filtered chunks table,
[redakcja.git] / apps / dvcs / models.py
index 262472a..177b0d3 100644 (file)
@@ -1,6 +1,7 @@
 from datetime import datetime
 
 from django.db import models
+from django.db.models.base import ModelBase
 from django.contrib.auth.models import User
 from django.utils.translation import ugettext_lazy as _
 from mercurial import mdiff, simplemerge
@@ -20,6 +21,7 @@ class Tag(models.Model):
     _object_cache = {}
 
     class Meta:
+        abstract = True
         ordering = ['ordering']
 
     def __unicode__(self):
@@ -38,6 +40,16 @@ class Tag(models.Model):
     def listener_changed(sender, instance, **kwargs):
         sender._object_cache = {}
 
+    def next(self):
+        """
+            Returns the next tag - stage to work on.
+            Returns None for the last stage.
+        """
+        try:
+            return Tag.objects.filter(ordering__gt=self.ordering)[0]
+        except IndexError:
+            return None
+
 models.signals.pre_save.connect(Tag.listener_changed, sender=Tag)
 
 
@@ -50,9 +62,9 @@ class Change(models.Model):
         Data contains a pickled diff needed to reproduce the initial document.
     """
     author = models.ForeignKey(User, null=True, blank=True)
-    author_desc = models.CharField(max_length=128, null=True, blank=True)
+    author_name = models.CharField(max_length=128, null=True, blank=True)
+    author_email = models.CharField(max_length=128, null=True, blank=True)
     patch = models.TextField(blank=True)
-    tree = models.ForeignKey('Document')
     revision = models.IntegerField(db_index=True)
 
     parent = models.ForeignKey('self',
@@ -68,9 +80,8 @@ class Change(models.Model):
                         default=datetime.now)
     publishable = models.BooleanField(default=False)
 
-    tags = models.ManyToManyField(Tag)
-
     class Meta:
+        abstract = True
         ordering = ('created_at',)
         unique_together = ['tree', 'revision']
 
@@ -84,7 +95,10 @@ class Change(models.Model):
                 self.author.last_name, 
                 self.author.email)
         else:
-            return self.author_desc
+            return "%s <%s>" % (
+                self.author_name,
+                self.author_email
+                )
 
 
     def save(self, *args, **kwargs):
@@ -108,29 +122,30 @@ class Change(models.Model):
         if self.parent is None and self.merge_parent is not None:
             return self.apply_to(self.merge_parent.materialize())
 
-        changes = Change.objects.exclude(parent=None).filter(
-                        tree=self.tree,
+        changes = self.tree.change_set.exclude(parent=None).filter(
                         revision__lte=self.revision).order_by('revision')
-        text = u''
+        text = ''
         for change in changes:
             text = change.apply_to(text)
-        return text
+        return text.decode('utf-8')
 
     def make_child(self, patch, description, author=None,
-            author_desc=None, tags=None):
+            author_name=None, author_email=None, tags=None):
         ch = self.children.create(patch=patch,
                         tree=self.tree, author=author,
-                        author_desc=author_desc,
+                        author_name=author_name,
+                        author_email=author_email,
                         description=description)
         if tags is not None:
             ch.tags = tags
         return ch
 
     def make_merge_child(self, patch, description, author=None, 
-            author_desc=None, tags=None):
+            author_name=None, author_email=None, tags=None):
         ch = self.merge_children.create(patch=patch,
                         tree=self.tree, author=author,
-                        author_desc=author_desc,
+                        author_name=author_name,
+                        author_email=author_email,
                         description=description,
                         tags=tags)
         if tags is not None:
@@ -140,7 +155,8 @@ class Change(models.Model):
     def apply_to(self, text):
         return mdiff.patch(text, pickle.loads(self.patch.encode('ascii')))
 
-    def merge_with(self, other, author=None, author_desc=None,
+    def merge_with(self, other, author=None, 
+            author_name=None, author_email=None, 
             description=u"Automatic merge."):
         assert self.tree_id == other.tree_id  # same tree
         if other.parent_id == self.pk:
@@ -156,7 +172,9 @@ class Change(models.Model):
         patch = self.make_patch(local, result)
         return self.children.create(
                     patch=patch, merge_parent=other, tree=self.tree,
-                    author=author, author_desc=author_desc,
+                    author=author,
+                    author_name=author_name,
+                    author_email=author_email,
                     description=description)
 
     def revert(self, **kwargs):
@@ -164,15 +182,60 @@ class Change(models.Model):
         self.tree.commit(text=self.materialize(), **kwargs)
 
