Samples: Don't reuse the root gradle.properties

Earlier we used a single gradle.properties in all samples. But some
of samples are represented by separate gradle builds. In such samples
we had to read this gradle.properties manually making these samples
less clear. This patch creates a separate gradle.properties for
each gradle build and gets rid of manual property reading.

samples/androidNativeActivity/gradle.properties

@@ -1 +1,11 @@
 kotlin.code.style=official
+
+# Run parallel builds in Gradle:
+org.gradle.parallel=true
+org.gradle.workers.max=4
+
+# Pin Kotlin version:
+kotlin_version=1.3.30-eap-113
+
+# Use custom Kotlin/Native home:
+org.jetbrains.kotlin.native.home=../../dist

samples/androidNativeActivity/settings.gradle

@@ -1,20 +0,0 @@
-// Reuse Kotlin version from the root project.
-File rootProjectGradlePropertiesFile = file("${rootProject.projectDir}/../gradle.properties")
-if (!rootProjectGradlePropertiesFile.isFile()) {
-    throw new Exception("File $rootProjectGradlePropertiesFile does not exist or is not a file")
-}
-
-Properties rootProjectProperties = new Properties()
-rootProjectGradlePropertiesFile.withInputStream { inputStream ->
-    rootProjectProperties.load(inputStream)
-    if (!rootProjectProperties.containsKey('kotlin_version')) {
-        throw new Exception("No 'kotlin_version' property in $rootProjectGradlePropertiesFile file")
-    }
-}
-
-gradle.beforeProject { project ->
-    rootProjectProperties.forEach { String key, value ->
-        if (!project.hasProperty(key))
-            project.ext[key] = value
-    }
-}

samples/calculator/gradle.properties

@@ -1,4 +1,11 @@
 kotlin.code.style=official
 
+# Run parallel builds in Gradle:
+org.gradle.parallel=true
+org.gradle.workers.max=4
+
+# Pin Kotlin version:
+kotlin_version=1.3.30-eap-113
+
 # Use custom Kotlin/Native home:
 org.jetbrains.kotlin.native.home=../../../dist

samples/calculator/settings.gradle

@@ -1,24 +1,3 @@
-// Reuse Kotlin version from the root project.
-File rootProjectGradlePropertiesFile = file("${rootProject.projectDir}/../gradle.properties")
-if (!rootProjectGradlePropertiesFile.isFile()) {
-    throw new Exception("File $rootProjectGradlePropertiesFile does not exist or is not a file")
-}
-
-Properties rootProjectProperties = new Properties()
-rootProjectGradlePropertiesFile.withInputStream { inputStream ->
-    rootProjectProperties.load(inputStream)
-    if (!rootProjectProperties.containsKey('kotlin_version')) {
-        throw new Exception("No 'kotlin_version' property in $rootProjectGradlePropertiesFile file")
-    }
-}
-
-gradle.beforeProject { project ->
-    rootProjectProperties.forEach { String key, value ->
-        if (!project.hasProperty(key))
-            project.ext[key] = value
-    }
-}
-
 include ':arithmeticParser'
 include ':cliApp'
 

samples/cocoapods/kotlin-library/gradle.properties

@@ -1 +1,11 @@
-org.jetbrains.kotlin.native.home=../../../dist
+kotlin.code.style=official
+
+# Run parallel builds in Gradle:
+org.gradle.parallel=true
+org.gradle.workers.max=4
+
+# Pin Kotlin version:
+kotlin_version=1.3.30-eap-113
+
+# Use custom Kotlin/Native home:
+org.jetbrains.kotlin.native.home=../../../dist

samples/cocoapods/kotlin-library/settings.gradle.kts

@@ -6,36 +6,15 @@ pluginManagement {
     }
 
     resolutionStrategy {
-        // Workaround to be able to read plugin version from the properties file.
-        // See: https://stackoverflow.com/questions/52800536/how-to-use-plugin-version-from-gradle-properties-in-gradle-kotlin-dsl.
-        val kotlinVersion = getRootProperties().getValue("kotlin_version") as String
+        val kotlin_version: String by settings
         eachPlugin {
             when {
                 requested.id.id == "org.jetbrains.kotlin.native.cocoapods" ||
                 requested.id.id == "kotlin-native-cocoapods" ->
-                    useModule("org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion")
+                    useModule("org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version")
                 requested.id.id.startsWith("org.jetbrains.kotlin") ->
-                    useVersion(kotlinVersion)
+                    useVersion(kotlin_version)
             }
         }
     }
-}
-
-// Reuse Kotlin version and other properties from the root samples project.
-fun getRootProperties() = java.util.Properties().apply {
-    val rootProjectGradlePropertiesFile = file("${rootProject.projectDir}/../../gradle.properties")
-    if (!rootProjectGradlePropertiesFile.isFile) {
-        throw Exception("File $rootProjectGradlePropertiesFile does not exist or is not a file")
-    }
-
-    rootProjectGradlePropertiesFile.inputStream().use { inputStream ->
-        load(inputStream)
-    }
-}
-
-gradle.beforeProject {
-    getRootProperties().forEach { key, value ->
-        if (!project.hasProperty(key as String))
-            project.extra[key] = value
-    }
-}
+}

samples/gradle.properties

@@ -1,3 +1,5 @@
+kotlin.code.style=official
+
 # Run parallel builds in Gradle:
 org.gradle.parallel=true