS code as the first argument or render it from the passed block"
+    end
+    css_class_name = css_class_for_this_template
+    @styles_already_output ||= Set.new
+    return if @styles_already_output.include?(css_class_name)
+
+    # https://thepugautomatic.com/2013/06/helpers/
+    capture do
+      concat("<style>\n".html_safe)
+      concat("\n.#{css_class_name} {\n")
+      concat((block_given? ? yield : css_source_or_nil) + "\n")
+      concat("\n}\n")
+      concat("</style>\n".html_safe)
+    end.tap do
+      @styles_already_output << css_class_name
+    end
+  end
+end
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