generator: auto-install Shakapacker if not installed

Author: ihabadham

lib/generators/react_on_rails/install_generator.rb

@@ -27,6 +27,7 @@ class InstallGenerator < Rails::Generators::Base
 
       def run_generators
         if installation_prerequisites_met? || options.ignore_warnings?
+          ensure_shakapacker_installed
           invoke_generators
           add_bin_scripts
           add_post_install_message
@@ -97,6 +98,27 @@ def add_post_install_message
         GeneratorMessages.add_info(GeneratorMessages.helpful_message_after_installation)
       end
 
+      def ensure_shakapacker_installed
+        return if shakapacker_installed?
+
+        GeneratorMessages.add_info("Shakapacker not detected. Installing Shakapacker...")
+        
+        result = system("rails shakapacker:install")
+        unless result
+          GeneratorMessages.add_error("Failed to install Shakapacker automatically. Please run 'rails shakapacker:install' manually.")
+          return
+        end
+
+        GeneratorMessages.add_info("Shakapacker installed successfully!")
+      end
+
+      def shakapacker_installed?
+        Gem::Specification.find_by_name("shakapacker")
+        true
+      rescue Gem::MissingSpecError
+        false
+      end
+
       def using_shakapacker_7_or_above?
         shakapacker_gem = Gem::Specification.find_by_name("shakapacker")
         shakapacker_gem.version.segments.first >= 7

spec/react_on_rails/generators/install_generator_spec.rb

@@ -130,4 +130,45 @@
       expect(install_generator.send(:missing_npm?)).to be true
     end
   end
+
+  context "when detecting Shakapacker installation" do
+    let(:install_generator) { described_class.new }
+
+    context "shakapacker_installed?" do
+      specify "when Shakapacker gem is installed" do
+        mock_gem = double("gem_spec", version: double("version", segments: [7, 0, 0]))
+        allow(Gem::Specification).to receive(:find_by_name).with("shakapacker").and_return(mock_gem)
+        expect(install_generator.send(:shakapacker_installed?)).to be true
+      end
+
+      specify "when Shakapacker gem is not installed" do
+        allow(Gem::Specification).to receive(:find_by_name).with("shakapacker").and_raise(Gem::MissingSpecError.new("gem", "spec"))
+        expect(install_generator.send(:shakapacker_installed?)).to be false
+      end
+    end
+
+    context "ensure_shakapacker_installed" do
+      specify "when Shakapacker is already installed" do
+        allow(install_generator).to receive(:shakapacker_installed?).and_return(true)
+        expect(install_generator).not_to receive(:system)
+        install_generator.send(:ensure_shakapacker_installed)
+      end
+
+      specify "when Shakapacker is not installed and install succeeds" do
+        allow(install_generator).to receive(:shakapacker_installed?).and_return(false)
+        allow(install_generator).to receive(:system).with("rails shakapacker:install").and_return(true)
+        expect(GeneratorMessages).to receive(:add_info).with("Shakapacker not detected. Installing Shakapacker...")
+        expect(GeneratorMessages).to receive(:add_info).with("Shakapacker installed successfully!")
+        install_generator.send(:ensure_shakapacker_installed)
+      end
+
+      specify "when Shakapacker is not installed and install fails" do
+        allow(install_generator).to receive(:shakapacker_installed?).and_return(false)
+        allow(install_generator).to receive(:system).with("rails shakapacker:install").and_return(false)
+        expect(GeneratorMessages).to receive(:add_info).with("Shakapacker not detected. Installing Shakapacker...")
+        expect(GeneratorMessages).to receive(:add_error).with("Failed to install Shakapacker automatically. Please run 'rails shakapacker:install' manually.")
+        install_generator.send(:ensure_shakapacker_installed)
+      end
+    end
+  end
 end