add a post_published signal

biblion/forms.py

@@ -8,6 +8,7 @@
 from django.contrib.sites.models import Site
 
 from biblion.models import Biblion, Post, Revision, Image
+from biblion.signals import post_published
 from biblion.utils.twitter import can_tweet
 from biblion.utils.slugify import slugify_unique
 
@@ -219,24 +220,23 @@ def __init__(self, *args, **kwargs):
 
     def save(self):
         post = super(AdminPostForm, self).save(commit=False)
-
-        if post.pk is None:
-            if self.cleaned_data["publish"]:
-                post.published = datetime.datetime.now()
-        else:
-            if Post.objects.filter(pk=post.pk, published=None).count():
-                if self.cleaned_data["publish"]:
-                    post.published = datetime.datetime.now()
+        # only publish the first time publish has been checked
+        if (post.pk is None or Post.objects.filter(pk=post.pk, published=None).count()) and self.cleaned_data["publish"]:
+            post.published = datetime.datetime.now()
+            send_published_signal = True
 
         if self.cleaned_data["publish_date"]:
             post.published = self.cleaned_data["publish_date"]
-
+        
         post.markup_type = self.cleaned_data["markup_type"]
         post.teaser = self.cleaned_data["teaser"]
         post.content = self.cleaned_data["content"]
         post.updated = datetime.datetime.now()
         post.save()
 
+        if send_published_signal:
+            post_published.send(sender=self, pk=post.pk)
+
         r = Revision()
         r.post = post
         r.title = post.title

biblion/signals.py

@@ -0,0 +1,4 @@
+from django.dispatch import Signal
+
+
+post_published = Signal(providing_args=["pk"])