add render command

management/commands/render.py

@@ -0,0 +1,28 @@
+import json
+import os
+
+from django.core.management.base import BaseCommand
+from django.conf import settings
+
+from ...render import compose, render
+
+
+class Command(BaseCommand):
+    help = 'generate symlinks to clips and clips.json'
+
+    def add_arguments(self, parser):
+        parser.add_argument('--prefix', action='store', dest='prefix', default="/srv/t_for_time", help='prefix to build clips in')
+        parser.add_argument('--duration', action='store', dest='duration', default="150", help='target duration in seconds')
+        parser.add_argument('--offset', action='store', dest='offset', default="1024", help='inital offset in pi')
+
+    def handle(self, **options):
+        prefix = options['prefix']
+        target = int(options['duration'])
+        base = int(options['offset'])
+
+        with open(os.path.join(prefix, "clips.json")) as fd:
+            clips = json.load(fd)
+        scene = compose(clips, target=target, base=base)
+        render(prefix, scene)
+        with open(os.path.join(prefix, 'scene-%s.json' % base), 'w') as fd:
+            json.dump(scene, fd, indent=2, ensure_ascii=False)