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https://issues.apache.org/jira/browse/GROOVY-8578?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King updated GROOVY-8578:
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Fix Version/s: (was: 2.5.0-rc-3)
> Add errorWriter property to commons-cli CliBuilder
> --------------------------------------------------
>
> Key: GROOVY-8578
> URL: https://issues.apache.org/jira/browse/GROOVY-8578
> Project: Groovy
> Issue Type: Improvement
> Components: command line processing
> Reporter: Remko Popma
> Priority: Major
>
> This ticket proposes to modify the commons-cli version of CliBuilder, so that
> it also has an {{errorWriter}} property that works similar to the picocli
> version of CliBuilder.
> h3. Description of Functionality
> The picocli version of CliBuilder has an {{errorWriter}} property
> ({{System.err}} by default) that is used to print the error message and usage
> help to when the user provided invalid input on the command line. This
> prevents error messages from inadvertently being parsed by another program
> when the output of a groovy program is piped to another program.
> The previously existing {{writer}} property is used when the user requests
> help with {{--help}} or {{--version}}. This allows users to pipe the output
> of the help request to {{less}} or {{grep}} or another utility.
> h3. Motivation
> * This is a good feature in general (follow conventions for command line
> applications)
> * It makes the commons-cli version and the picocli version of CliBuilder
> more consistent with each other.
> I can raise a PR if there is interest.
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