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/Lib/lib-tk/FixTk.py

http://unladen-swallow.googlecode.com/
Python | 76 lines | 56 code | 4 blank | 16 comment | 20 complexity | 475f035510e0d5f1d03112b3c4b6415e MD5 | raw file
 1import sys, os
 2
 3# Delay import _tkinter until we have set TCL_LIBRARY,
 4# so that Tcl_FindExecutable has a chance to locate its
 5# encoding directory.
 6
 7# Unfortunately, we cannot know the TCL_LIBRARY directory
 8# if we don't know the tcl version, which we cannot find out
 9# without import Tcl. Fortunately, Tcl will itself look in
10# <TCL_LIBRARY>\..\tcl<TCL_VERSION>, so anything close to
11# the real Tcl library will do.
12
13# Expand symbolic links on Vista
14try:
15    import ctypes
16    ctypes.windll.kernel32.GetFinalPathNameByHandleW
17except (ImportError, AttributeError):
18    def convert_path(s):
19        return s
20else:
21    def convert_path(s):
22        if isinstance(s, str):
23            s = s.decode("mbcs")
24        hdir = ctypes.windll.kernel32.\
25            CreateFileW(s, 0x80,    # FILE_READ_ATTRIBUTES
26                        1,          # FILE_SHARE_READ
27                        None, 3,    # OPEN_EXISTING
28                        0x02000000, # FILE_FLAG_BACKUP_SEMANTICS
29                        None)
30        if hdir == -1:
31            # Cannot open directory, give up
32            return s
33        buf = ctypes.create_unicode_buffer(u"", 32768)
34        res = ctypes.windll.kernel32.\
35            GetFinalPathNameByHandleW(hdir, buf, len(buf),
36                                      0) # VOLUME_NAME_DOS
37        ctypes.windll.kernel32.CloseHandle(hdir)
38        if res == 0:
39            # Conversion failed (e.g. network location)
40            return s
41        s = buf[:res]
42        # Ignore leading \\?\
43        if s.startswith(u"\\\\?\\"):
44            s = s[4:]
45        return s
46
47prefix = os.path.join(sys.prefix,"tcl")
48if not os.path.exists(prefix):
49    # devdir/../tcltk/lib
50    prefix = os.path.join(sys.prefix, os.path.pardir, "tcltk", "lib")
51    prefix = os.path.abspath(prefix)
52# if this does not exist, no further search is needed
53if os.path.exists(prefix):
54    prefix = convert_path(prefix)
55    if not os.environ.has_key("TCL_LIBRARY"):
56        for name in os.listdir(prefix):
57            if name.startswith("tcl"):
58                tcldir = os.path.join(prefix,name)
59                if os.path.isdir(tcldir):
60                    os.environ["TCL_LIBRARY"] = tcldir
61    # Compute TK_LIBRARY, knowing that it has the same version
62    # as Tcl
63    import _tkinter
64    ver = str(_tkinter.TCL_VERSION)
65    if not os.environ.has_key("TK_LIBRARY"):
66        v = os.path.join(prefix, 'tk'+ver)
67        if os.path.exists(os.path.join(v, "tclIndex")):
68            os.environ['TK_LIBRARY'] = v
69    # We don't know the Tix version, so we must search the entire
70    # directory
71    if not os.environ.has_key("TIX_LIBRARY"):
72        for name in os.listdir(prefix):
73            if name.startswith("tix"):
74                tixdir = os.path.join(prefix,name)
75                if os.path.isdir(tixdir):
76                    os.environ["TIX_LIBRARY"] = tixdir