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a: send ui.log() data to a subprocess (EXPERIMENTAL)
This extension lets you specify a shell command per ui.log() event,
sending all remaining arguments to as environment variables to that command.
Positional arguments construct a log message, which is passed in the `MSG1`
environment variables. Each keyword argument is set as a `OPT_UPPERCASE_KEY`
variable (so the key is uppercased, and prefixed with `OPT_`). The original
event name is passed in the `EVENT` environment variable, and the process ID
of mercurial is given in `HGPID`.
So given a call `ui.log('foo', 'bar %s
', 'baz', spam='eggs'), a script
configured for the `foo` event can expect an environment with `MSG1=bar baz`,
and `OPT_SPAM=eggs`.
Scripts are configured in the `[logtoprocess]` section, each key an event name.
For example::
[logtoprocess]
commandexception = echo "$MSG1" > /var/log/mercurial_exceptions.log
would log the warning message and traceback of any failed command dispatch.
Scripts are run asynchronously as detached daemon processes; mercurial will
not ensure that they exit cleanly.
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