[R-pkg-devel] Is it possible to reverse engineer a package from the installed library directory ?

[Georgi Boshnakov]

Further to Joshua's comment, 
package "Rdpack" has a function reprompt(), which when called with one argument 
creates an Rd documentation file. It can do this for methods (S3/S4), classes and package-package if required,
e.g.

library(Rdpack)
reprompt(lm)

creates a lm.Rd in the current working directory.

reprompt() actually checks if the current documentation is up to date and updates the usage statement or adds the  items for additional arguments as needed. I use it during development.

Georgi

-----Original Message-----
From: R-package-devel [mailto:r-package-devel-bounces at r-project.org] On Behalf Of Joshua Ulrich
Sent: 24 March 2016 05:53
To: Ben Bolker
Cc: r-package-devel at r-project.org
Subject: Re: [R-pkg-devel] Is it possible to reverse engineer a package from the installed library directory ?

On Wed, Mar 23, 2016 at 9:25 PM, Ben Bolker <bbolker at gmail.com> wrote:
>
>  You could take your old install and do this:
>
>   library("your_package")
>   funs <- ls(pos="package:your_package")
>   dump(funs,"your_package.R")
>
>   that wouldn't recreate documentation, NAMESPACE files, etc., but it 
> would be a start.
>
You might be able to recreate the Rd files using the answers to this StackOverflow question: http://stackoverflow.com/q/7493843/271616

Using the example in my answer as a starting point:
sink(file="survey.Rd")
utils:::.getHelpFile(as.character(help(survey,package="MASS")))
sink()

It might still need some formatting clean-up, but hopefully that gets you 80-90% of the solution.

>
> On 16-03-23 04:43 PM, Paul Hurley wrote:
>>
>> Several years ago I assembled some of my own most used code into a 
>> package, and had that installed on my machine.  Since then I have 
>> lost the source files, but still have the package installed in an old 
>> v2.x R installation.
>>
>> I now need to use the package in my current R install, which is v3.1, 
>> and won't let me just copy the directory across, as it complains it 
>> was build pre v3.  Is it possible to reverse engineer a package back 
>> to R source files so I can then rebuild it in a new package ?
>>
>> Thanks
>>
>> Paul.
>>
>> --http://www.paulhurley.co.uk
>>
>>         [[alternative HTML version deleted]]
>>
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>
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--
Joshua Ulrich  |  about.me/joshuaulrich
FOSS Trading  |  www.fosstrading.com
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