 
+def create_tag_model(model):
+    name = model.__name__ + 'Tag'
+    attrs = {
+        '__module__': model.__module__,
+    }
+    return type(name, (Tag,), attrs)
+
+
+def create_change_model(model):
+    name = model.__name__ + 'Change'
+
+    attrs = {
+        '__module__': model.__module__,
+        'tree': models.ForeignKey(model, related_name='change_set'),
+        'tags': models.ManyToManyField(model.tag_model, related_name='change_set'),
+    }
+    return type(name, (Change,), attrs)
+
+
+
+class DocumentMeta(ModelBase):
+    "Metaclass for Document models."
+    def __new__(cls, name, bases, attrs):
+        model = super(DocumentMeta, cls).__new__(cls, name, bases, attrs)
+        if not model._meta.abstract:
+            # create a real Tag object and `stage' fk
+            model.tag_model = create_tag_model(model)
+            models.ForeignKey(model.tag_model, 
+                null=True, blank=True).contribute_to_class(model, 'stage')
+
+            # create real Change model and `head' fk
+            model.change_model = create_change_model(model)
+            models.ForeignKey(model.change_model,
+                    null=True, blank=True, default=None,
+                    help_text=_("This document's current head."),
+                    editable=False).contribute_to_class(model, 'head')
+
+        return model
+
+
+
 class Document(models.Model):
     """
         File in repository.        
     """
-    creator = models.ForeignKey(User, null=True, blank=True, editable=False)
-    head = models.ForeignKey(Change,
-                    null=True, blank=True, default=None,
-                    help_text=_("This document's current head."),
-                    editable=False)
+    __metaclass__ = DocumentMeta
+
+    creator = models.ForeignKey(User, null=True, blank=True, editable=False,
+                related_name="created_documents")
+
+    user = models.ForeignKey(User, null=True, blank=True)
+
+    class Meta:
+        abstract = True
 
     def __unicode__(self):
         return u"{0}, HEAD: {1}".format(self.id, self.head_id)
@@ -199,7 +262,7 @@ class Document(models.Model):
         else:
             parent = kwargs['parent']
             if not isinstance(parent, Change):
-                parent = Change.objects.get(pk=kwargs['parent'])
+                parent = self.change_set.objects.get(pk=kwargs['parent'])
 
         if 'patch' not in kwargs:
             if 'text' not in kwargs:
@@ -211,21 +274,28 @@ class Document(models.Model):
             patch = kwargs['patch']
 
         author = kwargs.get('author', None)
-        author_desc = kwargs.get('author_desc', None)
+        author_name = kwargs.get('author_name', None)
+        author_email = kwargs.get('author_email', None)
         tags = kwargs.get('tags', [])
+        if tags:
+            # set stage to next tag after the commited one
+            self.stage = max(tags, key=lambda t: t.ordering).next()
 
         old_head = self.head
         if parent != old_head:
             change = parent.make_merge_child(patch, author=author, 
-                    author_desc=author_desc,
+                    author_name=author_name,
+                    author_email=author_email,
                     description=kwargs.get('description', ''),
                     tags=tags)
             # not Fast-Forward - perform a merge
             self.head = old_head.merge_with(change, author=author,
-                    author_desc=author_desc)
+                    author_name=author_name,
+                    author_email=author_email)
         else:
             self.head = parent.make_child(patch, author=author, 
-                    author_desc=author_desc, 
+                    author_name=author_name,
+                    author_email=author_email,
                     description=kwargs.get('description', ''),
                     tags=tags)
 
@@ -259,7 +329,7 @@ class Document(models.Model):
         if not isinstance(instance, Document):
             return
         if created:
-            instance.head = Change.objects.create(
+            instance.head = instance.change_model.objects.create(
                     revision=-1,
                     author=instance.creator,
                     patch=Change.make_patch('', ''),