# pager.py - display output using a pager

#

# Copyright 2008 David Soria Parra <dsp@php.net>

#

# 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 =

#

import sys, os, signal

from mercurial import dispatch

def uisetup(ui):

    def pagecmd(ui, options, cmd, cmdfunc):

        p = ui.config("pager", "pager", os.environ.get("PAGER"))

        if p and sys.stdout.isatty() and '--debugger' not in sys.argv:

            attend = ui.configlist('pager', 'attend')

            if (cmd in attend or

                (cmd not in ui.configlist('pager', 'ignore') and not attend)):

                sys.stderr = sys.stdout = os.popen(p, "wb")

                if ui.configbool('pager', 'quiet'):

                    signal.signal(signal.SIGPIPE, signal.SIG_DFL)

        return oldrun(ui, options, cmd, cmdfunc)

    oldrun = dispatch._runcommand

    dispatch._runcommand = pagecmd