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.

index.js

const call = (cmd, options = DEFAULTS) => new Promise(
    (resolve, reject) => {
        cmd = cmd.split(' ');
        spawn(cmd.shift(), cmd, options)
            .on('exit', resolve)
            .on('error', reject);
    }
);

const sequential = async (cmds, options) => {
    for (const cmd of cmds) {
        await call(cmd, options);
    }
}

Footnotes

By default, the options { stdio: 'inherit' } are passed, largely so stdout is visible. These can be overridden in the second argument to either call or sequential.