From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <ebe06f630c303e8f0f9e5f176d174f8b@quanstro.net>
From: erik quanstrom <quanstro@quanstro.net>
Date: Tue,  2 Jun 2009 08:02:57 -0400
To: 9fans@9fans.net
In-Reply-To: <0cf63c1e74ede4e317b6a57f40537ea2@comcast.net>
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Subject: Re: [9fans] eqn and unicode
Topicbox-Message-UUID: 02c5d8a4-ead5-11e9-9d60-3106f5b1d025

> Hmm. I submitted a patch so that fonts would apply to resword
> rather than making it so that they don't apply to greek letters,
> and I'm not even sure I did that right.
>
> diff -c /sys/src/cmd/eqn/text.c /usr/gp/sys/src/cmd/eqn/text.c
> /sys/src/cmd/eqn/text.c:83,89 - /usr/gp/sys/src/cmd/eqn/text.c:83,90
>   	else if (t == TAB)
>   		p = "\\t";
>   	else if ((tp = lookup(restbl, p1)) != NULL) {
> - 		p = tp->cval;
> + 		sprintf(cs, "\\f%s%s\\fP", ftp->name, tp->cval);
> + 		p = cs;
>   	} else {
>   		lf = rf = 0;
>   		lastft = 0;
>
> Now I don't know what's right. What if, for example, you
> use "gfont H"? Shouldn't that really make Γ get passed to
> troff as "\fHΓ\fP"?

i'm pretty sure that's wrong for reswords like "≥" or "and".
a font change would also change the appearance of existing
documents.  my change also changes the appearance of
existing documents, but only those that use the relatively-
new unicode input.

on the other hand, for Γ to be treated the same as G,
one would need a new table gktbl() that would be added
here

/sys/src/cmd/eqn/text.c:85,91
	else if ((tp = lookup(restbl, p1)) != NULL) {
		p = tp->cval;
	} else {
+ 		if (tp = lookup(gktbl, p1)) != NULL)
+ 			p = p1 = tp->cval
		lf = rf = 0;
		lastft = 0;
		nclass = NONE;	/* get started with no class == no pad */
		csp = cs;

one would also need to modifiy isalpharune to return
true for greek letters.  or just use the system isalpharune.
i'm sure one could find a number of other bugs.

the reason i didn't suggest this is because it changes old
documents.  perhaps we should just take our lumps and
fix the problem.

- erik