exaile_win.py

#!/usr/bin/env python3

"""Launcher for Exaile on Windows"""


import builtins
import msvcrt
import sys
import os
from ctypes import windll


# Provide dummy sys.stdout and sys.stderr, which are None in noconsole/windowed
# mode (launched using pythonw.exe, or PyInstaller build).
if sys.stdout is None:
    sys.stdout = open(os.devnull, "w")
if sys.stderr is None:
    sys.stderr = open(os.devnull, "w")


__builtin__open = __builtins__.open


def __open_inheritance_hack(*args, **kwargs):
    """Make file handles not inheritable, that way we can restart on the fly"""
    # From http://www.virtualroadside.com/blog/index.php/2013/02/06/problems-with-file-descriptors-being-inherited-by-default-in-python/
    result = __builtin__open(*args, **kwargs)
    handle = msvcrt.get_osfhandle(result.fileno())
    windll.kernel32.SetHandleInformation(handle, 1, 0)
    return result


builtins.open = __open_inheritance_hack


def error(message1, message2=None, die=True):
    import logging

    """Show error message and exit.

    If two message arguments are supplied, the first one will be used as title.
    If `die` is true, exit after showing the message.
    """
    logging.error(message1 + (('\r\n\r\n' + message2) if message2 else ''))
    if sys.stdout.isatty():
        if die:
            print("\r\n[Press Enter to exit.]", file=sys.stderr)
            input()
    else:
        import ctypes

        if not message2:
            message1, message2 = message2, message1
        ctypes.windll.user32.MessageBoxW(None, message2, message1, 0x10)
    if die:
        sys.exit(1)


def main():
    import logging

    logging.basicConfig(
        level=logging.INFO, datefmt="%H:%M:%S", format="%(levelname)-8s: %(message)s"
    )

    aio_message = (
        "\r\n\r\nPlease run the 'All-In-One PyGI/PyGObject for "
        "Windows Installer' and ensure that the following are selected:"
        "\r\n\r\n"
        "* GTK+ 3.x\r\n"
        "* GStreamer 1.x and the gst-plugins package(s)\r\n"
        "\r\n"
        "The 'All-In-One PyGI/PyGObject for Windows Installer' "
        "can be downloaded at\r\n"
        "https://sourceforge.net/projects/pygobjectwin32/\r\n\r\n"
        "See README.Windows for more information."
    )

    try:
        import gi
    except Exception:
        error("PyGObject not found", "PyGObject could not be imported. " + aio_message)
    else:
        logging.info("PyGObject works")
    try:
        gi.require_version('Gtk', '3.0')
        from gi.repository import Gtk
    except Exception:
        error("GTK+ not found", "GTK+ could not be imported. " + aio_message)
    else:
        logging.info("GTK+ works")

    try:
        gi.require_version('Gst', '1.0')
        from gi.repository import Gst
    except Exception:
        error("GStreamer not found", "GStreamer could not be imported. " + aio_message)
    else:
        logging.info("GStreamer works")

    try:
        import mutagen
    except Exception:
        error(
            "Mutagen not found",
            "The Python module Mutagen could not be imported. For download "
            "and installation instructions see "
            "https://mutagen.readthedocs.io/en/latest/\r\n\r\n"
            "See README.Windows for more information.",
        )
    else:
        logging.info("Mutagen works")

    # disable the logging before starting exaile.. otherwise it gets
    # configured twice and we get double the log messages!
    logging = None
    del sys.modules['logging']

    try:
        sys.argv[1:1] = ['--startgui', '--no-dbus', '--no-hal']
        import exaile

        exaile.main()
    except Exception:
        import traceback

        error("Error while running exaile.main()", traceback.format_exc())


if __name__ == '__main__':
    main()

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