lib/wlrepo/mercurial_backend/document.py

   1 # -*- encoding: utf-8 -*-
   2
   3 __author__ = "Łukasz Rekucki"
   4 __date__ = "$2009-09-25 09:35:06$"
   5 __doc__ = "Module documentation."
   6
   7 import wlrepo
   8
   9 class MercurialDocument(wlrepo.Document):
  10
  11     def data(self, entry):
  12         path = self._revision._docname + '.' + entry
  13         return self._library._filectx(path, \
  14             self._revision.hgrev()).data()
  15
  16     def quickwrite(self, entry, data, msg, user=None):
  17         user = user or self.owner
  18         if user is None:
  19             raise ValueError("Can't determine user.")
  20
  21         def write(l, r):
  22             f = l._fileopen(r(entry), "w+")
  23             f.write(data)
  24             f.close()
  25             l._fileadd(r(entry))
  26
  27         return self.invoke_and_commit(write, lambda d: (msg, user))
  28
  29     def invoke_and_commit(self, ops, before_commit):
  30         lock = self._library._lock()
  31         try:
  32             self._library._checkout(self._revision.hgrev())
  33
  34             def entry_path(entry):
  35                 return self.id + '.' + entry
  36
  37             ops(self._library, entry_path)
  38             message, user = before_commit(self)
  39             self._library._commit(message, user)
  40
  41             return self._library.document(docid=self.id, user=self.owner)
  42         finally:
  43             lock.release()
  44
  45     # def commit(self, message, user):
  46     #    """Make a new commit."""
  47     #    self.invoke_and_commit(message, user, lambda *a: True)
  48
  49     def ismain(self):
  50         return self._revision.user_name() is None
  51
  52     def shared(self):
  53         if self.ismain():
  54             return self
  55         return self._library.document(docid=self._revision.document_name())
  56
  57
  58     def take(self, user):
  59         fullid = self._library.fulldocid(self.id, user)
  60
  61         def take_action(library, resolve):
  62             # branch from latest
  63             library._create_branch(fullid, parent=self._revision)
  64
  65         if not self._library.has_revision(fullid):
  66             self.invoke_and_commit(take_action, \
  67                 lambda d: ("$AUTO$ File checkout.", user) )
  68
  69         return self._library.document_for_rev(fullid)
  70
  71     def update(self, user):
  72         """Update parts of the document."""
  73         lock = self.library._lock()
  74         try:
  75             if self.ismain():
  76                 # main revision of the document
  77                 return True
  78
  79             if self._revision.has_children():
  80                 # can't update non-latest revision
  81                 return False
  82
  83             sv = self.shared()
  84
  85             if not sv.ancestorof(self) and not self.parentof(sv):
  86                 self._revision.merge_with(sv._revision, user=user)
  87
  88             return True
  89         finally:
  90             lock.release()
  91
  92     def share(self, message):
  93         lock = self.library._lock()
  94         try:
  95             if self.ismain():
  96                 return True # always shared
  97
  98             user = self._revision.user_name()
  99
 100             main = self.shared()._revision
 101             local = self._revision
 102
 103             no_changes = True
 104
 105             # Case 1:
 106             #         * local
 107             #         |
 108             #         * <- can also be here!
 109             #        /|
 110             #       / |
 111             # main *  *
 112             #      |  |
 113             # The local branch has been recently updated,
 114             # so we don't need to update yet again, but we need to
 115             # merge down to default branch, even if there was
 116             # no commit's since last update
 117
 118             if main.ancestorof(local):
 119                 print "case 1"
 120                 main.merge_with(local, user=user, message=message)
 121                 no_changes = False
 122             # Case 2:
 123             #
 124             # main *  * local
 125             #      |\ |
 126             #      | \|
 127             #      |  *
 128             #      |  |
 129             #
 130             # Default has no changes, to update from this branch
 131             # since the last merge of local to default.
 132             elif local.has_common_ancestor(main):
 133                 print "case 2"
 134                 if not local.parentof(main):
 135                     main.merge_with(local, user=user, message=message)
 136                     no_changes = False
 137
 138             # Case 3:
 139             # main *
 140             #      |
 141             #      * <- this case overlaps with previos one
 142             #      |\
 143             #      | \
 144             #      |  * local
 145             #      |  |
 146             #
 147             # There was a recent merge to the defaul branch and
 148             # no changes to local branch recently.
 149             #
 150             # Use the fact, that user is prepared to see changes, to
 151             # update his branch if there are any
 152             elif local.ancestorof(main):
 153                 print "case 3"
 154                 if not local.parentof(main):
 155                     local.merge_with(main, user=user, message='Local branch update.')
 156                     no_changes = False
 157             else:
 158                 print "case 4"
 159                 local.merge_with(main, user=user, message='Local branch update.')
 160                 local = self.shelf()
 161                 main.merge_with(local, user=user, message=message)
 162
 163             print "no_changes: ", no_changes
 164             return no_changes
 165         finally:
 166             lock.release()
 167
 168     def __str__(self):
 169         return u"Document(%s:%s)" % (self.name, self.owner)
 170
 171     def __eq__(self, other):
 172         return (self._revision == other._revision) and (self.name == other.name)
 173