nant-to-rake-3.rb

# rakefile.rb with new 'compile' task...

require 'build_tools'

task :compile do
  msbuild :my_sln
end

# build_tools.rb

def msbuild(solution, opts={})
  solution_dir = opts.has_key?(:path) ? opts[:path] : @props[:solution_path]
  solution_path = File.join(solution_dir, "#{solution}.sln")
  sh "#{@props[:tools][:msbuild]} #{solution_path}"
end

# next step? read from yml for easy multiple configs
def setup_defaults
  @props = {}
  @props[:solution_path] = '.\\'
  @props[:tools] = {}
  @props[:tools][:msbuild] = 'C:\\WINDOWS\\Microsoft.NET\\Framework\\v3.5\\MSBuild.exe'
end

setup_defaults