Re: Including command output

[Aditya Mahajan <adityam@umich.edu>]

On Sun, 4 Mar 2012, Kip Warner wrote:

> Hey list,
>
> I'd like to include the output of a command. I am using the following to
> define the command,
>
> \def\BazaarRevision{\cldcontext{os.resultof"bzr revno | tr -d '\\n'"}}
>
> and the following to use the output of the command,
>
> \BazaarRevision
>
> A concern I have is whether this command is executed multiple times
> during the typesetting process when it need only be done once with the
> result cached. If this is indeed the case,

Yes.

> does anyone have any suggestions?

The cleaner way is to seperate the setup and use. For example:

\def\initilizebazaar
     {\ctxlua{context.setevalue(
               "usebazaarrevision",
                os.resultof"bzr revno | tr -d '\\n'")}}

\appendtoks \initilizebazaar \to \everystarttext

and then use can use \usebazaarrevision in the main text.

If you want to use the automagic way, you can define \BazaarRevision to 
redefined \BazaarRevision, for example:

\def\BazaarRevision
       {\ctxlua{context.setevalue(
                 "BazaarRevision",
                  os.resultof"bzr revno | tr -d '\\n'")}%
        \BazaarRevision}


Aditya

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