Add layers export extension as a tar creation extension

(bzr r13080)

2 files changed, 132 insertions, 0 deletions

diff --git a/share/extensions/tar_layers.inx b/share/extensions/tar_layers.inx
new file mode 100644
index 000000000..43664c910
--- /dev/null
+++ b/share/extensions/tar_layers.inx
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<inkscape-extension xmlns="http://www.inkscape.org/namespace/inkscape/extension">
+  <_name>Collection of SVG files One per root layer</_name>
+  <id>org.inkscape.output.LAYERS</id>
+  <dependency type="extension">org.inkscape.output.svg.inkscape</dependency>
+  <dependency type="executable" location="extensions">tar_layers.py</dependency>
+  <dependency type="executable" location="extensions">inkex.py</dependency>
+  <output>
+    <extension>.tar</extension>
+    <mimetype>application/tar</mimetype>
+    <_filetypename>Layers as Seperate SVG (*.tar)</_filetypename>
+    <_filetypetooltip>Each layer split into it's own svg file and collected as a tape archive (tar file)</_filetypetooltip>
+    <dataloss>false</dataloss>
+  </output>
+  <script>
+    <command reldir="extensions" interpreter="python">tar_layers.py</command>
+    <helper_extension>org.inkscape.output.svg.inkscape</helper_extension>
+  </script>
+</inkscape-extension>
diff --git a/share/extensions/tar_layers.py b/share/extensions/tar_layers.py
new file mode 100755
index 000000000..8d7ce0541
--- /dev/null
+++ b/share/extensions/tar_layers.py
@@ -0,0 +1,113 @@
+#!/usr/bin/env python
+#
+# Copyright (C) 2014 Martin Owens, email@doctormo.org
+#
+# 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+"""
+An extention to export multiple svg files from a single svg file containing layers.
+
+Each defs is duplicated for each svg outputed.
+"""
+import os
+import sys
+import copy
+import tarfile
+import StringIO
+
+# Inkscape Libraries
+import inkex
+import simplestyle
+
+GROUP = "{http://www.w3.org/2000/svg}g"
+LABEL = "{http://www.inkscape.org/namespaces/inkscape}label"
+GROUPMODE = "{http://www.inkscape.org/namespaces/inkscape}groupmode"
+
+
+def oprint(item):
+    """DEBUG print an object"""
+    for name in dir(item):
+        value = getattr(item, name)
+        if callable(value):
+            yield "%s()" % name
+        else:
+            yield "%s = %s" % (name, str(value))
+
+def fprint(data):
+    """DEBUG print something"""
+    if isinstance(data, basestring):
+        sys.stderr.write("DEBUG: %s\n" % data)
+    else:
+        return fprint("%s(%s)\n    " % (str(data), type(data).__name__) \
+                + "\n    ".join(oprint(data)))
+
+
+class LayersOutput(inkex.Effect):
+    """Entry point to our layers export"""
+    def __init__(self):
+        inkex.Effect.__init__(self)
+        if os.name == 'nt':
+            self.encoding = "cp437"
+        else:
+            self.encoding = "latin-1"
+
+    def make_template(self):
+        """Returns the current document as a new empty document with the same defs"""
+        newdoc = copy.deepcopy(self.document)
+        for (name, layer) in self.layers(newdoc):
+            layer.getparent().remove(layer)
+        return newdoc
+
+    def layers(self, document):
+        for node in document.getroot().iterchildren():
+            if self.is_layer(node):
+                name = node.attrib.get(LABEL, None)
+                if name:
+                    yield (name, node)
+
+    def is_layer(self, node):
+        return node.tag == GROUP and node.attrib.get(GROUPMODE,'').lower() == 'layer'
+
+    def io_document(self, name, doc):
+        string = StringIO.StringIO()
+        doc.write(string)
+        string.seek(0)
+        info = tarfile.TarInfo(name=name+'.svg')
+        info.size=len(string.buf)
+        return dict(tarinfo=info, fileobj=string)
+
+    def effect(self):
+        # open output tar file as a stream (to stdout)
+        tar = tarfile.open(fileobj=sys.stdout, mode='w|')
+
+        template = self.make_template()
+
+        previous = None
+        for (name, _layer) in self.layers(self.document):
+            layer = copy.deepcopy(_layer)
+            if previous != None:
+                template.getroot().replace(previous, layer)
+            else:
+                template.getroot().append(layer)
+            previous = layer
+            
+            tar.addfile(**self.io_document(name, template))
+
+
+if __name__ == '__main__':   #pragma: no cover
+    e = LayersOutput()
+    e.affect()
+
+# vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 fileencoding=utf-8 textwidth=99