const child_process = require("child_process");

const spawnExec = (cmds,opts={}) => {
    let cmd = cmds[0];
    let proc = child_process.spawn(cmd, cmds.slice(1), opts);
    
    console.log(cmds.join(' '))

    return new Promise(function (resolve, reject) {
        let stdout = [];
        let stderr = [];
        proc.stdout.on("data", function (buf) {
            stdout.push(buf);
            // 回调函数
            opts.stdout && opts.stdout(buf);
        });
        proc.stderr.on("data", function (buf) {
            stderr.push(buf);
            // 回调函数
            opts.stderr && opts.stderr(buf);
        });
        proc.on("exit", function (code) {
            let stdoutAll = Buffer.concat(stdout);
            let stderrAll = Buffer.concat(stderr);
   
            // 回调函数
            opts.exit && opts.exit(code);

            code ? reject({
                code,
                stdout: stdoutAll.toString(),
                stderr: stderrAll.toString()
            }) : resolve({
                stdout: stdoutAll.toString(),
                stderr: stderrAll.toString()
            });
        });
    });
}

module.exports = spawnExec