refactor: setup utils file (#50)

src/utils.ts

@@ -0,0 +1,27 @@
+import { Configuration, OpenAIApi } from 'openai';
+
+export const generateCommitMessage = async (
+	apiKey: string,
+	prompt: string,
+) => {
+	const openai = new OpenAIApi(new Configuration({ apiKey }));
+	try {
+		const completion = await openai.createCompletion({
+			model: 'text-davinci-003',
+			prompt,
+			temperature: 0.7,
+			top_p: 1,
+			frequency_penalty: 0,
+			presence_penalty: 0,
+			max_tokens: 200,
+			stream: false,
+			n: 1,
+		});
+
+		return completion.data.choices[0].text!.trim().replace(/[\n\r]/g, '');
+	} catch (error) {
+		const errorAsAny = error as any;
+		errorAsAny.message = `OpenAI API Error: ${errorAsAny.message} - ${errorAsAny.response.statusText}`;
+		throw errorAsAny;
+	}
+};