add proper help command

src/main/kotlin/nl/voidcorp/dbot/UnityBot.kt

@@ -15,6 +15,7 @@ import net.dv8tion.jda.core.JDA
 import net.dv8tion.jda.core.JDABuilder
 import net.dv8tion.jda.core.MessageBuilder
 import net.dv8tion.jda.core.entities.Game
+import net.dv8tion.jda.core.entities.MessageEmbed
 import net.dv8tion.jda.webhook.WebhookClient
 import net.dv8tion.jda.webhook.WebhookClientBuilder
 import nl.voidcorp.dbot.commands.helloCommand
@@ -24,6 +25,7 @@ import nl.voidcorp.dbot.storage.GitlabWebhook
 import org.slf4j.LoggerFactory
 import java.io.File
 import java.io.FileReader
+import java.time.LocalDateTime
 
 val playerManager = DefaultAudioPlayerManager()
 
@@ -99,6 +101,16 @@ fun main(args: Array<String>) {
     val replies = listOf("Hello %%", "Why hello there %%!", "Hello there %%", "General %%. You are a bold one", "A wild %% appeared!")
     cb.setHelpConsumer { event ->
         val greeting = replies.random().replace("%%", event.member.effectiveName)
+        val eb = EmbedBuilder().setTitle(greeting)
+                .appendDescription("My name is ${event.selfMember.effectiveName}, and I am definitely the best Discord bot around!\n\nUse `!help command` for a chance that I have more info about a command!")
+                .setColor(event.selfMember.color).setFooter("Requested by ${event.member.effectiveName}", event.author.effectiveAvatarUrl).setTimestamp(LocalDateTime.now())
+        val m = commands.catMap()
+        for (e in m.entries){
+
+            val f = MessageEmbed.Field(e.key, e.value.joinToString(separator = "\n") { "!${it.name}" }, true)
+            eb.addField(f)
+        }
+        eb.setThumbnail(event.selfUser.effectiveAvatarUrl)
         val mb = MessageBuilder("$greeting\n").append {
             var st = ""
             for (c in commands) {
@@ -108,7 +120,7 @@ fun main(args: Array<String>) {
         }
 
 
-        event.reply(mb.build())
+        event.reply(eb.build())
     }
 
     initMusic()

src/main/kotlin/nl/voidcorp/dbot/Util.kt

@@ -2,6 +2,7 @@ package nl.voidcorp.dbot
 
 import com.google.gson.Gson
 import com.google.gson.GsonBuilder
+import com.jagrosh.jdautilities.command.Command
 import java.util.*
 
 val gson: Gson = GsonBuilder().setPrettyPrinting().create()
@@ -10,4 +11,17 @@ val random = Random()
 
 fun <E> MutableList<E>.addAll(vararg e: E) = this.addAll(listOf(*e))
 
-fun <E> List<E>.random(): E = this[random.nextInt(this.size)]
+fun <E> List<E>.random(): E = this[random.nextInt(this.size)]
+
+fun List<Command>.catMap(): Map<String, List<Command>> {
+    val m = mutableMapOf<String, MutableList<Command>>()
+    for (c in this) {
+        val cname = if (c.category==null) "Unknown" else c.category.name
+        if (!m.containsKey(cname)) {
+            m[cname] = mutableListOf()
+        }
+
+        m[cname]!!+=c
+    }
+    return m
+}