Added Kernel#daemonize to turn the current process into a daemon that can be killed with a TERM signal [DHH] Refactored stuff lingering in kernel.rb to the appropriate places

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3714 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

1 files changed, 24 insertions, 0 deletions

diff --git a/activesupport/lib/active_support/core_ext/kernel/requires.rb b/activesupport/lib/active_support/core_ext/kernel/requires.rb
new file mode 100644
index 0000000000..323fea49fe
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/kernel/requires.rb
@@ -0,0 +1,24 @@
+module Kernel
+  # Require a library with fallback to RubyGems.  Warnings during library
+  # loading are silenced to increase signal/noise for application warnings.
+  def require_library_or_gem(library_name)
+    silence_warnings do
+      begin
+        require library_name
+      rescue LoadError => cannot_require
+        # 1. Requiring the module is unsuccessful, maybe it's a gem and nobody required rubygems yet. Try.
+        begin
+          require 'rubygems'
+        rescue LoadError => rubygems_not_installed
+          raise cannot_require
+        end
+        # 2. Rubygems is installed and loaded. Try to load the library again
+        begin
+          require library_name
+        rescue LoadError => gem_not_installed
+          raise cannot_require
+        end
+      end
+    end
+  end
+end
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