Reconfigure serve command to host web UI

Author: milosmns

src/commonMain/kotlin/commands/cli/ServeCommand.kt

@@ -17,6 +17,7 @@ import io.ktor.server.plugins.contentnegotiation.ContentNegotiation
 import io.ktor.server.plugins.cors.routing.CORS
 import io.ktor.server.plugins.forwardedheaders.ForwardedHeaders
 import io.ktor.server.response.respond
+import io.ktor.server.routing.Route
 import io.ktor.server.routing.get
 import io.ktor.server.routing.routing
 import kotlinx.coroutines.Runnable
@@ -31,7 +32,7 @@ class ServeCommand(
 ) : Runnable {
 
   @Serializable
-  private data class MessageResponse(val message: String)
+  data class MessageResponse(val message: String)
 
   private lateinit var server: BaseApplicationEngine
   private lateinit var storedRepos: List<Repository>
@@ -86,7 +87,7 @@ class ServeCommand(
     install(ContentNegotiation) { json() }
 
     routing {
-      get("/") { call.respond(MessageResponse("Yep, it runs…")) }
+      setUpRoot()
       get("/repos") { call.respond(storedRepos) }
       get("/metrics") { call.respond(metricsByName) }
       get("/time-series") { call.respond(metricsByNameTimeSeries) }
@@ -98,3 +99,5 @@ class ServeCommand(
   }
 
 }
+
+expect fun Route.setUpRoot(): Route

src/jvmMain/kotlin/commands/cli/ServeCommand.kt

@@ -0,0 +1,11 @@
+package commands.cli
+
+import io.ktor.server.http.content.singlePageApplication
+import io.ktor.server.routing.Route
+
+actual fun Route.setUpRoot(): Route = apply {
+  singlePageApplication {
+    useResources = true
+    filesPath = "web"
+  }
+}

src/macNativeMain/kotlin/commands/cli/ServeCommand.kt

@@ -0,0 +1,11 @@
+package commands.cli
+
+import commands.cli.ServeCommand.MessageResponse
+import io.ktor.server.application.call
+import io.ktor.server.response.respond
+import io.ktor.server.routing.Route
+import io.ktor.server.routing.get
+
+actual fun Route.setUpRoot() = get("/") {
+  call.respond(MessageResponse("UI runs only on the JVM"))
+}