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# SPDX-License-Identifier: LGPL-2.1-or-later

# -*- coding: utf8 -*-
## @package importDWG
#  \ingroup DRAFT
#  \brief DWG file importer & exporter
"""
@package importDWG
ingroup DRAFT
\brief DWG file importer & exporter
This module provides support for importing and exporting Autodesk DWG files.
This module is only a thin layer that uses the ODA (formerly Teigha) File
Converter application to convert to/from DXF. Then the real work is done by
importDXF
Test files
https://knowledge.autodesk.com/support/autocad/downloads/
    caas/downloads/content/autocad-sample-files.html
"""
# Check code quality with
# flake8 --ignore=E226,E266,E401,W503

# ***************************************************************************
# *   Copyright (c) 2009 Yorik van Havre <yorik@uncreated.net>              *
# *                                                                         *
# *   This program is free software; you can redistribute it and/or modify  *
# *   it under the terms of the GNU Lesser General Public License (LGPL)    *
# *   as published by the Free Software Foundation; either version 2 of     *
# *   the License, or (at your option) any later version.                   *
# *   for detail see the LICENCE text file.                                 *
# *                                                                         *
# *   This program is distributed in the hope that it will be useful,       *
# *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
# *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
# *   GNU Library General Public License for more details.                  *
# *                                                                         *
# *   You should have received a copy of the GNU Library General Public     *
# *   License along with this program; if not, write to the Free Software   *
# *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  *
# *   USA                                                                   *
# *                                                                         *
# ***************************************************************************

import FreeCAD
from FreeCAD import Console as FCC
from draftutils import params

if FreeCAD.GuiUp:
    from draftutils.translate import translate
else:

    def translate(context, txt):
        return txt


def open(filename):
    """Open filename and parse using importDXF.open().
    Parameters
    ----------
    filename : str
        The path to the filename to be opened.
    Returns
    -------
    App::Document
        The new FreeCAD document object created, with the parsed information.
    """
    dxf = convertToDxf(filename)
    if dxf:
        import importDXF

        doc = importDXF.open(dxf)
        return doc
    return


def insert(filename, docname):
    """Imports a file using importDXF.insert().
    If no document exist, it is created.
    Parameters
    ----------
    filename : str
        The path to the filename to be opened.
    docname : str
        The name of the active App::Document if one exists, or
        of the new one created.
    Returns
    -------
    App::Document
        The active FreeCAD document, or the document created if none exists,
        with the parsed information.
    """
    dxf = convertToDxf(filename)
    if dxf:
        import importDXF

        # Warning: function doesn't return?
        doc = importDXF.insert(dxf, docname)
        return doc
    return


def export(objectslist, filename):
    """Export the DWG file with a given list of objects.
    The objects are exported with importDXF.export().
    Then the result is converted to DWG.
    Parameters
    ----------
    exportList : list
        List of document objects to export.
    filename : str
        Path to the new file.
    Returns
    -------
    str
        The same `filename` input.
    """
    import importDXF
    import os
    import tempfile

    outdir = tempfile.mkdtemp()
    _basename = os.path.splitext(os.path.basename(filename))[0]
    dxf = outdir + os.sep + _basename + ".dxf"
    importDXF.export(objectslist, dxf)
    convertToDwg(dxf, filename)
    return filename


def get_libredwg_converter(typ):
    """Find the LibreDWG converter.
    It searches the FreeCAD parameters database, then searches the OS search path.
    There are no standard installation paths.
    `typ` is required because LibreDWG uses two converters and we store only one.
    Parameters
    ----------
    typ : str
        "dwg2dxf" or "dxf2dwg".
    Returns
    -------
    str
        The full path of the converter.
    """
    import os
    import platform

    path = params.get_param("TeighaFileConverter")

    if "dwg2dxf" in path or "dxf2dwg" in path:  # path set manually
        if typ not in path:
            path = os.path.dirname(path) + "/" + typ + os.path.splitext(path)[1]
        if os.path.exists(path) and os.path.isfile(path):
            return path
    elif platform.system() == "Windows":
        for sub in os.getenv("PATH").split(os.pathsep):
            path = sub.replace("\\", "/") + "/" + typ + ".exe"
            if os.path.exists(path) and os.path.isfile(path):
                return path
    else:  # for Linux and macOS
        for sub in os.getenv("PATH").split(os.pathsep):
            path = sub + "/" + typ
            if os.path.exists(path) and os.path.isfile(path):
                return path

