A little command line Python 2.7 script to compile RapydScript and RapydCSS files upon save. See the docstring for more details.

autocompile_rapydstuff.py

#!/usr/bin/env python
"""
Description
-----------
This little Python 3 script watches RapydScript/PyScss files contained
within a subdirectory of the directory from which it's run and executes the
commands 
``rapydscript <filename>.pyj -o <filename>.js`` and 
``pyscss <filename>.sass -o <filename>.css`` 
whenever a RapydScript file ``<filename>.pyj`` or a PyScss file 
``<filename>.sass`` is modified.


Instructions
-------------
#. Install the required packages below.
#. Save this script in a directory on you path.
#. Open a terminal, change to a directory that contains your 
  RapydScript/PyScss within its subtree, 
  run the script via the command ``autocompile_rapydstuff.py``.

Requirements
-------------
- Python 3+
- RapydScript, a NodeJS package
- PyScss, a Python package
- watchdog, a Python package

Todo
----
- Allow option flags to be passed to the RapydScript/PyScss compilers.
- Add a RapydML compiler.
"""

import subprocess
import time
import sys
import os

import watchdog
from watchdog.observers import Observer
from watchdog.tricks import Trick


def get_ext(path):
    return path.rsplit('.', 1)[-1]

def get_new_path(path, ext=''):
    return path.rsplit('.', 1)[0] + '.' + ext


class RapydScriptTrick(Trick):

    def __init__(self, **kwargs):
        super(RapydScriptTrick, self).__init__(**kwargs)
    
    def on_modified(self, event):
        if get_ext(event.src_path) != 'pyj':
            return
        
        src_file = event.src_path
        dest_file = get_new_path(src_file, ext='js')
        process = subprocess.call(['rapydscript', src_file, '-p', 
          '-o', dest_file])


class PyScssTrick(Trick):

    def __init__(self, **kwargs):
        super(PyScssTrick, self).__init__(**kwargs)
    
    def on_modified(self, event):
        if get_ext(event.src_path) != 'sass':
            return
        
        src_file = event.src_path
        dest_file = get_new_path(src_file, ext='css')
        process = subprocess.call(['pyscss', src_file, '-o', dest_file])


class RapydMLTrick(Trick):

    def __init__(self, **kwargs):
        super(RapydMLTrick, self).__init__(**kwargs)
    
    def on_modified(self, event):
        if get_ext(event.src_path) != 'pyml':
            return
        
        src_file = event.src_path
        process = subprocess.call(['rapydml', src_file])


if __name__ == '__main__':
    path = sys.argv[1] if len(sys.argv) > 1 else os.getcwd()
    print('Watching {!s}...'.format(path))
    event_handler_pyj = RapydScriptTrick()
    event_handler_sass = PyScssTrick()
    event_handler_pyml = RapydMLTrick()
    observer = Observer()
    observer.schedule(event_handler_pyj, path, recursive=True)
    observer.schedule(event_handler_sass, path, recursive=True)
    observer.schedule(event_handler_pyml, path, recursive=True)
    observer.start()
    try:
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        observer.stop()
    observer.join()