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tag: v3.1.0.rc7
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require 'rbconfig'
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
with_warnings(nil) { yield }
end
# Sets $VERBOSE to true for the duration of the block and back to its original value afterwards.
def enable_warnings
with_warnings(true) { yield }
end
# Sets $VERBOSE for the duration of the block and back to its original value afterwards.
def with_warnings(flag)
old_verbose, $VERBOSE = $VERBOSE, flag
yield
ensure
$VERBOSE = old_verbose
end
# For compatibility
def silence_stderr #:nodoc:
silence_stream(STDERR) { yield }
end
# Silences any stream for the duration of the block.
#
# silence_stream(STDOUT) do
# puts 'This will never be seen'
# end
#
# puts 'But this will'
def silence_stream(stream)
old_stream = stream.dup
stream.reopen(RbConfig::CONFIG['host_os'] =~ /mswin|mingw/ ? 'NUL:' : '/dev/null')
stream.sync = true
yield
ensure
stream.reopen(old_stream)
end
# Blocks and ignores any exception passed as argument if raised within the block.
#
# suppress(ZeroDivisionError) do
# 1/0
# puts "This code is NOT reached"
# end
#
# puts "This code gets executed and nothing related to ZeroDivisionError was seen"
def suppress(*exception_classes)
begin yield
rescue Exception => e
raise unless exception_classes.any? { |cls| e.kind_of?(cls) }
end
end
# Captures the given stream and returns it:
#
# stream = capture(:stdout) { puts "Cool" }
# stream # => "Cool\n"
#
def capture(stream)
begin
stream = stream.to_s
eval "$#{stream} = StringIO.new"
yield
result = eval("$#{stream}").string
ensure
eval("$#{stream} = #{stream.upcase}")
end
result
end
alias :silence :capture
# Silences both STDOUT and STDERR, even for subprocesses.
#
# quietly { system 'bundle install' }
#
def quietly
silence_stream(STDOUT) do
silence_stream(STDERR) do
yield
end
end
end
end
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