feat(cli): add --file flag for file review and refactor prompt generation

- Inject current date into review prompts to improve LLM context accuracy
- Remove unused `module` field from package.json

src/index.ts

@@ -1,4 +1,5 @@
 #!/usr/bin/env node
+import fs from "node:fs/promises";
 import consumers from "node:stream/consumers";
 import util from "node:util";
 import { createOpenAICompatible } from "@ai-sdk/openai-compatible";
@@ -7,7 +8,7 @@ import { streamText } from "ai";
 import { initConfig, loadConfig } from "./config";
 import { Conversation } from "./conversation";
 import { handleTopLevel } from "./errors";
-import { Prompts } from "./prompts";
+import { commitDiff, file, reviewDiff, reviewFile } from "./prompts";
 import Renderer from "./render";
 
 async function main() {
@@ -29,6 +30,8 @@ async function main() {
       g: { type: "boolean" },
       review: { type: "boolean" },
       r: { type: "boolean" },
+      file: { type: "string" },
+      f: { type: "string" },
     },
     strict: true,
     allowPositionals: true,
@@ -42,6 +45,7 @@ async function main() {
   const configFlag = args.config ?? args.c;
   const messageFlag = args["git-message"] ?? args.g;
   const reviewFlag = args.review ?? args.r;
+  const fileFlag = args.file ?? args.f;
 
   if (versionFlag) {
     console.log("0.0.0");
@@ -76,10 +80,20 @@ async function main() {
   let input = positionals.join(" ").trim();
   if (input === "-") input = await consumers.text(process.stdin);
 
-  let prompt = "Introduce yourself.";
-  if (messageFlag) prompt = Prompts.commit(input);
-  else if (reviewFlag) prompt = Prompts.review(input);
-  else if (input) prompt = input;
+  let prompt = input;
+  if (messageFlag) {
+    prompt = commitDiff(input);
+  } else if (reviewFlag && fileFlag) {
+    const content = await fs.readFile(fileFlag, "utf8");
+    prompt = reviewFile(file(fileFlag, content));
+  } else if (fileFlag) {
+    const content = await fs.readFile(fileFlag, "utf8");
+    prompt = `${file(fileFlag, content)}\n\n${input}`;
+  } else if (reviewFlag) {
+    prompt = reviewDiff(input);
+  }
+
+  if (!prompt) throw new Error("No prompt given.");
 
   convo.messages.push({ role: "user", content: prompt });