Added svg formatter for diagrams stored in git to minimize diffs

util/format_svg.py

@@ -0,0 +1,51 @@
+#!/usr/bin/python3
+
+##
+## util/format_svg.py
+##
+## Copyright (c) 2021-2022 Bartek Kryza <bkryza@gmail.com>
+##
+## Licensed under the Apache License, Version 2.0 (the "License");
+## you may not use this file except in compliance with the License.
+## You may obtain a copy of the License at
+##
+##     http://www.apache.org/licenses/LICENSE-2.0
+##
+## Unless required by applicable law or agreed to in writing, software
+## distributed under the License is distributed on an "AS IS" BASIS,
+## WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+## See the License for the specific language governing permissions and
+## limitations under the License.
+##
+
+import sys
+from lxml import etree
+
+def main(argv):
+    if len(argv) < 1:
+        print('Usage: \n')
+        print('\t\t ./format_svg.py input_file1.svg input_file2.svg ...\n')
+        sys.exit(1)
+
+    for inputfile in argv:
+        # Read svg file contents
+        with open(inputfile, 'r') as f:
+            xml = f.read()
+
+        # Parse SVG XML
+        tree = etree.fromstring(bytes(xml, encoding='utf8'))
+
+        # Remove comments from SVG, to minimize diff
+        # when updating diagrams in Git
+        comments = tree.xpath('//comment()')
+
+        for c in comments:
+            p = c.getparent()
+            p.remove(c)
+
+        # Overwrite the input svg properly formatted
+        etree.ElementTree(tree).write(inputfile, encoding='utf-8', pretty_print=True)
+
+
+if __name__ == "__main__":
+    main(sys.argv[1:])