Add {{lastMessageId}} macro, make async slash command handlers wait for completion

public/script.js

@@ -1661,6 +1661,20 @@ function scrollChatToBottom() {
     }
 }
 
+/**
+ * Returns the ID of the last message in the chat.
+ * @returns {string} The ID of the last message in the chat.
+ */
+function getLastMessageId() {
+    const index = chat?.length - 1;
+
+    if (!isNaN(index) && index >= 0) {
+        return String(index);
+    }
+
+    return '';
+}
+
 /**
  * Substitutes {{macro}} parameters in a string.
  * @param {string} content - The string to substitute parameters in.
@@ -1690,6 +1704,7 @@ function substituteParams(content, _name1, _name2, _original, _group) {
     content = content.replace(/{{char}}/gi, _name2);
     content = content.replace(/{{charIfNotGroup}}/gi, _group);
     content = content.replace(/{{group}}/gi, _group);
+    content = content.replace(/{{lastMessageId}}/gi, getLastMessageId());
 
     content = content.replace(/<USER>/gi, _name1);
     content = content.replace(/<BOT>/gi, _name2);
@@ -1885,12 +1900,12 @@ export async function generateQuietPrompt(quiet_prompt, quietToLoud, skipWIAN) {
         });
 }
 
-function processCommands(message, type) {
+async function processCommands(message, type) {
     if (type == "regenerate" || type == "swipe" || type == 'quiet') {
         return null;
     }
 
-    const result = executeSlashCommands(message);
+    const result = await executeSlashCommands(message);
     $("#send_textarea").val(result.newText).trigger('input');
 
     // interrupt generation if the input was nothing but a command
@@ -2405,7 +2420,7 @@ async function Generate(type, { automatic_trigger, force_name2, resolve, reject,
 
     message_already_generated = isImpersonate ? `${name1}: ` : `${name2}: `;
 
-    const interruptedByCommand = processCommands($("#send_textarea").val(), type);
+    const interruptedByCommand = await processCommands($("#send_textarea").val(), type);
 
     if (interruptedByCommand) {
         $("#send_textarea").val('').trigger('input');
@@ -4457,7 +4472,13 @@ function saveChatDebounced() {
 
 async function saveChat(chat_name, withMetadata, mesId) {
     const metadata = { ...chat_metadata, ...(withMetadata || {}) };
-    let file_name = chat_name ?? characters[this_chid].chat;
+    let file_name = chat_name ?? characters[this_chid]?.chat;
+
+    if (!file_name) {
+        console.warn('saveChat called without chat_name and no chat file found');
+        return;
+    }
+
     characters[this_chid]['date_last_chat'] = Date.now();
     chat.forEach(function (item, i) {
         if (item["is_group"]) {

public/scripts/slash-commands.js

@@ -681,7 +681,7 @@ function setBackgroundCallback(_, bg) {
     }
 }
 
-function executeSlashCommands(text) {
+async function executeSlashCommands(text) {
     if (!text) {
         return false;
     }
@@ -706,8 +706,12 @@ function executeSlashCommands(text) {
             continue;
         }
 
+        if (result.value && typeof result.value === 'string') {
+            result.value = substituteParams(result.value.trim());
+        }
+
         console.debug('Slash command executing:', result);
-        result.command.callback(result.args, result.value);
+        await result.command.callback(result.args, result.value);
 
         if (result.command.interruptsGeneration) {
             interrupt = true;

public/scripts/templates/macros.html

@@ -4,6 +4,7 @@ System-wide Replacement Macros:
     <li><tt>&lcub;&lcub;char&rcub;&rcub;</tt> - the Character's name</li>
     <li><tt>&lcub;&lcub;input&rcub;&rcub;</tt> - the user input</li>
     <li><tt>&lcub;&lcub;// (note)&rcub;&rcub;</tt> - you can leave a note here, and the macro will be replaced with blank content. Not visible for the AI.</li>
+    <li><tt>&lcub;&lcub;lastMessageId&rcub;&rcub;</tt> - index # of the latest chat message. Useful for slash command batching.</li>
     <li><tt>&lcub;&lcub;time&rcub;&rcub;</tt> - the current time</li>
     <li><tt>&lcub;&lcub;date&rcub;&rcub;</tt> - the current date</li>
     <li><tt>&lcub;&lcub;weekday&rcub;&rcub;</tt> - the current weekday</li>