[bug #63158] [ms] consider exposing internal register `nh*hl` as `HL` or similar

[G. Branden Robinson]

URL:
  <https://savannah.gnu.org/bugs/?63158>

                 Summary: [ms] consider exposing internal register `nh*hl` as
`HL` or similar
                 Project: GNU troff
               Submitter: gbranden
               Submitted: Wed 05 Oct 2022 06:31:47 AM UTC
                Category: Macro ms
                Severity: 1 - Wish
              Item Group: Feature change
                  Status: Postponed
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None


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Follow-up Comments:


-------------------------------------------------------
Date: Wed 05 Oct 2022 06:31:47 AM UTC By: G. Branden Robinson <gbranden>
While working on bug #63110 I ran into the following issue.


+.PP
+To get the section number of the numbered headings into the table of
+contents entries,
+we might define
+.CW \%XN\-REPLACEMENT
+as follows.
+.
+(We obtain the heading depth from
+.I "groff ms" 's
+internal register
+.CW nh*hl .)
+.
+.
+.LP
+.TS
+box center;
+L.
+T{
+.nf
+.CW
+\&.XN-INIT
+\&.XH-UPDATE-TOC \[rs]\[rs]n[nh*hl] \[rs]\[rs]$@
+\&\[rs]&\[rs]\[rs]*[SN] \[rs]\[rs]$*
+\&..
+T}
+.TE


The user shouldn't have to grub around with internal registers to extract the
heading depth level.  We should either expose it, or give the new XN/XH
features some way of obtaining it, but the latter might be difficult since we
encourage the user to write replacements for them.

No plans to resolve this for 1.23.







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