[PATCH] commands.debugrevlog: report max chain length

[Gregory Szorc]

# HG changeset patch
# User Gregory Szorc <gregory.szorc at gmail.com>
# Date 1427572724 25200
#      Sat Mar 28 12:58:44 2015 -0700
# Node ID 4674d72785291031be6dece42fda214738bb2448
# Parent  efa094701a05d58d505c3b0c3b3c73dba4e51e97
commands.debugrevlog: report max chain length

This is sometimes useful to know. Report it.

diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -2842,8 +2842,9 @@ def debugrevlog(ui, repo, file_=None, **
     if numrevs - numfull > 0:
         deltasize[2] /= numrevs - numfull
     totalsize = fulltotal + deltatotal
     avgchainlen = sum(chainlengths) / numrevs
+    maxchainlen = max(chainlengths)
     compratio = totalrawsize / totalsize
 
     basedfmtstr = '%%%dd\n'
     basepcfmtstr = '%%%dd %s(%%5.2f%%%%)\n'
@@ -2874,8 +2875,9 @@ def debugrevlog(ui, repo, file_=None, **
 
     ui.write('\n')
     fmt = dfmtstr(max(avgchainlen, compratio))
     ui.write(('avg chain length  : ') + fmt % avgchainlen)
+    ui.write(('max chain length  : ') + fmt % maxchainlen)
     ui.write(('compression ratio : ') + fmt % compratio)
 
     if format > 0:
         ui.write('\n')
diff --git a/tests/test-debugcommands.t b/tests/test-debugcommands.t
--- a/tests/test-debugcommands.t
+++ b/tests/test-debugcommands.t
@@ -17,8 +17,9 @@
       full      : 44 (100.00%)
       deltas    :  0 ( 0.00%)
   
   avg chain length  : 0
+  max chain length  : 0
   compression ratio : 0
   
   uncompressed data size (min/max/avg) : 43 / 43 / 43
   full revision size (min/max/avg)     : 44 / 44 / 44