[TUHS] Seeking wisdom from Unix Greybeards
Grant Taylor
cctalk at gtaylor.tnetconsulting.net
Thu Nov 26 14:27:01 CST 2020
On 11/26/20 11:35 AM, Tony Aiuto via cctalk wrote:
> Every time I see discussions about terminal control sequences
> and Unix, I can not help but be reminded of Johnny Zweig's
> eloquent analysis, as quoted in The Unix Haters Handboodk.
> https://web.mit.edu/~simsong/www/ugh.pdf
~chuckle~
I'm going to leave that one alone.
> Forcing programmers to be aware of how their programs talk to terminals
> is medieval, to say the least. Johnny Zweig put it rather bluntly:
I don't know if that's a fair characterization. Especially when my use
case context is either a shell echo or an awk print(f) statement. The
"how do I give the terminal data?" question is relatively easy.
Perhaps the "how" refers more to "what is said" to the terminal. As in
"^[[34m;bob^[[0m;" vs "bob".
Somewhat ironically, it's my caring about doing things properly that has
me asking the question that prompted reference to Unix Haters Handbook.
;-) If I didn't care, I'd just put out the colorized version and be
done with it.
Aside: I wonder how much similarity there is related to controlling old
serial terminals and controlling various web browsers from the
90s-2010s. After all, web browsers are doing (at least) much the same
thing that terminals used to do; displaying data with some amount of
formatting.
Do to time constraints, I opted to just putting the raw ANSI control
codes directly in the functions that do the printing. But I have the
code structured so that I can easily insert a minimal amount of code to
interface with something like tput.
I do like how tput deals with all the smoke and mirrors of what control
sequences need to be used, or not, so that I don't need to.
I do have a real world (at least for me) example of two different
terminals that behave differently. XTerm (et al.) do what I want them
to do. However, the Linux (virtual) console seems to be a subset
thereof. Notably the terminal control sequences meant to set the window
title have an undesired behavior in on the Linux (virtual) console. As
such I do have some code in my profile to account for that when building
PS1. -- Should I need to do that? Probably not. Is it
insurmountable? No. Would it be nicer to integrate something to make
that decision for me? Yes. Would that be a worthwhile dependency? I
doubt it.
--
Grant. . . .
unix || die
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