From 84bdbd17aa259b6350d893d6800c52626f5f106c Mon Sep 17 00:00:00 2001
From: Mario Voigt <mariovoigt89@t-online.de>
Date: Thu, 20 Aug 2020 00:08:57 +0200
Subject: [PATCH] Added Colors to layers extension

---
 .../fablabchemnitz_colors_to_layers.inx       | 23 +++++
 extensions/fablabchemnitz_colors_to_layers.py | 86 +++++++++++++++++++
 2 files changed, 109 insertions(+)
 create mode 100644 extensions/fablabchemnitz_colors_to_layers.inx
 create mode 100644 extensions/fablabchemnitz_colors_to_layers.py

diff --git a/extensions/fablabchemnitz_colors_to_layers.inx b/extensions/fablabchemnitz_colors_to_layers.inx
new file mode 100644
index 00000000..e030f488
--- /dev/null
+++ b/extensions/fablabchemnitz_colors_to_layers.inx
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<inkscape-extension xmlns="http://www.inkscape.org/namespace/inkscape/extension">
+    <name>Colors To Layers</name>
+    <id>org.inkscape.color.colors_to_layers</id>
+    <param name="separateby" gui-text="Separate by" type="optiongroup" appearance="combo">
+       <option value="stroke">Stroke color</option>
+       <option value="fill">Fill color</option>
+    </param>
+    <label>This extension will re-layer your selected items or the whole document according to their color (stroke or fill)</label>
+    <label>Tinkererd by Mario Voigt / Stadtfabrikanten e.V. (2020)</label>
+    <label appearance="url">https://fablabchemnitz.de</label>
+    <effect>
+        <object-type>all</object-type>
+        <effects-menu>
+            <submenu name="FabLab Chemnitz">
+                <submenu name="Groups and Layers"/>
+            </submenu>
+        </effects-menu>
+    </effect>
+    <script>
+        <command location="inx" interpreter="python">fablabchemnitz_colors_to_layers.py</command>
+    </script>
+</inkscape-extension>
diff --git a/extensions/fablabchemnitz_colors_to_layers.py b/extensions/fablabchemnitz_colors_to_layers.py
new file mode 100644
index 00000000..69ccb52d
--- /dev/null
+++ b/extensions/fablabchemnitz_colors_to_layers.py
@@ -0,0 +1,86 @@
+#!/usr/bin/env python3
+
+"""
+Extension for InkScape 1.0
+Features
+ - filters the current selection or the whole document for fill or stroke style. Each style will be put onto it's own layer. This way you can devide elements by their colors.
+ 
+Author: Mario Voigt / FabLab Chemnitz
+Mail: mario.voigt@stadtfabrikanten.org
+Date: 19.08.2020
+Last patch: 19.08.2020
+License: GNU GPL v3
+"""
+
+import inkex
+import re
+from lxml import etree
+
+class LayerGroup(inkex.Effect):
+
+    def findLayer(self, layerName):
+        svg_layers = self.document.xpath('//svg:g[@inkscape:groupmode="layer"]', namespaces=inkex.NSS)
+        for layer in svg_layers:
+            #inkex.utils.debug(str(layer.get('inkscape:label')) + " == " + layerName)
+            if layer.get('inkscape:label') == layerName:
+                return layer
+        return None
+
+    def createLayer(self, layerNodeList, layerName):
+        svg = self.document.xpath('//svg:svg',namespaces=inkex.NSS)[0]
+        for layer in layerNodeList:
+            #inkex.utils.debug(str(layer[0].get('inkscape:label')) + " == " + layerName)
+            if layer[0].get('inkscape:label') == layerName:
+                return layer[0] #already exists. Do not create duplicate
+        layer = etree.SubElement(svg, 'g')
+        layer.set(inkex.addNS('label', 'inkscape'), '%s' % layerName)
+        layer.set(inkex.addNS('groupmode', 'inkscape'), 'layer')
+        return layer
+        
+    def __init__(self):
+        inkex.Effect.__init__(self)
+        self.arg_parser.add_argument("--separateby", default = "stroke", help = "Separate by")
+
+    def effect(self):
+   
+        layer_name = None
+        layerNodeList = [] #list with layer and node 
+        selected = [] #list of items to parse
+        
+        if len(self.svg.selected) == 0:
+            for element in self.document.getroot().iter("*"):
+                selected.append(element)
+        else:
+            selected = self.svg.selected.values()
+            
+        for element in selected:
+            style = element.get('style')
+            fill = element.get('fill') #if no style attribute or fill is set as extra attribute
+            stroke = element.get('stroke') #if no style attribute or stroke is set as extra attribute
+            if fill is not None or stroke is not None:
+                style = 'fill:'+ fill + ';stroke:' + stroke + ";"
+                
+            if style:
+                if self.options.separateby == "stroke":
+                    stroke = re.search('stroke:(.*?)(;|$)', style)
+                    if stroke is not None:
+                        stroke = stroke[0][8:-1]
+                        layer_name = "stroke-" + stroke
+                elif self.options.separateby == "fill":        
+                    fill = re.search('fill:(.*?)(;|$)', style)
+                    if fill is not None:
+                        fill = fill[0][6:-1]
+                        layer_name = "fill-" + fill
+
+                if layer_name is not None:
+                    currentLayer = self.findLayer(layer_name)    
+                    
+                    if currentLayer is None: #layer does not exist, so create a new one
+                        layerNodeList.append([self.createLayer(layerNodeList, layer_name), element])
+                    else:
+                        layerNodeList.append([currentLayer, element]) #layer is existent. append items to this later
+                                
+        for layerNode in layerNodeList:
+            layerNode[0].append(layerNode[1])
+                
+LayerGroup().run()
\ No newline at end of file