Re: [Bug-apl] How to set the screen width in APL interpreter

[Juergen Sauermann]

Hi Alexey,

I do not think this is a good idea.

I believe many people will be surprised if ⎕PW is different from 80.
And GNU APL does not necessarily run in a terminal. In my experience,
the terminal width is a fairly unreliable parameter on many platforms, and
adjusting ⎕PW automatically is asking for trouble.

So for the sake of compatibility and the principle of least surprises, I leave ⎕PW at 80.

Please not also that negative ⎕FIO arguments are not protable and not
available on all platforms (that's why they are not documented).

Most people do not put things in ⎕LX directly but have some larger APL function that
is called from ⎕LX. So an extra line in that function which sets ⎕PW is probably the
better solution.

/// Jürgen

On 12/24/2016 10:13 AM, Alexey Veretennikov wrote:

Thanks! Both versions works for me on OSX, however on my small linux box tput
is not available while ⎕FIO¯8 works fine.

Jurgen, maybe it could be added as a default configuration for GNU APL
interpreter? From usability point it rather confusing to set this
variable manually (right now I did it in ⎕LX in CONTINUE workspace)

Christian Robert <address@hidden> writes:

      ⎕fio ¯8
200

undocumented ⎕fio ¯8 give you the window width,

Xtian.


On 2016-12-23 19:43, Kacper Gutowski wrote:

On Sat, Dec 24, 2016 at 12:14:41AM +0100, Alexey Veretennikov wrote:

I'm running GNU APL in the X terminal with geometry 48x15 (it is a small
screen). How could I set this width(48) to the GNU APL interpreter so it
will behave correctly on deletion of characters in long lines etc?

Setting print width affects line editing as well.  It should wrap
correctly if you set ⎕PW to the width of your terminal.

      ⎕PW←⍎↑⍎')HOST tput cols'

Sometimes I wish GNU APL did this automatically on WINCH.

-k