-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)
fnp / redakcja.git / blobdiff