[Feature] Allow ruby_ui:component to accept multiple components (#416)

* [Feature] Allow ruby_ui:component to accept multiple components

The component generator now accepts multiple component names in a single
invocation (e.g. `bin/rails g ruby_ui:component Button Link Input Textarea`),
matching the command already produced by the MCP add-command tool.

- Switch the generator argument to an array and validate all names upfront,
  reporting every missing component at once.
- Run the Stimulus manifest update a single time at the end instead of once
  per component.
- Generate all components via a single invocation in the `:all` generator.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* [Bug Fix] Exit with non-zero status when components are missing

`validate_components!` used a bare `exit`, which in Ruby is `exit(true)` and
yields exit status 0. A failed generation therefore reported success to the
shell, so CI steps and scripts gating on the exit code treated missing-component
errors as passing runs. Use `exit 1` so the failure is observable.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* [Bug Fix] Select only directories in ruby_ui:component:all

The batch generator filtered out only `.rb` files, so any other non-directory
entry at the source root (e.g. a macOS `.DS_Store`) survived and was passed as
a component name. Since the names are now generated in a single invocation,
`validate_components!` would reject the whole batch and abort the entire
all-components run. Components are always directories, so select directories
only — this excludes `.rb` files, dotfiles, and any stray file at once.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: jacksonpires

