[bug #66640] [man] stops rendering document on encountering argumentless `SH` call

[G. Branden Robinson]

URL:
  <https://savannah.gnu.org/bugs/?66640>

                 Summary: [man] stops rendering document on encountering
argumentless `SH` call
                   Group: GNU roff
               Submitter: gbranden
               Submitted: Sun 05 Jan 2025 09:32:37 AM UTC
                Category: Macro package man
                Severity: 3 - Normal
              Item Group: Incorrect behaviour
                  Status: In Progress
                 Privacy: Public
             Assigned to: gbranden
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None


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Follow-up Comments:


-------------------------------------------------------
Date: Sun 05 Jan 2025 09:32:37 AM UTC By: G. Branden Robinson <gbranden>
This affects Git HEAD, not any released version of _groff_.


$ ~/groff-HEAD/bin/nroff -man <<EOF
 .TH foo 1 2025-01-04 "groff test suite"
.SH Name
foo \- frobnicate a bar
.SH
Description
With any luck,
this text is visible.
EOF
foo(1)                       General Commands Manual
foo(1)

Name
     foo - frobnicate a bar


groff test suite                   2025‐01‐04
foo(1)

Not only is text missing, but the right-hand footer gets rendered in the wrong
typeface because enough of `SH` was processed to remap the `B` font to `BI`.

The problem is a missing `\}`.  Fix pending.

At least I can say I've finally, after ~7-8 years of contributing to _groff_,
seen a man page in the wild that consciously exercises `SH`'s input trap--it's
GNU _dc_(1).

`SS` does not suffer the defect.  But I'm adding a regression test for it
anyway.







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