Date: Fri, 23 Jun 2023 03:17:26 +0200 (CEST)
From: Erik Wienhold <ewie@ewie.name>
To: Bruce Momjian <bruce@momjian.us>, Kirk Parker <khp@equatoria.us>
Cc: pbaumard@gmail.com, pgsql-docs@lists.postgresql.org
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In-Reply-To: <ZJS2gHelFEZ242BC@momjian.us>
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Subject: Re: Change "two" to "three" for decades of development in history
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> On 22/06/2023 23:00 CEST Bruce Momjian <bruce@momjian.us> wrote:
>
> On Thu, Jun 22, 2023 at 01:47:16PM -0700, Kirk Parker wrote:
> >
> > I don't suppose DocBook has macro and system-variable capabilities? That
> > could provide a set-and-forget solution to this?
>
> Uh, I am not aware of any.

An SGML entity [0] or an xsltproc stringparam [1] looks viable.  Question is
how to calculate the number of decades in the Makefile.  It's trivial in SQL :)

	=# select extract(decade from now()) - extract(decade from date '1986-01-01');
	 ?column?
	----------
	        4
	(1 row)
	
	=# select extract(day from now() - date '1986-01-01') / 365.25 / 10;
	      ?column?
	--------------------
	 3.7472963723477071
	(1 row)

[0] https://git.postgresql.org/gitweb/?p=postgresql.git;a=blob;f=doc/src/sgml/Makefile;h=71cbef230f34a6ad6b41a667c7d2977fb6560378;hb=HEAD#l98
[1] https://git.postgresql.org/gitweb/?p=postgresql.git;a=blob;f=doc/src/sgml/Makefile;h=71cbef230f34a6ad6b41a667c7d2977fb6560378;hb=HEAD#l56

--
Erik