Add autocomplete for slash commands

public/scripts/slash-commands.js

@@ -41,7 +41,7 @@ export {
 class SlashCommandParser {
     constructor() {
         this.commands = {};
-        this.helpStrings = [];
+        this.helpStrings = {};
     }
 
     addCommand(command, callback, aliases, helpString = '', interruptsGeneration = false, purgeFromMessage = true) {
@@ -64,7 +64,7 @@ class SlashCommandParser {
             let aliasesString = `(alias: ${aliases.map(x => `<span class="monospace">/${x}</span>`).join(', ')})`;
             stringBuilder += aliasesString;
         }
-        this.helpStrings.push(stringBuilder);
+        this.helpStrings[command] = stringBuilder;
     }
 
     parse(text) {
@@ -108,7 +108,12 @@ class SlashCommandParser {
     }
 
     getHelpString() {
-        const listItems = this.helpStrings.map(x => `<li>${x}</li>`).join('\n');
+        const listItems = Object
+            .entries(this.helpStrings)
+            .sort((a, b) => a[0].localeCompare(b[0]))
+            .map(x => x[1])
+            .map(x => `<li>${x}</li>`)
+            .join('\n');
         return `<p>Slash commands:</p><ol>${listItems}</ol>
         <small>Slash commands can be batched into a single input by adding a pipe character | at the end, and then writing a new slash command.</small>
         <ul><li><small>Example:</small><code>/cut 1 | /sys Hello, | /continue</code></li>
@@ -717,3 +722,42 @@ function executeSlashCommands(text) {
 
     return { interrupt, newText };
 }
+
+function setSlashCommandAutocomplete(textarea) {
+    textarea.autocomplete({
+        source: (input, output) => {
+            // Only show for slash commands and if there's no space
+            if (!input.term.startsWith('/') || input.term.includes(' ')) {
+                output([]);
+                return;
+            }
+
+            const slashCommand = input.term.toLowerCase().substring(1); // Remove the slash
+            const result = Object
+                .keys(parser.helpStrings) // Get all slash commands
+                .filter(x => x.startsWith(slashCommand)) // Filter by the input
+                .sort((a, b) => a.localeCompare(b)) // Sort alphabetically
+                // .slice(0, 20) // Limit to 20 results
+                .map(x => ({ label: parser.helpStrings[x], value: `/${x} ` })); // Map to the help string
+
+            output(result); // Return the results
+        },
+        select: (e, u) => {
+            // unfocus the input
+            $(e.target).val(u.item.value);
+        },
+        minLength: 1,
+        position: { my: "left bottom", at: "left top", collision: "none" },
+    });
+
+    textarea.autocomplete("instance")._renderItem = function (ul, item) {
+        const width = $(textarea).innerWidth();
+        const content = $('<div></div>').html(item.label);
+        return $("<li>").width(width).append(content).appendTo(ul);
+    };
+}
+
+jQuery(function () {
+    const textarea = $('#send_textarea');
+    setSlashCommandAutocomplete(textarea);
+})