Merge pull request #131 from vlsi/run_demo

Add gradlew runDemo task to lauch demos from the command line

core/build.gradle.kts

@@ -63,3 +63,35 @@ tasks.shadowJar {
     exclude("com/sun/jna/sunos-x86/")
     exclude("com/sun/jna/sunos-x86-64/")
 }
+
+abstract class DemoTask : JavaExec() {
+    init {
+        setMain("UIDemo")
+    }
+
+    @Option(option = "class", description = "Specifies the main class to run (e.g. UIDemo, ui.table.TableDemo, ui.button.ButtonDemo, ...)")
+    override fun setMain(mainClassName: String?) = super.setMain(mainClassName)
+}
+
+val runDemo by tasks.registering(DemoTask::class) {
+    group = LifecycleBasePlugin.VERIFICATION_GROUP
+    description = "Launches demo (e.g. UIDemo, ui.table.TableDemo, ui.button.ButtonDemo, ...)"
+
+    classpath(sourceSets.test.map { it.runtimeClasspath })
+
+    // Pass the property to the demo
+    // By default JavaExec is executed in its own JVM with its own properties
+    // It allows to pass system properties via gradlew -Ddarklaf.prop=value
+    fun passProperty(name: String, default: String? = null) {
+        val value = System.getProperty(name) ?: default
+        value?.let { systemProperty(name, it) }
+    }
+    val props = System.getProperties()
+    @Suppress("UNCHECKED_CAST")
+    for (e in props.propertyNames() as `java.util`.Enumeration<String>) {
+        if (e.startsWith("darklaf.")) {
+            passProperty(e)
+        }
+    }
+    passProperty("java.awt.headless")
+}