From abfa78889171571bd6781c60a3c201b1715d807f Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Wed, 17 Feb 2021 14:50:53 +0900
Subject: [PATCH] Add -C/--directory option the same as GNU make

---
 lib/rake/application.rb               |  7 +++++++
 test/test_rake_application_options.rb | 22 ++++++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/lib/rake/application.rb b/lib/rake/application.rb
index 9ac9b2130..02586ad5e 100644
--- a/lib/rake/application.rb
+++ b/lib/rake/application.rb
@@ -433,6 +433,13 @@ def standard_rake_options # :nodoc:
               select_tasks_to_show(options, :describe, value)
             }
           ],
+          ["--directory", "-C [DIRECTORY]",
+            "Change to DIRECTORY before doing anything.",
+            lambda { |value|
+              Dir.chdir value
+              @original_dir = Dir.pwd
+            }
+          ],
           ["--dry-run", "-n",
             "Do a dry run without executing actions.",
             lambda { |value|
diff --git a/test/test_rake_application_options.rb b/test/test_rake_application_options.rb
index 0ca06e264..288085938 100644
--- a/test/test_rake_application_options.rb
+++ b/test/test_rake_application_options.rb
@@ -65,6 +65,28 @@ def test_describe_with_pattern
     end
   end
 
+  def test_directory
+    pwd = Dir.pwd
+    [["--directory"], "--directory=", ["-C"], "-C"].each do |flag|
+      Dir.mktmpdir do |dir|
+        begin
+          flags(flag.dup << dir) do
+            assert_equal(File.realpath(dir), @app.original_dir)
+          end
+        ensure
+          Dir.chdir(pwd)
+        end
+        begin
+          assert_raises(Errno::ENOENT) do
+            flags(flag.dup << dir+"/nonexistent")
+          end
+        ensure
+          Dir.chdir(pwd)
+        end
+      end
+    end
+  end
+
   def test_execute
     $xyzzy = 0
     flags("--execute=$xyzzy=1", "-e $xyzzy=1") do