From ff2ce2f0936bf5a271a1fbdf834f55b94c08062a Mon Sep 17 00:00:00 2001
From: Caleb Xu <calebcenter@live.com>
Date: Sat, 25 Aug 2018 13:35:08 -0400
Subject: [PATCH] extract: better success message

Fixes the empty rev string when copying file from HEAD; explicitly
set rev to HEAD in that case.
---
 Library/Homebrew/dev-cmd/extract.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Library/Homebrew/dev-cmd/extract.rb b/Library/Homebrew/dev-cmd/extract.rb
index fb0066d347..8c9239b167 100644
--- a/Library/Homebrew/dev-cmd/extract.rb
+++ b/Library/Homebrew/dev-cmd/extract.rb
@@ -95,6 +95,7 @@ module Homebrew
       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)
+      rev = "HEAD"
       version = Formulary.factory(file).version
       result = File.read(file)
     else
@@ -122,7 +123,7 @@ module Homebrew
       ohai "Overwriting existing formula at #{path}" if ARGV.debug?
       path.delete
     end
-    ohai "Writing formula for #{name} from #{rev} to #{path}"
+    ohai "Writing formula for #{name} from revision #{rev} to #{path}"
     path.write result
   end