| Age | Commit message (Collapse) | Author | 
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Only run the `python do ... end` loop once even if
multiple `depends_on :python => 'module-name'` are
present.
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* Fixes #20572 by tweaking the logic that decides
  which python is used by the `python` object
  inside a formula. There was a bug when on 10.6
  there is no Python 2.7 but a :recommended
  Python was still treated as being available.
* Use the user's PATH when looking for an external
  Python. Until now only brewed or OS X system's
  python have been found by `depends_on :python`.
  But now we support any Python in PATH (e.g.
  pyenv's python).
* Further, instead of handling python modules
  and import tests in LanguageModuleDependency,
  these are now handled by:
        depends_on :python => 'numpy'  # for example
  The old style
        depends_on 'numpy' => :python
  is still supported and is only an alias
  for the newer style (only for :python, the
  other languages are not altered by this commit).
  The reasoning is that if a formula requires
  a python module, it basically also needs
  python itself - and further that specific
  version of python has to provide the module.
  So the `PythonInstalled` is the natural place
  to check for the availability of a python
  module.
  Using a python module and other tags like
  :optional or :recommended is done like so:
        depends_on :python => [:optional, 'numpy']
  Specifying another PyPi (Python Package index)
  name than the module import name is seldom used
  but supported, too:
         depends_on :python => ['enchant'=>'pyenchant']
  A last note: For clarity, you can define
  multiple depends_on statements with different
  modules to be importable.`
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Setting LDFLAGS to `-F HOMEBREW_PREFIX/opt/python/Frameworks`
breaks at least the scipy build. Perhaps others, too.
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* The python do ... end block does no longer
  require 'superenv' but saves and restores
  the ENV by using ENV.to_hash and `ensure`.
  This should resolve some build problems
  with formulae using `env :std`!
* `python_helper` is now in a module `Python`.
* Imporoved some comments in python_dependency.rb
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This applies only to non-brewed python:
The user will still have to set his PYTHONPATH
in order to import python modules in an
external python interpreter. However, a
warning will be displayed, now.
Further, during the build, the PYTHONPATH
will be set to Homebrew's global site-packages
so that software (like PyQt and others) that
need to `import sipconfig` in python can
find the brewed sip and its python module.
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Since Python has been removed from superenv and
added as an explicit `depends_on :python`,
we should add
`-F#{HOMEBREW_PREFIX}/opt/python/Framewoks`
so that build tools that don't use
`python-config --ldflags` (as they should!)
can link against brewed Python.
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Now it is only shown for an `python do ... end` block
and not for ordinary python.site_packages or other
methods.
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New `depends_on :python` Dependency.
New `depends_on :python3` Dependency.
To avoid having multiple formulae with endings -py2 and -py3,
we will handle support for different pythons (2.x vs. 3.x)
in the same formula.
Further brewed vs. external python will be transparently supported.
The formula also gets a new object `python`, which is false if
no Python is available or the user has disabled it. Otherwise
it is defined and provides several support methods:
python.site_packages # the site-packages in the formula's Cellar
python.global_site_packages
python.binary # the full path to the python binary
python.prefix
python.version
python.version.major
python.version.minor
python.xy # => e.g. "python2.7"
python.incdir # includes of python
python.libdir # the python dylib library
python.pkg_config_path # used internally by brew
python.from_osx?
python.framework?
python.universal?
python.pypy?
python.standard_caveats # Text to set PYTHONPATH for python.from_osx?
python.if3then3 # => "" for 2.x and to "3" for 3.x.
Further, to avoid code duplication, `python` takes an optional
block that is run twice if the formula defines depends_on
:python AND :python3.
python do
  system python, 'setup.py', "--prefix=#{prefix}"
end
Read more in the Homebrew wiki.
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