hgext/pager.py
author Augie Fackler <augie@google.com>
Mon, 06 Feb 2017 22:52:47 -0500
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permissions -rw-r--r--
annotate: migrate to modern pager API
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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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To control whether the pager is used at all for an individual command,
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you can use --pager=<value>::
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  - use as needed: `auto`.
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  - require the pager: `yes` or `on`.
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  - suppress the pager: `no` or `off` (any unrecognized value
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  will also work).
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'''
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from __future__ import absolute_import
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from mercurial import (
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    cmdutil,
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    commands,
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    dispatch,
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    extensions,
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    )
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# Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' 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 = 'ships-with-hg-core'
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def uisetup(ui):
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    def pagecmd(orig, ui, options, cmd, cmdfunc):
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        auto = options['pager'] == 'auto'
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        if auto and not ui.pageractive:
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            usepager = False
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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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            if usepager:
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                # Slight hack: the attend list is supposed to override
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                # the ignore list for the pager extension, but the
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                # core code doesn't know about attend, so we have to
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                # lobotomize the ignore list so that the extension's
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                # behavior is preserved.
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                ui.setconfig('pager', 'ignore', '', 'pager')
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                ui.pager('extension-via-attend-' + cmd)
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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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attended = ['cat', 'diff', 'export', 'glog', 'log', 'qdiff']