Use many directories to build R packages.

This allows using many folders to write R packages, letting you structure the project more or less how you but benefiting from the R toolchain around R packages (testing, documentation, etc.).

The function bundle looks for .R files in the srcpkg and simply copies them to the /R directory whilst tracking changes in the .many file. If that process fails you can run reset to clear that file the subsequent bundle run will force copy all files.

• The srcpkg can contain multiple nested directories, for an example look at the source code of this package. Everything else remains the same, e.g.: use of inst, etc.
• Set the MANY_VERBOSE environment variable to FALSE if you want to switch off all messages.
• Run tidy() to clean up old files but you should not have to do this, it's handled in bundle().
• If you run into any issue you can always reset the tracking by running many::reset() (you will NOT lose any progress).

To our knowledghe, rfold is the only other package, hosted on CRAN, that proposed the idea of using multiple directories to build R packages, but with a different code implementation.