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Simple Rake task to use sed to strip trailing whitespace from Ruby source

View rake_strip_whitespace.rb
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desc "Remove trailing whitespace for source files"
task :strip_whitespace do
files = %w[ .autotest .rspec .rvmrc Gemfile ]
globs = %w[ lib/**/*.rb spec/**/*.rb ]
files_from_globs = { |glob| Dir[glob] }
files_to_strip = (files + files_from_globs).flatten
system "sed -e 's/[ \t]*$//' -i '' #{files_to_strip.join(" ")}"
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