svg2png.py

from pathlib import Path
import re
import shlex
import subprocess
import threading
import queue
import sys


to_p = Path('svg2png')
to_p.mkdir(exist_ok=True)
for f in to_p.glob('*.png'):
    f.unlink()

images = [f for f in Path('_build/html/_images/').glob('*.svg')
          if not re.match(r'^seg[0-9A-F]{2}$', f.stem)]
q = queue.Queue()


def worker():
    while True:
        item = q.get()
        if item is None:
            break

        to = to_p / item.with_suffix('.png').name
        args = ['inkscape', '-z', '-e', str(to.absolute()), '-w', '800',
                '-background', 'white', str(item.absolute())]
        print("Running:  {}".format(' '.join(shlex.quote(x) for x in args)))
        proc = subprocess.run(args, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
        if b'Bitmap saved as' not in proc.stdout:
            print("Error!")
            print(proc.stdout)
            sys.exit(1)

        q.task_done()

NUM_THREADS = 8
threads = []
for i in range(NUM_THREADS):
    t = threading.Thread(target=worker)
    t.start()
    threads.append(t)

for img in sorted(images):
    q.put(img)

q.join()

for i in range(NUM_THREADS):
    q.put(None)
for t in threads:
    t.join()