    return None


def get_oda_converter():
    """Find the ODA converter.
    It searches the FreeCAD parameters database, then searches for common paths.
    Parameters
    ----------
    None
    Returns
    -------
    str
        The full path of the converter.
    """
    import os
    import platform

    path = params.get_param("TeighaFileConverter")

    if "ODAFileConverter" in path:  # path set manually
        if os.path.exists(path) and os.path.isfile(path):
            return path
    elif platform.system() == "Windows":
        odadir = os.path.expandvars("%ProgramFiles%\\ODA").replace("\\", "/")
        if os.path.exists(odadir):
            for sub in os.listdir(odadir):
                path = odadir + "/" + sub + "/" + "ODAFileConverter.exe"
                if os.path.exists(path) and os.path.isfile(path):
                    return path
    elif platform.system() == "Linux":
        path = "/usr/bin/ODAFileConverter"
        if os.path.exists(path) and os.path.isfile(path):
            return path
    else:  # for macOS
        path = "/Applications/ODAFileConverter.app/Contents/MacOS/ODAFileConverter"
        if os.path.exists(path) and os.path.isfile(path):
            return path

    return None


def get_qcad_converter():
    """Find the QCAD converter.
    It searches the FreeCAD parameters database, then searches for common paths.
    Parameters
    ----------
    None
    Returns
    -------
    str
        The full path of the converter.
    """
    import os
    import platform

    path = params.get_param("TeighaFileConverter")

    if "dwg2dwg" in path:  # path set manually
        pass
    elif platform.system() == "Windows":
        path = os.path.expandvars("%ProgramFiles%\\QCAD\\dwg2dwg.bat").replace("\\", "/")
    elif platform.system() == "Linux":
        # /home/$USER/opt/qcad-3.28.1-trial-linux-qt5.14-x86_64/dwg2dwg
        path = os.path.expandvars("/home/$USER/opt")
        if os.path.exists(path) and os.path.isdir(path):
            for sub in os.listdir(path):
                if "qcad" in sub:
                    path = path + "/" + sub + "/" + "dwg2dwg"
                    break
    else:  # for macOS
        path = "/Applications/QCAD.app/Contents/Resources/dwg2dwg"

    if os.path.exists(path) and os.path.isfile(path):
        return path
    return None


def convertToDxf(dwgfilename):
    """Convert a DWG file to a DXF file.
    If the converter is found it is used, otherwise the conversion fails.
    Parameters
    ----------
    dwgfilename : str
        The input filename.
    Returns
    -------
    str
        The new file produced.
    """
    import os
    import subprocess
    import tempfile

    dwgfilename = dwgfilename.replace("\\", "/")
    conv = params.get_param("DWGConversion")
    error_msg = (
        translate(
            "draft",
            """Error during DWG conversion.
Try moving the DWG file to a directory path without spaces and non-english characters,
or try saving to a lower DWG version.""",
        )
        + "\n"
    )

    if conv in [0, 1]:  # LibreDWG
        libredwg = get_libredwg_converter("dwg2dxf")
        if libredwg is not None:
            outdir = tempfile.mkdtemp().replace("\\", "/")
            basename = os.path.basename(dwgfilename)
            result = outdir + "/" + os.path.splitext(basename)[0] + ".dxf"
            cmdline = [libredwg, dwgfilename, "-o", result]
            FCC.PrintMessage(translate("draft", "Converting:") + " " + str(cmdline) + "\n")
            proc = subprocess.Popen(cmdline)
            proc.communicate()
            if os.path.exists(result):
                FCC.PrintMessage(translate("draft", "Conversion successful") + "\n")
                return result
            else:
                FCC.PrintError(error_msg)
        elif conv != 0:
            FCC.PrintError(translate("draft", "LibreDWG converter not found") + "\n")

