[R] require() but for source()d files

Henrik Bengtsson hb at biostat.ucsf.edu
Thu Aug 21 18:15:50 CEST 2014

On Aug 21, 2014 7:40 AM, "Ivan Calandra" <ivan.calandra at univ-fcomte.fr>
> Dear useRs,
> I'm looking for something like require() but which will work on source()d
> I have a .R file with lots of functions and I'm writing a new function
(say, 'foo') that depends on the functions from this file.
> Until now, I have always source()d the .R file before running 'foo'.
> But I would like to include some code in 'foo' to source() the file only
if it hasn't been done yet, and do nothing if the file has already been
source()d in the session.

R.utils::sourceTo(file, modifiedOnly=TRUE)

should do it. It will always source the file once. Also, contrary to
source() it default is to use local=TRUE.


> So, the same behavior as require() with packages, but with a .R file.
> Does it make sense? I could provide an example if you think it would help.
> Thank you in advance,
> Ivan
> --
> Ivan Calandra
> University of Franche-Comté
> Laboratoire Chrono-Environnement
> Bureau ATER -107L
> 16, Route de Gray
> 25030 Besançon Cedex, France
> ivan.calandra at univ-fcomte.fr
> +33 (0) 381 66 20 60
> http://chrono-environnement.univ-fcomte.fr/spip.php?article1830
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