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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 -FRSX
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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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If you notice "BROKEN PIPE" error messages, you can disable them by
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setting::
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[pager]
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quiet = True
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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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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 sys, os, signal, shlex, errno
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from mercurial import commands, dispatch, util, extensions
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from mercurial.i18n import _
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def _runpager(p):
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if not util.safehasattr(os, 'fork'):
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sys.stdout = util.popen(p, 'wb')
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if util.isatty(sys.stderr):
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sys.stderr = sys.stdout
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return
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fdin, fdout = os.pipe()
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pid = os.fork()
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if pid == 0:
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os.close(fdin)
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os.dup2(fdout, sys.stdout.fileno())
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if util.isatty(sys.stderr):
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os.dup2(fdout, sys.stderr.fileno())
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os.close(fdout)
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return
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os.dup2(fdin, sys.stdin.fileno())
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os.close(fdin)
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os.close(fdout)
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try:
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os.execvp('/bin/sh', ['/bin/sh', '-c', p])
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except OSError, e:
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if e.errno == errno.ENOENT:
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# no /bin/sh, try executing the pager directly
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args = shlex.split(p)
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os.execvp(args[0], args)
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else:
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raise
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def uisetup(ui):
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if ui.plain() or '--debugger' in sys.argv or not util.isatty(sys.stdout):
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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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if p:
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attend = ui.configlist('pager', 'attend', attended)
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auto = options['pager'] == 'auto'
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always = util.parsebool(options['pager'])
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if (always or auto and
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(cmd in attend or
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(cmd not in ui.configlist('pager', 'ignore') and not attend))):
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ui.setconfig('ui', 'formatted', ui.formatted())
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ui.setconfig('ui', 'interactive', False)
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_runpager(p)
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if ui.configbool('pager', 'quiet'):
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signal.signal(signal.SIGPIPE, signal.SIG_DFL)
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return orig(ui, options, cmd, cmdfunc)
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extensions.wrapfunction(dispatch, '_runcommand', pagecmd)
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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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