Kotlinマルチプラットフォームライブラリの作り方

package io.github.arashiyama11

//プラットフォーム依存のクラス
expect open class Plat() {
  //プラットフォーム名を返す
  fun platform():String
}

//共通の関数
class Temp: Plat() {
  fun hello()="Hello!"
}

package io.github.arashiyama11

actual open class Plat actual constructor() {
  actual fun platform(): String {
    TODO("Not yet implemented")
  }
}

package io.github.arashiyama11

actual open class Plat actual constructor() {
  actual fun platform() = "js"
}

package io.github.arashiyama11

import kotlin.test.Test
import kotlin.test.assertEquals

class Test {
  @Test
  fun testHello(){
    assertEquals("Hello!",Temp().hello())
  }
}

package io.github.arashiyama11

import kotlin.test.Test
import kotlin.test.assertEquals

class JSTest {
  @Test
  fun testPlat(){
    assertEquals("js",Temp().platform())
  }
}

plugins {
    kotlin("multiplatform") version "1.7.21"
    //下の一行を追加
    `maven-publish`
}

group = "io.github.arashiyama11"
version = "1.0.0"

repositories {
    mavenCentral()
    //ここを追加
    mavenLocal()
}

dependencies {
    //ここを追加
    implementation("io.github.arashiyama11:kotlin-multiplatform-library-template:1.0.0")
    testImplementation(kotlin("test"))
}

plugins {
  `kotlin-dsl`
}

repositories {
  gradlePluginPortal()
}

import org.gradle.api.publish.maven.MavenPublication
import org.gradle.api.tasks.bundling.Jar
import org.gradle.kotlin.dsl.`maven-publish`
import org.gradle.kotlin.dsl.signing
import java.util.*

plugins {
  `maven-publish`
  signing
}

ext["signing.keyId"] = null
ext["signing.password"] = null
ext["signing.secretKeyRingFile"] = null
ext["ossrhUsername"] = null
ext["ossrhPassword"] = null

val secretPropsFile = project.rootProject.file("local.properties")
if (secretPropsFile.exists()) {
  secretPropsFile.reader().use {
    Properties().apply {
      load(it)
    }
  }.onEach { (name, value) ->
    ext[name.toString()] = value
  }
} else {
  ext["signing.keyId"] = System.getenv("SIGNING_KEY_ID")
  ext["signing.password"] = System.getenv("SIGNING_PASSWORD")
  ext["signing.secretKeyRingFile"] = System.getenv("SIGNING_SECRET_KEY_RING_FILE")
  ext["ossrhUsername"] = System.getenv("OSSRH_USERNAME")
  ext["ossrhPassword"] = System.getenv("OSSRH_PASSWORD")
}

val javadocJar by tasks.registering(Jar::class) {
  archiveClassifier.set("javadoc")
}

fun getExtraString(name: String) = ext[name]?.toString()

publishing {
  repositories {
    maven {
      name = "sonatype"
      setUrl("https://s01.oss.sonatype.org/service/local/staging/deploy/maven2/")
      credentials {
        username = getExtraString("ossrhUsername")
        password = getExtraString("ossrhPassword")
      }
    }
  }

  publications.withType<MavenPublication> {
    artifact(javadocJar.get())

    pom {
      //下の3行変更
      name.set("kotlin-multiplatform-library-template")
      description.set("kotlin-multiplatform-library-template")
      url.set("https://github.com/arashiyama11/kotlin-multiplatform-library-template")

      licenses {
        license {
          name.set("MIT")
          url.set("https://opensource.org/licenses/MIT")
        }
      }
      developers {
        developer {
          //下2行変更
          id.set("arashiyama11")
          name.set("arashiyama")
        }
      }
      scm {
        //下1行変更
        url.set("https://github.com/arashiyama11/kotlin-multiplatform-library-template")
      }
    }
  }
}


signing {
  sign(publishing.publications)
}

rootProject.name = "kotlin-multiplatform-library-template"
//下一行を追加
includeBuild("convention-plugins")

plugins {
    kotlin("multiplatform") version "1.7.21"
    id("convention.publication")
}

# The GPG key pair ID (last 8 digits of its fingerprint)
signing.keyId=...
# The passphrase of the key pair
signing.password=...
# Private key you exported earlier
signing.secretKeyRingFile=...
# Your credentials for the Jira account
ossrhUsername=...
ossrhPassword=...

repositories {
    mavenCentral()
}

dependencies {
    //ここを追加
    implementation("io.github.arashiyama11:kotlin-multiplatform-library-template:1.0.0")
    testImplementation(kotlin("test"))
}