require 'net/http'
require 'yaml'

# install a given gem and version, may also give a URL 
def gem_install(gem, version, url=nil)  
  # only install if not already installed  
  listed = `gem list #{gem} --no-details --local`  
  unless listed =~ %r"^#{gem} "  
    puts "== Installing #{gem}"  
    puts `sudo gem install #{gem} -f -y -v '#{version}'`  
  end  
end  
  
# First try and find a local or given gems.yml file  
gems_config_file = ARGV[0].nil? ? 'gems.yml' : ARGV[0]  
gems = nil  
begin  
  gems = YAML::load_file( gems_config_file )  
rescue Errno::ENOENT => e  
  puts "Could not find file... looking remotely in the wiki Gems.yml"  
  
  url = URI.parse('http://wikiserver/')  
  res = Net::HTTP.start(url.host, url.port) do |http|  
    http.get("/index.php?action=raw&title=Gems.yml")  
  end  
  data = res.body  
  gems = YAML::load(data)  
end  
gems['gems'].each { |gem| gem_install(gem[0], gem[1]) }

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