Script to convert Vscode theme to Ghostty terminal theme

convert.ts

#!/usr/bin/env bun
import fs from "fs";
import { parse } from "jsonc-parser";

// Usage
// bun convert.ts <file>.jsonc <themne-name>.conf
// You get your jsonc file from Developer: Generate Color Theme from Current Settings on Vscode command pallete

if (process.argv.length < 3) {
  console.error("Usage: convert.ts <vscode-theme.jsonc> [output.ghostty]");
  process.exit(1);
}

const inFile = process.argv[2];
const outFile = process.argv[3] || inFile.replace(/\.(jsonc|json)$/, ".ghostty");

const text = fs.readFileSync(inFile, "utf-8");
const errors: any[] = [];
const theme = parse(text, errors, { allowTrailingComma: true, disallowComments: false });
if (errors.length > 0) {
  console.error("JSONC parse errors:", errors);
  process.exit(1);
}

// map 16 ANSI colors from `colors` object
const ansiNames = [
  "Black","Red","Green","Yellow","Blue","Magenta","Cyan","White",
  "BrightBlack","BrightRed","BrightGreen","BrightYellow","BrightBlue","BrightMagenta","BrightCyan","BrightWhite"
];
const ansiPalette = ansiNames.map(name =>
  theme.colors?.[`terminal.ansi${name}`] ?? "#000000"
);

const bg = theme.colors?.["editor.background"] ?? "#000000";
const fg = theme.colors?.["editor.foreground"] ?? "#ffffff";
const cursor = theme.colors?.["editorCursor.foreground"] ?? fg;
const selBg = theme.colors?.["editor.selectionBackground"] ?? bg;
const selFg = fg;

const lines = ansiPalette.map((c, i) => `palette = ${i}=${c}`);
lines.push(`background = ${bg}`, `foreground = ${fg}`, `cursor-color = ${cursor}`);
lines.push(`cursor-text = ${fg}`, `selection-background = ${selBg}`, `selection-foreground = ${selFg}`);

fs.writeFileSync(outFile, lines.join("\n") + "\n");
console.log("Written to", outFile);