Class: CLI::UI::StdoutRouter::Capture

Inherits:
Object
  • Object
show all
Defined in:
lib/cli/ui/stdout_router.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*block_args, with_frame_inset: true, &block) ⇒ Capture

Returns a new instance of Capture.


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# File 'lib/cli/ui/stdout_router.rb', line 86

def initialize(*block_args, with_frame_inset: true, &block)
  @with_frame_inset = with_frame_inset
  @block_args = block_args
  @block = block
end

Instance Attribute Details

#stderr ⇒ Object (readonly)

Returns the value of attribute stderr


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# File 'lib/cli/ui/stdout_router.rb', line 92

def stderr
  @stderr
end

#stdout ⇒ Object (readonly)

Returns the value of attribute stdout


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# File 'lib/cli/ui/stdout_router.rb', line 92

def stdout
  @stdout
end

Class Method Details

.with_stdin_masked ⇒ Object 


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# File 'lib/cli/ui/stdout_router.rb', line 65

def self.with_stdin_masked
  @m.synchronize do
    if @active_captures.zero?
      @saved_stdin = $stdin
      $stdin, w = IO.pipe
      $stdin.close
      w.close
    end
    @active_captures += 1
  end

  yield
ensure
  @m.synchronize do
    @active_captures -= 1
    if @active_captures.zero?
      $stdin = @saved_stdin
    end
  end
end

Instance Method Details

#run ⇒ Object 


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# File 'lib/cli/ui/stdout_router.rb', line 94

def run
  require 'stringio'

  StdoutRouter.assert_enabled!

  out = StringIO.new
  err = StringIO.new

  prev_frame_inset = Thread.current[:no_cliui_frame_inset]
  prev_hook = Thread.current[:cliui_output_hook]

  self.class.with_stdin_masked do
    Thread.current[:no_cliui_frame_inset] = !@with_frame_inset
    Thread.current[:cliui_output_hook] = ->(data, stream) do
      case stream
      when :stdout then out.write(data)
      when :stderr then err.write(data)
      else raise
      end
      false # suppress writing to terminal
    end

    begin
      @block.call(*@block_args)
    ensure
      @stdout = out.string
      @stderr = err.string
    end
  end
ensure
  Thread.current[:cliui_output_hook] = prev_hook
  Thread.current[:no_cliui_frame_inset] = prev_frame_inset
end