    if conv in [0, 2]:  # ODA
        oda = get_oda_converter()
        if oda is not None:
            indir = os.path.dirname(dwgfilename)
            outdir = tempfile.mkdtemp().replace("\\", "/")
            basename = os.path.basename(dwgfilename)
            cmdline = [oda, indir, outdir, "ACAD2000", "DXF", "0", "1", basename]
            FCC.PrintMessage(translate("draft", "Converting:") + " " + str(cmdline) + "\n")
            proc = subprocess.Popen(cmdline)
            proc.communicate()
            result = outdir + "/" + os.path.splitext(basename)[0] + ".dxf"
            if os.path.exists(result):
                FCC.PrintMessage(translate("draft", "Conversion successful") + "\n")
                return result
            else:
                FCC.PrintError(error_msg)
        elif conv != 0:
            FCC.PrintError(translate("draft", "ODA converter not found") + "\n")

    if conv in [0, 3]:  # QCAD
        qcad = get_qcad_converter()
        if qcad is not None:
            outdir = tempfile.mkdtemp().replace("\\", "/")
            basename = os.path.basename(dwgfilename)
            result = outdir + "/" + os.path.splitext(basename)[0] + ".dxf"
            cmdline = [qcad, "-f", "-o", result, dwgfilename]
            FCC.PrintMessage(translate("draft", "Converting:") + " " + str(cmdline) + "\n")
            proc = subprocess.Popen(cmdline, cwd=os.path.dirname(qcad))  # cwd required for Windows
            proc.communicate()
            if os.path.exists(result):
                FCC.PrintMessage(translate("draft", "Conversion successful") + "\n")
                return result
            else:
                FCC.PrintError(error_msg)
        elif conv != 0:
            FCC.PrintError(translate("draft", "QCAD converter not found") + "\n")

    FCC.PrintError(
        translate(
            "draft",
            """No suitable external DWG converter has been found.
Please set one manually under menu Edit → Preferences → Import/Export → DWG
For more information see:
https://wiki.freecad.org/Import_Export_Preferences""",
        )
        + "\n"
    )
    return None


def convertToDwg(dxffilename, dwgfilename):
    """Convert a DXF file to a DWG file.
    If the converter is found it is used, otherwise the conversion fails.
    Parameters
    ----------
    dxffilename : str
        The input DXF file
    dwgfilename : str
        The output DWG file
    Returns
    -------
    str
        The same `dwgfilename` file path.
    """
    import os
    import subprocess

    dxffilename = dxffilename.replace("\\", "/")
    dwgfilename = dwgfilename.replace("\\", "/")
    conv = params.get_param("DWGConversion")

    if conv in [0, 1]:  # LibreDWG
        libredwg = get_libredwg_converter("dxf2dwg")
        if libredwg is not None:
            cmdline = [libredwg, dxffilename, "-y", "-o", dwgfilename]
            FCC.PrintMessage(translate("draft", "Converting:") + " " + str(cmdline) + "\n")
            proc = subprocess.Popen(cmdline)
            proc.communicate()
            return dwgfilename
        elif conv != 0:
            FCC.PrintError(translate("draft", "LibreDWG converter not found") + "\n")

    if conv in [0, 2]:  # ODA
        oda = get_oda_converter()
        if oda is not None:
            indir = os.path.dirname(dxffilename)
            outdir = os.path.dirname(dwgfilename)
            basename = os.path.basename(dxffilename)
            cmdline = [oda, indir, outdir, "ACAD2000", "DWG", "0", "1", basename]
            FCC.PrintMessage(translate("draft", "Converting:") + " " + str(cmdline) + "\n")
            proc = subprocess.Popen(cmdline)
            proc.communicate()
            return dwgfilename
        elif conv != 0:
            FCC.PrintError(translate("draft", "ODA converter not found") + "\n")

    if conv in [0, 3]:  # QCAD
        qcad = get_qcad_converter()
        if qcad is not None:
            cmdline = [qcad, "-f", "-o", dwgfilename, dxffilename]
            FCC.PrintMessage(translate("draft", "Converting:") + " " + str(cmdline) + "\n")
            proc = subprocess.Popen(cmdline, cwd=os.path.dirname(qcad))  # cwd required for Windows
            proc.communicate()
            return dwgfilename
        elif conv != 0:
            FCC.PrintError(translate("draft", "QCAD converter not found") + "\n")

    FCC.PrintError(
        translate(
            "draft",
            """No suitable external DWG converter has been found.
Please set one manually under menu Edit → Preferences → Import/Export → DWG
For more information see:
https://wiki.freecad.org/Import_Export_Preferences""",
        )
        + "\n"
    )
    return None

