fix: Fix alias not being registered for group subcommands

bot/src/main/kotlin/io/github/null2264/tsukumogami/bot/core/module/GeneralModule.kt

@@ -16,7 +16,9 @@ val generalModule = botModules("General") {
     groups("group") {
         commands("test", arguments = ::Test2Arguments) { ctx, args -> ctx.reply("Hello world ${args.user}") }
         groups("group") {
-            commands("test", arguments = ::TestArguments) { ctx, args -> ctx.reply("Hello world ${args.test}") }
+            commands("test", alias = setOf("t")) { ctx ->
+                ctx.reply("Hello world ${ctx.command?.module?.name}")
+            }
         }
     }
 

core/src/main/kotlin/io/github/null2264/tsukumogami/core/commands/Command.kt

@@ -1,6 +1,7 @@
 package io.github.null2264.tsukumogami.core.commands
 
 import io.github.null2264.tsukumogami.core.Context
+import io.github.null2264.tsukumogami.core.module.BotModule
 import kotlin.reflect.KFunction
 
 open class Command(
@@ -11,6 +12,22 @@ open class Command(
     private val handler: suspend (Context, Arguments) -> Unit,
 ) {
 
+    /**
+     * Return parent command if this command is a subcommand otherwise it returns null
+     */
+    var parent: Command? = null
+
+    /**
+     * The module this command belong to
+     */
+    var module: BotModule? = null
+        get() {
+            if (parent != null) {
+                field = parent?.module
+            }
+            return field
+        }
+
     open suspend fun invoke(context: Context) {
         val parsedArguments = arguments.call()
         parsedArguments.parse(context)

core/src/main/kotlin/io/github/null2264/tsukumogami/core/commands/Group.kt

@@ -1,7 +1,9 @@
 package io.github.null2264.tsukumogami.core.commands
 
 import io.github.null2264.tsukumogami.core.Context
+import io.github.null2264.tsukumogami.core.annotation.TsukumogamiInternalApi
 
+@OptIn(TsukumogamiInternalApi::class)
 class Group(
     name: String,
     alias: Set<String>,
@@ -18,6 +20,11 @@ class Group(
 
     override val allCommands: MutableMap<String, Command> = mutableMapOf()
 
+    override fun _addCommand(command: Command) {
+        command.parent = this
+        super._addCommand(command)
+    }
+
     override suspend fun invoke(context: Context) {
         val subcommandName = context.message.content
             .substringAfter("${context.prefix}${context.invokedWith}")

core/src/main/kotlin/io/github/null2264/tsukumogami/core/commands/IGroup.kt

@@ -1,14 +1,18 @@
 package io.github.null2264.tsukumogami.core.commands
 
 import io.github.null2264.tsukumogami.core.Context
+import io.github.null2264.tsukumogami.core.annotation.TsukumogamiInternalApi
 import kotlin.reflect.KFunction
 
+@OptIn(TsukumogamiInternalApi::class)
 interface IGroup {
 
     val allCommands: MutableMap<String, Command>
 
-    private fun addCommand(command: Command) {
+    @TsukumogamiInternalApi
+    fun _addCommand(command: Command) {
         allCommands[command.name] = command
+        command.alias.forEach { allCommands[it] = command }
     }
 
     fun commands(
@@ -18,7 +22,7 @@ interface IGroup {
         handler: suspend (Context) -> Unit,
     ) {
         val command = Command(name, alias, description, ::EmptyArguments) { ctx, _ -> handler(ctx) }
-        addCommand(command)
+        _addCommand(command)
     }
 
     fun <Args : Arguments> commands(
@@ -29,7 +33,7 @@ interface IGroup {
         handler: suspend (Context, Args) -> Unit,
     ) {
         val command = Command(name, alias, description, arguments) { ctx, args -> handler(ctx, args as Args) }
-        addCommand(command)
+        _addCommand(command)
     }
 
     fun groups(
@@ -40,6 +44,6 @@ interface IGroup {
     ) {
         val group = Group(name, alias, description)
         declaration(group)
-        addCommand(group)
+        _addCommand(group)
     }
 }

core/src/main/kotlin/io/github/null2264/tsukumogami/core/module/BotModule.kt

@@ -1,20 +1,27 @@
 package io.github.null2264.tsukumogami.core.module
 
 import io.github.null2264.tsukumogami.core.Bot
+import io.github.null2264.tsukumogami.core.annotation.TsukumogamiInternalApi
 import io.github.null2264.tsukumogami.core.commands.Command
 import io.github.null2264.tsukumogami.core.commands.IGroup
 
+@OptIn(TsukumogamiInternalApi::class)
 open class BotModule constructor(val name: String) : IGroup {
 
     override val allCommands: MutableMap<String, Command> = mutableMapOf()
 
+    override fun _addCommand(command: Command) {
+        command.module = this
+        super._addCommand(command)
+    }
+
     internal fun install(bot: Bot): BotModule {
-        allCommands.values.forEach(bot::addCommand)
+        allCommands.values.distinctBy { it.name }.forEach(bot::addCommand)
         return this
     }
 
     internal fun uninstall(bot: Bot): BotModule {
-        allCommands.values.forEach(bot::removeCommand)
+        allCommands.values.distinctBy { it.name }.forEach(bot::removeCommand)
         return this
     }
 }