annotate hgext/pager.py @ 6858:8f256bf98219

Add support for multiple possible bisect results (issue1228, issue1182)

The real reason for both issue is that bisect can not handle cases where there
are multiple possibilities for the result.

Example (from issue1228):
rev 0 -> good
rev 1 -> skipped
rev 2 -> skipped
rev 3 -> skipped
rev 4 -> bad

Note that this patch does not only fix the reported Assertion Error but also
the problem of a non converging bisect:

hg init
for i in `seq 3`; do echo $i > $i; hg add $i; hg ci -m$i; done
hg bisect -b 2
hg bisect -g 0
hg bisect -s

From this state on, you can:
 a) mark as bad forever (non converging!)
 b) mark as good to get an inconsistent state
 c) skip for the Assertion Error

Minor description and code edits by pmezard.

# pager.py - display output using a pager
#
# Copyright 2008 David Soria Parra <[e-mail]>
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.
#
# To load the extension, add it to your .hgrc file:
#
#   [extension]
#   hgext.pager =
#
# To set the pager that should be used, set the application variable:
#
#   [pager]
#   pager = LESS='FSRX' less
#
# If no pager is set, the pager extensions uses the environment
# variable $PAGER. If neither pager.pager, nor $PAGER is set, no pager
# is used.
#
# If you notice "BROKEN PIPE" error messages, you can disable them
# by setting:
#
#   [pager]
#   quiet = True

import sys, os, signal

def uisetup(ui):
    p = ui.config("pager", "pager", os.environ.get("PAGER"))
    if p and sys.stdout.isatty() and '--debugger' not in sys.argv:
        if ui.configbool('pager', 'quiet'):
            signal.signal(signal.SIGPIPE, signal.SIG_DFL)
        sys.stderr = sys.stdout = os.popen(p, "wb")