Added weight and speed conversions.

build.gradle.kts

@@ -11,6 +11,9 @@ repositories {
 
 dependencies {
     testImplementation(kotlin("test"))
+    // https://mvnrepository.com/artifact/org.javacord/javacord
+    implementation("org.javacord:javacord:3.8.0")
+
 }
 
 tasks.test {

src/main/kotlin/Main.kt

@@ -1,5 +1,60 @@
 package org.example
 
+import org.javacord.api.DiscordApiBuilder
+import org.javacord.api.event.message.MessageCreateEvent
+
+fun extractNumbers(pattern: String, text: String?): List<Double> {
+    val matches = Regex(pattern).findAll(text ?: "")
+    return matches
+        .filter { it.groups[1] != null }
+        .map { it.value.lowercase() }
+        .map { it.replace(",", ".").toDouble() }
+        .toList()
+}
+
+fun convertKg(event: MessageCreateEvent) {
+    for (kgs in extractNumbers("/(\\d+[,.]*\\d*)\\s*kg/gm", event.message.content)) {
+        val pounds = kgs * 2.20462262
+        event.channel.sendMessage("$kgs kg = $pounds lb")
+    }
+}
+
+fun convertLbs(event: MessageCreateEvent) {
+    for (pounds in extractNumbers("/(\\d+[,.]*\\d*)\\s*lb/gm", event.message.content)) {
+        val kgs = pounds / 2.20462262
+        event.channel.sendMessage("$pounds lb = $kgs kg")
+    }
+}
+
+fun convertMph(event: MessageCreateEvent) {
+    for (mph in extractNumbers("/(\\d+[,.]*\\d*)\\s*mi*ph/gm", event.message.content)) {
+        val kmph = mph * 1.609344
+        val mps = kmph / 3.6
+        event.channel.sendMessage("$mph lb = $kmph km/h = $mps m/s")
+    }
+}
+
+fun convertKmh(event: MessageCreateEvent) {
+    for (kmph in extractNumbers("/(\\d+[,.]*\\d*)\\s*km*[p\\/]h/gm", event.message.content)) {
+        val mph = kmph / 1.609344
+        val mps = kmph / 3.6
+        event.channel.sendMessage("$kmph km/h = $mph lb = $mps m/s")
+    }
+}
+
 fun main() {
-    println("Hello World!")
+    val token = System.getenv("DISCORD_UNITS_BOT_TOKEN") ?: return
+
+    val api = DiscordApiBuilder()
+        .setAllIntents()
+        .setToken(token)
+        .login()
+        .join()
+
+    api.addMessageCreateListener {
+        convertKg(it)
+        convertLbs(it)
+        convertMph(it)
+        convertKmh(it)
+    }
 }