refactor: replace Bun APIs with Node.js equivalents

Replace Bun.argv with process.argv, Bun.file() with fs/promises,
Bun.stringWidth with string-width package, and Bun.wrapAnsi with
wrap-ansi package for better compatibility.

src/config/index.ts

@@ -1,9 +1,10 @@
+import fs from "node:fs/promises";
 import os from "node:os";
 import { autocomplete, intro, isCancel, outro, text } from "@clack/prompts";
 import chalk from "chalk";
 
 const home = os.homedir();
-const configFile = Bun.file(`${home}/.lmc_config.json`);
+const configPath = `${home}/.lmc_config.json`;
 
 export interface AppConfig {
   baseURL: string;
@@ -36,7 +37,7 @@ export async function initConfig(old: AppConfig | null): Promise<AppConfig> {
 
   const config = { baseURL, model } satisfies AppConfig;
 
-  await configFile.write(JSON.stringify(config, null, "  "));
+  await fs.writeFile(configPath, JSON.stringify(config, null, "  "));
 
   outro(chalk.green("Configuration saved!"));
 
@@ -63,10 +64,11 @@ export async function loadConfig(
 ): Promise<AppConfig | null> {
   let config: AppConfig;
   try {
-    config = await configFile.json();
+    const text = await fs.readFile(configPath);
+    config = JSON.parse(text.toString("utf8"));
   } catch {
     if (configFlag) return null;
-    console.error(`Config not found at ${configFile.name}`);
+    console.error(`Config not found at ${configPath}`);
     return null;
   }
 

src/conversation/index.ts

@@ -1,8 +1,9 @@
+import fs from "node:fs/promises";
 import os from "node:os";
 import type { ModelMessage } from "ai";
 
 const home = os.homedir();
-const convoFile = Bun.file(`${home}/.lmc_convo.json`);
+const convoPath = `${home}/.lmc_convo.json`;
 
 export interface IConversation {
   model: string;
@@ -16,7 +17,8 @@ export class Conversation implements IConversation {
 
   async load() {
     try {
-      const convo: IConversation = await convoFile.json();
+      const text = await fs.readFile(convoPath);
+      const convo: IConversation = JSON.parse(text.toString("utf8"));
       this.model = convo.model;
       this.messages = convo.messages;
     } catch {
@@ -25,7 +27,8 @@ export class Conversation implements IConversation {
   }
 
   async save() {
-    await convoFile.write(
+    await fs.writeFile(
+      convoPath,
       JSON.stringify({
         model: this.model,
         messages: this.messages,

src/render/index.ts

@@ -8,6 +8,7 @@ import type {
 } from "ai";
 import styles from "ansi-styles";
 import { chalkStderr, supportsColorStderr } from "chalk";
+import stringWidth from "string-width";
 import { renderMarkdown } from "./markdown";
 
 export default class Renderer {
@@ -40,12 +41,11 @@ export default class Renderer {
 
   private checkContainment(text: string, pipe: WriteStream = process.stdout) {
     const [columns, rows] = pipe.getWindowSize();
-    this.charsSinceNL += Bun.stringWidth(text);
+    this.charsSinceNL += stringWidth(text);
     if (text.includes("\n")) {
       this.lineCount += text.match(/\n/g)?.length ?? 1;
       this.charsSinceNL =
-        Bun.stringWidth(text) -
-        Bun.stringWidth(text.slice(0, text.lastIndexOf("\n")));
+        stringWidth(text) - stringWidth(text.slice(0, text.lastIndexOf("\n")));
     } else if (this.charsSinceNL > columns) {
       this.lineCount++;
       this.charsSinceNL = this.charsSinceNL - columns;

src/render/markdown.ts

@@ -7,7 +7,9 @@ import {
   createHighlighter,
   type HighlighterGeneric,
 } from "shiki";
+import stringWidth from "string-width";
 import terminalLink from "terminal-link";
+import wrapAnsi from "wrap-ansi";
 import { codeToANSI } from "./codeToANSI";
 
 let highlighter: HighlighterGeneric<BundledLanguage, BundledTheme> | undefined;
@@ -15,7 +17,7 @@ let highligherLangs = "";
 
 class SWCell extends Cell {
   public override get length() {
-    return Bun.stringWidth(this.toString(), { ambiguousIsNarrow: true });
+    return stringWidth(this.toString(), { ambiguousIsNarrow: true });
   }
 }
 
@@ -23,7 +25,7 @@ class LmcRenderer extends Renderer {
   private columns: number;
 
   constructor(columns: number) {
-    super();
+    super({ gfm: true });
     this.columns = columns;
   }
 
@@ -38,7 +40,7 @@ class LmcRenderer extends Renderer {
     ];
     const color = colors[depth - 1] ?? chalk.white;
     const text = this.parser.parseInline(tokens);
-    return Bun.wrapAnsi(
+    return wrapAnsi(
       color.bold(`${"#".repeat(depth)} ${text}\n\n`),
       this.columns,
       { trim: false },
@@ -47,12 +49,12 @@ class LmcRenderer extends Renderer {
 
   override paragraph({ tokens }: Tokens.Paragraph) {
     const text = this.parser.parseInline(tokens);
-    return Bun.wrapAnsi(`${text}\n\n`, this.columns, { trim: false });
+    return wrapAnsi(`${text}\n\n`, this.columns, { trim: false });
   }
 
   override blockquote({ tokens }: Tokens.Blockquote) {
     const text = this.parser.parse(tokens).trim();
-    const lines = Bun.wrapAnsi(text, this.columns - 2, { trim: false })
+    const lines = wrapAnsi(text, this.columns - 2, { trim: false })
       .replace(/\n+/g, "\n")
       .concat("\n")
       .split("\n");
@@ -96,7 +98,7 @@ class LmcRenderer extends Renderer {
     }
 
     const cols = this.columns - 2;
-    return Bun.wrapAnsi(`${marker} ${text}`, cols, { trim: false })
+    return wrapAnsi(`${marker} ${text}`, cols, { trim: false })
       .split("\n")
       .map((line) => (line.length > 0 ? `  ${line}` : ""))
       .join("\n")