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# pager.py - display output using a pager
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#
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# Copyright 2008 David Soria Parra <dsp@php.net>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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#
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# To load the extension, add it to your configuration file:
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#
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# [extension]
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# pager =
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#
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# Run "hg help pager" to get info on configuration.
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'''browse command output with an external pager
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To set the pager that should be used, set the application variable::
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[pager]
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pager = less -FRX
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If no pager is set, the pager extensions uses the environment variable
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$PAGER. If neither pager.pager, nor $PAGER is set, no pager is used.
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You can disable the pager for certain commands by adding them to the
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pager.ignore list::
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[pager]
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ignore = version, help, update
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You can also enable the pager only for certain commands using
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pager.attend. Below is the default list of commands to be paged::
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[pager]
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attend = annotate, cat, diff, export, glog, log, qdiff
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Setting pager.attend to an empty value will cause all commands to be
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paged.
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If pager.attend is present, pager.ignore will be ignored.
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Lastly, you can enable and disable paging for individual commands with
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the attend-<command> option. This setting takes precedence over
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existing attend and ignore options and defaults::
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[pager]
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attend-cat = false
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To ignore global commands like :hg:`version` or :hg:`help`, you have
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to specify them in your user configuration file.
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The --pager=... option can also be used to control when the pager is
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used. Use a boolean value like yes, no, on, off, or use auto for
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normal behavior.
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'''
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import atexit, sys, os, signal, subprocess
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from mercurial import commands, dispatch, util, extensions, cmdutil
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from mercurial.i18n import _
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# Note for extension authors: ONLY specify testedwith = 'internal' for
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# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
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# be specifying the version(s) of Mercurial they are tested with, or
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# leave the attribute unspecified.
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testedwith = 'internal'
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def _runpager(ui, p):
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pager = subprocess.Popen(p, shell=True, bufsize=-1,
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close_fds=util.closefds, stdin=subprocess.PIPE,
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stdout=sys.stdout, stderr=sys.stderr)
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stdoutfd = os.dup(sys.stdout.fileno())
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stderrfd = os.dup(sys.stderr.fileno())
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os.dup2(pager.stdin.fileno(), sys.stdout.fileno())
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if ui._isatty(sys.stderr):
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os.dup2(pager.stdin.fileno(), sys.stderr.fileno())
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@atexit.register
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def killpager():
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if util.safehasattr(signal, "SIGINT"):
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signal.signal(signal.SIGINT, signal.SIG_IGN)
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pager.stdin.close()
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os.dup2(stdoutfd, sys.stdout.fileno())
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os.dup2(stderrfd, sys.stderr.fileno())
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pager.wait()
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def uisetup(ui):
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if '--debugger' in sys.argv or not ui.formatted():
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return
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def pagecmd(orig, ui, options, cmd, cmdfunc):
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p = ui.config("pager", "pager", os.environ.get("PAGER"))
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usepager = False
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always = util.parsebool(options['pager'])
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auto = options['pager'] == 'auto'
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if not p:
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pass
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elif always:
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usepager = True
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elif not auto:
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usepager = False
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else:
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attend = ui.configlist('pager', 'attend', attended)
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ignore = ui.configlist('pager', 'ignore')
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cmds, _ = cmdutil.findcmd(cmd, commands.table)
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for cmd in cmds:
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var = 'attend-%s' % cmd
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if ui.config('pager', var):
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usepager = ui.configbool('pager', var)
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break
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if (cmd in attend or
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(cmd not in ignore and not attend)):
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usepager = True
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break
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setattr(ui, 'pageractive', usepager)
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if usepager:
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ui.setconfig('ui', 'formatted', ui.formatted(), 'pager')
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ui.setconfig('ui', 'interactive', False, 'pager')
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if util.safehasattr(signal, "SIGPIPE"):
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signal.signal(signal.SIGPIPE, signal.SIG_DFL)
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_runpager(ui, p)
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return orig(ui, options, cmd, cmdfunc)
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# Wrap dispatch._runcommand after color is loaded so color can see
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# ui.pageractive. Otherwise, if we loaded first, color's wrapped
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# dispatch._runcommand would run without having access to ui.pageractive.
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def afterloaded(loaded):
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extensions.wrapfunction(dispatch, '_runcommand', pagecmd)
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extensions.afterloaded('color', afterloaded)
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def extsetup(ui):
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commands.globalopts.append(
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('', 'pager', 'auto',
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_("when to paginate (boolean, always, auto, or never)"),
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_('TYPE')))
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attended = ['annotate', 'cat', 'diff', 'export', 'glog', 'log', 'qdiff']
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