[bug #53043] [PATCH] an-old.tmac: Check the number of arguments for some macros

[G. Branden Robinson]

Follow-up Comment #8, bug #53043 (project groff):

The CHECKSTYLE register remains undocumented.  See bug #62042 for its possible
future.


commit 25d2a812faf52e4d952769920ccfbe5e61cb1b43
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Sat Nov 14 13:25:26 2020 +1100

    tmac/an-old.tmac: Add style checks.
    
    Add register, CHECKSTYLE, to capture user preference for emission of
    style-related diagnostics.  Defaults off.
    
    Not documented yet because I expect there to be some discussion on the
    mailing list over whether it should be and/or what the register should
    be called.
    
    Whatever emerges from that discussion can and should be parallelized in
    support and form with diagnostics in our mdoc(7) implementation, which
    has some style-oriented diagnostics that issue at the same level as more
    serious problems.
    
    * tmac/an-old.tmac: Initialize CHECKSTYLE to false if not already set.
      (an-style-warn): New macro emits diagnostic of type "style" when
      called if CHECKSTYLE register is true.
      (TH, RI, IR, IB, BI, RB, BR): Call an-style-warn if fewer than two
      arguments are seen.


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