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debugcommands: introduce actions to perform deterministic reads
"readavailable" is useful as a debugging device to see what data is
available on a pipe. But the mechanism isn't deterministic because
what's available on a pipe is highly conditional on timing, system
load, OS behavior, etc. This makes it not suitable for tests.
We introduce "ereadline," "read," and "eread" for performing
deterministic I/O operations (at least on blocking file descriptors).
We stop short of converting existing consumers of "readavailable"
in tests because we're working out race conditions and deadlocks
on Windows. But the goal is to eventually move tests away from
"readavailable" to these new APIs.
Differential Revision: https://phab.mercurial-scm.org/D2720
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Mon, 12 Mar 2018 15:49:02 -0700 |
parents | 85b978031a75 |
children |
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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.