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require 'formula'
require 'keg'
module Homebrew
def switch
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.subdirs.map { |d| Keg.new(d).version }
puts "Versions available: #{versions.join(', ')}"
exit 3
end
# Unlink all existing versions
cellar.subdirs.each do |v|
keg = Keg.new(v)
puts "Cleaning #{keg}"
keg.unlink
end
# Link new version, if not keg-only
if f.keg_only?
keg = Keg.new(cellar+version)
keg.optlink
puts "Opt link created for #{keg}"
else
keg = Keg.new(cellar+version)
puts "#{keg.link} links created for #{keg}"
end
end
end
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