What might be wrong with the following code below as it doesn't clear the screen and print "(0, 0)" as expected:

import arsd.terminal;

void main() {
  auto term = Terminal(ConsoleOutputType.cellular);
  term.clear;
  term.writefln("(%s, %s)", term.cursorX, term.cursorY);
}

If I change to the ConsoleOutputType.linear then the screen is cleared and "(0, 0)" is printed as expected.

I'm running Gnome Terminal in Red Hat Linux and compiling with DMD:

[jani@red arsd]$ echo $TERM
xterm-256color
[jani@red arsd]$ cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.6 (Maipo)
[jani@red arsd]$ dmd --version
DMD64 D Compiler v2.083.0
Copyright (C) 1999-2018 by The D Language Foundation, All Rights Reserved written by Walter Bright
[jani@red arsd]$

On Saturday, 13 July 2019 at 13:30:47 UTC, Jani Hur wrote:
> void main() {
>   auto term = Terminal(ConsoleOutputType.cellular);
>   term.clear;
>   term.writefln("(%s, %s)", term.cursorX, term.cursorY);
> }

In cellular mode, it switches the terminal to an alternate screen (like vim - notice that when you exit vim, it goes back to the same screen view you had when you went into it, instead of being leftover stuff from the full screen application), and terminal's destructor switches back.

So what happened here is:

1) it switched to the alternate screen.
2) cleared and printed text to that
3) switched back to the normal screen at program exit


Meaning you don't see the output!

Simply add some kind of wait to the end of main() so the program doesn't exit.

Like

term.getline();

right at teh end so it waits for you to press enter before exiting and you should see it.

Other arsd.terminal related question. How to clear a line when it is re-used ? The following code snipped is expected to print:

important text !

but instead it prints:

important text !gless mambo-jambo (33, 0)

import arsd.terminal;

void main() {
  auto term = Terminal(ConsoleOutputType.linear);
  term.clear;
  term.write("plenty of meaningless mambo-jambo");
  term.writef(" (%s, %s)", term.cursorX, term.cursorY);
  term.moveTo(0, 0);
  term.write("important text !");
  term.writeln;
}

On Saturday, 13 July 2019 at 13:41:41 UTC, Jani Hur wrote:
> Other arsd.terminal related question. How to clear a line when it is re-used ?

You need to print a number of spaces at the end to clear what's after it. Maybe like a loop from string.length .. terminal.width -1 and write(" ").

(maybe i should add a function for that)

Thanks for the answers Adam - I can now proceed !

On Saturday, 13 July 2019 at 14:08:26 UTC, Jani Hur wrote:
> Thanks for the answers Adam - I can now proceed !

I wrote two simple examples for D dummies (like me and myself) to demonstrate arsd.terminal features I'm planning to use in my "real" console "application". The examples are available in:

https://bitbucket.org/janihur/d-ex/src/master/arsd/