Module: Pager

Included in:
USaidWat::Application::Command
Defined in:
lib/usaidwat/pager.rb

Instance Method Summary collapse

Instance Method Details

#page ⇒ Object 



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# File 'lib/usaidwat/pager.rb', line 2

def page
  return if RUBY_PLATFORM =~ /win32/
  return unless STDOUT.tty?

  read, write = IO.pipe

  unless Kernel.fork # Child process
    STDOUT.reopen(write)
    STDERR.reopen(write) if STDERR.tty?
    read.close
    write.close
    return
  end

  # Parent process, become pager
  STDIN.reopen(read)
  read.close
  write.close

  ENV['LESS'] = 'FSRX' unless ENV['LESS']

  Kernel.select [STDIN] # Wait until we have input before we start the pager
  pager = ENV['PAGER'] || 'less'
  exec pager rescue exec "/bin/sh", "-c", pager
rescue StandardError
end