Show variants in -T output

lib/rscons/application.rb

@@ -69,12 +69,12 @@ module Rscons
       end
       @script = Script.new
       @script.load(rsconscript)
+      enable_variants
       if show_tasks
         show_script_tasks
         return 0
       end
       apply_task_params(tasks_and_params)
-      enable_variants
       if tasks_and_params.empty?
         check_process_environments
         if Task.tasks["default"]
@@ -354,6 +354,15 @@ module Rscons
           end
         end
       end
+
+      unless @variant_groups.empty?
+        @variant_groups.each do |variant_group|
+          puts "\nVariant group#{variant_group[:name] ? " '#{variant_group[:name]}'" : ""}:"
+          variant_group[:variants].each do |variant|
+            puts "  #{variant[:name]}#{variant[:enabled] ? " (enabled)" : ""}"
+          end
+        end
+      end
     end
 
     def apply_task_params(tasks_and_params)

spec/build_tests_spec.rb

@@ -3185,6 +3185,37 @@ EOF
       expect(result.stdout).to match %r{two enabled}
       expect(result.stdout).to_not match %r{three enabled}
     end
+
+    it "shows available variants with -T" do
+      test_dir "variants"
+
+      result = run_rscons(args: %w[-f multiple_groups.rb -T])
+      expect(result.stderr).to eq ""
+      expect(result.status).to eq 0
+      verify_lines(lines(result.stdout), [
+        "Variant group 'desktop-environment':",
+        "  kde (enabled)",
+        "  gnome (enabled)",
+        "Variant group 'debug':",
+        "  debug (enabled)",
+        "  release (enabled)",
+      ])
+
+      result = run_rscons(args: %w[-f multiple_groups.rb -e gnome,release configure])
+      expect(result.stderr).to eq ""
+      expect(result.status).to eq 0
+      result = run_rscons(args: %w[-f multiple_groups.rb -T])
+      expect(result.stderr).to eq ""
+      expect(result.status).to eq 0
+      verify_lines(lines(result.stdout), [
+        "Variant group 'desktop-environment':",
+        "  kde",
+        "  gnome (enabled)",
+        "Variant group 'debug':",
+        "  debug",
+        "  release (enabled)",
+      ])
+    end
   end
 
   context "build_dir method" do