Changing stream font with DSPFONT

[pamoroso]

I'm trying to change the font of a stream with DSPFONT and code like:

← (DSPFONT '(CLASSIC 24) T)
← (PRINT "Still gacha?")

but the change doesn't doesn't take place:

Why? Does the T stream work differently?

[nbriggs]

The execs manage their fonts, see IRM section 13-EXECUTIVE, "Fonts in the Exec" - the variables PROMPTFONT, INPUTFONT, PRINTOUTFONT etc. so changing the display font for one of their streams will immediately get overridden. You can set those variables.

[nbriggs]

It's good to read the IRM - even after all this time I occasionally find things I didn't know.
See pages 13-20 ff. of https://interlisp.org/documentation/IRM.pdf for the full list of cursor movement and input editing commands that the exec processes.

[rmkaplan]

An event can manage its own fonts, but the Exec takes over again when an event is complete. So to test fonts in the exec, you have to do it within an event: (PROGN (DSPFONT xx T) yyy)

…

On Jan 21, 2025, at 8:54 AM, Nick Briggs ***@***.***> wrote: The execs manage their fonts, see IRM section 13-EXECUTIVE, "Fonts in the Exec" - the variables PROMPTFONT, INPUTFONT, PRINTOUTFONT etc. so changing the display font for one of their streams will immediately get overridden. You can set those variables. — Reply to this email directly, view it on GitHub <#1983 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AQSTUJNCSDIAVIERO445K4T2LZ3TJAVCNFSM6AAAAABVS2XCA2VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTCOJQGUYTENA>. You are receiving this because you are subscribed to this thread.

[pamoroso]

Is there a way of telling an Exec stream from other streams so that I can call DSPFONT or set PRINTOUTFONT as appropriate?

[pamoroso]

A predicate for a TTY display stream may be simply (EQ STREAM T).

[nbriggs]

Did you read Ron's answer just prior to your question? It would be wrong to write code that made that check and changed the PRINTOUTFONT based on it.