[MDL-47395] improve visual cues for cli errors - Moodle Tracker

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Testing Instructions:

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Test: use cli tools. try to get an error and observe that a biggish unicode 'X' , in red on some systems, appears to indicate to admin that cli has output an error

example of cli test run using cli_error() call which puts in the visual cue:
php admin/cli/upgrade.php
❌ No upgrade needed for the installed version 2.8dev (Build: 20140918) (2014091800). Thanks for coming anyway!

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Test: use cli tools. try to get an error and observe that a biggish unicode 'X' , in red on some systems, appears to indicate to admin that cli has output an error example of cli test run using cli_error() call which puts in the visual cue: php admin/cli/upgrade.php ❌ No upgrade needed for the installed version 2.8dev (Build: 20140918) (2014091800). Thanks for coming anyway!
Workaround:

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read the cli text output in detail every time as a meticulous, often overloaded, moodle systems administrator.

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read the cli text output in detail every time as a meticulous, often overloaded, moodle systems administrator.
Affected Branches:
MOODLE_28_STABLE
Pull from Repository:
git://github.com/nebgor/moodle.git
Pull Master Branch:
MDL-47395
Pull Master Diff URL:
https://github.com/nebgor/moodle/compare/moodle:master...MDL-47395

often cli errors are just text which administrators can easily miss. this aims to put a visual cue into cli_error.

note: there is no cli api call for cli_ok() or so...

ps: fwrite(STDERR, "\xF0\x9F\x91\x8E ". $text);

has been marked as being related by

MDL-50631 Display Moodle ASCII logo in CLI installer

Participants:: Aparup Banerjee, CiBoT, Damyon Wiese, Dan Poltawski, Sam Hemelryk

Component watchers:: Andrew Nicols, Jun Pataleta, Michael Hawkins, Shamim Rezaie, Simey Lameze