	# SPDX-License-Identifier: LGPL-2.1-or-later

	# -- coding: utf8 --
	## @package importDWG
	# \ingroup DRAFT
	# \brief DWG file importer & exporter
	"""
	@package importDWG
	ingroup DRAFT
	\brief DWG file importer & exporter

	This module provides support for importing and exporting Autodesk DWG files.
	This module is only a thin layer that uses the ODA (formerly Teigha) File
	Converter application to convert to/from DXF. Then the real work is done by
	importDXF

	Test files
	https://knowledge.autodesk.com/support/autocad/downloads/
	caas/downloads/content/autocad-sample-files.html
	"""
	# Check code quality with
	# flake8 --ignore=E226,E266,E401,W503

	# ***************************************************************************
	# * Copyright (c) 2009 Yorik van Havre <yorik@uncreated.net> *
	# * *
	# * This program is free software; you can redistribute it and/or modify *
	# * it under the terms of the GNU Lesser General Public License (LGPL) *
	# * as published by the Free Software Foundation; either version 2 of *
	# * the License, or (at your option) any later version. *
	# * for detail see the LICENCE text file. *
	# * *
	# * This program is distributed in the hope that it will be useful, *
	# * but WITHOUT ANY WARRANTY; without even the implied warranty of *
	# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
	# * GNU Library General Public License for more details. *
	# * *
	# * You should have received a copy of the GNU Library General Public *
	# * License along with this program; if not, write to the Free Software *
	# * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
	# * USA *
	# * *
	# ***************************************************************************

	import FreeCAD
	from FreeCAD import Console as FCC
	from draftutils import params

	if FreeCAD.GuiUp:
	from draftutils.translate import translate
	else:

	def translate(context, txt):
	return txt


	def open(filename):
	"""Open filename and parse using importDXF.open().

	Parameters
	----------
	filename : str
	The path to the filename to be opened.

	Returns
	-------
	App::Document
	The new FreeCAD document object created, with the parsed information.
	"""
	dxf = convertToDxf(filename)
	if dxf:
	import importDXF

	doc = importDXF.open(dxf)
	return doc
	return


	def insert(filename, docname):
	"""Imports a file using importDXF.insert().

	If no document exist, it is created.

	Parameters
	----------
	filename : str
	The path to the filename to be opened.
	docname : str
	The name of the active App::Document if one exists, or
	of the new one created.

	Returns
	-------
	App::Document
	The active FreeCAD document, or the document created if none exists,
	with the parsed information.
	"""
	dxf = convertToDxf(filename)
	if dxf:
	import importDXF

	# Warning: function doesn't return?
	doc = importDXF.insert(dxf, docname)
	return doc
	return


	def export(objectslist, filename):
	"""Export the DWG file with a given list of objects.

	The objects are exported with importDXF.export().
	Then the result is converted to DWG.

	Parameters
	----------
	exportList : list
	List of document objects to export.
	filename : str
	Path to the new file.

	Returns
	-------
	str
	The same `filename` input.
	"""
	import importDXF
	import os
	import tempfile

	outdir = tempfile.mkdtemp()
	_basename = os.path.splitext(os.path.basename(filename))[0]
	dxf = outdir + os.sep + _basename + ".dxf"
	importDXF.export(objectslist, dxf)
	convertToDwg(dxf, filename)
	return filename


	def get_libredwg_converter(typ):
	"""Find the LibreDWG converter.

	It searches the FreeCAD parameters database, then searches the OS search path.
	There are no standard installation paths.

	`typ` is required because LibreDWG uses two converters and we store only one.

	Parameters
	----------
	typ : str
	"dwg2dxf" or "dxf2dwg".

	Returns
	-------
	str
	The full path of the converter.
	"""
	import os
	import platform

	path = params.get_param("TeighaFileConverter")

	if "dwg2dxf" in path or "dxf2dwg" in path: # path set manually
	if typ not in path:
	path = os.path.dirname(path) + "/" + typ + os.path.splitext(path)[1]
	if os.path.exists(path) and os.path.isfile(path):
	return path
	elif platform.system() == "Windows":
	for sub in os.getenv("PATH").split(os.pathsep):
	path = sub.replace("\\", "/") + "/" + typ + ".exe"
	if os.path.exists(path) and os.path.isfile(path):
	return path
	else: # for Linux and macOS
	for sub in os.getenv("PATH").split(os.pathsep):
	path = sub + "/" + typ
	if os.path.exists(path) and os.path.isfile(path):
	return path

	return None


	def get_oda_converter():
	"""Find the ODA converter.

