[R-pkg-devel] Searching examples in source code

[Ben Bolker]

   Whenever you install a package from source you'll see a line at the 
end of the output something like

 > The downloaded source packages are in
	‘/tmp/Rtmp6ZRMH0/downloaded_packages’


That is, the source tarball is downloaded to a *temporary file* (on most 
Linux systems, the /tmp directory is cleared when rebooting).

   You could do something like this (untested!)

i1 <- installed.packages()
for (i in seq(nrow(i1)) {
   m <- i1[i,]
 
download.file(sprintf("https://cran.r-project.org/src/contrib/"%s%s.tar.gz", 
m$Package, m$Version), dest = "tmp.tgz")
   system("tar zxvf tmp.tgz")
}

and then

find . -name "*.c*" -exec grep -iH foo {} \;

or

find . -name "*.R" -exec grep -iH foo {} \;

  would work.


On 2022-05-08 3:02 p.m., Ben Engbers wrote:
> 
> 
> Op 08-05-2022 om 17:55 schreef Iñaki Ucar:
>> On Sat, 7 May 2022 at 23:25, Ben Engbers <Ben.Engbers using be-logical.nl> 
>> wrote:
>>>
>>> Hi,
> 
>>> My first question is if there is a useful linux command to search all
>>> the source code of installed packages on my system.
>>
>> Not sure what you mean here. The source code is not copied along with
>> your installed packages.
> 
> Uh? I didn't know that. How does the compile process work? Does this 
> mean that the (C or C++) sources only live in the repository and that 
> the compile command accesses those files?
> 
>>> The second question is if there is a command to search all packages at
>>> https://cran.r-project.org/web/packages/available_packages_by_name.html?
>>>
>>> This question is not only relevant to C++ examples. It would also be
>>> nice if you could search for occurrences of commands in R code.
>>
>> There's a read-only mirror of CRAN on GitHub
>> (https://github.com/cran). Going there and using the search form
>> (i.e., specifying "org:cran <your_search_here>") is probably the best
>> bet to find what you're looking for.
> 
> If I go to that site and enter "org:cran asio" in  the search field, I 
> am directed to https://github.com/cran/AsioHeaders. That's not what I am 
> looking for; I am looking for C sources which make use of org:cran asio.
> 
> A R-example would be that I was looking for packages which make use of 
> the "socketConnection" function. Entering socketConnection in the search 
> form results in "We couldn’t find any repositories matching 'org:cran 
> socketConnection'". This doesn't help me...
> 
> Ben
>>
>> Iñaki
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-- 
Dr. Benjamin Bolker
Professor, Mathematics & Statistics and Biology, McMaster University
Director, School of Computational Science and Engineering
(Acting) Graduate chair, Mathematics & Statistics