# Miro - an RSS based video player application
# Copyright (C) 2005-2010 Participatory Culture Foundation
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
#
# In addition, as a special exception, the copyright holders give
# permission to link the code of portions of this program with the OpenSSL
# library.
#
# You must obey the GNU General Public License in all respects for all of
# the code used other than OpenSSL. If you modify file(s) with this
# exception, you may extend this exception to your version of the file(s),
# but you are not obligated to do so. If you do not wish to do so, delete
# this exception statement from your version. If you delete this exception
# statement from all source files in the program, then also delete it here.

"""Customized site-setup script that leaves sys.path alone.

In a normal Python implementation, this module is automatically
imported at startup, and sets up sys.path using various heuristics,
and then does incidental other platform-dependent, heuristic-based
initialization.

We want sys.path to be exactly one entry, so I've stripped out
everything that has to do with augumenting sys.path and for the most
part left the other incidental initializations alone. One exception to
the first part of that sentence is that the logic for dealing with
.pth files has been left alone, just in case.

In any event, this is the very first Python code that runs.
"""

import sys
import os
import __builtin__

# Make up for the fact that it was probably (hopefully??!) impossible
# to import the warnings module during Py_Initialize. Python is
# designed to deal with this case and gracefully notice that it was
# provided later.
import warnings 

def makepath(*paths):
    dir = os.path.abspath(os.path.join(*paths))
    return dir, os.path.normcase(dir)

def abs__file__():
    """Set all module' __file__ attribute to an absolute path"""
    for m in sys.modules.values():
        try:
            m.__file__ = os.path.abspath(m.__file__)
        except AttributeError:
            continue

def removeduppaths():
    """ Remove duplicate entries from sys.path along with making them
    absolute"""
    # This ensures that the initial path provided by the interpreter contains
    # only absolute pathnames, even if we're running from the build directory.
    L = []
    known_paths = set()
    for dir in sys.path:
        # Filter out duplicate paths (on case-insensitive file systems also
        # if they only differ in case); turn relative paths into absolute
        # paths.
        dir, dircase = makepath(dir)
        if not dircase in known_paths:
            L.append(dir)
            known_paths.add(dircase)
    sys.path[:] = L
    return known_paths

def _init_pathinfo():
    """Return a set containing all existing directory entries from sys.path"""
    d = set()
    for dir in sys.path:
        try:
            if os.path.isdir(dir):
                dir, dircase = makepath(dir)
                d.add(dircase)
        except TypeError:
            continue
    return d

def addpackage(sitedir, name, known_paths):
    """Add a new path to known_paths by combining sitedir and 'name' or execute
    sitedir if it starts with 'import'"""
    if known_paths is None:
        _init_pathinfo()
        reset = 1
    else:
        reset = 0
    fullname = os.path.join(sitedir, name)
    try:
        f = open(fullname, "rU")
    except IOError:
        return
    try:
        for line in f:
            if line.startswith("#"):
                continue
            if line.startswith("import"):
                exec line
                continue
            line = line.rstrip()
            dir, dircase = makepath(sitedir, line)
            if not dircase in known_paths and os.path.exists(dir):
                sys.path.append(dir)
                known_paths.add(dircase)
    finally:
        f.close()
    if reset:
        known_paths = None
    return known_paths

def addsitedir(sitedir, known_paths=None):
    """Add 'sitedir' argument to sys.path if missing and handle .pth files in
    'sitedir'"""
    if known_paths is None:
        known_paths = _init_pathinfo()
        reset = 1
    else:
        reset = 0
    sitedir, sitedircase = makepath(sitedir)
    if not sitedircase in known_paths:
        sys.path.append(sitedir)        # Add path component
    try:
        names = os.listdir(sitedir)
    except os.error:
        return
    names.sort()
    for name in names:
        if name.endswith(os.extsep + "pth"):
            addpackage(sitedir, name, known_paths)
    if reset:
        known_paths = None
    return known_paths


def setquit():
    """Define new built-ins 'quit' and 'exit'.
    These are simply strings that display a hint on how to exit.

    """
    if os.sep == ':':
        exit = 'Use Cmd-Q to quit.'
    elif os.sep == '\\':
        exit = 'Use Ctrl-Z plus Return to exit.'
    else:
        exit = 'Use Ctrl-D (i.e. EOF) to exit.'
    __builtin__.quit = __builtin__.exit = exit


class _Printer(object):
    """interactive prompt objects for printing the license text, a list of
    contributors and the copyright notice."""

