circle: create a watch command

usage: ./manage.py watch

circle/watch.py → circle/common/management/commands/watch.py

 import subprocess
 import os
 import pyinotify
+
+from django.core.management.base import BaseCommand
 from django.conf import settings
 
 STATIC_FILES = u'--include-path={}'.format(':'.join(settings.STATICFILES_DIRS))
@@ -26,29 +28,30 @@ class LessUtils(object):
             print("Successfully compiled:\n%s\n->\n%s" % (
                 less_pathname, css_pathname))
 
-
-if __name__ == "__main__":
-    # for first run compile everything
-    print("Initial LESS compiles")
-    current_dir = os.path.dirname(os.path.realpath(__file__))
-
-    for root, dirs, files in os.walk("/home/cloud/circle/circle"):
+    @staticmethod
+    def initial_compile():
+        """ Walks through the project looking for LESS files
+        and compiles them into CSS.
+        """
+        for root, dirs, files in os.walk(settings.SITE_ROOT):
             for f in files:
                 if not f.endswith(".less"):
                     continue
 
-            relpath = os.path.relpath(root, current_dir)
-            if relpath.startswith(("static_collected", "bower_components")):
+                relpath = os.path.relpath(root, settings.SITE_ROOT)
+                if relpath.startswith(("static_collected",
+                                       "bower_components")):
                     continue
 
                 less_pathname = "%s/%s" % (root, f)
                 css_pathname = LessUtils.less_path_to_css_path(less_pathname)
                 LessUtils.compile_less(less_pathname, css_pathname)
 
-    print("\n%s\n" % ("=" * 30))
-    print("End of initial LESS compiles\n")
-
-    # after first run watch less files
+    @staticmethod
+    def start_watch():
+        """ Watches for changes in LESS files recursively from the
+        project's root and compiles the files
+        """
         wm = pyinotify.WatchManager()
 
         class EventHandler(pyinotify.ProcessEvent):
@@ -61,5 +64,19 @@ if __name__ == "__main__":
 
         handler = EventHandler()
         notifier = pyinotify.Notifier(wm, handler)
-    wm.add_watch(current_dir, pyinotify.IN_MODIFY, rec=True)
+        wm.add_watch(settings.SITE_ROOT, pyinotify.IN_MODIFY, rec=True)
         notifier.loop()
+
+
+class Command(BaseCommand):
+    help = "Compiles all LESS files then watches for changes."
+
+    def handle(self, *args, **kwargs):
+        # for first run compile everything
+        print("Initial LESS compiles")
+        LessUtils.initial_compile()
+        print("\n%s\n" % ("=" * 30))
+        print("End of initial LESS compiles\n")
+
+        # after first run watch less files
+        LessUtils.start_watch()