added duplicate,reverse,join

extensions/fablabchemnitz/duplicate_reverse_join/duplicate_reverse_join.inx

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<inkscape-extension xmlns="http://www.inkscape.org/namespace/inkscape/extension">
+    <name>Duplicate + Reverse + Join</name>
+    <id>fablabchemnitz.de.duplicate_reverse_join</id>
+    <effect>
+        <effects-menu>
+         <submenu name="FabLab Chemnitz">
+            <submenu name="Modify existing Path(s)"/>
+         </submenu>
+        </effects-menu>
+    </effect>
+    <script>
+        <command location="inx" interpreter="python">duplicate_reverse_join.py</command>
+    </script>
+</inkscape-extension>

extensions/fablabchemnitz/duplicate_reverse_join/duplicate_reverse_join.py

@@ -0,0 +1,63 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2020 Ellen Wasboe, ellen@wasbo.net
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+"""
+Duplicate subpaths of all selected paths, reverse and join end nodes.
+"""
+
+import inkex
+
+class DuplicateReverseJoin(inkex.EffectExtension):
+		
+	def effect(self):
+		for elem in self.svg.selection:
+			
+			pp=elem.path.to_absolute()
+			dList=str(pp).split(' M')
+			dFinal=''
+			l=0
+			for sub in dList:
+				if l>0:
+					origSub='M'+dList[l]
+				else:
+					origSub=dList[l]
+				
+				elem.path=origSub
+				reSub=elem.path.reverse()
+				
+				if l>0:
+					origSub=' '+origSub
+					
+				if origSub.find('Z') > -1:
+					dRev=str(reSub).split(' ')
+					strRev=''
+					if dRev[3]=='L' and dRev[1]==dRev[4] and dRev[2]==dRev[5]:
+						strRev=' '.join(dRev[0:3])+' '+' '.join(dRev[6:]) #avoid that reverse path duplicate first node
+					else:
+						strRev=' '.join(dRev)
+					dFinal=dFinal+origSub+' '+strRev #keep original and reverse as separate closed paths
+					if dRev[-1]!='Z':
+						dFinal=dFinal+' Z'#avoid that reverse of closed path is open
+				else:
+					dRev=str(reSub).split(' ')
+					dFinal=dFinal+origSub+' '+' '.join(dRev[3:])+' Z' #pop off M element of reverse path and add Z to close
+				l+=1
+			elem.path=dFinal
+		
+				
+if __name__ == '__main__':
+    DuplicateReverseJoin().run()

extensions/fablabchemnitz/duplicate_reverse_join/meta.json

@@ -0,0 +1,20 @@
+[
+  {
+    "name": "Duplicate + Reverse + Join",
+    "id": "fablabchemnitz.de.duplicate_reverse_join",
+    "path": "duplicate_reverse_join",
+    "original_name": "Duplicate, reverse, join",
+    "original_id": "EllenWasbo.cutlings.duplicateReverseJoin",
+    "license": "GNU GPL v2",
+    "license_url": "https://gitlab.com/EllenWasbo/inkscape-extension-duplicatereversejoin/-/blob/master/duplicateReverseJoin.py",
+    "comment": "",
+    "source_url": "https://gitea.fablabchemnitz.de/FabLab_Chemnitz/mightyscape-1.X/src/branch/master/extensions/fablabchemnitz/duplicate_reverse_joi",
+    "fork_url": "https://gitlab.com/EllenWasbo/inkscape-extension-duplicatereversejoin",
+    "documentation_url": "https://stadtfabrikanten.org/pages/viewpage.action?pageId=120525059",
+    "inkscape_gallery_url": null,
+    "main_authors": [
+      "gitlab.com/EllenWasbo",
+      "github.com/vmario89"
+    ]
+  }
+]