--version/config: show core tap information

Library/Homebrew/cmd/config.rb

@@ -1,6 +1,7 @@
 require "hardware"
 require "software_spec"
 require "rexml/document"
+require "tap"
 
 module Homebrew
   def config
@@ -57,6 +58,18 @@ module Homebrew
     Homebrew.git_origin || "(none)"
   end
 
+  def core_tap_head
+    CoreTap.instance.git_head || "(none)"
+  end
+
+  def core_tap_last_commit
+    CoreTap.instance.git_last_commit || "never"
+  end
+
+  def core_tap_origin
+    CoreTap.instance.remote || "(none)"
+  end
+
   def describe_path(path)
     return "N/A" if path.nil?
     realpath = path.realpath
@@ -144,6 +157,13 @@ module Homebrew
     f.puts "ORIGIN: #{origin}"
     f.puts "HEAD: #{head}"
     f.puts "Last commit: #{last_commit}"
+    if CoreTap.instance.installed?
+      f.puts "Core tap ORIGIN: #{core_tap_origin}"
+      f.puts "Core tap HEAD: #{core_tap_head}"
+      f.puts "Core tap last commit: #{core_tap_last_commit}"
+    else
+      f.puts "Core tap: N/A"
+    end
     f.puts "HOMEBREW_PREFIX: #{HOMEBREW_PREFIX}"
     f.puts "HOMEBREW_REPOSITORY: #{HOMEBREW_REPOSITORY}"
     f.puts "HOMEBREW_CELLAR: #{HOMEBREW_CELLAR}"

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"
 

Library/brew.rb

@@ -7,6 +7,7 @@ require "global"
 
 if ARGV == %w[--version] || ARGV == %w[-v]
   puts "Homebrew #{Homebrew.homebrew_version_string}"
+  puts "Homebrew/homebrew-core #{Homebrew.core_tap_version_string}"
   exit 0
 end