Rakefile for installing leiningen on OSX

Rakefile

require 'rake'

task :default => [:lein]

desc "download leiningen script and create symbolic link to /usr/local/bin/lein"
task :lein do
  leiningen
end

def curl_leiningen(source_file)
  `curl -OL https://github.com/technomancy/leiningen/raw/stable/bin/lein > #{source_file}`
end

def leiningen
  current_dir = File.dirname(__FILE__)
  source_file = File.join(current_dir, 'lein')
  
  curl_leiningen(source_file)
  `chmod +x lein`

  target_file = File.join(File.expand_path('/usr/local/bin/'), 'lein')
  
  `sudo ln -s -Ff #{source_file} #{target_file}`
end

Install

rake

or

rake lein