jknazko/arrow-meta-examples

Some examples for Λrrow Meta the functional companion to Kotlin's Compiler & IDE.

Λrrow Meta examples

Some examples for Λrrow Meta the functional companion to Kotlin's Compiler & IDE.

Hello World Compiler Plugin

The following example shows a Hello World Compiler Plugin. The Hello World plugin auto implements the helloWorld function by rewriting the Kotlin AST before the compiler proceeds.

val Meta.helloWorld: CliPlugin
  get() =
    "Hello World" {
      meta(
        namedFunction({ name == "helloWorld" }) { c ->
          Transform.replace(
            replacing = c,
            newDeclaration =
            """|fun helloWorld(): Unit =
               |  println("Hello ΛRROW Meta!")
               |""".function.synthetic
          )
        }
      )
    }

For any user code whose function name is helloWorld our compiler plugin will replace the matching function for a function that returns Unit and prints our message.

- fun helloWorld(): Unit = TODO()
+ fun helloWorld(): Unit =
+   println("Hello ΛRROW Meta!")

How to run it from IDE

1. Create a new project from existing sources: hello-world directory
2. Open use-plugin/src/main/kotlin/io/arrowkt/example/HelloWorld.kt
3. Run main function

How to run it from command line

cd hello-world
./gradlew clean :use-plugin:shadowJar
java -jar use-plugin/build/libs/use-plugin-all.jar

Hello World Compiler + IDE Plugin

Stay tuned!

Use of Λrrow Meta Compiler Plugin

Λrrow Meta Compiler Plugin can be used through Λrrow Meta Gradle Plugin.

How to run it from IDE

1. Create a new project from existing sources: use-arrow-meta-compiler-plugin directory
2. Build project to run the test

How to run it from command line

cd use-arrow-meta-compiler-plugin
./gradlew clean build

License

Copyright (C) 2019 The Λrrow Authors

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.