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const fs = require("fs");

const { performance } = require("perf_hooks");

const { exec, spawn } = require("child_process");

// TODO: Perhaps we could trigger a transpile process from here

const [name, src = "js"] = process.argv.slice(2);

const testPath = `tests/${name}.in`;

const target = `${src}/${name}`;

const expectedScriptName = `${name}.js`;

// given the file name

if (name) {

fs.readFile(testPath, "utf-8", (err, tests) => {

if (err) return console.log("Test file not found", err);

// check if build/name is a thing

fs.readdir(`${src}/`, (err, files) => {

if (err) return console.log("Did you transpile?", err);

// check if the build has the expected script name

if (files.includes(expectedScriptName)) {

// setup spawn

const startTime = performance.now();

const child = spawn("node", [target]);

// prepare the encoding and pipe

child.stdin.setEncoding("utf-8");

child.stdout.pipe(process.stdout);

// write the actual data

child.stdin.write(tests);

// measure memory

memUsage(child);

// end process

child.stdin.end();

child.on("exit", code => {

const time = (performance.now() - startTime) / 1000;

console.log("Run Time:", time, "s");

console.log("Exit Code:", code);

});

} else {

// Exit, there was a problem with the script name

console.log(`Make sure the file script exists as ${name}.js`);

}

});

} else {

// Exit, no name was given

console.log("A name is required.");

}

function memUsage(child) {

exec("ps -p" + child.pid + " -o vsize=", function(err, stdout, stderr) {

const fail = err || stderr;

if (fail) {

return console.log("Failure while measuring memory");

}

const memory = parseInt(stdout, 10);

return console.log("Memory:", memory, "kilobytes");

});

}