Cache commands to determine syncing on start

Author: Snazzah

.gitignore

@@ -13,3 +13,4 @@ logs/
 !.vscode/extensions.json
 .env
 dist/
+.command_cache.json

src/index.ts

@@ -2,6 +2,7 @@ import { SlashCreator, FastifyServer } from 'slash-create';
 import path from 'path';
 import dotenv from 'dotenv';
 import { loadExtractors } from './media';
+import { cacheCommands } from './util';
 
 let dotenvPath = path.join(process.cwd(), '.env');
 if (path.parse(process.cwd()).name === 'dist') dotenvPath = path.join(process.cwd(), '..', '.env');
@@ -34,11 +35,12 @@ creator
 start()
   .then(() => loadExtractors())
   .then(() => {
-    creator
-      .withServer(new FastifyServer())
-      .registerCommandsIn(path.join(__dirname, 'commands'))
-      .syncCommands()
-      .startServer();
+    creator.withServer(new FastifyServer()).registerCommandsIn(path.join(__dirname, 'commands'));
+
+    if (cacheCommands(creator)) {
+      logger.info('Cache updated, syncing...');
+      creator.syncCommands();
+    }
 
     if (process.env.TEST_GUILD) {
       const alreadySynced = !!creator.commands.find(
@@ -51,6 +53,8 @@ start()
           .then(() => logger.info(`Synced test guild!`))
           .catch((e) => logger.error(`Failed to sync test guild!`, e));
     }
+
+    creator.startServer();
   });
 
 // This should serve in localhost:8020/interactions

src/util.ts

@@ -1,5 +1,6 @@
 import * as path from 'path';
 import * as fs from 'fs';
+import { SlashCreator } from 'slash-create';
 
 /**
  * Iterates through a folder and calls back on every .js found.
@@ -38,3 +39,26 @@ export async function iterateFolder(
 export function randint(min: number, max: number) {
   return Math.floor(Math.random() * (max - min + 1)) + min;
 }
+
+/**
+ * Caches commands to a file.
+ * @param creator The creator to cache commands from
+ * @returns Whether the cache has updated
+ */
+export function cacheCommands(creator: SlashCreator) {
+  let cache = '';
+
+  if (fs.existsSync('../.command_cache.json')) cache = fs.readFileSync('../.command_cache.json', { encoding: 'utf-8' });
+
+  const currentCache = JSON.stringify(
+    creator.commands.map((cmd) => ({
+      ...cmd.commandJSON,
+      guildIDs: cmd.guildIDs
+    }))
+  );
+
+  if (cache === currentCache) return false;
+
+  fs.writeFileSync('../.command_cache.json', currentCache);
+  return true;
+}