add cask reinstall command

Library/Homebrew/cask/lib/hbc/cli.rb

@@ -15,6 +15,7 @@ require "hbc/cli/home"
 require "hbc/cli/info"
 require "hbc/cli/install"
 require "hbc/cli/list"
+require "hbc/cli/reinstall"
 require "hbc/cli/search"
 require "hbc/cli/style"
 require "hbc/cli/uninstall"

Library/Homebrew/cask/lib/hbc/cli/reinstall.rb

@@ -0,0 +1,48 @@
+module Hbc
+  class CLI
+    class Reinstall < Install
+      def self.install_casks(cask_tokens, force, skip_cask_deps, require_sha)
+        count = 0
+        cask_tokens.each do |cask_token|
+          begin
+            cask = Hbc.load(cask_token)
+
+            if cask.installed?
+              # use copy of cask for uninstallation to avoid 'No such file or directory' bug
+              installed_cask = cask;
+              latest_installed_version = installed_cask.timestamped_versions.last
+
+              unless latest_installed_version.nil?
+                latest_installed_cask_file = installed_cask.metadata_master_container_path
+                                                 .join(latest_installed_version.join(File::Separator),
+                                                 "Casks", "#{cask_token}.rb")
+
+                # use the same cask file that was used for installation, if possible
+                installed_cask = Hbc.load(latest_installed_cask_file) if latest_installed_cask_file.exist?
+              end
+
+              # Always force uninstallation, ignore method parameter
+              Installer.new(installed_cask, force: true).uninstall
+            end
+
+            Installer.new(cask,
+                          force:          force,
+                          skip_cask_deps: skip_cask_deps,
+                          require_sha:    require_sha).install
+            count += 1
+          rescue CaskUnavailableError => e
+            warn_unavailable_with_suggestion cask_token, e
+          rescue CaskNoShasumError => e
+            opoo e.message
+            count += 1
+          end
+        end
+        count.zero? ? nil : count == cask_tokens.length
+      end
+
+      def self.help
+        "reinstalls the given Cask"
+      end
+    end
+  end
+end

Library/Homebrew/cask/test/cask/cli/reinstall_test.rb

@@ -0,0 +1,17 @@
+require "test_helper"
+
+describe Hbc::CLI::Reinstall do
+  it "allows reinstalling a Cask" do
+    Hbc::CLI::Install.run("local-transmission")
+    Hbc.load("local-transmission").must_be :installed?
+    Hbc::CLI::Reinstall.run("local-transmission")
+    Hbc.load("local-transmission").must_be :installed?
+  end
+
+  it "allows reinstalling a non installed Cask" do
+    Hbc::CLI::Uninstall.run("local-transmission")
+    Hbc.load("local-transmission").wont_be :installed?
+    Hbc::CLI::Reinstall.run("local-transmission")
+    Hbc.load("local-transmission").must_be :installed?
+  end
+end