Migrating DevKit Plugin to Gradle
Converting a plugin created with the old DevKit approach (which can be used for creating themes) to a Gradle-based plugin project can be done using the New Project wizard to create a Gradle-based project around the existing DevKit-based project:
Ensure the directory containing the DevKit-based IntelliJ Platform plugin project can be fully recovered if necessary.
Delete all the artifacts of the DevKit-based project:
Arrange the existing source files within the project directory in the Gradle source set format.
Use the New Project wizard as though creating a new Gradle-based plugin project from scratch. On the New Project page choose the IDE Plugin generator and set the values of:
Group to the existing package in the initial source set.
Artifact to the name of the existing plugin.
Name to the name of the directory where the existing plugin is located, e.g. if the plugin project base directory is /Users/john/Projects/old_plugin, it should be the old_plugin.
Location to the name of the plugin's parent directory, e.g. if the plugin project base directory is /Users/john/Projects/old_plugin, it should be the /Users/john/Projects.
Click Finish to create the new Gradle-based plugin.