Draft: Preliminary DWG support

Using the teigha file converter. Warning, only working on linux
at the moment. See mantis issue 1103 to help me porting to other OSes

src/Mod/Draft/InitGui.py

@@ -162,3 +162,12 @@ App.addExportType("Autodesk DXF (*.dxf)","importDXF")
 App.addExportType("Flattened SVG (*.svg)","importSVG")
 App.addExportType("Open CAD Format (*.oca)","importOCA")
 
+# DWG support
+import importDWG
+if importDWG.getTeighaConvertor():
+    App.addImportType("Autodesk DWG (*.dwg)","importDWG") 
+    App.addExportType("Autodesk DWG (*.dwg)","importDWG")
+else:
+    from DraftTools import translate
+    FreeCAD.Console.PrintMessage(str(translate("draft","Teigha File Converter not found, DWG support will be disabled.\n")))
+

src/Mod/Draft/importDWG.py

@@ -0,0 +1,85 @@
+# -*- coding: utf8 -*-
+
+#***************************************************************************
+#*                                                                         *
+#*   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 (GPL)     *
+#*   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                                                                   *
+#*                                                                         *
+#***************************************************************************
+
+"FreeCAD Draft Workbench - DWG importer/exporter"
+
+if open.__module__ == '__builtin__':
+    pythonopen = open # to distinguish python built-in open function from the one declared here
+
+def open(filename):
+    "called when freecad opens a file."
+    teigha = getTeighaConvertor()
+    dxf = convertToDxf(filename)
+    import importDXF
+    doc = importDXF.open(dxf)
+    return doc
+
+def insert(filename,docname):
+    "called when freecad imports a file"
+    dxf = convertToDxf(filemname)
+    import importDXF
+    doc = importDXF.insert(dxf,docname)
+    return doc
+    
+def export(objectslist,filename):
+    "called when freecad exports a file"
+    import importDXF,os,tempfile
+    outdir = tempfile.mkdtemp()
+    dxf = outdir + os.sep + os.path.splitext(os.path.basename(filename))[0] + ".dxf"
+    importDXF.export(objectslist,dxf)
+    convertToDwg(dxf,filename)
+    return filename
+
+def getTeighaConvertor():
+    "finds the Teigha Convertor executable"
+    import os,platform
+    if platform.system() == "Linux":
+        teigha = "/usr/bin/TeighaFileConverter"
+    if os.path.exists(teigha):
+        return teigha
+    return None
+    
+def convertToDxf(dwgfilename):
+    "converts a DWG file to DXF"
+    import os,tempfile
+    teigha = getTeighaConvertor()
+    indir = os.path.dirname(dwgfilename)
+    outdir = tempfile.mkdtemp()
+    basename = os.path.basename(dwgfilename)
+    cmdline = teigha + ' "' + indir + '" "' + outdir + '" "ACAD2010" "DXF" "0" "1" "' + basename + '"'
+    print "converting " + cmdline
+    os.system(cmdline)
+    return outdir + os.sep + os.path.splitext(basename)[0] + ".dxf"
+    
+def convertToDwg(dxffilename,dwgfilename):
+    "converts a DXF file to DWG"
+    import os
+    teigha = getTeighaConvertor()
+    indir = os.path.dirname(dxffilename)
+    outdir = os.path.dirname(dwgfilename)
+    basename = os.path.basename(dxffilename)
+    cmdline = teigha + ' "' + indir + '" "' + outdir + '" "ACAD2010" "DWG" "0" "1" "' + basename + '"'
+    print "converting " + cmdline
+    os.system(cmdline)
+    return dwgfilename

src/WindowsInstaller/ModDraft.wxi

@@ -40,6 +40,7 @@
             <File Id="DraftRcPy" Name="Draft_rc.py" DiskId="1" />
             <File Id="DraftVecUtilsPy" Name="DraftVecUtils.py" DiskId="1" />
             <File Id="DraftGeomUtilsPy" Name="DraftGeomUtils.py" DiskId="1" />
+            <File Id="importDWGPy" Name="importDWG.py" DiskId="1" />
         </Component>
 		<Directory Id="ModDraftLib" Name="draftlibs" FileSource="../../Mod/Draft/draftlibs">
 	        <Component Id="CompModDraftLib" Guid="d19c08b0-0747-11de-8c30-0800200c9a66" Win64='$(var.Win_64)' KeyPath="yes">