D12140: rank: add context and template keyword

[pacien (Pacien)]

pacien created this revision.
Herald added a reviewer: hg-reviewers.
Herald added a subscriber: mercurial-patches.

REVISION SUMMARY
  This makes the stored rank property accessible, to be expanded and printed.

REPOSITORY
  rHG Mercurial

BRANCH
  default

REVISION DETAIL
  https://phab.mercurial-scm.org/D12140

AFFECTED FILES
  mercurial/context.py
  mercurial/templatekw.py

CHANGE DETAILS

diff --git a/mercurial/templatekw.py b/mercurial/templatekw.py
--- a/mercurial/templatekw.py
+++ b/mercurial/templatekw.py
@@ -304,6 +304,20 @@
     )
 
 
+ at templatekeyword(b'_fast_rank', requires={b'ctx'})
+def fast_rank(context, mapping):
+    """the rank of a changeset if cached
+
+    The rank of a revision is the size of sub-graph it defines as a head. In
+    other words, the rank of X is the size of `ancestors(X)` (X included).
+    """
+    ctx = context.resource(mapping, b'ctx')
+    rank = ctx.fast_rank()
+    if rank is None:
+        return None
+    return b"%d" % rank
+
+
 def _getfilestatus(context, mapping, listall=False):
     ctx = context.resource(mapping, b'ctx')
     revcache = context.resource(mapping, b'revcache')
diff --git a/mercurial/context.py b/mercurial/context.py
--- a/mercurial/context.py
+++ b/mercurial/context.py
@@ -685,6 +685,14 @@
         """Return a list of byte bookmark names."""
         return self._repo.nodebookmarks(self._node)
 
+    def fast_rank(self):
+        repo = self._repo
+        if self._maybe_filtered:
+            cl = repo.changelog
+        else:
+            cl = repo.unfiltered().changelog
+        return cl.fast_rank(self._rev)
+
     def phase(self):
         return self._repo._phasecache.phase(self._repo, self._rev)
 



To: pacien, #hg-reviewers
Cc: mercurial-patches, mercurial-devel