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

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

Defined Under Namespace

Classes: BlockingInput

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(with_frame_inset: true, merged_output: false, duplicate_output_to: File.open(File::NULL, 'w'), &block) ⇒ Capture

: (?with_frame_inset: bool, ?merged_output: bool, ?duplicate_output_to: IO) { -> void } -> void



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# File 'lib/cli/ui/stdout_router.rb', line 185

def initialize(
  with_frame_inset: true,
  merged_output: false,
  duplicate_output_to: File.open(File::NULL, 'w'),
  &block
)
  @with_frame_inset = with_frame_inset
  @merged_output = merged_output
  @duplicate_output_to = duplicate_output_to
  @block = block
  @print_captured_output = false
  @out = StringIO.new
  @err = StringIO.new
end

Instance Attribute Details

: bool



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# File 'lib/cli/ui/stdout_router.rb', line 201

def print_captured_output
  @print_captured_output
end

Class Method Details

.current_capture ⇒ Object

: -> Capture?



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# File 'lib/cli/ui/stdout_router.rb', line 102

def current_capture
  Thread.current[:cliui_current_capture]
end

.current_capture! ⇒ Object

: -> Capture



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# File 'lib/cli/ui/stdout_router.rb', line 107

def current_capture!
  current_capture #: as !nil
end

.in_alternate_screen(&block) ⇒ Object

: [T] { -> T } -> T



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# File 'lib/cli/ui/stdout_router.rb', line 112

def in_alternate_screen(&block)
  stdin_synchronize do
    previous_print_captured_output = current_capture&.print_captured_output
    current_capture&.print_captured_output = true
    Spinner::SpinGroup.pause_spinners do
      if outermost_uncaptured?
        begin
          prev_hook = Thread.current[:cliui_output_hook]
          Thread.current[:cliui_output_hook] = nil
          replay = current_capture!.stdout.gsub(ANSI.match_alternate_screen, '')
          CLI::UI.raw do
            print("#{ANSI.enter_alternate_screen}#{replay}")
          end
        ensure
          Thread.current[:cliui_output_hook] = prev_hook
        end
      end
      block.call
    ensure
      print(ANSI.exit_alternate_screen) if outermost_uncaptured?
    end
  ensure
    current_capture&.print_captured_output = !!previous_print_captured_output
  end
end

.stdin_synchronize(&block) ⇒ Object

: [T] { -> T } -> T



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# File 'lib/cli/ui/stdout_router.rb', line 139

def stdin_synchronize(&block)
  @stdin_mutex.synchronize do
    case $stdin
    when BlockingInput
      $stdin.synchronize do
        block.call
      end
    else
      block.call
    end
  end
end

.with_stdin_masked(&block) ⇒ Object

: [T] { -> T } -> T



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# File 'lib/cli/ui/stdout_router.rb', line 153

def with_stdin_masked(&block)
  @capture_mutex.synchronize do
    if @active_captures.zero?
      @stdin_mutex.synchronize do
        @saved_stdin = $stdin
        $stdin = BlockingInput.new(@saved_stdin)
      end
    end
    @active_captures += 1
  end

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

Instance Method Details

#run ⇒ Object

: -> untyped



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# File 'lib/cli/ui/stdout_router.rb', line 204

def run
  require 'stringio'

  StdoutRouter.assert_enabled!

  Thread.current[:cliui_current_capture] = self

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

  if Thread.current.respond_to?(:report_on_exception)
    Thread.current.report_on_exception = false
  end

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

    @block.call
  end
ensure
  Thread.current[:cliui_output_hook] = prev_hook
  Thread.current[:no_cliui_frame_inset] = prev_frame_inset
  Thread.current[:cliui_current_capture] = nil
end

#stderr ⇒ Object

: -> String



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# File 'lib/cli/ui/stdout_router.rb', line 247

def stderr
  @err.string
end

#stdout ⇒ Object

: -> String



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# File 'lib/cli/ui/stdout_router.rb', line 242

def stdout
  @out.string
end