Gradle for an Antlr4, Scala project. Can generate Eclipse files, too.

build.gradle

apply plugin: 'java'
apply plugin: 'scala'
apply plugin: 'eclipse'
apply plugin: 'application'

apply plugin: 'me.champeau.gradle.antlr4'

buildscript {
    repositories {
        maven {
            name 'JFrog OSS snapshot repo'
            url  'https://oss.jfrog.org/oss-snapshot-local/'
        }
        jcenter()
    }

    dependencies {
        classpath 'me.champeau.gradle:antlr4-gradle-plugin:0.1'
    }
}

repositories {
    jcenter()
}

dependencies {
    compile 'org.scala-lang:scala-library:2.11.1'

    // Runtime only needs antlr4-runtime, not the whole antlr4.
    compile 'org.antlr:antlr4-runtime:4.5'

    // Customise antlr4 version, for buildscript
    antlr4 'org.antlr:antlr4:4.5'
}

// Have Gradle/Antlr4 use the same output folder as Maven
// so that it plays nicely with Eclipse.
antlr4.output = new File("target/generated-sources/antlr4")

// make the Java compile task depend on the antlr4 task
compileJava.dependsOn antlr4

// add the generated source files to the list of java sources
sourceSets.main.java.srcDirs += antlr4.output

While I'm sure this isn't idiomatic Gradle, I don't know what would be. I know that this works well enough for my purposes.

It can generate Eclipse project files. A gradle antlr4 is needed, though, after a gradle clean.

Antlr4 generated src went to build/generated-src.
Generated classes to bin.