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Kernel

Public Instance Methods

breakpoint() click to toggle source
Alias for: debugger
capture(stream) click to toggle source

Captures the given stream and returns it:

  stream = capture(:stdout) { puts "Cool" }
  stream # => "Cool\n"
    # File lib/active_support/core_ext/kernel/reporting.rb, line 68
68:   def capture(stream)
69:     begin
70:       stream = stream.to_s
71:       eval "$#{stream} = StringIO.new"
72:       yield
73:       result = eval("$#{stream}").string
74:     ensure
75:       eval("$#{stream} = #{stream.upcase}")
76:     end
77: 
78:     result
79:   end
Also aliased as: silence
class_eval(*args, &block) click to toggle source

class_eval on an object acts like singleton_class.class_eval.

    # File lib/active_support/core_ext/kernel/singleton_class.rb, line 10
10:   def class_eval(*args, &block)
11:     singleton_class.class_eval(*args, &block)
12:   end
debugger() click to toggle source

Starts a debugging session if ruby-debug has been loaded (call rails server —debugger to do load it).

   # File lib/active_support/core_ext/kernel/debugger.rb, line 4
4:     def debugger
5:       message = "\n***** Debugger requested, but was not available (ensure ruby-debug is listed in Gemfile/installed as gem): Start server with --debugger to enable *****\n"
6:       defined?(Rails) ? Rails.logger.info(message) : $stderr.puts(message)
7:     end
Also aliased as: breakpoint
enable_warnings() click to toggle source

Sets $VERBOSE to true for the duration of the block and back to its original value afterwards.

    # File lib/active_support/core_ext/kernel/reporting.rb, line 15
15:   def enable_warnings
16:     with_warnings(true) { yield }
17:   end
quietly() click to toggle source

Silences both STDOUT and STDERR, even for subprocesses.

  quietly { system 'bundle install' }
    # File lib/active_support/core_ext/kernel/reporting.rb, line 86
86:   def quietly
87:     silence_stream(STDOUT) do
88:       silence_stream(STDERR) do
89:         yield
90:       end
91:     end
92:   end
silence(stream) click to toggle source
Alias for: capture
silence_stream(stream) click to toggle source

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 lib/active_support/core_ext/kernel/reporting.rb, line 39
39:   def silence_stream(stream)
40:     old_stream = stream.dup
41:     stream.reopen(RbConfig::CONFIG['host_os'] =~ /mswin|mingw/ ? 'NUL:' : '/dev/null')
42:     stream.sync = true
43:     yield
44:   ensure
45:     stream.reopen(old_stream)
46:   end
silence_warnings() click to toggle source

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
    # File lib/active_support/core_ext/kernel/reporting.rb, line 10
10:   def silence_warnings
11:     with_warnings(nil) { yield }
12:   end
singleton_class() click to toggle source

Returns the object’s singleton class.

   # File lib/active_support/core_ext/kernel/singleton_class.rb, line 3
3:   def singleton_class
4:     class << self
5:       self
6:     end
7:   end
suppress(*exception_classes) click to toggle source

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"
    # File lib/active_support/core_ext/kernel/reporting.rb, line 56
56:   def suppress(*exception_classes)
57:     begin yield
58:     rescue Exception => e
59:       raise unless exception_classes.any? { |cls| e.kind_of?(cls) }
60:     end
61:   end
with_warnings(flag) click to toggle source

Sets $VERBOSE for the duration of the block and back to its original value afterwards.

    # File lib/active_support/core_ext/kernel/reporting.rb, line 20
20:   def with_warnings(flag)
21:     old_verbose, $VERBOSE = $VERBOSE, flag
22:     yield
23:   ensure
24:     $VERBOSE = old_verbose
25:   end

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