[bug #61379] [tmac] Detect use of preprocessor "tbl" and "table wider than line"

[G. Branden Robinson]

Update of bug #61379 (project groff):

                 Summary: [*.tmac] Detect use of preprocessor "tbl" and "table
wider than line" => [tmac] Detect use of preprocessor "tbl" and "table wider
than line"

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Follow-up Comment #2:

Some progress.


commit 80ee140eb0616b794b853bbad623263cbea06abc
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Thu Oct 28 15:14:48 2021 +1100

    [man]: Warn if `TE` called but \n[TW] undefined.
    
    [man]: Warn if `TE` table macro but `TW` register (set by tbl(1))
    undefined.  Arrange it so that we warn only once per man(7) document,
    not per table.
    
    * tmac/an.tmac (TH): Remove `TW` register when processing new document
      and clear `an-was-tbl-failure-reported` register.
    
      (TE): Check `TW` and `an-was-tbl-failure-reported` registers; if the
      former is undefined and the latter false, emit the message and set
      `an-was-tbl-failure-reported`.
    
    Addresses part of <https://savannah.gnu.org/bugs/?61379>.  Thanks to
    Bjarni Ingi Gislason for the suggestion.


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