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startup.py

__license__   = 'GPL v3'
__copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
__docformat__ = 'restructuredtext en'

'''
Perform various initialization tasks.
'''

import locale, sys, os

# Default translation is NOOP
import __builtin__
__builtin__.__dict__['_'] = lambda s: s

# For strings which belong in the translation tables, but which shouldn't be
# immediately translated to the environment language
__builtin__.__dict__['__'] = lambda s: s

from calibre.constants import iswindows, preferred_encoding, plugins

_run_once = False
winutil = winutilerror = None

if not _run_once:
    _run_once = True

    ################################################################################
    # Platform specific modules
    if iswindows:
        winutil, winutilerror = plugins['winutil']
        if not winutil:
            raise RuntimeError('Failed to load the winutil plugin: %s'%winutilerror)
        if len(sys.argv) > 1 and not isinstance(sys.argv[1], unicode):
            sys.argv[1:] = winutil.argv()[1-len(sys.argv):]

    ################################################################################
    # Convert command line arguments to unicode
    for i in range(1, len(sys.argv)):
        if not isinstance(sys.argv[i], unicode):
            sys.argv[i] = sys.argv[i].decode(preferred_encoding, 'replace')

    ################################################################################
    # Setup resources
    import calibre.utils.resources as resources
    resources


    ################################################################################
    # Setup translations
    from calibre.utils.localization import set_translators

    set_translators()

    ################################################################################
    # Initialize locale
    try:
        locale.setlocale(locale.LC_ALL, '')
    except:
        dl = locale.getdefaultlocale()
        try:
            if dl:
                locale.setlocale(dl[0])
        except:
            pass

    ################################################################################
    # Improve builtin path functions to handle unicode sensibly

    _abspath = os.path.abspath
    def my_abspath(path, encoding=sys.getfilesystemencoding()):
        '''
        Work around for buggy os.path.abspath. This function accepts either byte strings,
        in which it calls os.path.abspath, or unicode string, in which case it first converts
        to byte strings using `encoding`, calls abspath and then decodes back to unicode.
        '''
        to_unicode = False
        if encoding is None:
            encoding = preferred_encoding
        if isinstance(path, unicode):
            path = path.encode(encoding)
            to_unicode = True
        res = _abspath(path)
        if to_unicode:
            res = res.decode(encoding)
        return res

    os.path.abspath = my_abspath

    _join = os.path.join
    def my_join(a, *p):
        encoding=sys.getfilesystemencoding()
        if not encoding:
            encoding = preferred_encoding
        p = [a] + list(p)
        _unicode = False
        for i in p:
            if isinstance(i, unicode):
                _unicode = True
                break
        p = [i.encode(encoding) if isinstance(i, unicode) else i for i in p]

        res = _join(*p)
        if _unicode:
            res = res.decode(encoding)
        return res

    os.path.join = my_join




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