Migrate to Kotlin and upgrade dependencies

build.gradle.kts

@@ -0,0 +1,69 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+fun properties(key: String) = project.findProperty(key).toString()
+
+plugins {
+    id("java")
+    id("org.jetbrains.kotlin.jvm") version "1.6.21"
+    id("org.jetbrains.intellij") version "1.5.3"
+}
+apply(plugin = "org.jetbrains.intellij")
+apply(plugin = "java")
+apply(plugin = "idea")
+
+group = "com.herbert.george.flutter-snippets"
+
+var versionString: String = "${properties("version")}-${properties("releaseChannel")}-${properties("iteration")}"
+
+version = versionString
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation("junit:junit:4.12")
+}
+
+tasks {
+    // Set the JVM compatibility versions
+    properties("javaVersion").let {
+        withType<JavaCompile> {
+            sourceCompatibility = it
+            targetCompatibility = it
+        }
+        withType<KotlinCompile> {
+            kotlinOptions.jvmTarget = it
+        }
+    }
+    patchPluginXml {
+        version.set(versionString)
+        changeNotes.set("Upgrade project to run use Kotlin and the latest IntelliJ plugins and IDEs")
+        sinceBuild.set(properties("pluginSinceBuild"))
+    }
+    publishPlugin {
+        channels.set(listOf(properties("releaseChannel")))
+        token.set(properties("intellijToken"))
+    }
+    runPluginVerifier {
+        ideVersions.set(
+            listOf(
+                "IC-221.5591.52",
+                "IC-222.2270.31"
+            )
+        )
+        verifierVersion.set("latest")
+    }
+}
+
+intellij {
+    plugins.set(
+        listOf("java", "Dart:${properties("dartVersion")}", "io.flutter:${properties("flutterVersion")}")
+    )
+    version.set(properties("ideaVersion"))
+    type.set(properties("ideaType"))
+    pluginName.set(properties("pluginName"))
+}
+
+
+

settings.gradle.kts

@@ -0,0 +1,2 @@
+rootProject.name = "flutter-snippets"
+

src/main/kotlin/FlutterContext.kt

@@ -0,0 +1,8 @@
+import com.intellij.codeInsight.template.TemplateActionContext
+import com.intellij.codeInsight.template.TemplateContextType
+
+class FlutterContext protected constructor() : TemplateContextType("FLUTTER", "Flutter") {
+    override fun isInContext(templateActionContext: TemplateActionContext): Boolean {
+        return templateActionContext.file.name.endsWith(".dart")
+    }
+}

src/main/resources/META-INF/plugin.xml

@@ -1,10 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<idea-plugin>
+<idea-plugin url="https://plugins.jetbrains.com/plugin/12348-flutter-snippets">
     <id>com.herbert.george.flutter-snippets</id>
     <name>Flutter Snippets</name>
     <vendor>George Herbert</vendor>
     <description><![CDATA[
-For full details of the available snippet, please <a href="https://github.com/georgeherby/flutter-snippets/blob/master/README.md">visit here</a>
+For full details of the available snippets, please <a href="https://github.com/georgeherby/flutter-snippets/blob/master/README.md">visit here</a>
 ]]></description>
     <depends>com.intellij.modules.java</depends>
     <extensions defaultExtensionNs="com.intellij">