tests/svn-safe-append.py

generatorset: make it possible to use gen as fastasc or fastdesc

We gain a parameter to inform that the generator is ascending or descending. If
the generator is ordered, it is also used for the `fastasc` or `fastdesc`
version.

The _ascgeneratorset and _descgeneratorset class will be removed soon.

#!/usr/bin/env python

__doc__ = """Same as `echo a >> b`, but ensures a changed mtime of b.
Without this svn will not detect workspace changes."""

import sys, os

text = sys.argv[1]
fname = sys.argv[2]

f = open(fname, "ab")
try:
    before = os.fstat(f.fileno()).st_mtime
    f.write(text)
    f.write("\n")
finally:
    f.close()
inc = 1
now = os.stat(fname).st_mtime
while now == before:
    t = now + inc
    inc += 1
    os.utime(fname, (t, t))
    now = os.stat(fname).st_mtime