tools: add a basic SVG/PNG exporter tool

A commandline tool to convert the JSON files the GUI stores in
$XDG/tuhi/*.json. Makes testing SVG changes a bit easier.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

tools/exporter.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python3
+#
+#  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.
+#
+
+from pathlib import Path
+import argparse
+import json
+import os
+import sys
+
+# This tool isn't installed, so we can assume that the tuhi module is always
+# in the parent directory
+sys.path.insert(0, os.path.dirname(os.path.realpath(__file__)) + '/..')  # noqa
+from tuhi.export import JsonSvg, JsonPng
+
+parser = argparse.ArgumentParser(description='Converter tool from Tuhi JSON files to SVG or PNG.')
+parser.add_argument('filename', help='The JSON file to export ($HOME/.local/share/tuhi/*.json)')
+parser.add_argument('--format',
+                    help='The format to generate. Default: svg',
+                    default='svg',
+                    choices=['svg', 'png'])
+parser.add_argument('--output',
+                    type=str,
+                    help='The output file name. Default: "$PWD/inputfile.suffix"',
+                    default=None)
+parser.add_argument('--orientation',
+                    help='The orientation of the image',
+                    default='landscape',
+                    choices=['landscape', 'portrait', 'reverse-landscape', 'reverse-portrait'])
+
+ns = parser.parse_args()
+
+if ns.output is None:
+    ns.output = f"{Path(ns.filename).stem}.{ns.format}"
+
+js = json.load(open(ns.filename))
+if ns.format == 'svg':
+    JsonSvg(js, ns.orientation, ns.output)
+elif ns.format == 'png':
+    JsonPng(js, ns.orientation, ns.output)