Expand Gotlin language and tooling

examples/enums.gt

@@ -0,0 +1,22 @@
+package main
+
+enum PaymentResult {
+    Accepted(String)
+    Rejected(String)
+    Pending
+}
+
+fun describe(result: PaymentResult): String {
+    var description = ""
+    match (result) {
+        PaymentResult::Accepted(id) -> { description = "accepted " + id }
+        PaymentResult::Rejected(reason) -> { description = "rejected " + reason }
+        PaymentResult::Pending -> { description = "pending" }
+    }
+    return description
+}
+
+fun main() {
+    val result = PaymentResult::Accepted("payment-1")
+    println(describe(result))
+}

examples/http_server.gt

@@ -37,7 +37,7 @@ class EpicControllerImpl(val db: *bun.DB) {
 }
 
 worker Counter {
-    val counter = 0
+    var counter = 0
 
     fun getCount(): Int {
         return counter

examples/mapping.gt

@@ -0,0 +1,40 @@
+package main
+
+data class AddressEntity(var city: String)
+data class AddressResponse(var city: String)
+
+enum EntityState {
+    Active
+    Failed(String)
+}
+
+enum ResponseState {
+    Active
+    Failed(String)
+    Pending
+}
+
+data class AccountEntity(
+    var id: String,
+    var address: *AddressEntity,
+    var labels: List<String>,
+    var state: EntityState
+)
+
+data class AccountResponse(
+    var address: *AddressResponse,
+    var id: String,
+    var labels: List<String>,
+    var state: ResponseState
+)
+
+fun main() {
+    val entity = AccountEntity("account-1", AddressEntity("Berlin"), listOf("active"), EntityState::Active)
+    val response = entity.mapTo<AccountResponse>()
+    println(response.address.city)
+    match (response.state) {
+        ResponseState::Active -> { println("active") }
+        ResponseState::Failed(reason) -> { println(reason) }
+        ResponseState::Pending -> { println("pending") }
+    }
+}

examples/showcase.gt

@@ -14,7 +14,7 @@ class PrefixGreeter(val prefix: String): Greeter {
 }
 
 worker Counter {
-    val count = 0
+    var count = 0
 
     fun increment() {
         count += 1