# 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, incorporated herein by reference.

import win32api

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

import cStringIO, winerror

import osutil, encoding

import util

from win32com.shell import shell,shellcon

class WinError(Exception):

    winerror_map = {

        winerror.ERROR_ACCESS_DENIED: errno.EACCES,

        winerror.ERROR_ACCOUNT_DISABLED: errno.EACCES,

        winerror.ERROR_ACCOUNT_RESTRICTION: errno.EACCES,

        winerror.ERROR_ALREADY_ASSIGNED: errno.EBUSY,

        winerror.ERROR_ALREADY_EXISTS: errno.EEXIST,

        winerror.ERROR_ARITHMETIC_OVERFLOW: errno.ERANGE,

        winerror.ERROR_BAD_COMMAND: errno.EIO,

        winerror.ERROR_BAD_DEVICE: errno.ENODEV,

        winerror.ERROR_BAD_DRIVER_LEVEL: errno.ENXIO,

        winerror.ERROR_BAD_EXE_FORMAT: errno.ENOEXEC,

        winerror.ERROR_BAD_FORMAT: errno.ENOEXEC,

        winerror.ERROR_BAD_LENGTH: errno.EINVAL,

        winerror.ERROR_BAD_PATHNAME: errno.ENOENT,

        winerror.ERROR_BAD_PIPE: errno.EPIPE,

        winerror.ERROR_BAD_UNIT: errno.ENODEV,

        winerror.ERROR_BAD_USERNAME: errno.EINVAL,

        winerror.ERROR_BROKEN_PIPE: errno.EPIPE,

        winerror.ERROR_BUFFER_OVERFLOW: errno.ENAMETOOLONG,

        winerror.ERROR_BUSY: errno.EBUSY,

        winerror.ERROR_BUSY_DRIVE: errno.EBUSY,

        winerror.ERROR_CALL_NOT_IMPLEMENTED: errno.ENOSYS,

        winerror.ERROR_CANNOT_MAKE: errno.EACCES,

        winerror.ERROR_CANTOPEN: errno.EIO,

        winerror.ERROR_CANTREAD: errno.EIO,

        winerror.ERROR_CANTWRITE: errno.EIO,

        winerror.ERROR_CRC: errno.EIO,

        winerror.ERROR_CURRENT_DIRECTORY: errno.EACCES,

        winerror.ERROR_DEVICE_IN_USE: errno.EBUSY,

        winerror.ERROR_DEV_NOT_EXIST: errno.ENODEV,

        winerror.ERROR_DIRECTORY: errno.EINVAL,

        winerror.ERROR_DIR_NOT_EMPTY: errno.ENOTEMPTY,

        winerror.ERROR_DISK_CHANGE: errno.EIO,

        winerror.ERROR_DISK_FULL: errno.ENOSPC,

        winerror.ERROR_DRIVE_LOCKED: errno.EBUSY,

        winerror.ERROR_ENVVAR_NOT_FOUND: errno.EINVAL,

        winerror.ERROR_EXE_MARKED_INVALID: errno.ENOEXEC,

        winerror.ERROR_FILENAME_EXCED_RANGE: errno.ENAMETOOLONG,

        winerror.ERROR_FILE_EXISTS: errno.EEXIST,

        winerror.ERROR_FILE_INVALID: errno.ENODEV,

        winerror.ERROR_FILE_NOT_FOUND: errno.ENOENT,

        winerror.ERROR_GEN_FAILURE: errno.EIO,

        winerror.ERROR_HANDLE_DISK_FULL: errno.ENOSPC,

        winerror.ERROR_INSUFFICIENT_BUFFER: errno.ENOMEM,

        winerror.ERROR_INVALID_ACCESS: errno.EACCES,

        winerror.ERROR_INVALID_ADDRESS: errno.EFAULT,

        winerror.ERROR_INVALID_BLOCK: errno.EFAULT,

        winerror.ERROR_INVALID_DATA: errno.EINVAL,

        winerror.ERROR_INVALID_DRIVE: errno.ENODEV,

        winerror.ERROR_INVALID_EXE_SIGNATURE: errno.ENOEXEC,

        winerror.ERROR_INVALID_FLAGS: errno.EINVAL,

        winerror.ERROR_INVALID_FUNCTION: errno.ENOSYS,

        winerror.ERROR_INVALID_HANDLE: errno.EBADF,

        winerror.ERROR_INVALID_LOGON_HOURS: errno.EACCES,

