scripts/chg-len.py
author Peter Kovacs <kpeter@inf.elte.hu>
Fri, 03 Apr 2009 18:59:15 +0200
changeset 655 6ac5d9ae1d3d
parent 390 4b2382fd80ef
child 780 abf31e4af617
permissions -rwxr-xr-x
Support real types + numerical stability fix in NS (#254)

- Real types are supported by appropriate inicialization.
- A feature of the XTI spanning tree structure is removed to ensure
numerical stability (could cause problems using integer types).
The node potentials are updated always on the lower subtree,
in order to prevent overflow problems.
The former method isn't notably faster during to our tests.
     1 #! /usr/bin/env python
     2 
     3 import sys
     4 
     5 from mercurial import ui, hg
     6 from mercurial import util
     7 
     8 util.rcpath = lambda : []
     9 
    10 if len(sys.argv)>1 and sys.argv[1] in ["-h","--help"]:
    11     print """
    12 This utility just prints the length of the longest path
    13 in the revision graph from revison 0 to the current one.
    14 """
    15     exit(0)
    16 
    17 u = ui.ui()
    18 r = hg.repository(u, ".")
    19 N = r.changectx(".").rev()
    20 lengths=[0]*(N+1)
    21 for i in range(N+1):
    22     p=r.changectx(i).parents()
    23     if p[0]:
    24         p0=lengths[p[0].rev()]
    25     else:
    26         p0=-1
    27     if len(p)>1 and p[1]:
    28         p1=lengths[p[1].rev()]
    29     else:
    30         p1=-1
    31     lengths[i]=max(p0,p1)+1
    32 print lengths[N]