Implement Engines support

lib/tailwindcss/commands.rb

@@ -3,13 +3,16 @@
 module Tailwindcss
   module Commands
     class << self
-      def compile_command(debug: false, **kwargs)
+      def rails_root
+        defined?(Rails) ? Rails.root : Pathname.new(Dir.pwd)
+      end
+
+      def compile_command(input = rails_root.join("app/assets/tailwind/application.css").to_s, debug: false, **kwargs)
         debug = ENV["TAILWINDCSS_DEBUG"].present? if ENV.key?("TAILWINDCSS_DEBUG")
-        rails_root = defined?(Rails) ? Rails.root : Pathname.new(Dir.pwd)
 
         command = [
           Tailwindcss::Ruby.executable(**kwargs),
-          "-i", rails_root.join("app/assets/tailwind/application.css").to_s,
+          "-i", input,
           "-o", rails_root.join("app/assets/builds/tailwind.css").to_s,
         ]
 
@@ -21,8 +24,8 @@ def compile_command(debug: false, **kwargs)
         command
       end
 
-      def watch_command(always: false, poll: false, **kwargs)
-        compile_command(**kwargs).tap do |command|
+      def watch_command(input = rails_root.join("app/assets/tailwind/application.css").to_s, always: false, poll: false, **kwargs)
+        compile_command(input, **kwargs).tap do |command|
           command << "-w"
           command << "always" if always
           command << "-p" if poll
@@ -57,19 +60,17 @@ def engines_tailwindcss_roots
         end.compact
       end
 
-      def enhance_command(command)
+      def with_dynamic_input
         engine_roots = Tailwindcss::Commands.engines_tailwindcss_roots
         if engine_roots.any?
           Tempfile.create('tailwind.css') do |file|
             file.write(engine_roots.map { |root| "@import \"#{root}\";" }.join("\n"))
             file.write("\n@import \"#{Rails.root.join('app/assets/tailwind/application.css')}\";\n")
             file.rewind
-            transformed_command = command.dup
-            transformed_command[2] = file.path
-            yield transformed_command if block_given?
+            yield file.path if block_given?
           end
         else
-          yield command if block_given?
+          yield rails_root.join("app/assets/tailwind/application.css").to_s if block_given?
         end
       end
     end

lib/tasks/build.rake

@@ -4,8 +4,8 @@ namespace :tailwindcss do
     debug = args.extras.include?("debug")
     verbose = args.extras.include?("verbose")
 
-    command = Tailwindcss::Commands.compile_command(debug: debug)
-    Tailwindcss::Commands.enhance_command(command) do |transformed_command|
+    Tailwindcss::Commands.with_dynamic_input do |input|
+      command = Tailwindcss::Commands.compile_command(input, debug: debug)
       env = Tailwindcss::Commands.command_env(verbose: verbose)
       puts "Running: #{Shellwords.join(command)}" if verbose
 
@@ -20,8 +20,8 @@ namespace :tailwindcss do
     always = args.extras.include?("always")
     verbose = args.extras.include?("verbose")
 
-    command = Tailwindcss::Commands.watch_command(always: always, debug: debug, poll: poll)
-    Tailwindcss::Commands.enhance_command(command) do |transformed_command|
+    Tailwindcss::Commands.with_dynamic_input do |input|
+      command = Tailwindcss::Commands.watch_command(input, always: always, debug: debug, poll: poll)
       env = Tailwindcss::Commands.command_env(verbose: verbose)
       puts "Running: #{Shellwords.join(command)}" if verbose
 

test/lib/tailwindcss/commands_test.rb

@@ -11,7 +11,7 @@ def setup
 
   test ".compile_command" do
     Rails.stub(:root, File) do # Rails.root won't work in this test suite
-      actual = Tailwindcss::Commands.compile_command
+      actual = Tailwindcss::Commands.compile_command("app/assets/tailwind/application.css")
       assert_kind_of(Array, actual)
       assert_equal(executable, actual.first)
       assert_includes(actual, "-i")
@@ -212,29 +212,25 @@ def setup
     end
   end
 
-  test ".enhance_command when there are no engines" do
+  test ".with_dynamic_input when there are no engines" do
     Dir.mktmpdir do |tmpdir|
       root = Pathname.new(tmpdir)
-      input_path = root.join("app/assets/tailwind/application.css")
-      output_path = root.join("app/assets/builds/tailwind.css")
-
-      command = ["tailwindcss", "-i", input_path.to_s, "-o", output_path.to_s]
+      input_path = root.join("app/assets/tailwind/application.css").to_s
 
       Rails.stub(:root, root) do
         Tailwindcss::Commands.stub(:engines_tailwindcss_roots, []) do
-          Tailwindcss::Commands.enhance_command(command) do |actual|
-            assert_equal command, actual
+          Tailwindcss::Commands.with_dynamic_input do |actual|
+            assert_equal input_path, actual
           end
         end
       end
     end
   end
 
-  test ".enhance_command when there are engines" do
+  test ".with_dynamic_input when there are engines" do
     Dir.mktmpdir do |tmpdir|
       root = Pathname.new(tmpdir)
-      input_path = root.join("app/assets/tailwind/application.css")
-      output_path = root.join("app/assets/builds/tailwind.css")
+      input_path = root.join("app/assets/tailwind/application.css").to_s
 
       # Create necessary files
       FileUtils.mkdir_p(File.dirname(input_path))
@@ -245,24 +241,16 @@ def setup
       FileUtils.mkdir_p(File.dirname(engine_css_path))
       FileUtils.touch(engine_css_path)
 
-      command = ["tailwindcss", "-i", input_path.to_s, "-o", output_path.to_s]
-
       Rails.stub(:root, root) do
         Tailwindcss::Commands.stub(:engines_tailwindcss_roots, [engine_css_path.to_s]) do
-          Tailwindcss::Commands.enhance_command(command) do |actual|
-            # Command should be modified to use a temporary file
-            assert_equal command[0], actual[0]  # executable
-            assert_equal command[1], actual[1]  # -i flag
-            assert_equal command[3], actual[3]  # -o flag
-            assert_equal command[4], actual[4]  # output path
-
-            temp_path = Pathname.new(actual[2])
-            refute_equal command[2], temp_path.to_s  # input path should be different
+          Tailwindcss::Commands.with_dynamic_input do |actual|
+            temp_path = Pathname.new(actual)
+            refute_equal input_path, temp_path.to_s  # input path should be different
             assert_match(/tailwind\.css/, temp_path.basename.to_s)  # should use temp file
             assert_includes [Dir.tmpdir, '/tmp'], temp_path.dirname.to_s  # should be in temp directory
 
             # Check temp file contents
-            temp_content = File.read(temp_path)
+            temp_content = File.read(actual)
             expected_content = <<~CSS
             @import "#{engine_css_path}";
             @import "#{input_path}";