How to call a scala method from build.gradle file - scala

Question

I have just started working on the scala and gradle. I want to know how we can call any scala method from the gradle build file. Can somebody please help me?
From comment: I want to run multiple files present in a directory. So in order to get all the files in the directory, I have written a method in scala. That method I am trying to call from build.gradle file

Answer 1

Gradle allows to specify dependencies of build script itself inside buildscript{ dependencies { ... } } (not to be confused with project dependencies inside ordinary dependencies { ... }).
For example here I added Shapeless dependency and used an HList in build.gradle
build.gradle
buildscript{
dependencies {
classpath group: 'com.chuusai', name: 'shapeless_2.13', version: '2.4.0-M1'
}
}
plugins {
id 'java'
id 'scala'
id 'application'
}
group 'org.example'
version '1.0-SNAPSHOT'
repositories {
mavenCentral()
}
dependencies {
testCompile group: 'junit', name: 'junit', version: '4.12'
// compile group: ...
}
application {
mainClassName = 'App'
}
import shapeless.*
task hello {
doLast {
HList l = new $colon$colon(1, new $colon$colon("a", new HNil$()))
println l
}
}
Terminal
$ ./gradlew hello
Output
> Task :hello
1 :: a :: HNil
BUILD SUCCESSFUL in 457ms
1 actionable task: 1 executed
So you can compile your Scala sources, package classes into jar, publish it locally and specify your local dependency in
buildscript{
dependencies {
classpath group: 'yourOrganization', name: 'yourArtifact', version: 'yourVersion'
}
}
and then call methods from your Scala code in build.gradle.