R help - Aug 2014 - require() but for source()d files

Dear useRs,

I'm looking for something like require() but which will work on 
source()d files.

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.
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-Comt?
Laboratoire Chrono-Environnement
Bureau ATER -107L
16, Route de Gray
25030 Besan?on Cedex, France
ivan.calandra at univ-fcomte.fr
+33 (0) 381 66 20 60
http://chrono-environnement.univ-fcomte.fr/spip.php?article1830

On Aug 21, 2014 7:40 AM, "Ivan Calandra" <ivan.calandra at
univ-fcomte.fr>
wrote:
>
> Dear useRs,
>
> I'm looking for something like require() but which will work on
source()d
files.
>
> 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.

Henrik
> 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-Comt?
> Laboratoire Chrono-Environnement
> Bureau ATER -107L
> 16, Route de Gray
> 25030 Besan?on Cedex, France
> ivan.calandra at univ-fcomte.fr
> +33 (0) 381 66 20 60
> http://chrono-environnement.univ-fcomte.fr/spip.php?article1830
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
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