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'use strict';

const fork = require('child_process').fork;

const path = require('path');

const CLI = require('./_cli.js');

//

// Parse arguments

//

const cli = CLI(`usage: ./node scatter.js [options] [--] <filename>

Run the benchmark script <filename> many times and output the rate (ops/s)

together with the benchmark variables as a csv.

--runs 30 number of samples

--set variable=value set benchmark variable (can be repeated)

`, { arrayArgs: ['set'] });

if (cli.items.length !== 1) {

cli.abort(cli.usage);

return;

}

// Create queue from the benchmarks list such both node versions are tested

// `runs` amount of times each.

const filepath = path.resolve(cli.items[0]);

const name = filepath.slice(__dirname.length + 1);

const runs = cli.optional.runs ? parseInt(cli.optional.runs, 10) : 30;

let printHeader = true;

function csvEncodeValue(value) {

if (typeof value === 'number') {

return value.toString();

} else {

return `"${value.replace(/"/g, '""')}"`;

}

}

(function recursive(i) {

const child = fork(path.resolve(__dirname, filepath), cli.optional.set);

child.on('message', function(data) {

if (data.type !== 'report') {

return;

}

// print csv header

if (printHeader) {

const confHeader = Object.keys(data.conf)

.map(csvEncodeValue)

.join(', ');

console.log(`"filename", ${confHeader}, "rate", "time"`);

printHeader = false;

}

// print data row

const confData = Object.keys(data.conf)

.map((key) => csvEncodeValue(data.conf[key]))

.join(', ');

console.log(`"${name}", ${confData}, ${data.rate}, ${data.time}`);

});

child.once('close', function(code) {

if (code) {

process.exit(code);

return;

}

// If there are more benchmarks execute the next

if (i + 1 < runs) {

recursive(i + 1);

}

});

})(0);