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Contents
# TITLE:
# Verbosity Reporting Extensions
#
# DESCRIPTION:
# Kernel extensions dealing with verbosity of warnings
# and error messages.
#
# AUTHORS:
# - David Heinemeier Hansson
# - TransSilentNight
#
# LOG:
# - trans 07.09.01 Deprecated #silently as alias of slience_warnings.
module Kernel
module_function
# Silences any stream for the duration of the block.
#
# silence_stream(STDOUT) do
# puts 'This will never be seen'
# end
#
# puts 'But this will'
def silence_stream(stream)
old_stream = stream.dup
stream.reopen(RUBY_PLATFORM =~ /mswin/ ? 'NUL:' : '/dev/null')
stream.sync = true
yield
ensure
stream.reopen(old_stream)
end
#alias_method :silently, :silence_stream
# For compatibility
def silence_stderr #:nodoc:
silence_stream(STDERR) { yield }
end
# 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
# Supress errors while executing a block, with execptions.
def suppress(*exception_classes)
begin yield
rescue Exception => e
raise unless exception_classes.any? { |cls| e.kind_of?(cls) }
end
end
end
=begin test
require 'test/unit'
class TestKernelError < Test::Unit::TestCase
def test_silently
silently do
assert( ! $VERBOSE )
end
end
end
=end
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10 entries across 10 versions & 1 rubygems