From 50a43cf6780cc5380bb00d192296d91ebb3cddc9 Mon Sep 17 00:00:00 2001
From: Markus Reiter <me@reitermark.us>
Date: Fri, 25 May 2018 22:47:31 +0200
Subject: [PATCH 1/3] Reset `repo_var` in `clear_cache`.

---
 Library/Homebrew/compat/tap.rb | 3 +--
 Library/Homebrew/tap.rb        | 1 +
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Library/Homebrew/compat/tap.rb b/Library/Homebrew/compat/tap.rb
index 1fd53058a5..df720e35eb 100644
--- a/Library/Homebrew/compat/tap.rb
+++ b/Library/Homebrew/compat/tap.rb
@@ -15,10 +15,9 @@ class Tap
       old_path = path
       old_remote = path.git_origin
 
+      clear_cache
       super(new_user, new_repo)
 
-      @repo_var = nil
-
       new_initial_revision_var = "HOMEBREW_UPDATE_BEFORE#{repo_var}"
       new_current_revision_var = "HOMEBREW_UPDATE_AFTER#{repo_var}"
 
diff --git a/Library/Homebrew/tap.rb b/Library/Homebrew/tap.rb
index eec9c175ab..fa167c5a89 100644
--- a/Library/Homebrew/tap.rb
+++ b/Library/Homebrew/tap.rb
@@ -84,6 +84,7 @@ class Tap
   # clear internal cache
   def clear_cache
     @remote = nil
+    @repo_var = nil
     @formula_dir = nil
     @cask_dir = nil
     @formula_files = nil

From d1fb1d2abc9eeffde4f2318f09d72978dd68949b Mon Sep 17 00:00:00 2001
From: Markus Reiter <me@reitermark.us>
Date: Fri, 25 May 2018 22:47:41 +0200
Subject: [PATCH 2/3] Use simpler check.

---
 Library/Homebrew/cmd/search.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Library/Homebrew/cmd/search.rb b/Library/Homebrew/cmd/search.rb
index faf9557e76..a9afe5ad7d 100644
--- a/Library/Homebrew/cmd/search.rb
+++ b/Library/Homebrew/cmd/search.rb
@@ -122,7 +122,7 @@ module Homebrew
     matches.map do |match|
       filename = File.basename(match["path"], ".rb")
       tap = Tap.fetch(match["repository"]["full_name"])
-      next if tap.installed? && !(tap.user == "Homebrew" && tap.repo.start_with?("cask"))
+      next if tap.installed? && !tap.name.start_with?("homebrew/cask")
       "#{tap.name}/#{filename}"
     end.compact
   end

From df2a40d20794ac2cb377479451acaf89ca2f6d17 Mon Sep 17 00:00:00 2001
From: Markus Reiter <me@reitermark.us>
Date: Fri, 25 May 2018 22:54:34 +0200
Subject: [PATCH 3/3] Use `remote` instead of `path.git_origin`.

---
 Library/Homebrew/compat/tap.rb | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Library/Homebrew/compat/tap.rb b/Library/Homebrew/compat/tap.rb
index df720e35eb..13c667f286 100644
--- a/Library/Homebrew/compat/tap.rb
+++ b/Library/Homebrew/compat/tap.rb
@@ -13,7 +13,7 @@ class Tap
 
       old_name = name
       old_path = path
-      old_remote = path.git_origin
+      old_remote = remote
 
       clear_cache
       super(new_user, new_repo)
@@ -24,8 +24,6 @@ class Tap
       ENV[new_initial_revision_var] ||= ENV[old_initial_revision_var]
       ENV[new_current_revision_var] ||= ENV[old_current_revision_var]
 
-      return unless old_path.git?
-
       new_name = name
       new_path = path
       new_remote = default_remote
@@ -36,6 +34,8 @@ class Tap
       path.dirname.mkpath
       FileUtils.mv old_path, new_path
 
+      return unless old_path.git?
+
       puts "Changing remote from #{old_remote} to #{new_remote}..." if $stdout.tty?
       new_path.git_origin = new_remote
     end