On 9 October 2015 at 08:06, Eli Zaretskii <[email protected]> wrote:
> So perhaps we should introduce a facility for such tests, and
> preferably in a way that is itself backward-compatible, e.g., testable
> with @ifset or some such.
It already exists. See (texinfo)Testing for Texinfo Commands:
============
These command-checking conditionals themselves were added in
Texinfo 5.0, released in 2013--decades after Texinfo's inception. In
order to test if they themselves are available, the predefined flag
'txicommandconditionals' can be tested, like this:
@ifset txicommandconditionals
@ifcommandnotdefined foobarnode
(Good, '@foobarnode' is not defined.)
@end ifcommandnotdefined
@end ifset
Since flags (see the previous section) were added early in the
existence of Texinfo, there is no problem with assuming they are
available.
==============
