1 files changed, 40 insertions, 0 deletions
diff --git a/Library/Contributions/cmds/brew-switch.rb b/Library/Contributions/cmds/brew-switch.rb
new file mode 100755
index 000000000..3b51f941c
--- /dev/null
+++ b/Library/Contributions/cmds/brew-switch.rb
@@ -0,0 +1,40 @@
+require 'formula'
+require 'keg'
+
+if ARGV.named.length != 2
+  onoe "Usage: brew switch <formula> <version>"
+  exit 1
+end
+
+name = ARGV.shift
+version = ARGV.shift
+
+# Does this formula have any versions?
+f = Formula.factory(name.downcase)
+cellar = f.prefix.parent
+unless cellar.directory?
+  onoe "#{name} not found in the Cellar."
+  exit 2
+end
+
+# Does the target version exist?
+unless (cellar+version).directory?
+  onoe "#{name} does not have a version \"#{version}\" in the Cellar."
+
+  versions = cellar.children.select { |pn| pn.directory? }.collect { |pn| pn.basename.to_s }
+  puts "Versions available: #{versions.join(', ')}"
+
+  exit 3
+end
+
+# Unlink all existing versions
+cellar.children.select { |pn| pn.directory? }.each do |v|
+  keg = Keg.new(v)
+  puts "Cleaning #{keg}"
+  keg.unlink
+end
+
+# Link new version
+
+keg = Keg.new(cellar+version)
+puts "#{keg.link} links created for #{keg}"
+\ No newline at end of file