[bug #59973] [PATCH] implement .soquiet and .msoquiet requests

[G. Branden Robinson]

URL:
  <https://savannah.gnu.org/bugs/?59973>

                 Summary: [PATCH] implement .soquiet and .msoquiet requests
                 Project: GNU troff
            Submitted by: gbranden
            Submitted on: Sat 30 Jan 2021 06:42:25 AM UTC
                Category: Core
                Severity: 1 - Wish
              Item Group: New feature
                  Status: In Progress
                 Privacy: Public
             Assigned to: gbranden
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None

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Details:

Use case #1: The internationalization patch in bug #59814 could use this to
_quietly_ attempt to open a localization file.  groff only supports a few
locales, so people with LANG=es_ES, for instance would ordinarily see warning
diagnostics on every groff startup if file warnings are enabled.

Use case #2: Support of user-specific troffrc or man.local files, gracefully
failing if they don't exist or if there is a permissions problem.  Imagine:


.soquiet \v[XDG_DATA_HOME]/man.local


Yes, .msoquiet could be aped with *roff arithmetic to effectively mask off the
warning type and then restoring it.  This is incredibly tedious.  It is also
fragile, being subject to breakage if a new warning category is ever added;
see bug #52990.

Attaching straw-man implementation.  Includes test, does not yet include
updates to documentation.

The `while (1)` may look weird.  I judged it better than complicating the
boolean conditional afterward (indeed, I managed to mess it up when I tried),
and it avoids using goto.  In my opinion it's easier to understand than
golfier alternatives I can imagine.






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File Attachments:


-------------------------------------------------------
Date: Sat 30 Jan 2021 06:42:25 AM UTC  Name: soquiet.diff  Size: 6KiB   By:
gbranden

<http://savannah.gnu.org/bugs/download.php?file_id=50807>

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