brew info understands taps

Note I removed some of the code that changed the URL to be that of the github.user. Because this doesn't make any sense really. We want people to reference the commit history for whatever fork of homebrew they have checked out. So this is now what it does.

Library/Homebrew/cmd/info.rb

@@ -20,21 +20,30 @@ module Homebrew extend self
     end
   end
 
-  def github_info name
-    formula_name = Formula.path(name).basename
-    user = 'mxcl'
-    branch = 'master'
-
+  def github_fork
     if system "/usr/bin/which -s git"
-      gh_user=`git config --global github.user 2>/dev/null`.chomp
-      /^\*\s*(.*)/.match(`git --git-dir=#{HOMEBREW_REPOSITORY}/.git branch 2>/dev/null`)
-      unless $1.nil? || $1.empty? || $1.chomp == 'master' || gh_user.empty?
-        branch = $1.chomp
-        user = gh_user
+      if `git remote -v` =~ %r{origin\s+(https?://|git@)github.com[:/](.+)/homebrew}
+        $2
       end
     end
+  end
 
-    "http://github.com/#{user}/homebrew/commits/#{branch}/Library/Formula/#{formula_name}"
+  def github_info name
+    path = Formula.path(name).realpath
+
+    if path.to_s =~ %r{#{HOMEBREW_REPOSITORY}/Library/Taps/(\w+)-(\w+)/(.*)}
+      user = $1
+      repo = "homebrew-#$2"
+      path = $3
+    else
+      path.parent.cd do
+        user = github_fork
+      end
+      repo = "homebrew"
+      path = "Library/Formula/#{path.basename}"
+    end
+
+    "https://github.com/#{user}/#{repo}/commits/master/#{path}"
   end
 
   def info_formula f
@@ -68,16 +77,16 @@ module Homebrew extend self
       puts "Not installed"
     end
 
+    history = github_info f.name
+    puts history if history
+
     the_caveats = (f.caveats || "").strip
     unless the_caveats.empty?
       puts
+      ohai "Caveats"
       puts f.caveats
-      puts
     end
 
-    history = github_info f.name
-    puts history if history
-
   rescue FormulaUnavailableError
     # check for DIY installation
     d = HOMEBREW_PREFIX+name