add gitignore check

src/utils/add-gitignore.ts

@@ -0,0 +1,33 @@
+import fs from 'node:fs';
+import path from 'node:path';
+import { credentialFile, tempDir } from './constants';
+
+export function addGitIgnore() {
+  const shouldIgnore = [credentialFile, tempDir];
+
+  const gitignorePath = path.join(process.cwd(), '.gitignore');
+
+  if (!fs.existsSync(gitignorePath)) {
+    return;
+  }
+
+  const gitignoreContent = fs.readFileSync(gitignorePath, 'utf-8');
+
+  const gitignoreLines = gitignoreContent.split('\n');
+
+  for (const line of gitignoreLines) {
+    const index = shouldIgnore.indexOf(line);
+    if (index !== -1) {
+      shouldIgnore.splice(index, 1);
+    }
+  }
+
+  if (shouldIgnore.length > 0) {
+    for (const line of shouldIgnore) {
+      gitignoreLines.push(line);
+      console.log(`Added ${line} to .gitignore`);
+    }
+
+    fs.writeFileSync(gitignorePath, gitignoreLines.join('\n'));
+  }
+}