Use bun for installation if applicable (#494)

* Use bun for installation if applicable

* Namespace rake helpers so they don't conflict

* Implement review suggestions

lib/install/turbo_with_bun.rb

@@ -0,0 +1,9 @@
+if (js_entrypoint_path = Rails.root.join("app/javascript/application.js")).exist?
+  say "Import Turbo"
+  append_to_file "app/javascript/application.js", %(import "@hotwired/turbo-rails"\n)
+else
+  say "You must import @hotwired/turbo-rails in your JavaScript entrypoint file", :red
+end
+
+say "Install Turbo"
+run "bun add @hotwired/turbo-rails"

lib/tasks/turbo_tasks.rake

@@ -1,18 +1,27 @@
-def run_turbo_install_template(path)
-  system "#{RbConfig.ruby} ./bin/rails app:template LOCATION=#{File.expand_path("../install/#{path}.rb", __dir__)}"
-end
+module Turbo
+  module Tasks
+    extend self
+    def run_turbo_install_template(path)
+      system "#{RbConfig.ruby} ./bin/rails app:template LOCATION=#{File.expand_path("../install/#{path}.rb", __dir__)}"
+    end
 
-def redis_installed?
-  Gem.win_platform? ?
-    system('where redis-server > NUL 2>&1') : 
-    system('which redis-server > /dev/null')
-end
+    def redis_installed?
+      Gem.win_platform? ?
+        system('where redis-server > NUL 2>&1') :
+        system('which redis-server > /dev/null')
+    end
 
-def switch_on_redis_if_available
-  if redis_installed?
-    Rake::Task["turbo:install:redis"].invoke
-  else
-    puts "Run turbo:install:redis to switch on Redis and use it in development for turbo streams"
+    def switch_on_redis_if_available
+      if redis_installed?
+        Rake::Task["turbo:install:redis"].invoke
+      else
+        puts "Run turbo:install:redis to switch on Redis and use it in development for turbo streams"
+      end
+    end
+
+    def using_bun?
+      Rails.root.join("bun.config.js").exist?
+    end
   end
 end
 
@@ -21,6 +30,8 @@ namespace :turbo do
   task :install do
     if Rails.root.join("config/importmap.rb").exist?
       Rake::Task["turbo:install:importmap"].invoke
+    elsif Rails.root.join("package.json").exist? && Turbo::Tasks.using_bun?
+      Rake::Task["turbo:install:bun"].invoke
     elsif Rails.root.join("package.json").exist?
       Rake::Task["turbo:install:node"].invoke
     else
@@ -31,19 +42,25 @@ namespace :turbo do
   namespace :install do
     desc "Install Turbo into the app with asset pipeline"
     task :importmap do
-      run_turbo_install_template "turbo_with_importmap"
-      switch_on_redis_if_available
+      Turbo::Tasks.run_turbo_install_template "turbo_with_importmap"
+      Turbo::Tasks.switch_on_redis_if_available
     end
 
     desc "Install Turbo into the app with webpacker"
     task :node do
-      run_turbo_install_template "turbo_with_node"
-      switch_on_redis_if_available
+      Turbo::Tasks.run_turbo_install_template "turbo_with_node"
+      Turbo::Tasks.switch_on_redis_if_available
+    end
+
+    desc "Install Turbo into the app with bun"
+    task :bun do
+      Turbo::Tasks.run_turbo_install_template "turbo_with_bun"
+      Turbo::Tasks.switch_on_redis_if_available
     end
 
     desc "Switch on Redis and use it in development"
     task :redis do
-      run_turbo_install_template "turbo_needs_redis"
+      Turbo::Tasks.run_turbo_install_template "turbo_needs_redis"
     end
   end
 end