# packagescan.py - Helper module for identifing used modules.

# Used for the py2exe distutil.

# This module must be the first mercurial module imported in setup.py

#

# Copyright 2005 Volker Kleinfeld <Volker.Kleinfeld@gmx.de>

#

# This software may be used and distributed according to the terms

# of the GNU General Public License, incorporated herein by reference.

import glob

import os

import sys

import ihooks

import types

import string

# Install this module as fake demandload module

sys.modules['mercurial.demandload'] = sys.modules[__name__]

# Requiredmodules contains the modules imported by demandload.

# Please note that demandload can be invoked before the 

# mercurial.packagescan.scan method is invoked in case a mercurial

# module is imported.

requiredmodules = {} 

def demandload(scope, modules):

    """ fake demandload function that collects the required modules 

        foo            import foo

        foo bar        import foo, bar

        foo.bar        import foo.bar

        foo:bar        from foo import bar

        foo:bar,quux   from foo import bar, quux

        foo.bar:quux   from foo.bar import quux"""

    for m in modules.split():

        mod = None

        try:

            module, fromlist = m.split(':')

            fromlist = fromlist.split(',')

        except:

            module = m

            fromlist = []

        mod = __import__(module, scope, scope, fromlist)

        if fromlist == []:

            # mod is only the top package, but we need all packages

            comp = module.split('.')

            i = 1

            mn = comp[0]

            while True:

                # mn and mod.__name__ might not be the same

                scope[mn] = mod

                requiredmodules[mod.__name__] = 1

                if len(comp) == i: break

                mod = getattr(mod,comp[i]) 

                mn = string.join(comp[:i+1],'.')

                i += 1

        else:

            # mod is the last package in the component list

            requiredmodules[mod.__name__] = 1

            for f in fromlist:

                scope[f] = getattr(mod,f)

                if type(scope[f]) == types.ModuleType:

                    requiredmodules[scope[f].__name__] = 1

def scan(libpath,packagename):

    """ helper for finding all required modules of package <packagename> """

    # Use the package in the build directory

    libpath = os.path.abspath(libpath)

    sys.path.insert(0,libpath)

    packdir = os.path.join(libpath,packagename.replace('.', '/'))

    # A normal import would not find the package in

    # the build directory. ihook is used to force the import.

    # After the package is imported the import scope for

    # the following imports is settled.

    p = importfrom(packdir)

    globals()[packagename] = p

    sys.modules[packagename] = p

    # Fetch the python modules in the package

    cwd = os.getcwd()

    os.chdir(packdir)

    pymodulefiles = glob.glob('*.py')

    extmodulefiles = glob.glob('*.pyd')

    os.chdir(cwd)

    # Import all python modules and by that run the fake demandload

    for m in pymodulefiles:

        if m == '__init__.py': continue

        tmp = {}

        mname,ext = os.path.splitext(m)

        fullname = packagename+'.'+mname

        __import__(fullname,tmp,tmp)

        requiredmodules[fullname] = 1

    # Import all extension modules and by that run the fake demandload

    for m in extmodulefiles:

        tmp = {}

        mname,ext = os.path.splitext(m)

        fullname = packagename+'.'+mname

        __import__(fullname,tmp,tmp)

        requiredmodules[fullname] = 1

def getmodules():

    return requiredmodules.keys()

def importfrom(filename):

    """

    import module/package from a named file and returns the module.

    It does not check on sys.modules or includes the module in the scope.

    """

    loader = ihooks.BasicModuleLoader()

    path, file = os.path.split(filename)

    name, ext  = os.path.splitext(file)

    m = loader.find_module_in_dir(name, path)

    if not m:

        raise ImportError, name

    m = loader.load_module(name, m)

    return m