changeset 29783:2ebd507e5ac3

dirstate: add callback to notify extensions about wd parent change

The journal extension had to touch the dirstate internals to be notified about
wd parent change. To make that detection cleaner and reusable let's move it core.
Now the extension can register to be notified about parent changes.

--- a/mercurial/dirstate.py	Sat Aug 06 20:46:53 2016 +0900
+++ b/mercurial/dirstate.py	Thu Aug 11 08:00:41 2016 -0700
@@ -101,6 +101,8 @@
         self._parentwriters = 0
         self._filename = 'dirstate'
         self._pendingfilename = '%s.pending' % self._filename
+        self._plchangecallbacks = {}
+        self._origpl = None
 
         # for consistent view between _pl() and _read() invocations
         self._pendingmode = None
@@ -347,6 +349,8 @@
 
         self._dirty = self._dirtypl = True
         oldp2 = self._pl[1]
+        if self._origpl is None:
+            self._origpl = self._pl
         self._pl = p1, p2
         copies = {}
         if oldp2 != nullid and p2 == nullid:
@@ -442,6 +446,7 @@
         self._lastnormaltime = 0
         self._dirty = False
         self._parentwriters = 0
+        self._origpl = None
 
     def copy(self, source, dest):
         """Mark dest as a copy of source. Unmark dest if source is None."""
@@ -687,6 +692,8 @@
                 if f in self._nonnormalset:
                     self._nonnormalset.remove(f)
 
+        if self._origpl is None:
+            self._origpl = self._pl
         self._pl = (parent, nullid)
         self._dirty = True
 
@@ -721,7 +728,23 @@
         st = self._opener(filename, "w", atomictemp=True, checkambig=True)
         self._writedirstate(st)
 
+    def addparentchangecallback(self, category, callback):
+        """add a callback to be called when the wd parents are changed
+
+        Callback will be called with the following arguments:
+            dirstate, (oldp1, oldp2), (newp1, newp2)
+
+        Category is a unique identifier to allow overwriting an old callback
+        with a newer callback.
+        """
+        self._plchangecallbacks[category] = callback
+
     def _writedirstate(self, st):
+        # notify callbacks about parents change
+        if self._origpl is not None and self._origpl != self._pl:
+            for c, callback in sorted(self._plchangecallbacks.iteritems()):
+                callback(self, self._origpl, self._pl)
+            self._origpl = None
         # use the modification time of the newly created temporary file as the
         # filesystem's notion of 'now'
         now = util.fstat(st).st_mtime & _rangemask