call-bash

call-bash

A simple utility for using child_process.spawn inside of a Promise wrapper.

Allows for the await call(...) pattern, initially developed to play nice with the ora package, i.e.:

const ora = require('ora');
const {
    call,
    sequential
} = require('call-bash');

async function test() {
    const spinner = ora('Starting...').start();

    try {
        await call('do-task arg1 arg2');
    } catch (e) {
        return spinner.fail('Something went wrong!');
    }

    spinner.succeed('All done!');
}

Examples

const spinner = ora('Waiting...').start();
await call('sleep 1');
spinner.succeed('All done!');

Will call bash (non-blocking) and run the spinner for 1 second, then exit.

const spinner = ora('Waiting...').start();
await sequential([
    'echo "Hello"',
    'echo "World"'
]);
spinner.succeed('All done!');

Outputs:

"Hello"
"World"
✔ All done!

Source

The package simply wraps the child_process.spawn call in a Promise which is resolved on exit and rejected on error. Multiple commands may be passed in, and they will be executed in sequential order.

index.js

const callBash = async (...cmds) => {
    for (let cmd of cmds) {
        cmd = cmd.split(' ');
        await new Promise((resolve, reject) => {
            spawn(cmd.shift(), cmd, global.SPAWN_OPTIONS || DEFAULTS)
                .on('exit', resolve)
                .on('error', reject);
        });
    }
}

Footnotes

The options { stdio: 'inherit' } are passed to spawn by default, and stdout will be visible. For the sake of simplicity, the only arguments callBash takes are commands, but you can override this setting with global.SPAWN_OPTIONS if necessary.