Introduction: Experiment with Kotlin compiler code generation
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An experiment on the idea of Google's Dagger using different means of code generation: Kotlin compiler.

For now I continue working on implementing richer feature-set. Most of the code is generated in frontend using KotlinPoet. IDE support works out of the box (at least for JB products) thanks to gradle integration. As a side effect of this project, I am exploring how DI can be done better using Kotlin (in compile time safe way).

If you, for any reason, want to look through this:

  • The plugin files are in: buildSrc/compiler-plugin/kotlin-plugin (this is what attaches to compiler)
  • The test project files is in src/main/kotlin (this is what gets compiled)

Right now I have implemented the concept of:

  • exposing dependencies through Component.
  • providing them through Module implemented as object or class instance.
  • providing using @Inject annotated constructor
  • inject dependencies into @Inject annotated fields
  • inject dependencies into @Inject annotated functions (one param only)
  • local scoping inside component using @Scope annotations
  • provide external dependencies using @Factory
  • Support of @BindsInstance for components
  • Support for @Qualifier
  • external dependencies through @Builder
  • Default builder
  • Type mapping using @Binds
  • Lazy and Provider support

TODO (in any order):

  • Default module instantiation when class has an empty constructor
  • Reusable support
  • IntoSet / IntoMap
  • Subcomponents
  • Proper scope support
  • ... the rest

To launch test file

Use ./gradlew run. It will build and install plugin to maven local, after it will compile the test project using freshly built plugin and run it. Yay!

Now publishing to gradle plugin portal!

To get the plugin, follow instructions here.

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GitHub: Trinea
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