Fail-safe output storage

[ElijahGM]

Decouple Event::emailOutputTo from file system operations (such as file_get_contents in Event::emailOutput)

Original request

The cron seems to run ok, but the emailOutput not being sent upon troubleshooting i find the cron throws an error that the output log file does not exists, yet i have set the log file as follows

$schedule->call(function() {
echo "Wisdom at it caused\n";
echo date("G:i a")."\n";
})->cron('* * * * *')
->sendOutputTo('/var/www/html/test/schedules.log')
->emailOutputTo('[email protected]');

[kstkn]

In current implementation command being built with output directed to some filepath (/dev/null by default)

Like: /usr/local/bin/some-program > /your/output/path

I'm not sure if that's Scheduler responsibility to check if that path exists, but that approach seems not right.

@omnilight, symfony's Process has own methods to handle output. Maybe that way is more convenient.

I also personally think, that emailOutputTo should not depend on sendOutputTo.