gem/README.md

@@ -55,6 +55,12 @@ You can generate your components using `ruby_ui:component` generator.
 bin/rails g ruby_ui:component Accordion
 ```
 
+You can also generate multiple components at once.
+
+```bash
+bin/rails g ruby_ui:component Button Link Input Textarea
+```
+
 You also can generate all components using `ruby_ui:component:all` generator
 
 ## Documentation 📖

gem/lib/generators/ruby_ui/component/all_generator.rb

@@ -10,11 +10,13 @@ class AllGenerator < Rails::Generators::Base
         def generate_components
           say "Generating all components..."
 
-          Dir.children(self.class.source_root).each do |folder_name|
-            next if folder_name.ends_with?(".rb")
-
-            run "bin/rails generate ruby_ui:component #{folder_name} --force #{options["force"]}"
+          # Each component lives in its own directory; select directories only so stray
+          # files (e.g. base.rb or a macOS .DS_Store) are never passed as component names.
+          folder_names = Dir.children(self.class.source_root).select do |entry|
+            File.directory?(File.join(self.class.source_root, entry))
           end
+
+          run "bin/rails generate ruby_ui:component #{folder_names.join(" ")} --force #{options["force"]}"
         end
       end
     end

gem/lib/generators/ruby_ui/component_generator.rb

@@ -7,69 +7,89 @@ class ComponentGenerator < Rails::Generators::Base
       namespace "ruby_ui:component"
 
       source_root File.expand_path("../../ruby_ui", __dir__)
-      argument :component_name, type: :string, required: true
+      argument :component_names, type: :array, required: true, banner: "Button Link Input"
       class_option :force, type: :boolean, default: false
       class_option :with_docs, type: :boolean, default: false
 
-      def generate_component
-        if component_not_found?
-          say "Component not found: #{component_name}", :red
-          exit
+      def generate_components
+        validate_components!
+
+        component_names.each do |component_name|
+          say "Generating #{component_name} files..."
+          copy_related_component_files(component_name)
+          copy_js_files(component_name)
+          install_dependencies(component_name)
         end
 
-        say "Generating #{component_name} files..."
+        update_stimulus_manifest
       end
 
-      def copy_related_component_files
+      private
+
+      def validate_components!
+        missing = component_names.reject { |name| component_exists?(name) }
+        return if missing.empty?
+
+        say "Component(s) not found: #{missing.join(", ")}", :red
+        exit 1
+      end
+
+      def copy_related_component_files(component_name)
         say "Generating components"
 
-        components_file_paths.each do |file_path|
+        components_file_paths(component_name).each do |file_path|
           component_file_name = file_path.split("/").last
-          copy_file file_path, Rails.root.join("app/components/ruby_ui", component_folder_name, component_file_name), force: options["force"]
+          copy_file file_path, Rails.root.join("app/components/ruby_ui", component_folder_name(component_name), component_file_name), force: options["force"]
         end
       end
 
-      def copy_js_files
-        return if js_controller_file_paths.empty?
+      def copy_js_files(component_name)
+        paths = js_controller_file_paths(component_name)
+        return if paths.empty?
 
         say "Generating Stimulus controllers"
 
-        js_controller_file_paths.each do |file_path|
+        paths.each do |file_path|
           controller_file_name = file_path.split("/").last
           copy_file file_path, Rails.root.join("app/javascript/controllers/ruby_ui", controller_file_name), force: options["force"]
         end
 
+        @stimulus_controllers_added = true
+      end
+
+      def update_stimulus_manifest
+        return unless @stimulus_controllers_added
+
         # Importmap doesn't have controller manifest, instead it uses `eagerLoadControllersFrom("controllers", application)`
-        if !using_importmap?
-          say "Updating Stimulus controllers manifest"
-          run "rake stimulus:manifest:update"
-        end
+        return if using_importmap?
+
+        say "Updating Stimulus controllers manifest"
+        run "rake stimulus:manifest:update"
       end
 
-      def install_dependencies
-        return if dependencies.blank?
+      def install_dependencies(component_name)
+        deps = dependencies(component_name)
+        return if deps.blank?
 
         say "Installing dependencies"
 
-        install_components_dependencies(dependencies["components"])
-        install_gems_dependencies(dependencies["gems"])
-        install_js_packages(dependencies["js_packages"])
+        install_components_dependencies(deps["components"])
+        install_gems_dependencies(deps["gems"])
+        install_js_packages(deps["js_packages"])
       end
 
-      private
-
-      def component_not_found? = !Dir.exist?(component_folder_path)
+      def component_exists?(component_name) = Dir.exist?(component_folder_path(component_name))
 
-      def component_folder_name = component_name.underscore
+      def component_folder_name(component_name) = component_name.underscore
 
-      def component_folder_path = File.join(self.class.source_root, component_folder_name)
+      def component_folder_path(component_name) = File.join(self.class.source_root, component_folder_name(component_name))
 
-      def components_file_paths
-        files = Dir.glob(File.join(component_folder_path, "*.rb"))
+      def components_file_paths(component_name)
+        files = Dir.glob(File.join(component_folder_path(component_name), "*.rb"))
         options["with_docs"] ? files : files.reject { |f| f.end_with?("_docs.rb") }
       end
 
-      def js_controller_file_paths = Dir.glob(File.join(component_folder_path, "*.js"))
+      def js_controller_file_paths(component_name) = Dir.glob(File.join(component_folder_path(component_name), "*.js"))
 
       def install_components_dependencies(components)
         components&.each do |component|
@@ -89,10 +109,10 @@ def install_js_packages(js_packages)
         end
       end
 
-      def dependencies
+      def dependencies(component_name)
         @dependencies ||= YAML.load_file(File.join(__dir__, "dependencies.yml")).freeze
 
-        @dependencies[component_folder_name]
+        @dependencies[component_folder_name(component_name)]
       end
     end
   end

gem/test/generators/component_generator_test.rb

@@ -82,4 +82,25 @@ def test_tooltip_installs_typography_for_text_component
 
     assert_includes dependencies.fetch("tooltip").fetch("components"), "Typography"
   end
+
+  def test_resolves_component_folders_for_multiple_components
+    source_root = File.expand_path("../../lib/ruby_ui", __dir__)
+
+    # Folder names mirror ComponentGenerator's `component_name.underscore`.
+    {"Button" => "button", "Link" => "link", "Input" => "input", "Textarea" => "textarea"}.each do |component_name, folder_name|
+      folder_path = File.join(source_root, folder_name)
+
+      assert(Dir.exist?(folder_path),
+        "Expected folder for #{component_name} to exist at #{folder_path}")
+    end
+  end
+
+  def test_validation_collects_all_missing_components
+    source_root = File.expand_path("../../lib/ruby_ui", __dir__)
+    folder_names = {"Button" => "button", "NotARealComponent" => "not_a_real_component", "AnotherFakeOne" => "another_fake_one"}
+
+    missing = folder_names.reject { |_name, folder| Dir.exist?(File.join(source_root, folder)) }.keys
+
+    assert_equal %w[NotARealComponent AnotherFakeOne], missing
+  end
 end