59 lines
1.5 KiB
Ruby
59 lines
1.5 KiB
Ruby
module Kernel
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# Sets $VERBOSE to nil for the duration of the block and back to its original value afterwards.
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#
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# silence_warnings do
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# value = noisy_call # no warning voiced
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# end
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#
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# noisy_call # warning voiced
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def silence_warnings
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old_verbose, $VERBOSE = $VERBOSE, nil
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yield
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ensure
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$VERBOSE = old_verbose
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end
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# Sets $VERBOSE to true for the duration of the block and back to its original value afterwards.
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def enable_warnings
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old_verbose, $VERBOSE = $VERBOSE, true
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yield
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ensure
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$VERBOSE = old_verbose
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end
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# For compatibility
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def silence_stderr #:nodoc:
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silence_stream(STDERR) { yield }
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end
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# Silences any stream for the duration of the block.
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#
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# silence_stream(STDOUT) do
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# puts 'This will never be seen'
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# end
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#
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# puts 'But this will'
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def silence_stream(stream)
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old_stream = stream.dup
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stream.reopen(RUBY_PLATFORM =~ /(:?mswin|mingw)/ ? 'NUL:' : '/dev/null')
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stream.sync = true
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yield
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ensure
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stream.reopen(old_stream)
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end
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# Blocks and ignores any exception passed as argument if raised within the block.
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#
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# suppress(ZeroDivisionError) do
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# 1/0
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# puts "This code is NOT reached"
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# end
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#
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# puts "This code gets executed and nothing related to ZeroDivisionError was seen"
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def suppress(*exception_classes)
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begin yield
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rescue Exception => e
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raise unless exception_classes.any? { |cls| e.kind_of?(cls) }
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end
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end
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end |