require() but for source()d files

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

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

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 
<mailto: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 <mailto:ivan.calandra at univ-fcomte.fr>
+33 (0) 381 66 20 60
http://chrono-environnement.univ-fcomte.fr/spip.php?article1830