quick and dirty chef helper for installing packages from CRAN

libraries slash cran_helper.rb

# modified from http://stevendanna.github.io/blog/2011/12/26/snow-and-chef/

module CranHelper
  def self.r_package_is_installed(package_name)
    r_code = "if (any(installed.packages()[,1] == '#{package_name}')) { quit('no', 0, FALSE) }; quit('no', 1, FALSE)"
    "echo \"#{r_code}\" | R --no-save --no-restore -q"
  end

  def self.r_package_install(package_name)
    r_code = "install.packages('#{package_name}')"
    "echo \"#{r_code}\" | R --no-save --no-restore -q"
  end
end

recipes slash cran.rb

execute "install RJSONIO from CRAN" do
  command CranHelper.r_package_install("RJSONIO")
  not_if CranHelper.r_package_is_installed("RJSONIO")
end

recipes slash default.rb

file "/home/ubuntu/.Rprofile" do 
  owner "ubuntu"
  group "ubuntu"
  mode "0644"
  action :create_if_missing
  content 'options("repos"="http://cran.us.r-project.org")'
end