upgrade up to multiplatform project

publish.gradle

@@ -1,33 +1,55 @@
 apply plugin: 'com.jfrog.bintray'
 
-ext {
-    projectBintrayDir = "${project.group}/".replace(".", "/") + "${project.name}/${project.version}"
-}
+apply from: "maven.publish.gradle"
 
 bintray {
     user = project.hasProperty('BINTRAY_USER') ? project.property('BINTRAY_USER') : System.getenv('BINTRAY_USER')
     key = project.hasProperty('BINTRAY_KEY') ? project.property('BINTRAY_KEY') : System.getenv('BINTRAY_KEY')
-    publications = ["maven"]
     filesSpec {
-        into "$projectBintrayDir"
-        from("build/libs") {
-            include "**/*.asc"
-        }
-        from("build/publications/maven") {
-            rename 'pom-default.xml(.*)', "${project.name}-${project.version}.pom\$1"
+        from "${buildDir}/publications/"
+        eachFile {
+            String directorySubname = it.getFile().parentFile.name
+            if (it.getName() == "module.json") {
+                if (directorySubname == "kotlinMultiplatform") {
+                    it.setPath("${project.name}/${project.version}/${project.name}-${project.version}.module")
+                } else {
+                    it.setPath("${project.name}-${directorySubname}/${project.version}/${project.name}-${directorySubname}-${project.version}.module")
+                }
+            } else {
+                if (directorySubname == "kotlinMultiplatform" && it.getName() == "pom-default.xml") {
+                    it.setPath("${project.name}/${project.version}/${project.name}-${project.version}.pom")
+                } else {
+                    it.exclude()
+                }
+            }
         }
+        into "${project.group}".replace(".", "/")
     }
     pkg {
-        repo = 'StandardRepository'
+        repo = "StandardRepository"
         name = "${project.name}"
         vcsUrl = "https://github.com/InsanusMokrassar/${project.name}"
-        licenses = ['Apache-2.0']
+        licenses = ["Apache-2.0"]
         version {
             name = "${project.version}"
             released = new Date()
-            vcsTag = name
+            vcsTag = "${project.version}"
+            gpg {
+                sign = true
+                passphrase = project.hasProperty('signing.gnupg.passphrase') ? project.property('signing.gnupg.passphrase') : System.getenv('signing.gnupg.passphrase')
+            }
         }
     }
 }
 
-apply from: "maven.publish.gradle"
+bintrayUpload.doFirst {
+    publications = publishing.publications.collect {
+        if (it.name.contains('kotlinMultiplatform')) {
+            null
+        } else {
+            it.name
+        }
+    } - null
+}
+
+bintrayUpload.dependsOn publishToMavenLocal