refactor: Adjust how command is invoked

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

@@ -6,7 +6,7 @@ import io.github.null2264.tsukumogami.core.module.api.botModules
 import kotlinx.datetime.Clock
 
 val generalModule = botModules("General") {
-    commands("ping", description = "Ping the bot!") { ctx ->
+    commands("ping", alias = setOf("p"), description = "Ping the bot!") { ctx ->
         val startTime = Clock.System.now()
         ctx.typing()
         val endTime = Clock.System.now()

core/src/main/kotlin/io/github/null2264/tsukumogami/core/Bot.kt

@@ -34,18 +34,28 @@ open class Bot internal constructor(): IGroup {
         _prefixes.add(prefix)
     }
 
-    fun addCommand(command: Command) {
-        if (allCommands.containsKey(command.name)) {
+    private fun addCommand(name: String, command: Command) {
+        if (allCommands.containsKey(name)) {
             throw IllegalStateException("Duplicate command: '${command.name}'")
         }
         allCommands[command.name] = command
     }
 
-    fun removeCommand(command: Command) {
-        if (!allCommands.containsKey(command.name)) {
-            throw IllegalStateException("Command not found: '${command.name}'")
+    fun addCommand(command: Command) {
+        addCommand(command.name, command)
+        command.alias.forEach { addCommand(it, command) }
+    }
+
+    private fun removeCommand(name: String) {
+        if (!allCommands.containsKey(name)) {
+            throw IllegalStateException("Command not found: '${name}'")
         }
-        allCommands.remove(command.name)
+        allCommands.remove(name)
+    }
+
+    fun removeCommand(command: Command) {
+        removeCommand(command.name)
+        command.alias.forEach { removeCommand(it) }
     }
 
     open suspend fun start() {
@@ -67,9 +77,10 @@ open class Bot internal constructor(): IGroup {
     fun getCommand(name: String?) = allCommands[name]
 
     private fun getContext(message: Message): Context {
-        val candidate = message.content.parsePrefixCommandAndArguments()
-        val context = Context(this, message, candidate?.first, candidate?.second?.toMutableList())
-        context.command = getCommand(context.pullCandidateOrNull())
+        val parsed = message.content.parsePrefixAndCommand()
+        val context = Context(this, message, parsed?.first)
+        context.command = getCommand(parsed?.second)
+        if (context.command != null) context.invokedWith = parsed?.second
         return context
     }
 
@@ -99,17 +110,18 @@ open class Bot internal constructor(): IGroup {
         Logger.i { "Online! ${client.getSelf().username}" }
     }
 
-    private fun String.parsePrefixCommandAndArguments(): Pair<String, List<String>>? {
+    private fun String.parsePrefixAndCommand(): Pair<String, String>? {
         if (this.isBlank()) return null
 
-        var ret: Pair<String, List<String>>? = null
+        var ret: Pair<String, String>? = null
 
-        prefixes.forEach {
-            if (this.substring(0, it.length) == it) {
-                val prefix = this.substring(0, it.length)
-                val cleanPrompt = this.substring(it.length)
-                ret = Pair(prefix, cleanPrompt.parseCommandAndArguments())
-                return@forEach
+        run {
+            prefixes.forEach { candidate ->
+                val prefix = this.substring(0, candidate.length)
+                if (prefix != candidate) { return@forEach }
+                val command = this.drop(candidate.length).substringBefore(' ')
+                ret = prefix to command
+                return@run
             }
         }
 

core/src/main/kotlin/io/github/null2264/tsukumogami/core/Context.kt

@@ -8,34 +8,30 @@ import io.github.null2264.tsukumogami.core.commands.Command
 
 class Context(
     val bot: Bot,
-    private val message: Message,
+    val message: Message,
     /**
      * The prefix that used to invoke the command
      */
     val prefix: String?,
-    /**
-     * Potential command name and/or arguments
-     */
-    val candidate: MutableList<String>?,
 ) {
 
     /**
      * The user that invoked the command
+     *
+     * Alias to [Message.author]
      */
     val author get() = message.author
 
+    /**
+     * The text that invoked the command
+     */
+    var invokedWith: String? = null
+
     /**
      * The command that currently being invoked
      */
     var command: Command? = null
 
-    fun getCandidateOrNull() = candidate?.getOrNull(0)
-    fun pullCandidateOrNull() = candidate?.removeFirstOrNull()
-    fun pullCandidateIf(predicate: () -> Boolean): String? {
-        if (predicate()) return candidate?.removeFirstOrNull()
-        return null
-    }
-
     suspend fun send(content: String) = message.channel.createMessage(content)
 
     suspend fun reply(content: String, mentionsAuthor: Boolean = false) = message.channel.createMessage {
@@ -48,4 +44,15 @@ class Context(
     }
 
     suspend fun typing() = message.channel.type()
+
+    fun parseArguments(): MutableList<String>? =
+        if (prefix != null && invokedWith != null) {
+            message.content
+                .substringAfter("$prefix$invokedWith")
+                .trim()
+                .split(' ')
+                .toMutableList()
+        } else {
+            null
+        }
 }

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

@@ -17,7 +17,7 @@ abstract class Arguments {
     }
 
     suspend fun parse(context: Context) {
-        val currentValues = context.candidate?.toMutableList()
+        val currentValues = context.parseArguments()
 
         run {
             args.forEach { arg ->

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

@@ -19,9 +19,13 @@ class Group(
     override val allCommands: MutableMap<String, Command> = mutableMapOf()
 
     override suspend fun invoke(context: Context) {
-        val command = allCommands[context.getCandidateOrNull()]
-        context.pullCandidateIf { command != null } ?: return
-        context.command = command!!
+        val subcommandName = context.message.content
+            .substringAfter("${context.prefix}${context.invokedWith}")
+            .trim()
+            .substringBefore(' ')
+        val command = allCommands[subcommandName] ?: return
+        context.invokedWith += " $subcommandName"
+        context.command = command
         command.invoke(context)
     }
 }

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

@@ -9,7 +9,6 @@ interface IGroup {
 
     private fun addCommand(command: Command) {
         allCommands[command.name] = command
-        command.alias.forEach { allCommands[it] = command }
     }
 
     fun commands(