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, 46 insertions, 0 deletions

diff --git a/activesupport/lib/active_support/core_ext/kernel/reporting.rb b/activesupport/lib/active_support/core_ext/kernel/reporting.rb
new file mode 100644
index 0000000000..232443601c
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/kernel/reporting.rb
@@ -0,0 +1,46 @@
+module Kernel
+  # Sets $VERBOSE to nil for the duration of the block and back to its original value afterwards.
+  #
+  #   silence_warnings do
+  #     value = noisy_call # no warning voiced
+  #   end
+  #
+  #   noisy_call # warning voiced
+  def silence_warnings
+    old_verbose, $VERBOSE = $VERBOSE, nil
+    yield
+  ensure
+    $VERBOSE = old_verbose
+  end
+
+  # Sets $VERBOSE to true for the duration of the block and back to its original value afterwards.
+  def enable_warnings
+    old_verbose, $VERBOSE = $VERBOSE, true
+    yield
+  ensure
+    $VERBOSE = old_verbose
+  end
+
+  # Silences stderr for the duration of the block.
+  #
+  #   silence_stderr do
+  #     $stderr.puts 'This will never be seen'
+  #   end
+  #
+  #   $stderr.puts 'But this will'
+  def silence_stderr
+    old_stderr = STDERR.dup
+    STDERR.reopen(RUBY_PLATFORM =~ /mswin/ ? 'NUL:' : '/dev/null')
+    STDERR.sync = true
+    yield
+  ensure
+    STDERR.reopen(old_stderr)
+  end
+
+  def suppress(*exception_classes)
+    begin yield
+    rescue Exception => e
+      raise unless exception_classes.any? { |cls| e.kind_of?(cls) }
+    end
+  end
+end
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