activesupport/lib/active_support/core_ext/kernel/reporting.rb


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44

# frozen_string_literal: true
module Kernel
  module_function

  # 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

  # 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)
    yield
  rescue *exception_classes
  end
end