view mercurial/helptext/pager.txt @ 49208:2fe4efaa59af stable

worker: adapt _blockingreader to work around a python3.8.[0-1] bug (issue6444)

Python 3.8.0 is the latest I can load on Ubuntu 18.04, and I regularly hit the
TypeError because this function is missing.  While it can be avoided by
disabling worker usage via config option, that's a bit obscure.

I'm limiting the function definition to the narrow range of affected pythons
because there were other bugs in this area that were worked around, that I don't
fully understand.  See the bug report for discussions on why the narrow range,
and related commits working around other bugs.

Differential Revision: https://phab.mercurial-scm.org/D12627

Some Mercurial commands can produce a lot of output, and Mercurial will
attempt to use a pager to make those commands more pleasant.

To set the pager that should be used, set the application variable::

  [pager]
  pager = less -FRX

If no pager is set in the user or repository configuration, Mercurial uses the
environment variable $PAGER. If $PAGER is not set, pager.pager from the default
or system configuration is used. If none of these are set, a default pager will
be used, typically `less` on Unix and `more` on Windows.

.. container:: windows

  On Windows, `more` is not color aware, so using it effectively disables color.
  MSYS and Cygwin shells provide `less` as a pager, which can be configured to
  support ANSI color codes.  See :hg:`help config.color.pagermode` to configure
  the color mode when invoking a pager.

You can disable the pager for certain commands by adding them to the
pager.ignore list::

  [pager]
  ignore = version, help, update

To ignore global commands like :hg:`version` or :hg:`help`, you have
to specify them in your user configuration file.

To control whether the pager is used at all for an individual command,
you can use --pager=<value>:

  - use as needed: `auto`.
  - require the pager: `yes` or `on`.
  - suppress the pager: `no` or `off` (any unrecognized value
    will also work).

To globally turn off all attempts to use a pager, set::

  [ui]
  paginate = never

which will prevent the pager from running.