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https://issues.apache.org/jira/browse/LOG4J2-1685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15658069#comment-15658069
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Gary Gregory commented on LOG4J2-1685:
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Hi All,
I added the {{noConsoleNoAnsi}} option to workaround a Java feature that in
some environments, the console is null but you can still use
{{System.out.println(...)}}. So you do not really have a console. In Eclipse
for example, you can enable ANSI logging but you'll get gobbledygook characters
on the Eclipse Console View. So {{noConsoleNoAnsi}} let's you work around that
and output non-ANSI text. But, you can also install an ANSI console plugin in
Eclipse, as a way to actually SEE the colors properly. So... it's a bit
complicated of a situation and there you have it ;-)
For this ticket it sounds like we want to have ANSI in patterns but just get
rid of 'em based on a toggle, somewhere.
I think you can already achieve this with our new feature in 2.7 using
configuration Scripts. See
https://logging.apache.org/log4j/2.x/manual/configuration.html#Scripts
Looking at the patch, I see that the implementation of {{disableAnsi}}
parallels {{noConsoleNoAnsi}}.
I do not see an example use case though in the form of a configuration file. So
here is an example:
{code:xml}
<PatternLayout noConsoleNoAnsi="true" disableAnsi="true"
pattern="%style{%d}{white} %style{[%t]}{blue} %style{%-5level:}{yellow}
%style{%msg%n%throwable{short}}{green}" />
{code}
I guess that would work and you could base the value of {{disableAnsi}} on a
system property.
For good or bad, the patch contains a LOT of changes and some BC breaks for
some plugins like {{ScriptPatternSelector}}, but that's just they way it has to
be. I recall having made a lot of changes for {{noConsoleNoAnsi}} as well. I
wish there was a way to refactor all of this to be less intrusive.
I know that we do not make any hard guarantees WRT 100% BC in the
{{log4j-core}} module, but we also try to avoid putting our users in jar hell
as much as possible. That said, I wonder if we should switch some of the
plugins to the builder pattern BEFORE applying this patch so that the changes
would be a perhaps cleaner. This would avoid SOME BC breaks.
The builder pattern would be applied to:
- {{ScriptPatternSelector}}
- {{MarkerPatternSelector}}
- {{PatternLayout.Builder}} does not have a {{disableAnsi}} but it DOES have a
{{noConsoleNoAnsi}}. Is that a bug/omission?
There would still some BC breaks, but fewer. We could probably use the builder
pattern to some non-plugin classes and further minimize BC breaks. For example,
to avoid BC breaks in {{PatternLayout.createSerializer(Configuration,
RegexReplacement, String, String, PatternSelector, boolean, boolean)}}.
Yeah, now that I think about it, I really like the idea of using builders to
minimize BC breaks.
Thoughts?
Gary
> Single property to disable all color output
> -------------------------------------------
>
> Key: LOG4J2-1685
> URL: https://issues.apache.org/jira/browse/LOG4J2-1685
> Project: Log4j 2
> Issue Type: Improvement
> Components: Appenders
> Affects Versions: 2.7
> Reporter: Raman Gupta
> Assignee: Mikael Ståldal
> Priority: Minor
>
> I am deploying an app to a Windows server. The app will write logs to
> standard output which will then be captured by some wrapper process.
> My default configuration contains ansi escapes for color, because they are
> nice for every situation except this one.
> It would be nice if there was a simple way to disable all ansi output via a
> system property and/or environment variable e.g.
> `-Dlog4j.ansi.enabled=false`
> This would operate similarly to the Spring Boot `spring.output.ansi.enabled`
> property
> (http://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-logging.html).
> In Spring Boot I believe this is handled by using conditionals in their
> logback configuration (which would be super-nice in log4j also). With
> conditional layout I could very easily do this myself by specifying two
> different Pattern layouts in my config file, one with color and one without,
> conditional on some system property or env var I define.
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