Add bun support

lib/generators/htmx/install_generator.rb

@@ -11,7 +11,9 @@ class InstallGenerator < ::Rails::Generators::Base
 
       # Setup HTMX
       def setup
-        if importmap?
+        if bun_configured?
+          setup_bun
+        elsif importmap?
           setup_importmap
         elsif webpacker?
           setup_webpacker
@@ -24,6 +26,10 @@ def setup
 
       private
 
+      def bun_configured?
+        Pathname.new(destination_root).join('bun.config.js').exist?
+      end
+
       def webpacker?
         !!defined?(Webpacker)
       end
@@ -40,38 +46,34 @@ def manifest(javascript_dir)
         Pathname.new(destination_root).join(javascript_dir, 'application.js')
       end
 
-      def setup_importmap
-        run 'bin/importmap pin htmx.org'
-
-        manifest = manifest('app/javascript')
-
+      def add_to_manifest(manifest, text)
         if manifest.exist?
-          append_file manifest, "\n#{IMPORTMAP_SETUP}"
+          append_file manifest, "\n#{text}"
         else
-          create_file manifest, IMPORTMAP_SETUP
+          create_file manifest, text
         end
       end
 
-      def setup_sprockets
-        manifest = manifest('app/assets/javascripts')
+      def setup_bun
+        run 'bun add htmx.org'
 
-        if manifest.exist?
-          append_file manifest, "\n#{SPROCKETS_SETUP}"
-        else
-          create_file manifest, SPROCKETS_SETUP
-        end
+        add_to_manifest(manifest('app/javascript'), IMPORTMAP_SETUP)
+      end
+
+      def setup_importmap
+        run 'bin/importmap pin htmx.org'
+
+        add_to_manifest(manifest('app/javascript'), IMPORTMAP_SETUP)
+      end
+
+      def setup_sprockets
+        add_to_manifest(manifest('app/assets/javascripts'), SPROCKETS_SETUP)
       end
 
       def setup_webpacker
         run 'yarn add htmx.org'
 
-        manifest = manifest(webpack_source_path)
-
-        if manifest.exist?
-          append_file(manifest, "\n#{WEBPACKER_SETUP}")
-        else
-          create_file(manifest, WEBPACKER_SETUP)
-        end
+        add_to_manifest(manifest(webpack_source_path), WEBPACKER_SETUP)
       end
 
       def webpack_source_path

spec/generators/install_generator_spec.rb

@@ -114,6 +114,36 @@
     end
   end
 
+  context 'with bun configured' do
+    before do
+      generate_bun_config
+    end
+
+    context 'when `application.js` exists' do
+      before do
+        generate_application_js('/app/javascript')
+      end
+
+      it 'updates file with htmx import' do
+        run_generator
+        assert_file(
+          'app/javascript/application.js',
+          "\n#{Htmx::Generators::InstallGenerator::IMPORTMAP_SETUP}"
+        )
+      end
+    end
+
+    context 'when `application.js` does not exists' do
+      it 'creates `application.js` file with htmx require' do
+        run_generator
+        assert_file(
+          'app/javascript/application.js',
+          Htmx::Generators::InstallGenerator::IMPORTMAP_SETUP
+        )
+      end
+    end
+  end
+
   context 'with no asset pipeline' do
     before do
       hide_const('Webpacker')

spec/support/files_helper.rb

@@ -7,5 +7,10 @@ def generate_application_js(location_folder)
       FileUtils.mkdir_p(pathname)
       File.write("#{pathname}/application.js", '')
     end
+
+    def generate_bun_config
+      FileUtils.mkdir_p(destination_root)
+      File.write("#{destination_root}/bun.config.js", "// Some JS\n")
+    end
   end
 end