// @ts-check

const cp = require("child_process");

const log = require("fancy-log"); // was `require("gulp-util").log (see https://github.com/gulpjs/gulp-util)

const isWin = /^win/.test(process.platform);

const chalk = require("./chalk");

const { CancelToken, CancelError } = require("./cancellation");

module.exports = exec;

/**

* Executes the provided command once with the supplied arguments.

* @param {string} cmd

* @param {string[]} args

* @param {ExecOptions} [options]

*

* @typedef ExecOptions

* @property {boolean} [ignoreExitCode]

* @property {CancelToken} [cancelToken]

*/

function exec(cmd, args, options = {}) {

return /**@type {Promise<{exitCode: number}>}*/(new Promise((resolve, reject) => {

log(`> ${chalk.green(cmd)} ${args.join(" ")}`);

// TODO (weswig): Update child_process types to add windowsVerbatimArguments to the type definition

const subshellFlag = isWin ? "/c" : "-c";

const command = isWin ? [possiblyQuote(cmd), ...args] : [`${cmd} ${args.join(" ")}`];

const ex = cp.spawn(isWin ? "cmd" : "/bin/sh", [subshellFlag, ...command], { stdio: "inherit", windowsVerbatimArguments: true });

const subscription = options.cancelToken && options.cancelToken.subscribe(() => {

ex.kill("SIGINT");

ex.kill("SIGTERM");

reject(new CancelError());

});

ex.on("exit", exitCode => {

subscription && subscription.unsubscribe();

if (exitCode === 0 || options.ignoreExitCode) {

resolve({ exitCode });

}

else {

reject(new Error(`Process exited with code: ${exitCode}`));

}

});

ex.on("error", error => {

subscription && subscription.unsubscribe();

reject(error);

});

}));

}

/**

* @param {string} cmd

*/

function possiblyQuote(cmd) {

return cmd.indexOf(" ") >= 0 ? `"${cmd}"` : cmd;

}