Rearrange source to src dir.
[redakcja.git] / apps / dvcs / models.py
diff --git a/apps/dvcs/models.py b/apps/dvcs/models.py
deleted file mode 100644 (file)
index f81f2ca..0000000
+++ /dev/null
@@ -1,286 +0,0 @@
-from datetime import datetime
-
-from django.db import models
-from django.contrib.auth.models import User
-from django.utils.translation import ugettext_lazy as _
-from mercurial import mdiff, simplemerge
-import pickle
-
-
-class Tag(models.Model):
-    """
-        a tag (e.g. document stage) which can be applied to a change
-    """
-
-    name = models.CharField(_('name'), max_length=64)
-    slug = models.SlugField(_('slug'), unique=True, max_length=64, 
-            null=True, blank=True)
-    ordering = models.IntegerField(_('ordering'))
-
-    _object_cache = {}
-
-    class Meta:
-        ordering = ['ordering']
-
-    def __unicode__(self):
-        return self.name
-
-    @classmethod
-    def get(cls, slug):
-        if slug in cls._object_cache:
-            return cls._object_cache[slug]
-        else:
-            obj = cls.objects.get(slug=slug)
-            cls._object_cache[slug] = obj
-            return obj
-
-    @staticmethod
-    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)
-
-
-class Change(models.Model):
-    """
-        Single document change related to previous change. The "parent"
-        argument points to the version against which this change has been 
-        recorded. Initial text will have a null parent.
-        
-        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)
-    patch = models.TextField(blank=True)
-    tree = models.ForeignKey('Document')
-    revision = models.IntegerField(db_index=True)
-
-    parent = models.ForeignKey('self',
-                        null=True, blank=True, default=None,
-                        related_name="children")
-
-    merge_parent = models.ForeignKey('self',
-                        null=True, blank=True, default=None,
-                        related_name="merge_children")
-
-    description = models.TextField(blank=True, default='')
-    created_at = models.DateTimeField(editable=False, db_index=True, 
-                        default=datetime.now)
-    publishable = models.BooleanField(default=False)
-
-    tags = models.ManyToManyField(Tag)
-
-    class Meta:
-        ordering = ('created_at',)
-        unique_together = ['tree', 'revision']
-
-    def __unicode__(self):
-        return u"Id: %r, Tree %r, Parent %r, Patch '''\n%s'''" % (self.id, self.tree_id, self.parent_id, self.patch)
-
-    def author_str(self):
-        if self.author:
-            return "%s %s <%s>" % (
-                self.author.first_name,
-                self.author.last_name, 
-                self.author.email)
-        else:
-            return self.author_desc
-
-
-    def save(self, *args, **kwargs):
-        """
-            take the next available revision number if none yet
-        """
-        if self.revision is None:
-            self.revision = self.tree.revision() + 1
-        return super(Change, self).save(*args, **kwargs)
-
-    @staticmethod
-    def make_patch(src, dst):
-        if isinstance(src, unicode):
-            src = src.encode('utf-8')
-        if isinstance(dst, unicode):
-            dst = dst.encode('utf-8')
-        return pickle.dumps(mdiff.textdiff(src, dst))
-
-    def materialize(self):
-        # special care for merged nodes
-        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,
-                        revision__lte=self.revision).order_by('revision')
-        text = u''
-        for change in changes:
-            text = change.apply_to(text)
-        return text
-
-    def make_child(self, patch, description, author=None,
-            author_desc=None, tags=None):
-        ch = self.children.create(patch=patch,
-                        tree=self.tree, author=author,
-                        author_desc=author_desc,
-                        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):
-        ch = self.merge_children.create(patch=patch,
-                        tree=self.tree, author=author,
-                        author_desc=author_desc,
-                        description=description,
-                        tags=tags)
-        if tags is not None:
-            ch.tags = tags
-        return ch
-
-    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,
-            description=u"Automatic merge."):
-        assert self.tree_id == other.tree_id  # same tree
-        if other.parent_id == self.pk:
-            # immediate child 
-            return other
-
-        local = self.materialize()
-        base = other.merge_parent.materialize()
-        remote = other.apply_to(base)
-
-        merge = simplemerge.Merge3Text(base, local, remote)
-        result = ''.join(merge.merge_lines())
-        patch = self.make_patch(local, result)
-        return self.children.create(
-                    patch=patch, merge_parent=other, tree=self.tree,
-                    author=author, author_desc=author_desc,
-                    description=description)
-
-    def revert(self, **kwargs):
-        """ commit this version of a doc as new head """
-        self.tree.commit(text=self.materialize(), **kwargs)
-
-
-class Document(models.Model):
-    """
-        File in repository.        
-    """
-    creator = models.ForeignKey(User, null=True, blank=True, editable=False,
-                related_name="created_documents")
-    head = models.ForeignKey(Change,
-                    null=True, blank=True, default=None,
-                    help_text=_("This document's current head."),
-                    editable=False)
-
-    user = models.ForeignKey(User, null=True, blank=True)
-    stage = models.ForeignKey(Tag, null=True, blank=True)
-
-    def __unicode__(self):
-        return u"{0}, HEAD: {1}".format(self.id, self.head_id)
-
-    @models.permalink
-    def get_absolute_url(self):
-        return ('dvcs.views.document_data', (), {
-                        'document_id': self.id,
-                        'version': self.head_id,
-        })
-
-    def materialize(self, change=None):
-        if self.head is None:
-            return u''
-        if change is None:
-            change = self.head
-        elif not isinstance(change, Change):
-            change = self.change_set.get(pk=change)
-        return change.materialize()
-
-    def commit(self, **kwargs):
-        if 'parent' not in kwargs:
-            parent = self.head
-        else:
-            parent = kwargs['parent']
-            if not isinstance(parent, Change):
-                parent = Change.objects.get(pk=kwargs['parent'])
-
-        if 'patch' not in kwargs:
-            if 'text' not in kwargs:
-                raise ValueError("You must provide either patch or target document.")
-            patch = Change.make_patch(self.materialize(change=parent), kwargs['text'])
-        else:
-            if 'text' in kwargs:
-                raise ValueError("You can provide only text or patch - not both")
-            patch = kwargs['patch']
-
-        author = kwargs.get('author', None)
-        author_desc = kwargs.get('author_desc', 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,
-                    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)
-        else:
-            self.head = parent.make_child(patch, author=author, 
-                    author_desc=author_desc, 
-                    description=kwargs.get('description', ''),
-                    tags=tags)
-
-        self.save()
-        return self.head
-
-    def history(self):
-        return self.change_set.filter(revision__gt=-1)
-
-    def revision(self):
-        rev = self.change_set.aggregate(
-                models.Max('revision'))['revision__max']
-        return rev if rev is not None else -1
-
-    def at_revision(self, rev):
-        if rev is not None:
-            return self.change_set.get(revision=rev)
-        else:
-            return self.head
-
-    def publishable(self):
-        changes = self.change_set.filter(publishable=True).order_by('-created_at')[:1]
-        if changes.count():
-            return changes[0]
-        else:
-            return None
-
-    @staticmethod
-    def listener_initial_commit(sender, instance, created, **kwargs):
-        # run for Document and its subclasses
-        if not isinstance(instance, Document):
-            return
-        if created:
-            instance.head = Change.objects.create(
-                    revision=-1,
-                    author=instance.creator,
-                    patch=Change.make_patch('', ''),
-                    tree=instance)
-            instance.save()
-
-models.signals.post_save.connect(Document.listener_initial_commit)