Module: Doing::Pager

Defined in:
lib/doing/pager.rb

Overview

Pagination

Class Method Summary collapse

Class Method Details

.page(text) ⇒ Object

Page output. If @paginate is false, just dump to STDOUT

Parameters:

  • text (String) —

    text to paginate



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# File 'lib/doing/pager.rb', line 25

def page(text)
  unless @paginate
    puts text
    return
  end

  pager = which_pager
  Doing.logger.debug('Pager:', "Using #{pager}")

  read_io, write_io = IO.pipe

  input = $stdin

  pid = Kernel.fork do
    write_io.close
    input.reopen(read_io)
    read_io.close

    # Wait until we have input before we start the pager
    IO.select [input]

    begin
      exec(pager)
    rescue SystemCallError => e
      raise Errors::DoingStandardError, "Pager error, #{e}"
    end
  end

  begin
    read_io.close
    write_io.write(text)
    write_io.close
  rescue SystemCallError # => e
    # raise Errors::DoingStandardError, "Pager error, #{e}"
  end

  _, status = Process.waitpid2(pid)
  status.success?
end

.paginate ⇒ Object

Boolean determines whether output is paginated



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# File 'lib/doing/pager.rb', line 9

def paginate
  @paginate ||= false
end

.paginate=(should_paginate) ⇒ Object

Enable/disable pagination

Parameters:

  • should_paginate (Boolean) —

    true to paginate



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# File 'lib/doing/pager.rb', line 16

def paginate=(should_paginate)
  @paginate = should_paginate
end