'brew fetch' now an official command

Library/Contributions/examples/brew-fetch.rb

-# Downloads the tarballs for the given formulae to the Cache
-
-require 'formula'
-require 'fileutils'
-
-ARGV.formulae.each do |f|
-  if ARGV.include? "--force" or ARGV.include? "-f"
-    where_to = `brew --cache #{f.name}`.strip
-    FileUtils.rm_rf where_to unless where_to.empty?
-  end
-
-  the_tarball = f.downloader.fetch
-  next unless the_tarball.kind_of? Pathname
-
-  previous_md5 = f.instance_variable_get(:@md5)
-  previous_sha1 = f.instance_variable_get(:@sha1)
-
-  puts "MD5:  #{the_tarball.md5}"
-  puts "SHA1: #{the_tarball.sha1}"
-
-  unless previous_md5.nil? or the_tarball.md5 == previous_md5
-    opoo "Formula reports different MD5: #{previous_md5}"
-  end
-  unless previous_sha1.nil? or the_tarball.sha1 == previous_sha1
-    opoo "Formula reports different SHA1: #{previous_sha1}"
-  end
-end

Library/Homebrew/cmd/fetch.rb

+require 'formula'
+
+# Downloads the tarballs for the given formulae to the Cache
+
+module Homebrew extend self
+  def fetch
+    ARGV.formulae.each do |f|
+      if ARGV.include? "--force" or ARGV.include? "-f"
+        where_to = `brew --cache #{f.name}`.strip
+        FileUtils.rm_rf where_to unless where_to.empty?
+      end
+
+      the_tarball = f.downloader.fetch
+      next unless the_tarball.kind_of? Pathname
+
+      previous_md5 = f.instance_variable_get(:@md5)
+      previous_sha1 = f.instance_variable_get(:@sha1)
+
+      puts "MD5:  #{the_tarball.md5}"
+      puts "SHA1: #{the_tarball.sha1}"
+
+      unless previous_md5.nil? or previous_md5.empty? or  the_tarball.md5 == previous_md5
+        opoo "Formula reports different MD5: #{previous_md5}"
+      end
+      unless previous_sha1.nil? or previous_sha1.empty? or the_tarball.sha1 == previous_sha1
+        opoo "Formula reports different SHA1: #{previous_sha1}"
+      end
+    end
+  end
+end