Customize overlay hint to disable overlay in ReActionView initializer (#88)

Related #47 
Related #81 
Related marcoroth/herb#1420

Author: marcoroth

README.md

@@ -46,7 +46,7 @@ ReActionView.configure do |config|
   # Enable debug mode
   config.debug_mode = Rails.env.development?
 
-  # Validation mode (:raise or :overlay) — defaults to :raise in test, :overlay otherwise
+  # Validation mode (:raise, :overlay, or :none) — defaults to :raise in test, :overlay otherwise
   # config.validation_mode = :overlay
 end
 ```

lib/generators/reactionview/install_generator.rb

@@ -23,7 +23,7 @@ def create_initializer
             # Enable debug mode in development (adds debug attributes to HTML)
             config.debug_mode = Rails.env.development?
 
-            # Validation mode (:raise or :overlay) — defaults to :raise in test, :overlay otherwise
+            # Validation mode (:raise, :overlay, or :none) — defaults to :raise in test, :overlay otherwise
             # config.validation_mode = :overlay
 
             # Add custom transform visitors to process templates before compilation

lib/reactionview/template/handlers/herb.rb

@@ -59,16 +59,28 @@ def editor_meta_tag
         end
 
         def reactionview_dev_tools_markup(template)
-          return nil unless layout_template?(template) && ::ReActionView.config.debug_mode_enabled?
+          return nil unless layout_template?(template)
           return nil unless local_template?(template)
 
-          <<~HTML
-            <meta name="herb-debug-mode" content="true">
-            <meta name="herb-project-path" content="#{Rails.root}">
-            #{editor_meta_tag}
+          markup = +""
 
-            #{ActionController::Base.new.view_context.javascript_include_tag "reactionview-dev-tools.umd.js", defer: true}
-          HTML
+          if ::ReActionView.config.debug_mode_enabled?
+            markup << <<~HTML
+              <meta name="herb-debug-mode" content="true">
+              <meta name="herb-project-path" content="#{Rails.root}">
+              #{editor_meta_tag}
+
+              #{ActionController::Base.new.view_context.javascript_include_tag "reactionview-dev-tools.umd.js", defer: true}
+            HTML
+          end
+
+          if ::ReActionView.config.validation_mode == :overlay
+            markup << <<~HTML
+              <template data-herb-dismiss-hint>You can also disable this overlay by setting <code style="color: #ffeb3b; font-family: monospace; font-size: 12pt;">config.validation_mode = :none</code> in <code style="color: #ffeb3b; font-family: monospace; font-size: 12pt;">config/initializers/reactionview.rb</code>.</template>
+            HTML
+          end
+
+          markup.presence
         end
       end
     end

test/reactionview/config_test.rb

@@ -35,6 +35,18 @@ def config.test?
     assert_equal :overlay, config.validation_mode
   end
 
+  test "explicit :none disables validation" do
+    config = ReActionView::Config.new
+
+    def config.test?
+      true
+    end
+
+    config.validation_mode = :none
+
+    assert_equal :none, config.validation_mode
+  end
+
   test "explicit :raise overrides non-test environment default" do
     config = ReActionView::Config.new