Fixes svg images written by Affinity etc. to work with nanosvg.

fix_svg.py

#!/usr/bin/python3
#
#       __   ___  ______
#      / /  / _ \/_  __/
#     / /__/ , _/ / /    Lindenberg
#    /____/_/|_| /_/  Research Tec.
#
#
#    https://github.com/lindenbergresearch/LRTRack
#    heapdump@icloud.com
#
#    Sound Modules for VCV Rack
#    Copyright 2017-2021 by Patrick Lindenberg / LRT
#
#    For Redistribution and use in source and binary forms,
#    with or without modification please see LICENSE.
#
import xml.etree.ElementTree as ET
import os

# basic config
NAMESPACE_URI = 'http://www.w3.org/2000/svg'
SVG_PATHS = ['./res/elements', './res/knobs', './res/panels']
MATCHING_TAG = '{' + NAMESPACE_URI + '}defs'

ET.register_namespace('', NAMESPACE_URI)

fixcount = 0


def reorder_svg(filename):
    """ Scan for a matching tag and reorder it on success """
    tree = ET.parse(filename)
    root = tree.getroot()
    defs = root.find(MATCHING_TAG)

    # TODO: test for empty matches
    if not defs:
        # print('noting to reorder for: ' + filename)
        return False

    root.remove(defs)
    root.insert(0, defs)

    # print('reorder tag: ' + MATCHING_TAG + '...')
    tree.write(filename)

    return True


def scan_path(paths, suffix):
    """ scan a specific path for the given files that matches suffix """
    matches = []

    for path in paths:
        try:
            print('scanning path: ' + path)
            entries = os.listdir(path)
        except OSError:
            print('error: invalid path: ' + path)
            return []
        else:
            for entry in entries:
                if entry.endswith(suffix):
                    matches.append(path + '/' + entry)
    return matches


print('SVG quick-fixer for nanosvg compatible vector graphics.')
print('Copyright 2021 by Lindenberg Research\n')

files = scan_path(SVG_PATHS, '.svg')

if len(files) <= 0:
    print("warning: no images found.")
    exit(255)

print("found " + str(len(files)) + " image(s) to examine.")

for file in files:
    # print("examining: " + file)
    if reorder_svg(file):
        print('reorder file: ' + file)
        fixcount += 1

print('fixed: ' + str(fixcount) + ' images.\n')

fix path scanning
reduce log messages