refactor(cli): replace external editor with inline terminal editing

index.ts

@@ -1,9 +1,6 @@
 #!/usr/bin/env bun
 
 import * as readline from "node:readline";
-import { tmpdir } from "node:os";
-import { join } from "node:path";
-import { unlink } from "node:fs/promises";
 import { loadConfig, saveConfig } from "./src/config";
 import {
   isGitRepo,
@@ -108,38 +105,152 @@ async function confirmCommit(message: string): Promise<"y" | "n" | "e"> {
 }
 
 async function editMessage(current: string): Promise<string | null> {
-  const tmpPath = join(tmpdir(), `gai-msg-${Date.now()}`);
+  if (!process.stdin.isTTY) return null;
 
-  const header = `# Edit commit message below. Save and close to confirm.\n# Delete all lines to abort.\n`;
+  process.stdout.write(`  ${DIM}Edit message (Enter to confirm, Esc to abort):${RESET}\n`);
-  await Bun.write(tmpPath, header + current);
 
-  const editor =
+  const savedRaw = process.stdin.isRaw;
-    process.env.VISUAL ||
+  process.stdin.setRawMode(true);
-    process.env.EDITOR ||
+  process.stdin.resume();
-    (process.platform === "darwin" ? "vi" : "nano");
 
-  const proc = Bun.spawn([editor, tmpPath], {
+  let buffer = current;
-    stdout: "inherit",
+  let cursor = current.length;
-    stderr: "inherit",
+  const ESC = "\x1b";
-    stdin: "inherit",
+  const ENTER = "\r";
-  });
+  const CTRL_C = "\x03";
+  const BACKSPACE = "\x7f";
+  const DELETE = "\x1b[3~";
+  const LEFT = "\x1b[D";
+  const RIGHT = "\x1b[C";
+  const HOME = "\x1b[H" /* or \x01 */;
+  const END = "\x1b[F" /* or \x05 */;
 
-  const exitCode = await proc.exited;
+  function render() {
-  if (exitCode !== 0) {
+    process.stdout.write("\x1b[2K\r  > " + buffer);
-    await unlink(tmpPath).catch(() => {});
+    if (cursor < buffer.length) {
-    return null;
+      process.stdout.write(`\x1b[${buffer.length - cursor}D`);
+    }
   }
 
-  const content = await Bun.file(tmpPath).text();
+  process.stdout.write("  > ");
-  await unlink(tmpPath).catch(() => {});
+  process.stdout.write(buffer);
 
-  const lines = content
+  return new Promise((resolve) => {
-    .split("\n")
+    let escapeBuf = "";
-    .filter((line) => !line.startsWith("#"))
-    .join("\n")
-    .trim();
 
-  return lines || null;
+    function handleSeq(seq: string) {
+      if (seq === "\x1b[D" || seq === "\x1bOD") {
+        if (cursor > 0) {
+          cursor--;
+          process.stdout.write("\x1b[D");
+        }
+      } else if (seq === "\x1b[C" || seq === "\x1bOC") {
+        if (cursor < buffer.length) {
+          cursor++;
+          process.stdout.write("\x1b[C");
+        }
+      } else if (seq === "\x1b[H" || seq === "\x1b[1~" || seq === "\x1bOH") {
+        if (cursor > 0) {
+          process.stdout.write(`\x1b[${cursor}D`);
+          cursor = 0;
+        }
+      } else if (seq === "\x1b[F" || seq === "\x1b[4~" || seq === "\x1bOF") {
+        if (cursor < buffer.length) {
+          process.stdout.write(`\x1b[${buffer.length - cursor}C`);
+          cursor = buffer.length;
+        }
+      } else if (seq === "\x1b[3~") {
+        if (cursor < buffer.length) {
+          buffer = buffer.slice(0, cursor) + buffer.slice(cursor + 1);
+          render();
+        }
+      }
+    }
+
+    process.stdin.on("data", (data: Buffer) => {
+      const key = data.toString();
+
+      if (key === CTRL_C) {
+        process.stdin.setRawMode(savedRaw === true);
+        process.stdin.pause();
+        process.stdin.removeAllListeners("data");
+        process.stdout.write("\n");
+        resolve(null);
+        return;
+      }
+
+      if (key === ESC || key.startsWith("\x1b[")) {
+        escapeBuf = key;
+        if (key.length >= 3) {
+          handleSeq(key);
+          escapeBuf = "";
+        }
+        return;
+      }
+
+      if (escapeBuf) {
+        escapeBuf += key;
+        if (/^[A-Za-z~]$/.test(key)) {
+          handleSeq(escapeBuf);
+          escapeBuf = "";
+        } else if (escapeBuf.length > 8) {
+          escapeBuf = "";
+        }
+        return;
+      }
+
+      if (key === ENTER) {
+        process.stdin.setRawMode(savedRaw === true);
+        process.stdin.pause();
+        process.stdin.removeAllListeners("data");
+        process.stdout.write("\n");
+        const result = buffer.trim();
+        resolve(result || null);
+        return;
+      }
+
+      if (key === BACKSPACE) {
+        if (cursor > 0) {
+          buffer = buffer.slice(0, cursor - 1) + buffer.slice(cursor);
+          cursor--;
+          render();
+        }
+        return;
+      }
+
+      if (key === "\x01") {
+        if (cursor > 0) {
+          process.stdout.write(`\x1b[${cursor}D`);
+          cursor = 0;
+        }
+        return;
+      }
+      if (key === "\x05") {
+        if (cursor < buffer.length) {
+          process.stdout.write(`\x1b[${buffer.length - cursor}C`);
+          cursor = buffer.length;
+        }
+        return;
+      }
+      if (key === "\x0b") {
+        buffer = buffer.slice(0, cursor);
+        render();
+        return;
+      }
+      if (key === "\x15") {
+        buffer = buffer.slice(cursor);
+        cursor = 0;
+        render();
+        return;
+      }
+
+      if (key.charCodeAt(0) >= 32 && key.charCodeAt(0) < 127) {
+        buffer = buffer.slice(0, cursor) + key + buffer.slice(cursor);
+        cursor++;
+        render();
+      }
+    });
+  });
 }
 
 async function main() {