properly parse config with nullability

src/main/kotlin/moe/kageru/kagebot/Command.kt

@@ -1,6 +1,30 @@
 package moe.kageru.kagebot
 
-class Command(private val input: String, private val output: String) {
-    fun matches(msg: String) = msg.startsWith(this.input)
-    fun respond() = this.output
-}
+class Command(trigger: String?, response: String?, matchType: MatchType?) {
+    val trigger: String = trigger!!
+    val regex: Regex? = if (matchType == MatchType.REGEX) Regex.fromLiteral(trigger!!) else null
+    private val response: String = response!!
+    private val matchType: MatchType = matchType ?: MatchType.PREFIX
+
+    constructor(cmd: Command) : this(cmd.trigger, cmd.response, cmd.matchType)
+
+    fun matches(msg: String) = this.matchType.matches(msg, this)
+    fun respond() = this.response
+}
+
+enum class MatchType {
+    PREFIX {
+        override fun matches(message: String, command: Command) = message.startsWith(command.trigger)
+    },
+    FULL {
+        override fun matches(message: String, command: Command) = message == command.trigger
+    },
+    CONTAINS {
+        override fun matches(message: String, command: Command) = message.contains(command.trigger)
+    },
+    REGEX {
+        override fun matches(message: String, command: Command) = command.regex!!.matches(message)
+    };
+
+    abstract fun matches(message: String, command: Command): Boolean
+}

src/main/kotlin/moe/kageru/kagebot/main.kt

@@ -23,10 +23,11 @@ fun createBot() {
     })
     log.info("kagebot Mk II running")
     api.addMessageCreateListener { event ->
-        if (config.commands.commands[0].matches(event.messageContent)) {
-            event.channel.sendMessage(config.commands.commands[0].respond())
-            println("message was created")
+        for (command in config.commands.commands) {
+            if (command.matches(event.messageContent)) {
+                event.channel.sendMessage(command.respond())
+                break
+            }
         }
     }
-
 }

src/main/resources/config.toml

@@ -7,7 +7,12 @@ admins = [
 [commands]
 commands = [
     {
-        input = "!ping",
-        output = "pong"
+        trigger = "!ping",
+        response = "pong"
+    },
+    {
+        trigger = "somewhere",
+        response = "found it",
+        matchType = "CONTAINS"
     }
 ]