Add Dev Command

src/main/kotlin/commands/dev/DevCommand.kt

@@ -16,6 +16,7 @@ import com.github.ajalt.clikt.parameters.types.file
 import com.github.ajalt.clikt.parameters.types.long
 import com.sun.security.auth.module.UnixSystem
 import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.joinAll
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.runBlocking
 import java.io.File
@@ -183,15 +184,19 @@ class DevCommand : CliktCommand("dev") {
             *command
         ).directory(serverDir).start()
 
-        launch {
+        val input = launch {
             process.inputStream.transferTo(System.out)
         }
-        launch {
+        val error = launch {
             process.errorStream.transferTo(System.err)
         }
-        launch {
+        val console = launch {
             System.`in`.transferTo(process.outputStream)
         }
         process.waitFor()
+        input.cancel()
+        error.cancel()
+        console.cancel()
+        joinAll(input, error, console)
     }
 }