add unlinkapps for cli access to revert linkapps

lib/cask/cli/unlinkapps.rb

@@ -0,0 +1,12 @@
+class Cask::CLI::Unlinkapps
+  def self.run(*args)
+    casks_to_link = args.empty? ? Cask.installed : args
+    casks_to_link.each do |cask_name|
+      Cask::AppLinker.new(Cask.load(cask_name)).unlink
+    end
+  end
+
+  def self.help
+    "removes symlinks from cask-installed .app files from ~/Applications"
+  end
+end

test/cli/unlinkapps_test.rb

@@ -0,0 +1,24 @@
+require 'test_helper'
+
+describe Cask::CLI::Unlinkapps do
+  before do
+    shutup do
+      # use CLI so both casks start installed and linked
+      Cask::CLI::Install.run('local-caffeine', 'local-transmission')
+    end
+  end
+
+  it "only unlinks casks mentioned when arguments are provided" do
+    Cask::CLI::Unlinkapps.run('local-transmission')
+
+    (Cask.appdir/"Transmission.app").wont_be :symlink?
+    (Cask.appdir/"Caffeine.app").must_be :symlink?
+  end
+
+  it "unlinks all installed casks when no arguments supplied" do
+    Cask::CLI::Unlinkapps.run
+
+    (Cask.appdir/"Transmission.app").wont_be :symlink?
+    (Cask.appdir/"Caffeine.app").wont_be :symlink?
+  end
+end