feat: make input and output filenames for build and watch configurable

Author: JanNash

lib/tailwindcss/commands.rb

@@ -3,14 +3,16 @@
 module Tailwindcss
   module Commands
     class << self
-      def compile_command(debug: false, **kwargs)
+      def compile_command(debug: false, namespace: nil, **kwargs)
         debug = ENV["TAILWINDCSS_DEBUG"].present? if ENV.key?("TAILWINDCSS_DEBUG")
         rails_root = defined?(Rails) ? Rails.root : Pathname.new(Dir.pwd)
 
+        input_filename, output_filename = get_input_and_output_filename(namespace)
+
         command = [
           Tailwindcss::Ruby.executable(**kwargs),
-          "-i", rails_root.join("app/assets/tailwind/application.css").to_s,
-          "-o", rails_root.join("app/assets/builds/tailwind.css").to_s,
+          "-i", rails_root.join("app/assets/tailwind/#{input_filename}.css").to_s,
+          "-o", rails_root.join("app/assets/builds/#{output_filename}.css").to_s,
         ]
 
         command << "--minify" unless (debug || rails_css_compressor?)
@@ -35,9 +37,27 @@ def command_env(verbose:)
         end
       end
 
+      private
+
       def rails_css_compressor?
         defined?(Rails) && Rails&.application&.config&.assets&.css_compressor.present?
       end
+
+      def get_input_and_output_filename(namespace)
+        if namespace != nil
+          unless File.exist?("app/assets/tailwind/#{namespace}.css")
+            raise "No file named #{namespace}.css exists in app/assets/tailwind"
+          end
+
+          if namespace == "application"
+            raise "application.css is the default input file for tailwind and cannot be used as namespace. If you want the normal behaviour of tailwindcss (to compile application.css into tailwind.css), just omit the namespace parameter."
+          end
+        end
+
+        input_filename = namespace || "application"
+        output_filename = namespace || "tailwind"
+        return input_filename, output_filename
+      end
     end
   end
 end

lib/tasks/build.rake

@@ -4,7 +4,9 @@ namespace :tailwindcss do
     debug = args.extras.include?("debug")
     verbose = args.extras.include?("verbose")
 
-    command = Tailwindcss::Commands.compile_command(debug: debug)
+    namespace = get_namespace_from_extras(args.extras)
+
+    command = Tailwindcss::Commands.compile_command(debug: debug, namespace: namespace)
     env = Tailwindcss::Commands.command_env(verbose: verbose)
     puts "Running: #{Shellwords.join(command)}" if verbose
 
@@ -18,14 +20,25 @@ namespace :tailwindcss do
     always = args.extras.include?("always")
     verbose = args.extras.include?("verbose")
 
-    command = Tailwindcss::Commands.watch_command(always: always, debug: debug, poll: poll)
+    namespace = get_namespace_from_extras(args.extras)
+
+    command = Tailwindcss::Commands.watch_command(always: always, debug: debug, namespace: namespace, poll: poll)
     env = Tailwindcss::Commands.command_env(verbose: verbose)
     puts "Running: #{Shellwords.join(command)}" if verbose
 
     system(env, *command)
   rescue Interrupt
     puts "Received interrupt, exiting tailwindcss:watch" if args.extras.include?("verbose")
   end
+
+  private
+
+  def get_namespace_from_extras(extras)
+    namespace_key_and_value = extras.detect{ |a| a.start_with?('namespace=') }
+    if namespace_key_and_value != nil
+      namespace_key_and_value.split('=')[1]
+    end
+  end
 end
 
 Rake::Task["assets:precompile"].enhance(["tailwindcss:build"])