        winerror.ERROR_INVALID_NAME: errno.EINVAL,

        winerror.ERROR_INVALID_OWNER: errno.EINVAL,

        winerror.ERROR_INVALID_PARAMETER: errno.EINVAL,

        winerror.ERROR_INVALID_PASSWORD: errno.EPERM,

        winerror.ERROR_INVALID_PRIMARY_GROUP: errno.EINVAL,

        winerror.ERROR_INVALID_SIGNAL_NUMBER: errno.EINVAL,

        winerror.ERROR_INVALID_TARGET_HANDLE: errno.EIO,

        winerror.ERROR_INVALID_WORKSTATION: errno.EACCES,

        winerror.ERROR_IO_DEVICE: errno.EIO,

        winerror.ERROR_IO_INCOMPLETE: errno.EINTR,

        winerror.ERROR_LOCKED: errno.EBUSY,

        winerror.ERROR_LOCK_VIOLATION: errno.EACCES,

        winerror.ERROR_LOGON_FAILURE: errno.EACCES,

        winerror.ERROR_MAPPED_ALIGNMENT: errno.EINVAL,

        winerror.ERROR_META_EXPANSION_TOO_LONG: errno.E2BIG,

        winerror.ERROR_MORE_DATA: errno.EPIPE,

        winerror.ERROR_NEGATIVE_SEEK: errno.ESPIPE,

        winerror.ERROR_NOACCESS: errno.EFAULT,

        winerror.ERROR_NONE_MAPPED: errno.EINVAL,

        winerror.ERROR_NOT_ENOUGH_MEMORY: errno.ENOMEM,

        winerror.ERROR_NOT_READY: errno.EAGAIN,

        winerror.ERROR_NOT_SAME_DEVICE: errno.EXDEV,

        winerror.ERROR_NO_DATA: errno.EPIPE,

        winerror.ERROR_NO_MORE_SEARCH_HANDLES: errno.EIO,

        winerror.ERROR_NO_PROC_SLOTS: errno.EAGAIN,

        winerror.ERROR_NO_SUCH_PRIVILEGE: errno.EACCES,

        winerror.ERROR_OPEN_FAILED: errno.EIO,

        winerror.ERROR_OPEN_FILES: errno.EBUSY,

        winerror.ERROR_OPERATION_ABORTED: errno.EINTR,

        winerror.ERROR_OUTOFMEMORY: errno.ENOMEM,

        winerror.ERROR_PASSWORD_EXPIRED: errno.EACCES,

        winerror.ERROR_PATH_BUSY: errno.EBUSY,

        winerror.ERROR_PATH_NOT_FOUND: errno.ENOENT,

        winerror.ERROR_PIPE_BUSY: errno.EBUSY,

        winerror.ERROR_PIPE_CONNECTED: errno.EPIPE,

        winerror.ERROR_PIPE_LISTENING: errno.EPIPE,

        winerror.ERROR_PIPE_NOT_CONNECTED: errno.EPIPE,

        winerror.ERROR_PRIVILEGE_NOT_HELD: errno.EACCES,

        winerror.ERROR_READ_FAULT: errno.EIO,

        winerror.ERROR_SEEK: errno.EIO,

        winerror.ERROR_SEEK_ON_DEVICE: errno.ESPIPE,

        winerror.ERROR_SHARING_BUFFER_EXCEEDED: errno.ENFILE,

        winerror.ERROR_SHARING_VIOLATION: errno.EACCES,

        winerror.ERROR_STACK_OVERFLOW: errno.ENOMEM,

        winerror.ERROR_SWAPERROR: errno.ENOENT,

        winerror.ERROR_TOO_MANY_MODULES: errno.EMFILE,

        winerror.ERROR_TOO_MANY_OPEN_FILES: errno.EMFILE,

        winerror.ERROR_UNRECOGNIZED_MEDIA: errno.ENXIO,

        winerror.ERROR_UNRECOGNIZED_VOLUME: errno.ENODEV,

        winerror.ERROR_WAIT_NO_CHILDREN: errno.ECHILD,

        winerror.ERROR_WRITE_FAULT: errno.EIO,

        winerror.ERROR_WRITE_PROTECT: errno.EROFS,

        }

    def __init__(self, err):

        self.win_errno, self.win_function, self.win_strerror = err

        if self.win_strerror.endswith('.'):

            self.win_strerror = self.win_strerror[:-1]

class WinIOError(WinError, IOError):

    def __init__(self, err, filename=None):

