build.gradle.kts

import net.minecraftforge.gradle.userdev.UserDevExtension
import net.minecraftforge.gradle.userdev.UserDevPlugin
import java.time.ZonedDateTime
import java.time.ZoneOffset
import java.time.format.DateTimeFormatter

buildscript {
    repositories {
        maven { setUrl("https://files.minecraftforge.net/maven") }
        jcenter()
        mavenCentral()
    }
    dependencies {
        classpath("net.minecraftforge.gradle:ForgeGradle:3.+")
    }
}

apply {
    plugin<UserDevPlugin>()
    plugin("eclipse")
}

version = "1.0"
group = "com.yourname.modid"
configure<BasePluginConvention> {
    archivesBaseName = "modid"
}

repositories {
    mavenCentral()
}

configure<JavaPluginConvention> {
    sourceCompatibility = JavaVersion.VERSION_1_8
    targetCompatibility = JavaVersion.VERSION_1_8
}

fun minecraft(configure: UserDevExtension.() -> Unit) = project.configure(configure)

minecraft {

    mappings("snapshot", "20180921-1.13")

    runs {
        "client" {
            workingDirectory(project.file("run"))

            // Recommended logging data for a userdev environment
            property("forge.logging.markers", "SCAN,REGISTRIES,REGISTRYDUMP")

            // Recommended logging level for the console
            property("forge.logging.console.level", "debug")

            mods {
                "examplemod" {
                    source(project.the<JavaPluginConvention>().sourceSets["main"])
                }
            }
        }

        "server" {
            workingDirectory(project.file("run"))

            // Recommended logging data for a userdev environment
            property("forge.logging.markers", "SCAN,REGISTRIES,REGISTRYDUMP")

            // Recommended logging level for the console
            property("forge.logging.console.level", "debug")

            mods {
                "examplemod" {
                    source(project.the<JavaPluginConvention>().sourceSets["main"])
                }
            }
        }
    }
}

dependencies {
    "minecraft"("net.minecraftforge:forge:1.13.2-25.0.74")
}

configure<JavaPluginConvention> {
    manifest {
        attributes(mapOf(
                "Specification-Title" to "examplemod",
                "Specification-Vendor" to "examplemodsareus",
                "Specification-Version" to "1",
                "Implementation-Title" to project.name,
                "Implementation-Version" to "$version",
                "Implementation-Vendor" to "examplemodsareus",
                "Implementation-Timestamp" to ZonedDateTime.now(ZoneOffset.UTC).format(DateTimeFormatter.ISO_INSTANT)
        ))
    }
}