Re: [Groff] .if !dTS - GNU extension?

[John Gardner]

Oh, erm, whoops. Well in my defence, searching for "d" didn't get me
terribly far, haha. Thanks!

Out of curiosity, would there be any way in classical troff to detect if a
macro is defined? Short of diverting the output of .pm I mean...

On 28 April 2016 at 03:10, Werner LEMBERG <address@hidden> wrote:

>
> > This left me wondering if it's a Groff extension, but I couldn't find any
> > mention of it in *groff_diff*. Or is there something else I'm missing?
>
> Have a look at the `Miscellaneous' section in the `groff_diff' man
> page!  The `!' is a NOT operator (which isn't new), and the GNU troff
> extension `d' is documented there.
>
> The canonical documentation, BTW, are the groff info files, cf.
>
>   http://www.gnu.org/software/groff/manual/
>
>
>     Werner
>