#!/usr/bin/env node

const fs = require("fs");
const path = require("path");

const inputFiles = [
  "binding.c",
  "binding.js",
  "exports.txt",
  "imports.js",
  "prefix.js",
  ...list("../include/tree_sitter"),
  ...list("../src"),
];

const outputFiles = ["tree-sitter.js", "tree-sitter.wasm"];

const outputMtime = Math.min(...outputFiles.map(mtime));

for (const inputFile of inputFiles) {
  if (mtime(inputFile) > outputMtime) {
    console.log(`File '${inputFile}' has changed. Re-run 'script/build-wasm'.`);
    process.exit(1);
  }
}

function list(dir) {
  return fs
    .readdirSync(path.join(__dirname, dir), "utf8")
    .filter((p) => !p.startsWith("."))
    .map((p) => path.join(dir, p));
}

function mtime(p) {
  return fs.statSync(path.join(__dirname, p)).mtime;
}