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Building a Library

Skotch supports multi-module projects where library modules are compiled before application modules and merged into the final output.

Project structure

myproject/
  settings.gradle.kts
  app/
    build.gradle.kts
    src/main/kotlin/
      Main.kt
  lib/
    build.gradle.kts
    src/main/kotlin/
      MathUtils.kt

`settings.gradle.kts`

rootProject.name = "myproject"
include(":app", ":lib")

`lib/build.gradle.kts`

plugins {
    kotlin("jvm")
}

group = "com.example"
version = "1.0.0"

`lib/src/main/kotlin/MathUtils.kt`

fun factorial(n: Int): Int {
    var result = 1
    for (i in 1..n) {
        result *= i
    }
    return result
}

fun gcd(a: Int, b: Int): Int {
    var x = a
    var y = b
    while (y != 0) {
        val temp = y
        y = x % y
        x = temp
    }
    return x
}

`app/build.gradle.kts`

plugins {
    kotlin("jvm")
    application
}

group = "com.example"
version = "1.0.0"

dependencies {
    implementation(project(":lib"))
}

application {
    mainClass.set("MainKt")
}

`app/src/main/kotlin/Main.kt`

fun main() {
    println("5! = ${factorial(5)}")
    println("gcd(12, 8) = ${gcd(12, 8)}")
}

Build and run

cd myproject
skotch build
java -jar build/example.jar

5! = 120
gcd(12, 8) = 4

Skotch reads settings.gradle.kts to discover modules, resolves project() dependencies, compiles :lib first, then :app, and merges all class files into the final JAR.

Current limitations