mercurial/strutil.py

Sometimes pushing to an HTTP repo fails with a useless message.

  abort: 'https://.../.../' does not appear to be an hg repository!

Ought to produce a better diagnostics on the client. With patched 1.3.1,
observed to produce an Apache HTML error message (from cgitb) including the
vital text:

  File ".../hgwebdir.cgi", line 70, in ?
    wsgicgi.launch(application)
  File "mercurial/hgweb/wsgicgi.py", line 68, in launch
  File "mercurial/hgweb/hgwebdir_mod.py", line 91, in __call__
  File "mercurial/hgweb/hgwebdir_mod.py", line 148, in run_wsgi
  File "mercurial/hgweb/hgweb_mod.py", line 100, in run_wsgi
  File "mercurial/hgweb/protocol.py", line 156, in unbundle
  File "mercurial/localrepo.py", line 2031, in addchangegroup
  File "mercurial/revlog.py", line 1204, in addgroup
LookupError: 00manifest.i@......: unknown parent

Might also be helpful if server's hgweb_mod.run_wsgi caught unexpected errors
and returned a well-formed error response including the stack trace. The client
patch would still be useful in this case, because it would let you diagnose
issues with HTTP proxy servers and so on.

# strutil.py - string utilities for Mercurial
#
# Copyright 2006 Vadim Gelfer <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2, incorporated herein by reference.

def findall(haystack, needle, start=0, end=None):
    if end is None:
        end = len(haystack)
    if end < 0:
        end += len(haystack)
    if start < 0:
        start += len(haystack)
    while start < end:
        c = haystack.find(needle, start, end)
        if c == -1:
            break
        yield c
        start = c + 1

def rfindall(haystack, needle, start=0, end=None):
    if end is None:
        end = len(haystack)
    if end < 0:
        end += len(haystack)
    if start < 0:
        start += len(haystack)
    while end >= 0:
        c = haystack.rfind(needle, start, end)
        if c == -1:
            break
        yield c
        end = c - 1