Methods
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Instance Public methods
capture(stream)
Link
Captures the given stream and returns it:
stream = capture(:stdout) { puts 'notice' }
stream # => "notice\n"
stream = capture(:stderr) { warn 'error' }
stream # => "error\n"
even for subprocesses:
stream = capture(:stdout) { system('echo notice') }
stream # => "notice\n"
stream = capture(:stderr) { system('echo error 1>&2') }
stream # => "error\n"
Also aliased as: silence
# File activesupport/lib/active_support/core_ext/kernel/reporting.rb, line 82 def capture(stream) stream = stream.to_s captured_stream = Tempfile.new(stream) stream_io = eval("$#{stream}") origin_stream = stream_io.dup stream_io.reopen(captured_stream) yield stream_io.rewind return captured_stream.read ensure captured_stream.close captured_stream.unlink stream_io.reopen(origin_stream) end
class_eval(*args, &block)
Link
#class_eval on an object acts like singleton_class.class_eval.
debugger()
Link
Starts a debugging session if the debugger
gem has been loaded
(call rails server –debugger to do load it).
Also aliased as: breakpoint
# File activesupport/lib/active_support/core_ext/kernel/debugger.rb, line 4 def debugger message = "\n***** Debugger requested, but was not available (ensure the debugger gem is listed in Gemfile/installed as gem): Start server with --debugger to enable *****\n" defined?(Rails) ? Rails.logger.info(message) : $stderr.puts(message) end
enable_warnings()
Link
Sets $VERBOSE to true
for the duration of the block and back
to its original value afterwards.
quietly()
Link
Silences both STDOUT and STDERR, even for subprocesses.
quietly { system 'bundle install' }
silence_stream(stream)
Link
Silences any stream for the duration of the block.
silence_stream(STDOUT) do
puts 'This will never be seen'
end
puts 'But this will'
# File activesupport/lib/active_support/core_ext/kernel/reporting.rb, line 44 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) old_stream.close end
silence_warnings()
Link
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
suppress(*exception_classes)
Link
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'
with_warnings(flag)
Link
Sets $VERBOSE for the duration of the block and back to its original value afterwards.