	It searches the FreeCAD parameters database, then searches for common paths.

	Parameters
	----------
	None

	Returns
	-------
	str
	The full path of the converter.
	"""
	import os
	import platform

	path = params.get_param("TeighaFileConverter")

	if "ODAFileConverter" in path: # path set manually
	if os.path.exists(path) and os.path.isfile(path):
	return path
	elif platform.system() == "Windows":
	odadir = os.path.expandvars("%ProgramFiles%\\ODA").replace("\\", "/")
	if os.path.exists(odadir):
	for sub in os.listdir(odadir):
	path = odadir + "/" + sub + "/" + "ODAFileConverter.exe"
	if os.path.exists(path) and os.path.isfile(path):
	return path
	elif platform.system() == "Linux":
	path = "/usr/bin/ODAFileConverter"
	if os.path.exists(path) and os.path.isfile(path):
	return path
	else: # for macOS
	path = "/Applications/ODAFileConverter.app/Contents/MacOS/ODAFileConverter"
	if os.path.exists(path) and os.path.isfile(path):
	return path

	return None


	def get_qcad_converter():
	"""Find the QCAD converter.

	It searches the FreeCAD parameters database, then searches for common paths.

	Parameters
	----------
	None

	Returns
	-------
	str
	The full path of the converter.
	"""
	import os
	import platform

	path = params.get_param("TeighaFileConverter")

	if "dwg2dwg" in path: # path set manually
	pass
	elif platform.system() == "Windows":
	path = os.path.expandvars("%ProgramFiles%\\QCAD\\dwg2dwg.bat").replace("\\", "/")
	elif platform.system() == "Linux":
	# /home/$USER/opt/qcad-3.28.1-trial-linux-qt5.14-x86_64/dwg2dwg
	path = os.path.expandvars("/home/$USER/opt")
	if os.path.exists(path) and os.path.isdir(path):
	for sub in os.listdir(path):
	if "qcad" in sub:
	path = path + "/" + sub + "/" + "dwg2dwg"
	break
	else: # for macOS
	path = "/Applications/QCAD.app/Contents/Resources/dwg2dwg"

	if os.path.exists(path) and os.path.isfile(path):
	return path
	return None


	def convertToDxf(dwgfilename):
	"""Convert a DWG file to a DXF file.

	If the converter is found it is used, otherwise the conversion fails.

	Parameters
	----------
	dwgfilename : str
	The input filename.

	Returns
	-------
	str
	The new file produced.
	"""
	import os
	import subprocess
	import tempfile

	dwgfilename = dwgfilename.replace("\\", "/")
	conv = params.get_param("DWGConversion")
	error_msg = (
	translate(
	"draft",
	"""Error during DWG conversion.
	Try moving the DWG file to a directory path without spaces and non-english characters,
	or try saving to a lower DWG version.""",
	)
	+ "\n"
	)

	if conv in [0, 1]: # LibreDWG
	libredwg = get_libredwg_converter("dwg2dxf")
	if libredwg is not None:
	outdir = tempfile.mkdtemp().replace("\\", "/")
	basename = os.path.basename(dwgfilename)
	result = outdir + "/" + os.path.splitext(basename)[0] + ".dxf"
	cmdline = [libredwg, dwgfilename, "-o", result]
	FCC.PrintMessage(translate("draft", "Converting:") + " " + str(cmdline) + "\n")
	proc = subprocess.Popen(cmdline)
	proc.communicate()
	if os.path.exists(result):
	FCC.PrintMessage(translate("draft", "Conversion successful") + "\n")
	return result
	else:
	FCC.PrintError(error_msg)
	elif conv != 0:
	FCC.PrintError(translate("draft", "LibreDWG converter not found") + "\n")

