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Posted By

noah on 02/08/10


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html script ruby configuration doc rake install documentation rdoc maintenance automation Gem rubygems Task gems Rakefile


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Howto set up a Rake task to update installed gems and gem sources

 / Published in: Ruby
 

URL: http://rake.rubyforge.org/files/doc/rakefile_rdoc.html

Rails has a task like this, but I couldn't locate it, and it wasn't hard to write my own, and mine worked too :|

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  1. desc 'check for gem dependencies and install any missing gems'
  2.  
  3. task :gems do
  4.   required_gems = %w{
  5.                      cucumber
  6.                      mechanize
  7.                      raakt
  8.                      rspec
  9.                      }
  10.  
  11.   gem_list = %x{gem list}
  12.  
  13.   # check gem sources and only add github if its not already there
  14.   if ((%x{gem sources} =~ %r{http://gems.github.com})).nil?
  15.     puts %x{gem sources -a http://gems.github.com}
  16.   end
  17.  
  18.   required_gems.each do | gem_name |
  19.     if (gem_list=~ %r{#{gem_name}}).nil?
  20.       puts %x{gem install #{gem_name}}
  21.     end
  22.   end
  23. end

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