Module: Kennel::Utils

Defined in:
lib/kennel/utils.rb

Defined Under Namespace

Classes: TeeIO

Constant Summary collapse

COLORS = 
{ red: 31, green: 32, yellow: 33, cyan: 36, magenta: 35, default: 0 }.freeze

Class Method Summary collapse

Class Method Details

.ask(question) ⇒ Object 



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# File 'lib/kennel/utils.rb', line 28

def ask(question)
  Kennel.err.printf color(:red, "#{question} -  press 'y' to continue: ")
  begin
    STDIN.gets.chomp == "y"
  rescue Interrupt # do not show a backtrace if user decides to Ctrl+C here
    Kennel.err.print "\n"
    exit 1
  end
end

.capture_sh(command) ⇒ Object 



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# File 'lib/kennel/utils.rb', line 77

def capture_sh(command)
  result = `#{command} 2>&1`
  raise "Command failed:\n#{command}\n#{result}" unless $CHILD_STATUS.success?
  result
end

.capture_stderr ⇒ Object 



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# File 'lib/kennel/utils.rb', line 55

def capture_stderr
  old = Kennel.err
  Kennel.err = StringIO.new
  yield
  Kennel.err.string
ensure
  Kennel.err = old
end

.capture_stdout ⇒ Object 



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# File 'lib/kennel/utils.rb', line 46

def capture_stdout
  old = Kennel.out
  Kennel.out = StringIO.new
  yield
  Kennel.out.string
ensure
  Kennel.out = old
end

.color(color, text) ⇒ Object 



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# File 'lib/kennel/utils.rb', line 38

def color(color, text)
  "\e[#{COLORS.fetch(color)}m#{text}\e[0m"
end

.natural_order(name) ⇒ Object 



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# File 'lib/kennel/utils.rb', line 114

def natural_order(name)
  name.split(/(\d+)/).each_with_index.map { |x, i| i.odd? ? x.to_i : x }
end

.parallel(items, max: 10) ⇒ Object 



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# File 'lib/kennel/utils.rb', line 91

def parallel(items, max: 10)
  threads = [items.size, max].min
  work = items.each_with_index.to_a
  done = Array.new(items.size)
  workers = Array.new(threads).map do
    Thread.new do
      loop do
        item, i = work.pop
        break unless i
        done[i] =
          begin
            yield item
          rescue StandardError => e
            work.clear
            e
          end
      end
    end
  end
  workers.each(&:join)
  done.each { |d| raise d if d.is_a?(StandardError) }
end

.path_to_url(path) ⇒ Object 



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# File 'lib/kennel/utils.rb', line 83

def path_to_url(path)
  if subdomain = ENV["DATADOG_SUBDOMAIN"]
    "https://#{subdomain}.datadoghq.com#{path}"
  else
    path
  end
end

.presence(value) ⇒ Object 



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# File 'lib/kennel/utils.rb', line 24

def presence(value)
  value.nil? || value.empty? ? nil : value
end

.retry(*errors, times:) ⇒ Object 



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# File 'lib/kennel/utils.rb', line 118

def retry(*errors, times:)
  yield
rescue *errors => e
  times -= 1
  raise if times < 0
  Kennel.err.puts "Error #{e}, #{times} retries left"
  retry
end

.snake_case(string) ⇒ Object 



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# File 'lib/kennel/utils.rb', line 17

def snake_case(string)
  string.gsub(/::/, "_") # Foo::Bar -> foo_bar
    .gsub(/([A-Z]+)([A-Z][a-z])/, '\1_\2') # FOOBar -> foo_bar
    .gsub(/([a-z\d])([A-Z])/, '\1_\2') # fooBar -> foo_bar
    .downcase
end

.strip_shell_control(text) ⇒ Object 



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# File 'lib/kennel/utils.rb', line 42

def strip_shell_control(text)
  text.gsub(/\e\[\d+m(.*?)\e\[0m/, "\\1").gsub(/.#{Regexp.escape("\b")}/, "")
end

.tee_output ⇒ Object 



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# File 'lib/kennel/utils.rb', line 64

def tee_output
  old_stdout = Kennel.out
  old_stderr = Kennel.err
  capture = StringIO.new
  Kennel.out = TeeIO.new([capture, Kennel.out])
  Kennel.err = TeeIO.new([capture, Kennel.err])
  yield
  capture.string
ensure
  Kennel.out = old_stdout
  Kennel.err = old_stderr
end