watch.py

watch.py

#!/usr/bin/env python

import os
import time
import logging
import subprocess

from watchdog.observers import Observer
from watchdog.events import (
    PatternMatchingEventHandler, EVENT_TYPE_MODIFIED, EVENT_TYPE_MOVED,
    EVENT_TYPE_CREATED
)

LOG = logging.getLogger(__name__)

SASS_COMPILER = 'sassc'


class SASSHandler(PatternMatchingEventHandler):
    patterns = ['*.scss', '*.sass']
    ignore_directories = True

    def compile_sass(self, event):
        input_file = getattr(event, 'dest_path', event.src_path)

        file_name, extension = os.path.splitext(os.path.basename(input_file))

        if extension in ('.scss', '.sass'):
            output_path = os.path.dirname(input_file).replace('scss', 'css') \
                .replace('sass', 'css')
            output_file = os.path.join(output_path, '{}.css'.format(file_name))

            if not os.path.exists(output_path):
                os.makedirs(output_path)

            subprocess.call([SASS_COMPILER, input_file, output_file])

            LOG.info('Compiled {} -> {}'.format(input_file, output_file))

    def on_any_event(self, event):
        if event.event_type in (EVENT_TYPE_MODIFIED, EVENT_TYPE_MOVED,
                                EVENT_TYPE_CREATED):
            self.compile_sass(event)


if __name__ == '__main__':
    logging.basicConfig(level=logging.INFO,
                        format='%(asctime)s - %(message)s',
                        datefmt='%Y-%m-%d %H:%M:%S')

    observer = Observer()
    observer.schedule(SASSHandler(), '.', recursive=True)
    observer.start()

    try:
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        observer.stop()

    observer.join()