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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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