feat(cli): Use a "pathing" JAR to shortend the classpath argument

Author: sschuberth

cli/build.gradle.kts

@@ -1,5 +1,7 @@
 import java.nio.file.Files
 
+import java.nio.charset.Charset
+
 import org.graalvm.buildtools.gradle.tasks.BuildNativeImageTask
 
 plugins {
@@ -26,6 +28,50 @@ dependencies {
     implementation(libs.kotlinReflect)
 }
 
+val jar by tasks.getting(Jar::class)
+
+val pathingJar by tasks.registering(Jar::class) {
+    archiveClassifier = "pathing"
+
+    manifest {
+        // Work around the command line length limit on Windows when passing the classpath to Java, see
+        // https://github.com/gradle/gradle/issues/1989.
+        attributes["Class-Path"] = configurations.runtimeClasspath.get().joinToString(" ") { it.name }
+    }
+}
+
+distributions {
+    main {
+        contents {
+            from(pathingJar) {
+                into("lib")
+            }
+        }
+    }
+}
+
+tasks.named<CreateStartScripts>("startScripts") {
+    classpath = jar.outputs.files + pathingJar.get().outputs.files
+
+    doLast {
+        // Append the plugin directory to the Windows classpath.
+        val windowsScriptText = windowsScript.readText(Charset.defaultCharset())
+        windowsScript.writeText(
+            windowsScriptText.replace(
+                Regex("(set CLASSPATH=%APP_HOME%\\\\lib\\\\.*)"), "$1;%APP_HOME%\\\\plugin\\\\*"
+            )
+        )
+
+        // Append the plugin directory to the Unix classpath.
+        val unixScriptText = unixScript.readText(Charset.defaultCharset())
+        unixScript.writeText(
+            unixScriptText.replace(
+                Regex("(CLASSPATH=\\\$APP_HOME/lib/.*)"), "$1:\\\$APP_HOME/plugin/*"
+            )
+        )
+    }
+}
+
 graalvmNative {
     toolchainDetection = System.getenv("GRAALVM_HOME") == null