Convert to Gradle project with Kotlin DSL (#5858)

* Convert to Gradle project with Kotlin DSL

Author: stevemessick

.gitignore

@@ -27,6 +27,7 @@ resources/jxbrowser/jxbrowser.properties
 **/.idea/gradle.xml
 .idea/jarRepositories.xml
 .idea/kotlinc.xml
+.idea/runConfigurations.xml
 **/.idea/modules/
 .idea/libraries/Gradle_*.xml
 **/.idea/modules.xml

.idea/libraries/Dart.xml

@@ -10,6 +10,8 @@ You can do this online, and it only takes a minute. If you've never submitted co
 you must add your (or your organization's) name and contact info to the [AUTHORS](AUTHORS)
 file.
 
+NEEDS UPDATING a/o 9 NOV 21
+
 * Install Flutter SDK from [Flutter SDK download](https://flutter.dev/docs/get-started/install) or
   [github](https://github.com/flutter/flutter) and set it up according to its instructions.
 * Verify installation from the command line:

.idea/modules.xml

@@ -0,0 +1,106 @@
+/*
+ * Copyright 2019 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+buildscript {
+  repositories {
+    mavenCentral()
+    maven {
+      url=uri("https://www.jetbrains.com/intellij-repository/snapshots/")
+    }
+    maven {
+      url=uri("https://oss.sonatype.org/content/repositories/snapshots/")
+    }
+    maven {
+      url=uri("https://www.jetbrains.com/intellij-repository/releases")
+    }
+  }
+}
+
+plugins {
+  id("org.jetbrains.intellij") version "1.1.4"
+  id("org.jetbrains.kotlin.jvm") version "1.4.31"
+}
+
+repositories {
+  mavenLocal()
+  mavenCentral()
+  maven {
+    url=uri("https://www.jetbrains.com/intellij-repository/snapshots/")
+  }
+  maven {
+    url=uri("https://oss.sonatype.org/content/repositories/snapshots/")
+  }
+  maven {
+    url=uri("https://www.jetbrains.com/intellij-repository/releases")
+  }
+}
+
+// Specify UTF-8 for all compilations so we avoid Windows-1252.
+allprojects {
+  tasks.withType<JavaCompile>() {
+    options.encoding = "UTF-8"
+  }
+  tasks.withType<Test>() {
+    systemProperty("file.encoding", "UTF-8")
+  }
+}
+
+val ide: String by project
+val flutterPluginVersion: String by project
+val javaVersion: String by project
+val dartVersion: String by project
+val baseVersion: String by project
+val name: String by project
+val buildSpec: String by project
+
+group = "io.flutter"
+version = flutterPluginVersion
+
+java {
+  sourceCompatibility = JavaVersion.toVersion(javaVersion)
+  targetCompatibility = JavaVersion.toVersion(javaVersion)
+}
+
+intellij {
+  pluginName.set(name)
+  // This adds nullability assertions, but also compiles forms.
+  instrumentCode.set(true)
+  updateSinceUntilBuild.set(false)
+  localPath.set("${project.rootDir.absolutePath}/artifacts/$ide")
+  downloadSources.set(false)
+  val pluginList = mutableListOf(
+    project(":flutter-idea"), "java", "Dart:$dartVersion", "properties",
+    "junit", "Git4Idea", "Kotlin", "gradle", "org.jetbrains.android",
+    "Groovy", "smali", "IntelliLang")
+  if (ide == "android-studio") {
+    pluginList += listOf(project(":flutter-studio"))
+  } else if ("$buildSpec" == "2020.3") {
+    pluginList += listOf("gradle-dsl-impl")
+  }
+  plugins.set(pluginList)
+}
+
+tasks {
+  buildSearchableOptions {
+    enabled = false
+  }
+}
+
+dependencies {
+  implementation(project("flutter-idea"))
+  if (ide == "android-studio") {
+    implementation(project("flutter-studio"))
+  }
+}
+
+tasks {
+  instrumentCode {
+    compilerVersion.set("$baseVersion")
+  }
+  instrumentTestCode {
+    compilerVersion.set("$baseVersion")
+  }
+}

.idea/runConfigurations.xml

@@ -1,3 +1,5 @@
+NEEDS TO BE UPDATED a/o 9 NOV 21
+
 # Gradle Module Structure
 
 This module is a mirror of flutter-intellij (the non-Gradle version) that has sources structured