[bug #58946] [ms] adapt to use the facilities of pdfmark

[Keith Marshall]

Follow-up Comment #13, bug #58946 (project groff):

Arrrrgh!!!  Why can't savannah offer a sane UI, like OSDN?  Please ignore
[comment #12 prematurely submitted comment #12], (which I seem to be unable to
either edit, or delete)!

Here's what I wanted it to say:
[comment #11 comment #11:]
> > I'm wondering if there may be some justification for incorporation of
> > simplified versions of [XH and XN], and maybe also a minimal default
> > implementation of "XH-UPDATE-TOC", within s.tmac?
> > 
> > What do you think?
> 
> I think "yes"!  Please go for it.  ...
I've attached two proposed patches; [file #52067 patch #52067] adds minimal
implementations of XH and XN, (together with default implementations of
ancillary hooks XH-INIT, XN-INIT, XH-UPDATE-TOC, XH-REPLACEMENT, and
XN-REPLACEMENT), to s.tmac, while [file #52069 patch #52069] removes the
default XH-INIT, XN-INIT, and XH-UPDATE-TOC implementations from spdf.tmac,
(adopting those from s.tmac), and reimplements XH, and XN *indirectly*, in
spdf.tmac, using XH-REPLACEMENT and XN-REPLACEMENT respectively, rather than
redefining XH and XN directly.

In s.tmac, I've preserved the same calling syntax for XH, XN, and
XH-UPDATE-TOC, as I originally specified in spdf.tmac, (and as outlined in
comment #10), *except* that the -N, -S, and -X options are unsupported, for XH
and XN; I have retained <outline-level> as a mandatory argument to
XH-UPDATE-TOC, (even though the default implementation in s.tmac ignores it),
since it is an essential component of the interface design.

I did agonize, for some time, over the default implementation of XH,
(specifically, how it should be protected against use before SH); I eventually
decided that, unlike the misuse of XN before NH, no such protection is
actually necessary.

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