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util: add a way to issue deprecation warning without a UI object...
util: add a way to issue deprecation warning without a UI object Our current deprecation warning mechanism relies on ui object. They are case where we cannot have access to the UI object. On a general basis we avoid using the python mechanism for deprecation warning because up to Python 2.6 it is exposing warning to unsuspecting user who cannot do anything to deal with them. So we build a "safe" strategy to hide this warnings behind a flag in an environment variable. The test runner set this flag so that tests show these warning. This will help us marker API as deprecated for extensions to update their code.
Augie Fackler - - Load All Authors

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pager.txt
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Some Mercurial commands 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, the pager extensions uses the environment variable
$PAGER. If neither pager.pager, nor $PAGER is set, a default pager
will be used, typically `more`.
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::
[pager]
enable = false
which will prevent the pager from running.