python: Allow --with-brewed-tk.

- Fixes Homebrew/homebrew#16574.
- Improve Tkinter test by actually calling Tk()
- Check for /Library/Frameworks/Tk.framework no longer needed.
- Also remove Tk.framework check from python3.rb
- Fix PYTHONFRAMEWORKDIR so that `python-config --ldflags` is useful.

Closes Homebrew/homebrew#17008.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/python.rb

@@ -1,20 +1,5 @@
 require 'formula'
 
-class TkCheck < Requirement
-  def message; <<-EOS.undent
-    Tk.framework was detected in /Library/Frameworks
-    This can cause Python builds to fail. See:
-      https://github.com/mxcl/homebrew/issues/11602
-    EOS
-  end
-
-  def fatal?; false; end
-
-  def satisfied?
-    not File.exist? '/Library/Frameworks/Tk.framework'
-  end
-end
-
 class Distribute < Formula
   url 'http://pypi.python.org/packages/source/d/distribute/distribute-0.6.34.tar.gz'
   sha1 'b6f9cfbaf3e63833b71009812a613be13e68f5de'
@@ -30,20 +15,20 @@ class Python < Formula
   url 'http://www.python.org/ftp/python/2.7.3/Python-2.7.3.tar.bz2'
   sha1 '842c4e2aff3f016feea3c6e992c7fa96e49c9aa0'
 
-  depends_on TkCheck.new
+  option :universal
+  option 'quicktest', 'Run `make quicktest` after the build'
+  option 'with-brewed-openssl', "Use Homebrew's openSSL instead of the one from OS X"
+  option 'with-brewed-tk', "Use Homebrew's Tk (has optional Cocoa and threads support)"
+  option 'with-poll', 'Enable select.poll, which is not fully implemented on OS X (http://bugs.python.org/issue5154)'
+  # --with-dtrace relies on CLT as dtrace hard-codes paths to /usr
+  option 'with-dtrace', 'Experimental DTrace support (http://bugs.python.org/issue13405)' if MacOS::CLT.installed?
+
   depends_on 'pkg-config' => :build
   depends_on 'readline' => :recommended
   depends_on 'sqlite' => :recommended
   depends_on 'gdbm' => :recommended
   depends_on 'openssl' if build.include? 'with-brewed-openssl'
-
+  depends_on 'homebrew/dupes/tk' if build.include? 'with-brewed-tk'
-  option :universal
-  option 'quicktest', 'Run `make quicktest` after the build'
-  option 'with-brewed-openssl', "Use Homebrew's openSSL instead of the one from OS X"
-  option 'with-poll', 'Enable select.poll, which is not fully implemented on OS X (http://bugs.python.org/issue5154)'
-
-  # --with-dtrace relies on CLT as dtrace hard-codes paths to /usr
-  option 'with-dtrace', 'Experimental DTrace support (http://bugs.python.org/issue13405)' if MacOS::CLT.installed?
 
   def patches
     p = []
@@ -51,7 +36,8 @@ class Python < Formula
     # see http://bugs.python.org/issue14662
     p << "https://gist.github.com/raw/4349132/25662c6b382315b5db67bf949773d76471bbcee7/python-nfs-shutil.diff"
     p << 'https://raw.github.com/gist/3415636/2365dea8dc5415daa0148e98c394345e1191e4aa/pythondtrace-patch.diff' if build.include? 'with-dtrace'
-
+    # Patch to disable the search for Tk.frameworked, since homebrew's Tk is a plain unix build
+    p << DATA if build.include? 'with-brewed-tk'
     p
   end
 
@@ -182,6 +168,7 @@ class Python < Formula
         s.gsub!(/^CXX=.*$/, "CXX=xcrun clang++")
         s.gsub!(/^AR=.*$/, "AR=xcrun ar")
         s.gsub!(/^RANLIB=.*$/, "RANLIB=xcrun ranlib")
+        s.gsub!(/^PYTHONFRAMEWORKDIR=\tPython\.framework/, "PYTHONFRAMEWORKDIR= #{opt_prefix}/Frameworks/Python.framework")
       end
     end
 
@@ -196,11 +183,13 @@ class Python < Formula
         # Help Python's build system (distribute/pip) to build things on Xcode-only systems
         # The setup.py looks at "-isysroot" to get the sysroot (and not at --sysroot)
         cflags += " -isysroot #{MacOS.sdk_path}"
-        # For the Xlib.h, Python needs this header dir
-        cflags += " -I#{MacOS.sdk_path}/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers"
         ldflags += " -isysroot #{MacOS.sdk_path}"
         # Same zlib.h-not-found-bug as in env :std (see below)
         args << "CPPFLAGS=-I#{MacOS.sdk_path}/usr/include"
+        # For the Xlib.h, Python needs this header dir with the system Tk
+        unless build.include? 'with-brewed-tk'
+          cflags += " -I#{MacOS.sdk_path}/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers"
+        end
       end
       args << cflags
       args << ldflags
@@ -260,6 +249,7 @@ class Python < Formula
 
       They will install into the site-package directory
         #{site_packages}
+
       Executable python scripts will be put in:
         #{scripts_folder}
       so you may want to put "#{scripts_folder}" in your PATH, too.
@@ -273,6 +263,25 @@ class Python < Formula
     # and it can occur that building sqlite silently fails if OSX's sqlite is used.
     system "#{bin}/python", "-c", "import sqlite3"
     # Check if some other modules import. Then the linked libs are working.
-    system "#{bin}/python", "-c", "import Tkinter"
+    system "#{bin}/python", "-c", "import Tkinter; root = Tkinter.Tk()"
   end
 end
+
+__END__
+diff --git a/setup.py b/setup.py
+index 6b47451..b0400f8 100644
+--- a/setup.py
++++ b/setup.py
+@@ -1702,9 +1702,9 @@ class PyBuildExt(build_ext):
+         # AquaTk is a separate method. Only one Tkinter will be built on
+         # Darwin - either AquaTk, if it is found, or X11 based Tk.
+         platform = self.get_platform()
+-        if (platform == 'darwin' and
+-            self.detect_tkinter_darwin(inc_dirs, lib_dirs)):
+-            return
++        # if (platform == 'darwin' and
++        #     self.detect_tkinter_darwin(inc_dirs, lib_dirs)):
++        #     return
+
+         # Assume we haven't found any of the libraries or include files
+         # The versions with dots are used on Unix, and the versions without

Formula/python3.rb

@@ -1,5 +1,4 @@
 require 'formula'
-require Formula.path("python") # For TkCheck requirement
 
 # Python3 is the new language standard, not just a new revision.
 # It's somewhat incompatible with Python 2.x, therefore, the executable
@@ -22,7 +21,6 @@ class Python3 < Formula
   sha1 '3e1464bc2c1dfa74287bc58da81168f50b0ae5c7'
   VER='3.3'  # The <major>.<minor> is used so often.
 
-  depends_on TkCheck.new
   depends_on 'pkg-config' => :build
   depends_on 'readline' => :recommended
   depends_on 'sqlite' => :recommended