Basic gradle file (kotlin)

build.gradle.kts

group = "net.sek.lib"
version = "1.0-SNAPSHOT"

plugins {
    `maven-publish`
    kotlin("jvm") version "1.3.31"
}

repositories {
    jcenter()
    mavenCentral()
}

dependencies {
    implementation(kotlin("stdlib"))
}

publishing {
    val mavenUser: String by project
    val mavenPassword: String by project
    val baseRepo: String by project

    publications {
        create<MavenPublication>("default") {
            from(components["java"])
        }
    }
    repositories {
        maven {
            credentials {
                username = mavenUser
                password = mavenPassword
            }

            url = when {
                (version as String).endsWith("SNAPSHOT") -> uri("$baseRepo/maven-snapshots")
                else -> uri("$baseRepo/maven-releases")
            }
        }
    }
}