Re: [Bug-apl] Is there a way to clear the screen?

[Elias Mårtenson]

That's because control-l is a readline feature.

Regards,
Elias

On 28 May 2014 00:40, "Juergen Sauermann" <address@hidden> wrote:

Hi,

in immediate execution mode you can do:

      )HOST tput clear

which is rather portable. In programs, you can do the same:

      'lib_file_io.so' ⎕FX 'FILE_IO' ◊ FILE_IO[25] FILE_IO[24] 'tput clear > /dev/tty'

Interestingly the ^L (aka ⎕AV[13]) is printed::


address@hidden:~/projects/juergen/apl-1.3/src$ ./apl > x
... typing blindly ...
address@hidden:~/projects/juergen/apl-1.3/src$ vi x


                    ______ _   __ __  __    ___     ____   __
                   / ____// | / // / / /   /   |   / __ \ / /
                  / / __ /  |/ // / / /   / /| |  / /_/ // /
                 / /_/ // /|  // /_/ /   / ___ | / ____// /___
                 \____//_/ |_/ \____/   /_/  |_|/_/    /_____/

                     Welcome to GNU APL version 1.3 / 6786

                Copyright (C) 2008-2014  Dr. Jürgen Sauermann
                       Banner by FIGlet: www.figlet.org

                This program comes with ABSOLUTELY NO WARRANTY;
                         for details run: ./apl --gpl.

     This program is free software, and you are welcome to redistribute it
         according to the GNU Public License (GPL) version 3 or later.

^[[30m^[[47m^[[K      ⎕AV[13]
^[[30m^[[48m^[[K^L
^[[30m^[[47m^[[K      )off
^[[m^[(B^[[K^[[30m^[[48m^[[K
Goodbye.
"x" 23L, 1104C                                                11,24         All

If I "cat" the same file then the screen is not cleared.

On 05/27/2014 02:46 AM, Elias Mårtenson wrote:

That's a very alluring thing. :-)  It's bad though, since it will come out as garbage if the output device does not support it.

Regards,
Elias

On 27 May 2014 08:43, "Frederick H. Pitts" <address@hidden> wrote:

Blake,

        If you are looking for instant gratification,

⍞ ← (⎕UCS 27), '[2J'

will do the job on any terminal that honors ansi escape sequences.

Regards,

Fred
Retired Chemical Engineer

On Mon, 2014-05-26 at 19:29 -0500, Blake McBride wrote:
> Dear Elias,
>
>
> On one hand, I would still love to see a basic ^L ability without
> having to get into external code.
>
>
> On the other hand, perhaps I should start to take a look at library
> code.  (I actually have over 20 years of C experience.)  I fear my
> reaction once I see how it works.  I'm sure the possibilities are
> endless.  I haven't even looked at it yet.  Is there a hello world
> sample?
>
>
> Thanks.
>
>
> Blake
>
>
>
>
> On Mon, May 26, 2014 at 6:47 PM, Elias Mårtenson <address@hidden>
> wrote:
>         The correct way to do that is to use the native interface to
>         provide an interface to Curses. It should be fairly trivial to
>         implement.
>
>
>         On 27 May 2014 07:32, "Blake McBride" <address@hidden>
>         wrote:
>         >
>         > If I execute ⎕AV[8] the terminal sounds the bell.  If I type
>         ^L my xterm screen clears.  I need one of the ⎕AV characters
>         to do what ^L does.   That gives me the absolute basics of
>         screen IO.
>         >
>         > Thanks.
>         >
>         > Blake
>         >
>
>
>
>
>