added gradle plugin for publication

Author: Legion2

build.gradle.kts

@@ -1,6 +1,6 @@
 plugins {
     kotlin("multiplatform") version "1.5.10"
-    id("maven-publish")
+    id("convention.publication")
 }
 
 group = "com.vdurmont"

convention-plugins/build.gradle.kts

@@ -0,0 +1,12 @@
+plugins {
+    `kotlin-dsl`
+}
+
+dependencies {
+    implementation("org.jetbrains.dokka:dokka-gradle-plugin:1.4.32")
+}
+
+repositories {
+    gradlePluginPortal()
+    mavenCentral()
+}

convention-plugins/src/main/kotlin/convention.publication.gradle.kts

@@ -0,0 +1,102 @@
+import java.util.*
+
+plugins {
+    `maven-publish`
+    signing
+    id("org.jetbrains.dokka")
+}
+
+val signingKey: String? = System.getenv("SIGNING_SIGNING_KEY")
+val signingPassword: String? = System.getenv("SIGNING_PASSWORD")
+
+// Stub secrets to let the project sync and build without the publication values set up
+ext["ossrhUsername"] = null
+ext["ossrhPassword"] = null
+
+// Grabbing secrets from local.properties file or from environment variables, which could be used on CI
+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["ossrhUsername"] = System.getenv("OSSRH_USERNAME")
+    ext["ossrhPassword"] = System.getenv("OSSRH_PASSWORD")
+}
+
+fun getExtraString(name: String) = ext[name]?.toString()
+
+tasks {
+    val dokkaOutputDir = "$buildDir/dokka"
+
+    dokkaHtml {
+        outputDirectory.set(file(dokkaOutputDir))
+    }
+
+    val deleteDokkaOutputDir by registering(Delete::class) {
+        delete(dokkaOutputDir)
+    }
+
+    register<Jar>("javadocJar") {
+        dependsOn(deleteDokkaOutputDir, dokkaHtml)
+        archiveClassifier.set("javadoc")
+        from(dokkaOutputDir)
+    }
+}
+
+publishing {
+    // Configure maven central repository
+    repositories {
+        maven {
+            name = "sonatype"
+            setUrl("https://s01.oss.sonatype.org/service/local/staging/deploy/maven2/")
+            credentials {
+                username = getExtraString("ossrhUsername")
+                password = getExtraString("ossrhPassword")
+            }
+        }
+    }
+
+    // Configure all publications
+    publications.withType<MavenPublication> {
+
+        artifact(tasks.named<Jar>("javadocJar").get())
+
+        // Provide artifacts information requited by Maven Central
+        pom {
+            name.set("Semver4k")
+            description.set("Semver Kotlin Multiplatform library")
+            url.set("https://github.com/voize-gmbh/semver4k")
+
+            licenses {
+                license {
+                    name.set("MIT")
+                    url.set("https://opensource.org/licenses/MIT")
+                }
+            }
+            developers {
+                developer {
+                    id.set("LeonKiefer")
+                    name.set("Leon Kiefer")
+                    email.set("leon@voize.de")
+                }
+            }
+            scm {
+                url.set("https://github.com/voize-gmbh/semver4k")
+            }
+        }
+    }
+}
+
+if (signingPassword != null) {
+    signing {
+        if (signingKey != null) {
+            useInMemoryPgpKeys(signingKey, signingPassword)
+        }
+        sign(publishing.publications)
+    }
+}

settings.gradle.kt

@@ -0,0 +1,3 @@
+rootProject.name = "semver4k"
+
+includeBuild("convention-plugins")