Add helper script to convert journey JSON data to GeoJSON

This is useful to inspect navigation paths in QGIS.

src/tools/journey2geojson.py

+#!/usr/bin/env python3
+#
+# SPDX-FileCopyrightText: 2021 Volker Krause <vkrause@kde.org>
+# SPDX-License-Identifier: LGPL-2.0-or-later
+#
+# Converts a serialized journey query response into GeoJSON
+# Useful for inspecting navigation path details in QGIS
+#
+
+import argparse
+import json
+import os
+import re
+
+parser = argparse.ArgumentParser(description='Generates a GeoJSON document from journey query result')
+parser.add_argument('--journey', type=str, required=True, help='Path to the journey JSON')
+arguments = parser.parse_args()
+
+output = {}
+output['type'] = 'FeatureCollection'
+output['name'] = 'Journey Paths'
+output['features'] = []
+
+inFile = open(arguments.journey, 'r')
+inJson = json.load(inFile)
+
+for journey in inJson:
+    for section in journey['sections']:
+        for path in section['path']['sections']:
+            properties = {}
+            properties['name'] = path.get('description', '<anonymous>')
+            feature = {}
+            feature['type'] = 'Feature'
+            feature['properties'] = properties
+            feature['geometry'] = path['path']
+            output['features'].append(feature)
+
+print(json.dumps(output))