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From: Xiyue Deng <manphiz@gmail.com>
To: Ihor Radchenko <yantar92@posteo.net>
Cc: emacs-orgmode@gnu.org, Jeremy Sowden <jeremy@azazel.net>
Subject: Re: [BUG] "\fC" macro in ox-man.el [9.6.15 (release_9.6.15 @ /usr/share/emacs/29.2/lisp/org/)]
Date: Mon, 11 Mar 2024 17:06:17 -0700	[thread overview]
Message-ID: <87h6hcia9y.fsf@debian-hx90.lan> (raw)
In-Reply-To: <87frx7moh8.fsf@localhost> (Ihor Radchenko's message of "Sun, 03 Mar 2024 13:30:59 +0000")

Hi Ihor,

Ihor Radchenko <yantar92@posteo.net> writes:

> Xiyue Deng <manphiz@gmail.com> writes:
>
>> (This was first reported to Emacs at
>> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=69483)
>>
>> "mu4e"[1] (a popular Emacs mail client) uses Org to generate its
>> manpages.  However, the generated output contains macros that are not
>> understood by groff.  After some debugging, Jeremy traced this back to
>> the macro "\fC" used in ox-man.el[2].  Git history shows that this may
>> have been there since the beginning.  We tried to find a documentation
>> for the "\fC" macro but has not been able to find one.  Jeremy suggests
>> that "C" may be an old alias for Courier, and if that's the case it
>> should be changed to "\f[CR]".  Would be great if Org people can
>> confirm.
>
> This is not an unknown problem. AFAIU, the \fC macro is widely used for
> troff, although it is not supported by groff. Check out the ongoing
> discussion at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1049968#15
>
> They suggest the following instead of \fC:
>
>    The best solution known to me is to use an extension to the man(7)
>    language.  It first appeared in Ninth Edition Unix (1986) and was
>    adopted by a groff release in 2009.  That is the `EX`/`EE` macro pair,
>    which sets a monospaced display.  (In other words, filling is disabled
>    and a monospaced font selected if necessary.)

I'm not very familiar with roff so my understanding may be off.
According to the `Safe subset' section in man(7), they mentioned the
following:

,----
| Font changes (ft and the \f escape sequence) should only have the
| values 1, 2, 3, 4, R, I, B, P, or CW (the ft command may also have no
| parameters).
`----

Does it mean `\fC' should be replaced by `\f[CW]'?

Also CCing Jeremy who may have a better idea on how this should be
handled.

-- 
Xiyue Deng


  reply	other threads:[~2024-03-12  0:07 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-03-01  7:51 [BUG] "\fC" macro in ox-man.el [9.6.15 (release_9.6.15 @ /usr/share/emacs/29.2/lisp/org/)] Xiyue Deng
2024-03-03 13:30 ` Ihor Radchenko
2024-03-12  0:06   ` Xiyue Deng [this message]
2024-03-13 11:25     ` Ihor Radchenko
2024-03-14 21:46       ` Jeremy Sowden
2024-05-22  9:54         ` Ihor Radchenko

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