lessc.py

import sublime, sublime_plugin, subprocess, os

class CompileLessOnSave(sublime_plugin.EventListener):
    def on_post_save(self, view):

        if not view.file_name().endswith('.less'):
            return

        if os.name == "nt":
            startupinfo = subprocess.STARTUPINFO()
            startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW

        folder_name, file_name = os.path.split(view.file_name())
        
        args = ['lessc', '-m', view.file_name()]
        print('Minifying: ' +  view.file_name())
        print(' '.join(args)) # lessc -m C:\lesstest\hello.less
        
        view.window().run_command('exec', {'cmd': args, 'working_dir': folder_name})         
            
        process = subprocess.Popen(args, stdin=subprocess.PIPE, stdout=subprocess.PIPE, startupinfo=startupinfo)
        print('Compiled ' + view.file_name())