From 18cd7b7b4be8c2b99bc5185e37028c57647756f0 Mon Sep 17 00:00:00 2001
From: commitay <commitay@users.noreply.github.com>
Date: Sat, 28 Apr 2018 20:12:55 +1000
Subject: [PATCH] zap: CaskNotInstalledError

---
 Library/Homebrew/cask/lib/hbc/cli/zap.rb | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Library/Homebrew/cask/lib/hbc/cli/zap.rb b/Library/Homebrew/cask/lib/hbc/cli/zap.rb
index 7f5e6785dc..7148bdf10c 100644
--- a/Library/Homebrew/cask/lib/hbc/cli/zap.rb
+++ b/Library/Homebrew/cask/lib/hbc/cli/zap.rb
@@ -11,6 +11,9 @@ module Hbc
       def run
         casks.each do |cask|
           odebug "Zapping Cask #{cask}"
+
+          raise CaskNotInstalledError, cask unless cask.installed? || force?
+
           Installer.new(cask, verbose: verbose?, force: force?).zap
         end
       end