2014-11-18_install-github-tmp-lib.r

library("devtools") # with_lib(), install_github()

tmp_lib <- file.path(tempdir(), ".lib")
dir.create(tmp_lib)

cran_pkg <- function(pkg, tmp_lib = tmp_lib){
  ## upgrade or downgrade a package here
  ## following example is upgrading to bleeding edge devel version
  with_lib(tmp_lib, install.packages(pkg, repos = "http://cran.rstudio.com"))
  ## but this could also be a downgrade to the CRAN/released version!
}

dev_pkg <- function(pkg, tmp_lib = tmp_lib){
  ## upgrade or downgrade a package here
  ## following example is upgrading to bleeding edge devel version
  with_lib(tmp_lib, install_github(pkg))
  ## but this could also be a downgrade to the CRAN/released version!
}

load_tmp <- function(pkg, tmp_lib = tmp_lib){
  ## explicitly load the affected packages from the temporary library
  library(pkg, lib.loc = tmp_lib, character.only = TRUE)
}

## By using tmpdir, the library will be clobbered automatically when you leave R.