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# 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 version 2 or any later version.
#
# To load the extension, add it to your configuration file:
#
# [extension]
# pager =
#
# Run "hg help pager" to get info on configuration.
'''browse command output with an external pager
To set the pager that should be used, set the application variable::
[pager]
pager = less -FRX
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.
You can disable the pager for certain commands by adding them to the
pager.ignore list::
[pager]
ignore = version, help, update
You can also enable the pager only for certain commands using
pager.attend. Below is the default list of commands to be paged::
[pager]
attend = annotate, cat, diff, export, glog, log, qdiff
Setting pager.attend to an empty value will cause all commands to be
paged.
If pager.attend is present, pager.ignore will be ignored.
To ignore global commands like :hg:`version` or :hg:`help`, you have
to specify them in your user configuration file.
The --pager=... option can also be used to control when the pager is
used. Use a boolean value like yes, no, on, off, or use auto for
normal behavior.
'''
import atexit, sys, os, signal, subprocess
from mercurial import commands, dispatch, util, extensions
from mercurial.i18n import _
testedwith = 'internal'
def _pagerfork(ui, p):
if not util.safehasattr(os, 'fork'):
sys.stdout = util.popen(p, 'wb')
if ui._isatty(sys.stderr):
sys.stderr = sys.stdout
return
fdin, fdout = os.pipe()
pid = os.fork()
if pid == 0:
os.close(fdin)
os.dup2(fdout, sys.stdout.fileno())
if ui._isatty(sys.stderr):
os.dup2(fdout, sys.stderr.fileno())
os.close(fdout)
return
os.dup2(fdin, sys.stdin.fileno())
os.close(fdin)
os.close(fdout)
try:
os.execvp('/bin/sh', ['/bin/sh', '-c', p])
except OSError, e:
if e.errno == errno.ENOENT:
# no /bin/sh, try executing the pager directly
args = shlex.split(p)
os.execvp(args[0], args)
else:
raise
def _pagersubprocess(ui, p):
pager = subprocess.Popen(p, shell=True, bufsize=-1,
close_fds=util.closefds, stdin=subprocess.PIPE,
stdout=sys.stdout, stderr=sys.stderr)
stdout = os.dup(sys.stdout.fileno())
stderr = os.dup(sys.stderr.fileno())
os.dup2(pager.stdin.fileno(), sys.stdout.fileno())
if ui._isatty(sys.stderr):
os.dup2(pager.stdin.fileno(), sys.stderr.fileno())
@atexit.register
def killpager():
pager.stdin.close()
os.dup2(stdout, sys.stdout.fileno())
os.dup2(stderr, sys.stderr.fileno())
pager.wait()
def _runpager(ui, p):
# The subprocess module shipped with Python <= 2.4 is buggy (issue3533).
# The compat version is buggy on Windows (issue3225), but has been shipping
# with hg for a long time. Preserve existing functionality.
if sys.version_info >= (2, 5):
_pagersubprocess(ui, p)
else:
_pagerfork(ui, p)
def uisetup(ui):
if '--debugger' in sys.argv or not ui.formatted():
return
def pagecmd(orig, ui, options, cmd, cmdfunc):
p = ui.config("pager", "pager", os.environ.get("PAGER"))
if p:
attend = ui.configlist('pager', 'attend', attended)
auto = options['pager'] == 'auto'
always = util.parsebool(options['pager'])
if (always or auto and
(cmd in attend or
(cmd not in ui.configlist('pager', 'ignore') and not attend))):
ui.setconfig('ui', 'formatted', ui.formatted())
ui.setconfig('ui', 'interactive', False)
if util.safehasattr(signal, "SIGPIPE"):
signal.signal(signal.SIGPIPE, signal.SIG_DFL)
_runpager(ui, p)
return orig(ui, options, cmd, cmdfunc)
extensions.wrapfunction(dispatch, '_runcommand', pagecmd)
def extsetup(ui):
commands.globalopts.append(
('', 'pager', 'auto',
_("when to paginate (boolean, always, auto, or never)"),
_('TYPE')))
attended = ['annotate', 'cat', 'diff', 'export', 'glog', 'log', 'qdiff']
|
