class IRB::Pager

# File lib/irb/pager.rb, line 20
def page(retain_content: false)
  if should_page? && pager = setup_pager(retain_content: retain_content)
    begin
      pid = pager.pid
      yield pager
    ensure
      pager.close
    end
  else
    yield $stdout
  end
# When user presses Ctrl-C, IRB would raise `IRB::Abort`
# But since Pager is implemented by running paging commands like `less` in another process with `IO.popen`,
# the `IRB::Abort` exception only interrupts IRB's execution but doesn't affect the pager
# So to properly terminate the pager with Ctrl-C, we need to catch `IRB::Abort` and kill the pager process
rescue IRB::Abort
  begin
    begin
      Process.kill("TERM", pid) if pid
    rescue Errno::EINVAL
      # SIGTERM not supported (windows)
      Process.kill("KILL", pid)
    end
  rescue Errno::ESRCH
    # Pager process already terminated
  end
  nil
rescue Errno::EPIPE
end

# File lib/irb/pager.rb, line 10
def page_content(content, **options)
  if content_exceeds_screen_height?(content)
    page(**options) do |io|
      io.puts content
    end
  else
    $stdout.puts content
  end
end