gpx_order.py

#!/usr/bin/python
#
# Copyright 2019 Dan Smith <dsmith+gist@danplanet.com>
#
# This fixes broken Gaia GPX files which fail to pass the GPX 1.1 schema
# check (and thus won't import into real software) because the elements
# are ordered incorrectly.
#
# Run me like this:
#
#   python gpx_order.py broken_gaia_file.gpx fixed_gaia_file.gpx
#

import collections
import itertools
import os
import sys
import xml.etree.ElementTree as ET

ET.register_namespace('', "http://www.topografix.com/GPX/1/1")

try:
    input_fn = sys.argv[1]
except IndexError:
    print('Usage: %s INPUT_FILE [OUTPUT_FILE]' % (
        os.path.basename(sys.argv[0])))
    sys.exit(1)

try:
    output_fn = sys.argv[2]
except IndexError:
    output_fn = 'new_%s' % input_fn

tree = ET.parse(input_fn)
root = tree.getroot()

# Find all the elements
elements = collections.defaultdict(list)
for child in root:
    print(child.tag)
    elements[child.tag].append(child)

# Remove them all from the tree
for child in itertools.chain.from_iterable(elements.values()):
    root.remove(child)

# Add them back in the proper order
for etype in ('metadata', 'wpt', 'rte', 'trk', 'extensions'):
    etype = '%s%s' % ('{http://www.topografix.com/GPX/1/1}', etype)
    print('Adding %i %s elements' % (len(elements[etype]), etype))
    for element in elements[etype]:
        root.append(element)

print('Writing %s' % output_fn)
tree.write(output_fn)