[PATCH 1 of 4] latesttag: make latesttaginfo available as a global function

[Gilles Moris]

 mercurial/cmdutil.py |  55 +++++++++++++++++++++++++++++--------------------------
 1 files changed, 29 insertions(+), 26 deletions(-)


# HG changeset patch
# User Gilles Moris <gilles.moris at free.fr>
# Date 1254816828 -7200
# Node ID c900201dd7709e704caac923cab31f423816afcd
# Parent  c777835db6a7b00fbcb255f9d467b331bd97b533
latesttag: make latesttaginfo available as a global function

diff --git a/mercurial/cmdutil.py b/mercurial/cmdutil.py
--- a/mercurial/cmdutil.py
+++ b/mercurial/cmdutil.py
@@ -734,6 +734,33 @@
         return parents
 
 
+def latesttaginfo(repo, rev, latesttagcache):
+    '''return date, distance and name for the latest tag of rev
+       function is reentrant and latesttagcache should be initialized with
+       {-1: (0, 0, 'null')}
+    '''
+    todo = [rev]
+    while todo:
+        rev = todo.pop()
+        if rev in latesttagcache:
+            continue
+        ctx = repo[rev]
+        tags = [t for t in ctx.tags() if repo.tagtype(t) == 'global']
+        if tags:
+            latesttagcache[rev] = ctx.date()[0], 0, ':'.join(sorted(tags))
+            continue
+        try:
+            # The tuples are laid out so the right one can be found by comparison.
+            pdate, pdist, ptag = max(
+                latesttagcache[p.rev()] for p in ctx.parents())
+        except KeyError:
+            # Cache miss - recurse
+            todo.append(rev)
+            todo.extend(p.rev() for p in ctx.parents())
+            continue
+        latesttagcache[rev] = pdate, pdist + 1, ptag
+    return latesttagcache[rev]
+
 class changeset_templater(changeset_printer):
     '''format changeset information.'''
 
@@ -765,30 +792,6 @@
             return []
         return parents
 
-    def _latesttaginfo(self, rev):
-        '''return date, distance and name for the latest tag of rev'''
-        todo = [rev]
-        while todo:
-            rev = todo.pop()
-            if rev in self._latesttagcache:
-                continue
-            ctx = self.repo[rev]
-            tags = [t for t in ctx.tags() if self.repo.tagtype(t) == 'global']
-            if tags:
-                self._latesttagcache[rev] = ctx.date()[0], 0, ':'.join(sorted(tags))
-                continue
-            try:
-                # The tuples are laid out so the right one can be found by comparison.
-                pdate, pdist, ptag = max(
-                    self._latesttagcache[p.rev()] for p in ctx.parents())
-            except KeyError:
-                # Cache miss - recurse
-                todo.append(rev)
-                todo.extend(p.rev() for p in ctx.parents())
-                continue
-            self._latesttagcache[rev] = pdate, pdist + 1, ptag
-        return self._latesttagcache[rev]
-
     def _show(self, ctx, copies, props):
         '''show a single changeset or file revision'''
 
@@ -907,9 +910,9 @@
             return '%s: +%s/-%s' % (files, adds, removes)
 
         def showlatesttag(**args):
-            return self._latesttaginfo(ctx.rev())[2]
+            return latesttaginfo(self.repo, ctx.rev(), self._latesttagcache)[2]
         def showlatesttagdistance(**args):
-            return self._latesttaginfo(ctx.rev())[1]
+            return latesttaginfo(self.repo, ctx.rev(), self._latesttagcache)[1]
 
         defprops = {
             'author': ctx.user(),