	if conv in [0, 2]: # ODA
	oda = get_oda_converter()
	if oda is not None:
	indir = os.path.dirname(dwgfilename)
	outdir = tempfile.mkdtemp().replace("\\", "/")
	basename = os.path.basename(dwgfilename)
	cmdline = [oda, indir, outdir, "ACAD2000", "DXF", "0", "1", basename]
	FCC.PrintMessage(translate("draft", "Converting:") + " " + str(cmdline) + "\n")
	proc = subprocess.Popen(cmdline)
	proc.communicate()
	result = outdir + "/" + os.path.splitext(basename)[0] + ".dxf"
	if os.path.exists(result):
	FCC.PrintMessage(translate("draft", "Conversion successful") + "\n")
	return result
	else:
	FCC.PrintError(error_msg)
	elif conv != 0:
	FCC.PrintError(translate("draft", "ODA converter not found") + "\n")

	if conv in [0, 3]: # QCAD
	qcad = get_qcad_converter()
	if qcad is not None:
	outdir = tempfile.mkdtemp().replace("\\", "/")
	basename = os.path.basename(dwgfilename)
	result = outdir + "/" + os.path.splitext(basename)[0] + ".dxf"
	cmdline = [qcad, "-f", "-o", result, dwgfilename]
	FCC.PrintMessage(translate("draft", "Converting:") + " " + str(cmdline) + "\n")
	proc = subprocess.Popen(cmdline, cwd=os.path.dirname(qcad)) # cwd required for Windows
	proc.communicate()
	if os.path.exists(result):
	FCC.PrintMessage(translate("draft", "Conversion successful") + "\n")
	return result
	else:
	FCC.PrintError(error_msg)
	elif conv != 0:
	FCC.PrintError(translate("draft", "QCAD converter not found") + "\n")

	FCC.PrintError(
	translate(
	"draft",
	"""No suitable external DWG converter has been found.
	Please set one manually under menu Edit → Preferences → Import/Export → DWG
	For more information see:
	https://wiki.freecad.org/Import_Export_Preferences""",
	)
	+ "\n"
	)
	return None


	def convertToDwg(dxffilename, dwgfilename):
	"""Convert a DXF file to a DWG file.

	If the converter is found it is used, otherwise the conversion fails.

	Parameters
	----------
	dxffilename : str
	The input DXF file
	dwgfilename : str
	The output DWG file

	Returns
	-------
	str
	The same `dwgfilename` file path.
	"""
	import os
	import subprocess

	dxffilename = dxffilename.replace("\\", "/")
	dwgfilename = dwgfilename.replace("\\", "/")
	conv = params.get_param("DWGConversion")

	if conv in [0, 1]: # LibreDWG
	libredwg = get_libredwg_converter("dxf2dwg")
	if libredwg is not None:
	cmdline = [libredwg, dxffilename, "-y", "-o", dwgfilename]
	FCC.PrintMessage(translate("draft", "Converting:") + " " + str(cmdline) + "\n")
	proc = subprocess.Popen(cmdline)
	proc.communicate()
	return dwgfilename
	elif conv != 0:
	FCC.PrintError(translate("draft", "LibreDWG converter not found") + "\n")

	if conv in [0, 2]: # ODA
	oda = get_oda_converter()
	if oda is not None:
	indir = os.path.dirname(dxffilename)
	outdir = os.path.dirname(dwgfilename)
	basename = os.path.basename(dxffilename)
	cmdline = [oda, indir, outdir, "ACAD2000", "DWG", "0", "1", basename]
	FCC.PrintMessage(translate("draft", "Converting:") + " " + str(cmdline) + "\n")
	proc = subprocess.Popen(cmdline)
	proc.communicate()
	return dwgfilename
	elif conv != 0:
	FCC.PrintError(translate("draft", "ODA converter not found") + "\n")

	if conv in [0, 3]: # QCAD
	qcad = get_qcad_converter()
	if qcad is not None:
	cmdline = [qcad, "-f", "-o", dwgfilename, dxffilename]
	FCC.PrintMessage(translate("draft", "Converting:") + " " + str(cmdline) + "\n")
	proc = subprocess.Popen(cmdline, cwd=os.path.dirname(qcad)) # cwd required for Windows
	proc.communicate()
	return dwgfilename
	elif conv != 0:
	FCC.PrintError(translate("draft", "QCAD converter not found") + "\n")

	FCC.PrintError(
	translate(
	"draft",
	"""No suitable external DWG converter has been found.
	Please set one manually under menu Edit → Preferences → Import/Export → DWG
	For more information see:
	https://wiki.freecad.org/Import_Export_Preferences""",
	)
	+ "\n"
	)
	return None