Paul Benedict created MPH-152:
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Summary: Enhance console output of "evaluate" goal to indicate
result
Key: MPH-152
URL: https://issues.apache.org/jira/browse/MPH-152
Project: Maven Help Plugin
Issue Type: Improvement
Components: evaluate
Affects Versions: 3.0.1
Reporter: Paul Benedict
I have two requirements for consideration:
# Scripts should be able to easily get the resolution status.
# Scripts should be able to easily get the resolved expression value.
When evaluating an expression, the output does not have a good marker to help
scripts identity the resolution. Current plugin behavior prints the value
(practically buried among Maven's logging) or "null object or invalid
expression" message.
The {{-o}} option could be used, of course, but file creation is more overhead
than necessary. But what is good about the {{-o}} option is that it prints a
clear marker:
{code:none}
> mvn help:evaluate -Dexpression=settings.localRepository -Doutput=out.txt
[INFO] Scanning for projects...
. . .
[INFO] Result of evaluation written to: c:\proj\out.txt{code}
Can you consider something similar for the console?
Example possible solutions:
{code:none}
> mvn help:evaluate -Dexpression=settings.localRepository
[INFO] Scanning for projects...
. . .
[INFO] Result of evaluation: /home/joeuser/.m2/repository{code}
And again:
{code:none}
> mvn help:evaluate -Dexpression=zzz
[INFO] Scanning for projects...
. . .
[INFO] Result of evaluation: null{code}
PS: If you think current behavior should be preserved, a new plugin option can
be introduced. However, as [shown by this
link|https://stackoverflow.com/questions/5916157/how-to-get-the-maven-local-repo-location],
I think people have a difficult time clobbering together an answer to parse
reliably. There are other examples on that site if you're interested. So I
don't think any effort should be taken with introducing a new option. Just my 2
cents. Since the fragility already exists, just provide an "official" solution
to remediate it.
Thank you.
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