Jan Høydahl created SOLR-18512:
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             Summary: Port ConfigTool to PicoCli
                 Key: SOLR-18512
                 URL: https://issues.apache.org/jira/browse/SOLR-18512
             Project: Solr
          Issue Type: Improvement
          Components: cli
            Reporter: Jan Høydahl


Port {{ConfigTool}} to picocli, adding the picocli code path alongside the 
existing commons-cli one.

*Covers:* {{bin/solr config}}

The command invokes the Config API against the collection named by {{\-c}} / 
{{\-\-name}}, with {{\-\-action}} selecting one of {{set-property}}, 
{{unset-property}}, {{set-user-property}} or {{unset-user-property}} (default 
{{set-property}}), and {{\-\-property}} / {{\-\-value}} carrying the payload. 
There are no sub-commands.

Consider modelling {{\-\-action}} as a picocli enum so the valid values are 
validated and documented by the framework rather than by hand.

*Acceptance criteria*
* {{bin/solr config}} and all its options work with {{SOLR_PICOCLI=true}}, and 
the commons-cli path is left behaviourally unchanged.
* {{ConfigTool}} is registered in {{SolrCLI}}'s picocli {{subcommands}} list 
and {{ToolBase.callTool()}} is implemented, replacing the 
{{UnsupportedOperationException}} stub.
* Shared options reuse the existing mixins ({{ConnectionOptions}}, 
{{CredentialsOptions}}, {{HelpMixin}}) rather than redeclaring them.
* An {{ConfigToolPicocliTest}} subclasses the existing test and overrides only 
the {{runTool}} hook, so the inherited assertions run through both parsers.
* {{./gradlew :solr:solr-ref-guide:generateCliDocs}} is re-run and the 
generated {{cli/solr-config.adoc}} page is committed, so 
{{checkCliDocsUpToDate}} passes.

*AI assistance:* a coding-agent prompt template encoding the patterns already 
established by the ported tools is available at 
[https://gist.github.com/janhoy/a3fe0dbcaadf24b3493558946cc549d9] — name 
{{ConfigTool}} in its Assignment line up front and the rest of the prompt 
adapts. Please review agent output as carefully as hand-written code.



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