Switch to IJP 242 EAP

This in turn requires:
1. Updating the IJP Gradle plugin to 2.0 (beta)
2. Reworking the IDE sample build.gradle.kts in the new 2.0 syntax
3. Bumping the JBR version to 21

buildSrc/settings.gradle.kts

@@ -7,6 +7,7 @@ rootProject.name = "buildSrc"
 dependencyResolutionManagement {
     repositories {
         google()
+        maven("https://maven.pkg.jetbrains.space/public/p/compose/dev")
         gradlePluginPortal()
         mavenCentral()
     }

buildSrc/src/main/kotlin/jewel.gradle.kts

@@ -19,14 +19,14 @@ version = when {
 java {
     toolchain {
         vendor = JvmVendorSpec.JETBRAINS
-        languageVersion = JavaLanguageVersion.of(17)
+        languageVersion = JavaLanguageVersion.of(21)
     }
 }
 
 kotlin {
     jvmToolchain {
         vendor = JvmVendorSpec.JETBRAINS
-        languageVersion = JavaLanguageVersion.of(17)
+        languageVersion = JavaLanguageVersion.of(21)
     }
 
     target {

decorated-window/src/main/kotlin/org/jetbrains/jewel/window/utils/macos/ID.kt

@@ -6,6 +6,7 @@ import com.sun.jna.NativeLong
  * Could be an address in memory (if pointer to a class or method) or a
  * value (like 0 or 1)
  */
+@Suppress("OVERRIDE_DEPRECATION") // Copied code
 internal class ID : NativeLong {
     constructor()
     constructor(peer: Long) : super(peer)

gradle.properties

@@ -6,5 +6,7 @@ kotlin.stdlib.default.dependency=false
 # See https://jb.gg/intellij-platform-kotlin-oom
 kotlin.incremental.useClasspathSnapshot=false
 
-ijp.target=241
+org.jetbrains.intellij.platform.buildFeature.useBinaryReleases=false
+
+ijp.target=242
 jewel.release.version=0.19.7

gradle/libs.versions.toml

@@ -3,8 +3,8 @@ commonmark = "0.22.0"
 composeDesktop = "1.7.0-dev1703"
 detekt = "1.23.6"
 dokka = "1.9.20"
-idea = "241.17890.1"
-ideaGradlePlugin = "1.17.3"
+idea = "242.19533.56-EAP-SNAPSHOT"
+ideaGradlePlugin = "2.0.0-beta8"
 jna = "5.14.0"
 kotlin = "1.9.24"
 kotlinSarif = "0.5.0"
@@ -46,7 +46,7 @@ idea = ["ij-platform-ide-core", "ij-platform-ide-impl", "ij-platform-core-ui"]
 composeDesktop = { id = "org.jetbrains.compose", version.ref = "composeDesktop" }
 detekt = { id = "io.gitlab.arturbosch.detekt", version.ref = "detekt" }
 dokka = { id = "org.jetbrains.dokka", version.ref = "dokka" }
-ideaGradlePlugin = { id = "org.jetbrains.intellij", version.ref = "ideaGradlePlugin" }
+ideaGradlePlugin = { id = "org.jetbrains.intellij.platform", version.ref = "ideaGradlePlugin" }
 kotlinJvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
 kotlinx-binaryCompatValidator = { id = "org.jetbrains.kotlinx.binary-compatibility-validator", version.ref = "kotlinxBinaryCompat" }
 kotlinx-serialization = { id = "org.jetbrains.kotlin.plugin.serialization", version.ref = "kotlin" }

samples/ide-plugin/build.gradle.kts

@@ -5,24 +5,18 @@ plugins {
     `android-studio-releases-generator`
 }
 
-intellij {
-    pluginName = "Jewel Demo"
-    plugins = listOf("org.jetbrains.kotlin")
-    version = libs.versions.idea.get()
-}
-
-// TODO remove this once the IJ Gradle plugin fixes their repositories bug
-// See https://github.com/JetBrains/gradle-intellij-plugin/issues/776
 repositories {
-    maven("https://maven.pkg.jetbrains.space/public/p/compose/dev")
-    maven("https://www.jetbrains.com/intellij-repository/releases")
-    maven("https://cache-redirector.jetbrains.com/intellij-dependencies")
-    google()
-    mavenCentral()
-
+    intellijPlatform {
+        defaultRepositories()
+    }
 }
 
 dependencies {
+    intellijPlatform {
+        intellijIdeaCommunity(libs.versions.idea)
+        bundledPlugins("org.jetbrains.kotlin")
+    }
+
     implementation(projects.ideLafBridge) {
         exclude(group = "org.jetbrains.kotlinx")
     }
@@ -37,6 +31,10 @@ dependencies {
     }
 }
 
+intellijPlatform {
+    pluginConfiguration { name = "Jewel Demo" }
+}
+
 tasks {
     // We don't have any settings in the demo plugin
     buildSearchableOptions {

settings.gradle.kts

@@ -6,9 +6,10 @@ rootProject.name = "jewel"
 
 pluginManagement {
     repositories {
-        gradlePluginPortal()
         maven("https://maven.pkg.jetbrains.space/kotlin/p/kotlin/dev/")
         maven("https://maven.pkg.jetbrains.space/public/p/compose/dev")
+        maven("https://oss.sonatype.org/content/repositories/snapshots/")
+        gradlePluginPortal()
         mavenCentral()
     }
 }
@@ -17,9 +18,6 @@ dependencyResolutionManagement {
     repositories {
         google()
         maven("https://maven.pkg.jetbrains.space/public/p/compose/dev")
-        maven("https://www.jetbrains.com/intellij-repository/releases")
-        maven("https://www.jetbrains.com/intellij-repository/snapshots")
-        maven("https://cache-redirector.jetbrains.com/intellij-dependencies")
         mavenCentral()
     }
 }