[bug #66054] [troff] permit special characters as source hyphenation codes

[G. Branden Robinson]

Follow-up Comment #12, bug #66054 (group groff):

[comment #11 comment #11:]
> [comment #9 comment #9:]
> > Running with _groff_ 1.23 adds a different confounding factor.
> 
> I'm not sure how your first output of the word got hyphenated under 1.23...

It wasn't. I rewound the source tree to right before the commit documented in
comment #1.
 
> > Specifically this:
> > 
> > commit f66f771c22690f5f0e6dec3c9a53adb7243bb7fe
> > Author: G. Branden Robinson <g.branden.robinson@gmail.com>
> > Date:   Thu Aug 1 18:16:19 2024 -0500
> 
> ...but I am sure this commit from a year after 1.23's release can't be any
kind of factor in a 1.23 installation.

The point I was trying to make is that more than one thing (moving `hcode`
invocations from one macro file to another) has changed, and that one seemed
squarely on point.

> The point of using 1.23 rather than anything more recent was to show the
sequence:
> 0 The first output of the word, before the document does any .hcode
fiddling, has no break points.
> 0 After telling groff to treat é like e, the word gets broken.
> 0 After attempting to "undo" this mapping using .tr-like syntax, the word
still breaks as it did after the first .hcode, not as it did before it.

I don't know what I'm supposed to do about this.  In _groff_ 1.23.0 you
couldn't unset a character's hyphenation code, as far as I know.  You could
change it to some other nonzero value, but not ever put it back to zero.


$ iconv -f latin1 EXPERIMENTS/resume-dave-latin-1-gbr.groff
.ll 1n
r\['e]sum\['e]
.hcode é e       \" sets up a mapping
r\['e]sum\['e]
.hcode é é       \" undoes that mapping, maybe?
r\['e]sum\['e]   \" ... what happens now?
.hcode é $       \" also undoes that mapping
r\['e]sum\['e]   \" ... but only in Git HEAD
$ ~/groff-stable/bin/groff -W break -T utf8
EXPERIMENTS/resume-dave-latin-1-gbr.groff | cat -s
résumé
ré‐
sumé
ré‐
sumé
ré‐
sumé

$ ~/groff-HEAD/bin/groff -W break -T utf8
EXPERIMENTS/resume-dave-latin-1-gbr.groff | cat -s
ré‐
sumé
ré‐
sumé
ré‐
sumé
résumé



Oh, I see.  I thought the 3rd résumé wouldn't hyphenate, but it did.

Huh.


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