        WinError.__init__(self, err)

        IOError.__init__(self, self.winerror_map.get(self.win_errno, 0),

                         self.win_strerror)

        self.filename = filename

class WinOSError(WinError, OSError):

    def __init__(self, err):

        WinError.__init__(self, err)

        OSError.__init__(self, self.winerror_map.get(self.win_errno, 0),

                         self.win_strerror)

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 WinOSError((18, 'CreateHardLink', 'The system cannot '

                              'move the file to a different disk drive'))

    except pywintypes.error, details:

        raise WinOSError(details)

    except NotImplementedError: # Another fake error win Win98

        raise WinOSError((18, 'CreateHardLink', 'Hardlinking not supported'))

def nlinks(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)

        res = win32file.GetFileInformationByHandle(fh)

        fh.Close()

        return res[7]

    except pywintypes.error:

        return os.lstat(pathname).st_nlink

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]

    # 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')]

class posixfile_nt(object):

    '''file object with posix-like semantics.  on windows, normal

    files can not be deleted or renamed if they are open. must open

    with win32file.FILE_SHARE_DELETE. this flag does not exist on

    windows < nt, so do not use this class there.'''

    # tried to use win32file._open_osfhandle to pass fd to os.fdopen,

    # but does not work at all. wrap win32 file api instead.

    def __init__(self, name, mode='rb'):

        self.closed = False

        self.name = name

        self.mode = mode

        access = 0

        if 'r' in mode or '+' in mode:

            access |= win32file.GENERIC_READ

        if 'w' in mode or 'a' in mode or '+' in mode:

            access |= win32file.GENERIC_WRITE

        if 'r' in mode:

            creation = win32file.OPEN_EXISTING

        elif 'a' in mode:

            creation = win32file.OPEN_ALWAYS

        else:

            creation = win32file.CREATE_ALWAYS

        try:

            self.handle = win32file.CreateFile(name,

                                               access,

                                               win32file.FILE_SHARE_READ |

                                               win32file.FILE_SHARE_WRITE |

                                               win32file.FILE_SHARE_DELETE,

                                               None,

                                               creation,

                                               win32file.FILE_ATTRIBUTE_NORMAL,

                                               0)

        except pywintypes.error, err:

            raise WinIOError(err, name)

    def __iter__(self):

        for line in self.readlines():

            yield line

    def read(self, count=-1):

        try:

            cs = cStringIO.StringIO()

            while count:

                wincount = int(count)

                if wincount == -1:

                    wincount = 1048576

                val, data = win32file.ReadFile(self.handle, wincount)

                if not data: break

                cs.write(data)

                if count != -1:

                    count -= len(data)

            return cs.getvalue()

        except pywintypes.error, err:

            raise WinIOError(err)

    def readlines(self, sizehint=None):

        # splitlines() splits on single '\r' while readlines()

        # does not. cStringIO has a well behaving readlines() and is fast.

        return cStringIO.StringIO(self.read()).readlines()

    def write(self, data):

        try:

            if 'a' in self.mode:

                win32file.SetFilePointer(self.handle, 0, win32file.FILE_END)

            nwrit = 0

            while nwrit < len(data):

                val, nwrit = win32file.WriteFile(self.handle, data)

                data = data[nwrit:]

        except pywintypes.error, err:

            raise WinIOError(err)

    def writelines(self, sequence):

        for s in sequence:

            self.write(s)

    def seek(self, pos, whence=0):

        try:

            win32file.SetFilePointer(self.handle, int(pos), whence)

        except pywintypes.error, err:

            raise WinIOError(err)

    def tell(self):

        try:

            return win32file.SetFilePointer(self.handle, 0,

                                            win32file.FILE_CURRENT)

        except pywintypes.error, err:

            raise WinIOError(err)

    def close(self):

        if not self.closed:

            self.handle = None

            self.closed = True

    def flush(self):

        # we have no application-level buffering

        pass

    def truncate(self, pos=0):

        try:

            win32file.SetFilePointer(self.handle, int(pos),

                                     win32file.FILE_BEGIN)

            win32file.SetEndOfFile(self.handle)

        except pywintypes.error, err:

            raise WinIOError(err)

def getuser():

    '''return name of current user'''

    return win32api.GetUserName()