From 7cf8bb4f8c2f4a61da8b555892105f7c82782f3d Mon Sep 17 00:00:00 2001
From: Markus Reiter <me@reitermark.us>
Date: Fri, 27 Jul 2018 02:42:19 +0200
Subject: [PATCH] Add `Diff` unpack strategy.

---
 Library/Homebrew/unpack_strategy.rb      | 2 ++
 Library/Homebrew/unpack_strategy/diff.rb | 9 +++++++++
 2 files changed, 11 insertions(+)
 create mode 100644 Library/Homebrew/unpack_strategy/diff.rb

diff --git a/Library/Homebrew/unpack_strategy.rb b/Library/Homebrew/unpack_strategy.rb
index ff58f7398f..db4311f318 100644
--- a/Library/Homebrew/unpack_strategy.rb
+++ b/Library/Homebrew/unpack_strategy.rb
@@ -10,6 +10,7 @@ module UnpackStrategy
       Otf,
       Air,
       Executable,
+      Diff,
       Jar, # needs to be before Zip
       LuaRock, # needs to be before Zip
       MicrosoftOfficeXml, # needs to be before Zip
@@ -126,6 +127,7 @@ require "unpack_strategy/bzip2"
 require "unpack_strategy/cab"
 require "unpack_strategy/compress"
 require "unpack_strategy/cvs"
+require "unpack_strategy/diff"
 require "unpack_strategy/directory"
 require "unpack_strategy/dmg"
 require "unpack_strategy/executable"
diff --git a/Library/Homebrew/unpack_strategy/diff.rb b/Library/Homebrew/unpack_strategy/diff.rb
new file mode 100644
index 0000000000..e531c3290b
--- /dev/null
+++ b/Library/Homebrew/unpack_strategy/diff.rb
@@ -0,0 +1,9 @@
+require_relative "uncompressed"
+
+module UnpackStrategy
+  class Diff < Uncompressed
+    def self.can_extract?(path:, magic_number:)
+      magic_number.match?(/\A---\040/n)
+    end
+  end
+end