From a232e3a791ac97b3ac45ab9d6b34e5c65a49b943 Mon Sep 17 00:00:00 2001
From: Caleb Xu <calebcenter@live.com>
Date: Fri, 24 Aug 2018 11:38:14 -0400
Subject: [PATCH] extract: fix corner case

If the formula to be retrieved was just version-bumped in the most
recent commit (HEAD), we would've ended up grabbing the second-most
recent version.

Instead, if the file already exists in tree at the current commit,
just construct the formula from that to get the version (for naming
purposes) and copy the file outright to its new location.
---
 Library/Homebrew/dev-cmd/extract.rb | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Library/Homebrew/dev-cmd/extract.rb b/Library/Homebrew/dev-cmd/extract.rb
index 9ebec61354..9d19a2ffc6 100644
--- a/Library/Homebrew/dev-cmd/extract.rb
+++ b/Library/Homebrew/dev-cmd/extract.rb
@@ -16,10 +16,18 @@ require "tap"
 
 class BottleSpecification
   def method_missing(*); end
+
+  def respond_to_missing?(*)
+    true
+  end
 end
 
 class Module
   def method_missing(*); end
+
+  def respond_to_missing?(*)
+    true
+  end
 end
 
 class DependencyCollector
@@ -75,6 +83,9 @@ module Homebrew
       end
       odie "Could not find #{name}! The formula or version may not have existed." if test_formula.nil?
       result = Git.last_revision_of_file(repo, file, before_commit: rev)
+    elsif File.exist?(file)
+      version = Formulary.factory(file).version
+      result = File.read(file)
     else
       rev = Git.last_revision_commit_of_file(repo, file)
       version = formula_at_revision(repo, name, file, rev).version