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kotlinlang

For a moment there are two ways to get an IDEA support for your custom scripts
 1. (more or less stable) implement `scriptTemplatesProvider` extension in your own IDEA plugin, the same way as it is done with `GradleScriptTemplatesProvider`
2. (quite experimental) use “Script Template Classes/Classpath” settings (kotlin compiler)”  available in latest dev builds. 
Option 2 could morph or disappear quite soon, so use it on your own risk.
An any case I recommend nightly builds for experiments with that.