add embroider_update extension to convert old-style param names to new

embroider_update.inx

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<inkscape-extension xmlns="http://www.inkscape.org/namespace/inkscape/extension">
+    <_name>Update embroidery param names</_name>
+    <id>lexelby.embroider.update</id>
+    <dependency type="executable" location="extensions">embroider_update.py</dependency>
+    <dependency type="executable" location="extensions">inkex.py</dependency>
+    <effect>
+        <object-type>all</object-type>
+        <effects-menu>
+            <submenu _name="Embroidery"/>
+        </effects-menu>
+    </effect>
+    <script>
+        <command reldir="extensions" interpreter="python">embroider_update.py</command>
+    </script>
+</inkscape-extension>

embroider_update.py

@@ -0,0 +1,46 @@
+#!/usr/bin/python
+#
+# Update embroidery parameters stored in XML attributes from old to new
+# format.
+
+import sys
+sys.path.append("/usr/share/inkscape/extensions")
+import os
+import inkex
+
+PIXELS_PER_MM = 10
+
+class EmbroiderParams(inkex.Effect):
+    def __init__(self, *args, **kwargs):
+        inkex.Effect.__init__(self)
+
+        self.mapping = { "zigzag_spacing":                "zigzag_spacing_mm",
+                         "row_spacing":                   "row_spacing_mm",
+                         "pull_compensation":             "pull_compensation_mm",
+                         "max_stitch_length":             "max_stitch_length_mm",
+                         "satin_underlay":                "contour_underlay",
+                         "satin_underlay_inset":          "contour_underlay_inset_mm",
+                         "satin_zigzag_underlay_spacing": "zigzag_underlay_spacing_mm",
+                         "satin_center_walk":             "center_walk_underlay",
+                         "stitch_length":                 "running_stitch_length_mm",
+                       }
+
+    def effect(self):    
+        for node in self.document.getroot().iter():
+            for old, new in self.mapping.iteritems():
+                old = "embroider_%s" % old
+                new = "embroider_%s" % new
+
+                value = node.attrib.pop(old, None)
+                if value:
+                    if new.endswith('_mm') and value.strip():
+                        value = str(float(value) / PIXELS_PER_MM)
+
+                    node.set(new, value)
+
+            if 'embroider_zigzag_underlay_spacing_mm' in node.attrib:
+                node.set('embroider_zigzag_underlay', 'yes')
+
+if __name__ == '__main__':
+    e = EmbroiderParams()
+    e.affect()