core: patch: support load from local file

packages/hydrooj/src/commands/patch.ts

@@ -15,15 +15,21 @@ export function register(cli: CAC) {
             return;
         }
         logger.info('Patching %s', mod);
-        const res = await superagent.get(patch).responseType('arraybuffer');
-        logger.info('Downloaded patch');
+        let content = '';
+        if (patch.startsWith('http')) {
+            const res = await superagent.get(patch).responseType('arraybuffer');
+            logger.info('Downloaded patch');
+            content = res.body;
+        } else {
+            content = await fs.readFile(patch, 'utf-8');
+        }
         for (let i = 0; i <= 100; i++) {
             const fp = path.join(path.dirname(mod), `${path.basename(mod)}.${i}.patch`);
             if (fs.existsSync(fp)) continue;
             patch = fp;
             break;
         }
-        await fs.writeFile(patch, res.body);
+        await fs.writeFile(patch, content);
         child.execSync(`patch ${mod} -o ${mod}.tmp < ${patch}`);
         await fs.move(`${mod}.tmp`, mod, { overwrite: true });
         logger.info('Patched %s', mod);