Support mixed STDOUT/STDERR in Screen Appenders

[bmodotdev]

Currently “Log::Log4perl::Appender::Screen” and “ScreenColoredLevels” only support sending all levels to STDOUT or STDERR. This adds the ability to specify only certain log4p_level’s got to STDERR. The legacy behavior of sending all to STDOUT or STDERR is still supported.

[bmodotdev]

I wrote this feature because I expect $ERROR and greater to go to STDERR and $WARN and lesser go to STDOUT. To me, this is nice for CI/CD so we can have a meaningful capture of STDERR.

So now, the supported configs lines are

# Legacy - all levels to STDOUT
log4perl.appender.Screen.stderr = 0

# Legacy - all levels to STDERR
log4perl.appender.Screen.stderr = 1

# New - only ERROR and FATAL to STDERR, the rest to STDOUT
log4perl.appender.Screen.stderr.ERROR = 1
log4perl.appender.Screen.stderr.FATAL = 1

I also added some testing for both legacy and new behavior here

$ prove -v -I './lib/' t/071ScreenStdoutStderr.t 
t/071ScreenStdoutStderr.t .. 
1..30
ok 1 - debug to stdout
ok 2 - debug to stderr
ok 3 - error to stdout
ok 4 - error to stderr
ok 5 - fatal to stdout
ok 6 - fatal to stderr
ok 7 - info to stdout
ok 8 - info to stderr
ok 9 - warn to stdout
ok 10 - warn to stderr
ok 11 - debug to stdout
ok 12 - debug to stderr
ok 13 - error to stdout
ok 14 - error to stderr
ok 15 - fatal to stdout
ok 16 - fatal to stderr
ok 17 - info to stdout
ok 18 - info to stderr
ok 19 - warn to stdout
ok 20 - warn to stderr
ok 21 - debug to stdout
ok 22 - debug to stderr
ok 23 - error to stdout
ok 24 - error to stderr
ok 25 - fatal to stdout
ok 26 - fatal to stderr
ok 27 - info to stdout
ok 28 - info to stderr
ok 29 - warn to stdout
ok 30 - warn to stderr
ok
All tests successful.
Files=1, Tests=30,  0 wallclock secs ( 0.02 usr  0.01 sys +  0.08 cusr  0.02 csys =  0.13 CPU)
Result: PASS

Let me know if there is already a better way to achieve mixed output or STDERR by level greater than $foo.

Thanks!

[coveralls]

Pull Request Test Coverage Report for Build 2425012954

• 5 of 5 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.05%) to 89.78%

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Totals
Change from base Build 2424937701:	0.05%
Covered Lines:	2372
Relevant Lines:	2642

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💛 - Coveralls

[mohawk2]

Thanks!

[bmodotdev]

Thank you!