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#: * `switch` <name> <version>:
#: Symlink all of the specific <version> of <name>'s install to Homebrew prefix.
require "formula"
require "keg"
require "cmd/link"
module Homebrew
module_function
def switch
if ARGV.named.length != 2
onoe "Usage: brew switch <name> <version>"
exit 1
end
name = ARGV.shift
version = ARGV.shift
rack = Formulary.to_rack(name)
unless rack.directory?
onoe "#{name} not found in the Cellar."
exit 2
end
# Does the target version exist?
unless (rack/version).directory?
onoe "#{name} does not have a version \"#{version}\" in the Cellar."
versions = rack.subdirs.map { |d| Keg.new(d).version }
puts "Versions available: #{versions.join(", ")}"
exit 3
end
# Unlink all existing versions
rack.subdirs.each do |v|
keg = Keg.new(v)
puts "Cleaning #{keg}"
keg.unlink
end
keg = Keg.new(rack/version)
# Link new version, if not keg-only
if keg_only?(rack)
keg.optlink
puts "Opt link created for #{keg}"
else
puts "#{keg.link} links created for #{keg}"
end
end
end
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