# win32.py - utility functions that use win32 API

#

# Copyright 2005-2009 Matt Mackall <mpm@selenic.com> and others

#

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

# GNU General Public License version 2 or any later version.

"""Utility functions that use win32 API.

Mark Hammond's win32all package allows better functionality on

Windows. This module overrides definitions in util.py. If not

available, import of this module will fail, and generic code will be

used.

"""

import win32api

import errno, os, sys, pywintypes, win32con, win32file, win32process

import osutil, encoding

from win32com.shell import shell, shellcon

def os_link(src, dst):

    try:

        win32file.CreateHardLink(dst, src)

        # CreateHardLink sometimes succeeds on mapped drives but

        # following nlinks() returns 1. Check it now and bail out.

        if nlinks(src) < 2:

            try:

                win32file.DeleteFile(dst)

            except:

                pass

            # Fake hardlinking error

            raise OSError(errno.EINVAL, 'Hardlinking not supported')

    except pywintypes.error, details:

        raise OSError(errno.EINVAL, 'target implements hardlinks improperly')

    except NotImplementedError: # Another fake error win Win98

        raise OSError(errno.EINVAL, 'Hardlinking not supported')

def _getfileinfo(pathname):

    """Return number of hardlinks for the given file."""

    try:

        fh = win32file.CreateFile(pathname,

            win32file.GENERIC_READ, win32file.FILE_SHARE_READ,

            None, win32file.OPEN_EXISTING, 0, None)

        try:

            return win32file.GetFileInformationByHandle(fh)

        finally:

            fh.Close()

    except pywintypes.error:

        return None

def nlinks(pathname):

    """Return number of hardlinks for the given file."""

    res = _getfileinfo(pathname)

    if res is not None:

        return res[7]

    else:

        return os.lstat(pathname).st_nlink

def samefile(fpath1, fpath2):

    """Returns whether fpath1 and fpath2 refer to the same file. This is only

    guaranteed to work for files, not directories."""

    res1 = _getfileinfo(fpath1)

    res2 = _getfileinfo(fpath2)

    if res1 is not None and res2 is not None:

        # Index 4 is the volume serial number, and 8 and 9 contain the file ID

        return res1[4] == res2[4] and res1[8] == res2[8] and res1[9] == res2[9]

    else:

        return False

def samedevice(fpath1, fpath2):

    """Returns whether fpath1 and fpath2 are on the same device. This is only

    guaranteed to work for files, not directories."""

    res1 = _getfileinfo(fpath1)

    res2 = _getfileinfo(fpath2)

    if res1 is not None and res2 is not None:

        return res1[4] == res2[4]

    else:

        return False

def testpid(pid):

    '''return True if pid is still running or unable to

    determine, False otherwise'''

    try:

        handle = win32api.OpenProcess(

            win32con.PROCESS_QUERY_INFORMATION, False, pid)

        if handle:

            status = win32process.GetExitCodeProcess(handle)

            return status == win32con.STILL_ACTIVE

    except pywintypes.error, details:

        return details[0] != winerror.ERROR_INVALID_PARAMETER

    return True

def lookup_reg(key, valname=None, scope=None):

    ''' Look up a key/value name in the Windows registry.

    valname: value name. If unspecified, the default value for the key

    is used.

    scope: optionally specify scope for registry lookup, this can be

    a sequence of scopes to look up in order. Default (CURRENT_USER,

    LOCAL_MACHINE).

    '''

    try:

        from _winreg import HKEY_CURRENT_USER, HKEY_LOCAL_MACHINE, \

            QueryValueEx, OpenKey

    except ImportError:

        return None

    if scope is None:

        scope = (HKEY_CURRENT_USER, HKEY_LOCAL_MACHINE)

    elif not isinstance(scope, (list, tuple)):

        scope = (scope,)

    for s in scope:

        try:

            val = QueryValueEx(OpenKey(s, key), valname)[0]

            # never let a Unicode string escape into the wild

            return encoding.tolocal(val.encode('UTF-8'))

        except EnvironmentError:

            pass

def system_rcpath_win32():

    '''return default os-specific hgrc search path'''

    proc = win32api.GetCurrentProcess()

    try:

        # This will fail on windows < NT

        filename = win32process.GetModuleFileNameEx(proc, 0)

    except:

        filename = win32api.GetModuleFileName(0)

    # Use mercurial.ini found in directory with hg.exe

    progrc = os.path.join(os.path.dirname(filename), 'mercurial.ini')

    if os.path.isfile(progrc):

        return [progrc]

    # Use hgrc.d found in directory with hg.exe

    progrcd = os.path.join(os.path.dirname(filename), 'hgrc.d')

    if os.path.isdir(progrcd):

        rcpath = []

        for f, kind in osutil.listdir(progrcd):

            if f.endswith('.rc'):

                rcpath.append(os.path.join(progrcd, f))

        return rcpath

    # else look for a system rcpath in the registry

    try:

        value = win32api.RegQueryValue(

                win32con.HKEY_LOCAL_MACHINE, 'SOFTWARE\\Mercurial')

        rcpath = []

        for p in value.split(os.pathsep):

            if p.lower().endswith('mercurial.ini'):

                rcpath.append(p)

            elif os.path.isdir(p):

                for f, kind in osutil.listdir(p):

                    if f.endswith('.rc'):

                        rcpath.append(os.path.join(p, f))

        return rcpath

    except pywintypes.error:

        return []

def user_rcpath_win32():

    '''return os-specific hgrc search path to the user dir'''

    userdir = os.path.expanduser('~')

    if sys.getwindowsversion()[3] != 2 and userdir == '~':

        # We are on win < nt: fetch the APPDATA directory location and use

        # the parent directory as the user home dir.

        appdir = shell.SHGetPathFromIDList(

            shell.SHGetSpecialFolderLocation(0, shellcon.CSIDL_APPDATA))

        userdir = os.path.dirname(appdir)

    return [os.path.join(userdir, 'mercurial.ini'),

            os.path.join(userdir, '.hgrc')]

def getuser():

    '''return name of current user'''

    return win32api.GetUserName()

def set_signal_handler_win32():

    """Register a termination handler for console events including

    CTRL+C. python signal handlers do not work well with socket

    operations.

    """

    def handler(event):

        win32process.ExitProcess(1)

    win32api.SetConsoleCtrlHandler(handler)

def hidewindow():

    def callback(*args, **kwargs):

        hwnd, pid = args

        wpid = win32process.GetWindowThreadProcessId(hwnd)[1]

        if pid == wpid:

            win32gui.ShowWindow(hwnd, win32con.SW_HIDE)

    pid =  win32process.GetCurrentProcessId()

    win32gui.EnumWindows(callback, pid)