--version/config: show core tap information

1 files changed, 12 insertions, 0 deletions

diff --git a/Library/Homebrew/utils.rb b/Library/Homebrew/utils.rb
index 98ebcc9c8..0675cce5d 100644
--- a/Library/Homebrew/utils.rb
+++ b/Library/Homebrew/utils.rb
@@ -229,6 +229,18 @@ module Homebrew
     end
   end
 
+  def self.core_tap_version_string
+    require "tap"
+    tap = CoreTap.instance
+    return "N/A" unless tap.installed?
+    if pretty_revision = tap.git_short_head
+      last_commit = tap.git_last_commit_date
+      "(git revision #{pretty_revision}; last commit #{last_commit})"
+    else
+      "(no git repository)"
+    end
+  end
+
   def self.install_gem_setup_path!(gem, version = nil, executable = gem)
     require "rubygems"