    MAXLINES = 23

    def __init__(self, name, data, files=(), dirs=()):
        self.__name = name
        self.__data = data
        self.__files = files
        self.__dirs = dirs
        self.__lines = None

    def __setup(self):
        if self.__lines:
            return
        data = None
        for dir in self.__dirs:
            for filename in self.__files:
                filename = os.path.join(dir, filename)
                try:
                    fp = file(filename, "rU")
                    data = fp.read()
                    fp.close()
                    break
                except IOError:
                    pass
            if data:
                break
        if not data:
            data = self.__data
        self.__lines = data.split('\n')
        self.__linecnt = len(self.__lines)

    def __repr__(self):
        self.__setup()
        if len(self.__lines) <= self.MAXLINES:
            return "\n".join(self.__lines)
        else:
            return "Type %s() to see the full %s text" % ((self.__name,)*2)

    def __call__(self):
        self.__setup()
        prompt = 'Hit Return for more, or q (and Return) to quit: '
        lineno = 0
        while 1:
            try:
                for i in range(lineno, lineno + self.MAXLINES):
                    print self.__lines[i]
            except IndexError:
                break
            else:
                lineno += self.MAXLINES
                key = None
                while key is None:
                    key = raw_input(prompt)
                    if key not in ('', 'q'):
                        key = None
                if key == 'q':
                    break

def setcopyright():
    """Set 'copyright' and 'credits' in __builtin__"""
    __builtin__.copyright = _Printer("copyright", sys.copyright)
    if sys.platform[:4] == 'java':
        __builtin__.credits = _Printer(
            "credits",
            "Jython is maintained by the Jython developers (www.jython.org).")
    else:
        __builtin__.credits = _Printer("credits", """\
    Thanks to CWI, CNRI, BeOpen.com, Zope Corporation and a cast of thousands
    for supporting Python development.  See www.python.org for more information.""")
    here = os.path.dirname(os.__file__)
    __builtin__.license = _Printer(
        "license", "See http://www.python.org/%.3s/license.html" % sys.version,
        ["LICENSE.txt", "LICENSE"],
        [os.path.join(here, os.pardir), here, os.curdir])


class _Helper(object):
    """This normally handles the built-in 'help', but here it's stubbed
out to avoid pulling in pydoc."""
    def __repr__(self):
        return "Help not available."
    def __call__(self, *args, **kwds):
        return "Help not available."

def sethelper():
    __builtin__.help = _Helper()

def aliasmbcs():
    """On Windows, some default encodings are not provided by Python,
    while they are always available as "mbcs" in each locale. Make
    them usable by aliasing to "mbcs" in such a case."""
    if sys.platform == 'win32':
        import locale, codecs
        enc = locale.getdefaultlocale()[1]
        if enc.startswith('cp'):            # "cp***" ?
            try:
                codecs.lookup(enc)
            except LookupError:
                import encodings
                encodings._cache[enc] = encodings._unknown
                encodings.aliases.aliases[enc] = 'mbcs'

def setencoding():
    """Set the string encoding used by the Unicode implementation.  The
    default is 'ascii', but if you're willing to experiment, you can
    change this."""
    encoding = "utf-8" # The character set of the Democracy log file
    if 0:
        # Enable to support locale aware default string encodings.
        import locale
        loc = locale.getdefaultlocale()
        if loc[1]:
            encoding = loc[1]
    if 0:
        # Enable to switch off string to Unicode coercion and implicit
        # Unicode to string conversion.
        encoding = "undefined"
    if encoding != "ascii":
        # On Non-Unicode builds this will raise an AttributeError...
        sys.setdefaultencoding(encoding) # Needs Python Unicode build !

def execsitecustomize():
    """Run custom site specific code, if available."""
    try:
        import sitecustomize
    except ImportError:
        pass

def main():
    abs__file__()
    paths_in_sys = removeduppaths()
    setquit()
    setcopyright()
    sethelper()
    aliasmbcs()
    setencoding()
    execsitecustomize()
    # Remove sys.setdefaultencoding() so that users cannot change the
    # encoding after initialization.  The test for presence is needed when
    # this module is run as a script, because this code is executed twice.
    if hasattr(sys, "setdefaultencoding"):
        del sys.setdefaultencoding

main()

def _test():
    print "sys.path = ["
    for dir in sys.path:
        print "    %r," % (dir,)
    print "]"

if __name__ == '__main__':
    _test()
