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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
# For compatibility
def silence_stderr #:nodoc:
silence_stream(STDERR) { yield }
end
# 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
# Blocks and ignores any exception passed as argument if raised within the block.
#
# suppress(ZeroDivisionError) do
# 1/0
# puts "This code is NOT reached"
# end
#
# puts "This code gets executed and nothing related to ZeroDivisionError was seen"
def suppress(*exception_classes)
begin yield
rescue Exception => e
raise unless exception_classes.any? { |cls| e.kind_of?(cls) }
end
end
end
Version data entries
80 entries across 77 versions & 20 rubygems