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Re: [bug #57592] [PATCH] tmac/<files containing a ".nx" request>: Add a

From: Steffen Nurpmeso
Subject: Re: [bug #57592] [PATCH] tmac/<files containing a ".nx" request>: Add a warning
Date: Mon, 13 Jan 2020 20:23:54 +0100
User-agent: s-nail v14.9.16-67-gc8921880

Bjarni Ingi Gislason wrote in <address@hidden\
 |  <https://savannah.gnu.org/bugs/?57592>
 |From: Bjarni Ingi Gislason <address@hidden>
 |Date: Mon, 13 Jan 2020 18:10:39 +0000
 |To: address@hidden
 |Subject: [PATCH] tmac/<files containing a ".nx" request>: Add a warning
 |  Some macro files have an '.nx' request
 |to avoid to have all of it read a second time.
 |  Add a warning to point out this unwanted situation.

I do not think this is a good idea in general, since this means
you cannot blindly include some file to ensure it is present or
not.  Say you want to include some picture in a report and include
the macro set which allows that, but it was already sourced (maybe
due to some condition) in another macro set.  Now you have
a pointless warning.

The way it is done right now is how most languages ensure that
files get included once only, may it be C headers or even TeX:

  \csname xy_IS_LOADED\endcsname

 |  Two files, "pdfpic.tmac" and "pspic.tmac",
 |are automatically read,
 |as they are used in the file "tmac/troffrc".

And that users can adjust the way they want, no?

|Der Kragenbaer,                The moon bear,
|der holt sich munter           he cheerfully and one by one
|einen nach dem anderen runter  wa.ks himself off
|(By Robert Gernhardt)

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