local_css_updater.py

#!/usr/bin/env python3

# Config

watch_dir_path = "D:\\Documents\\LoL Subreddit\\CSS\\Main v2.0\\"
main_file = "theme.less"
include_ext = ".less"
exclude_files = ["style-darkmode.less", "style.less"]
extend_css_file = "css/champion-flair.css"
output_file = "css/stylesheet.css"

use_command = True
command = "lessc \"{file}\""

remote_update = True
user_agent = "script:CSS dev updater:v1.0 (by /u/TheEnigmaBlade)"
subreddit = "lolcsstest"

# Main

import sys, time, subprocess, re
import reddit, praw.errors
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler

r = None

def init_reddit():
	global r
	if remote_update:
		if r:
			reddit.destroy_reddit(r)
		r = reddit.initialize_reddit(user_agent, oauth_scopes={"modconfig"})

last_time = 0
wait_len = 10

def update_css():
	global last_time
	curr_time = time.time()
	if curr_time - last_time < wait_len:
		last_time = curr_time
		return
	
	print("Updating CSS...", end=" ")
	path = watch_dir_path + main_file
	p = subprocess.Popen(command.format(file=path), shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
	output = p.stdout.read()
	error = p.stderr.read()
	
	if error and len(error) > 0:
		error = error.decode("utf-8")
		print("lessc failed!", file=sys.stderr)
		print(error, file=sys.stderr)
		return
	
	output = output.decode("utf-8")
	output = clean_css(output)
		
	if extend_css_file:
		with open(extend_css_file, "r") as f:
			output += f.read()
	with open(output_file, "w") as f:
		f.write(output)
	
	if remote_update:
		update_reddit(output)

def clean_css(css):
	css = css.replace("  ", "\t")
	css = css.replace(" 0px", " 0")
	return css

def update_reddit(css):
	print("reddit...", end=" ")
	try:
		response = r.set_stylesheet(subreddit, css)
		if "errors" in response and len(response["errors"]) > 0:
			errors = response["errors"]
			print("failed!")
			print("Error when updating stylesheet", file=sys.stderr)
			print(errors, file=sys.stderr)
		else:
			print("done!")
	except praw.errors.OAuthInvalidToken:
		init_reddit()
		update_reddit(css)

class FileSaveWatcher(FileSystemEventHandler):
	ignores = [watch_dir_path+p for p in exclude_files]
	locked = False
	
	def on_any_event(self, event):
		#Check if ignored
		if event.src_path in self.ignores:
			return
		if not event.src_path.endswith(include_ext):
			return
		
		# I hope boolean assignment is atomic
		if not self.locked:
			self.locked = True
			update_css()
			self.locked = False

if __name__ == "__main__":
	init_reddit()
	
	import sys
	if len(sys.argv) == 2 and sys.argv[1] == "--no-watch":
		update_css()
	else:
		observer = Observer()
		observer.schedule(FileSaveWatcher(), watch_dir_path, recursive=True)
		observer.start()
		try:
			while True:
				time.sleep(1)
		except KeyboardInterrupt:
			observer.stop()
		observer.join()