Simple script to generate `PKGBUILD` for building R pkgs in ArchLinux

## Usage

Run `python generate_pkgbuild_for_r.py --help` for detail.

## Features

* support for R packages from [CRAN](https://cran.r-project.org)
* support for R packages from [Bioconductor](https://bioconductor.org)
* recursively generate `PKGBUILD` for R packages and its depends
* add `gcc-fortran` to `makedepends` if any Fortran source file is found in source tarball 
* generate `lilac.yaml` and `lilac.py` for building in [ArchLinux CN repo](https://github.com/archlinuxcn/repo)
* and more...