detect being inside a rails application even from a subdirectory

Signed-off-by: NDavid Heinemeier Hansson <david@loudthinking.com>

railties/CHANGELOG

+*Rails 3.0.0 [Release Candidate] (unreleased)*
+
+* Made the rails command work even when you're in a subdirectory [Chad Fowler]
+
+
 *Rails 3.0.0 [beta 4] (June 8th, 2010)*
 
 * Version bump

railties/lib/rails/cli.rb

 require 'rbconfig'
-
-module Rails
-  module ScriptRailsLoader
-    RUBY = File.join(*RbConfig::CONFIG.values_at("bindir", "ruby_install_name")) + RbConfig::CONFIG["EXEEXT"]
-    SCRIPT_RAILS = File.join('script', 'rails')
-
-    def self.exec_script_rails!
-      cwd = Dir.pwd
-      exec RUBY, SCRIPT_RAILS, *ARGV if File.exists?(SCRIPT_RAILS)
-      Dir.chdir("..") do
-        # Recurse in a chdir block: if the search fails we want to be sure
-        # the application is generated in the original working directory.
-        exec_script_rails! unless cwd == Dir.pwd
-      end
-    rescue SystemCallError
-      # could not chdir, no problem just return
-    end
-  end
-end
+require 'rails/script_rails_loader'
 
 Rails::ScriptRailsLoader.exec_script_rails!
 

railties/lib/rails/script_rails_loader.rb

+require 'pathname'
+
+module Rails
+  module ScriptRailsLoader
+    RUBY = File.join(*RbConfig::CONFIG.values_at("bindir", "ruby_install_name")) + RbConfig::CONFIG["EXEEXT"]
+    SCRIPT_RAILS = File.join('script', 'rails')
+
+    def self.exec_script_rails!
+      cwd = Dir.pwd
+      exec RUBY, SCRIPT_RAILS, *ARGV if in_rails_application?
+      Dir.chdir("..") do
+        # Recurse in a chdir block: if the search fails we want to be sure
+        # the application is generated in the original working directory.
+        exec_script_rails! unless cwd == Dir.pwd
+      end
+    rescue SystemCallError
+      # could not chdir, no problem just return
+    end
+    
+    def self.in_rails_application?
+      File.exists?(SCRIPT_RAILS) || in_rails_application_subdirectory?
+    end
+    
+    def self.in_rails_application_subdirectory?(path = Pathname.new(Dir.pwd))
+      File.exists?(File.join(path, SCRIPT_RAILS)) || !path.root? && in_rails_application_subdirectory?(path.parent)
+    end
+  end
+end
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railties/test/script_rails_loader_test.rb

+require 'abstract_unit'
+require 'rails/script_rails_loader'
+
+class ScriptRailsLoaderTest < ActiveSupport::TestCase
+  
+  test "is in a rails application if script/rails exists" do
+    File.stubs(:exists?).returns(true)
+    assert Rails::ScriptRailsLoader.in_rails_application?
+  end
+  
+  test "is in a rails application if parent directory has script/rails" do
+    File.stubs(:exists?).with("/foo/bar/script/rails").returns(false)
+    File.stubs(:exists?).with("/foo/script/rails").returns(true)
+    assert Rails::ScriptRailsLoader.in_rails_application_subdirectory?(Pathname.new("/foo/bar"))
+  end
+  
+  test "is not in a rails application if at the root directory and doesn't have script/rails" do
+    Pathname.any_instance.stubs(:root?).returns true
+    assert !Rails::ScriptRailsLoader.in_rails_application?
+  end
+  
+end
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