Code completion package names in custom language plugin

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Is ist possible to get code completion for package names in a custom language plugin?

 

Thanks for your help

Marcel

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Official comment

Of course. CompletionContributor javadoc describes how to add completion, and JavaPsiFacade#findPackage and PsiPackage#getChildren can help you generate the variants.

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Thank you very much Peter.

 

I already have a completion contributor implemented in my plugin and added some keywords, which popup.

Do you have an example for me how to get the package names of a project and how I add these to my completion contributor?

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