source: frontend/node_modules/execa/lib/command.js

'use strict';
const normalizeArgs = (file, args = []) => {
        if (!Array.isArray(args)) {
                return [file];
        }

        return [file, ...args];
};

const NO_ESCAPE_REGEXP = /^[\w.-]+$/;
const DOUBLE_QUOTES_REGEXP = /"/g;

const escapeArg = arg => {
        if (typeof arg !== 'string' || NO_ESCAPE_REGEXP.test(arg)) {
                return arg;
        }

        return `"${arg.replace(DOUBLE_QUOTES_REGEXP, '\\"')}"`;
};

const joinCommand = (file, args) => {
        return normalizeArgs(file, args).join(' ');
};

const getEscapedCommand = (file, args) => {
        return normalizeArgs(file, args).map(arg => escapeArg(arg)).join(' ');
};

const SPACES_REGEXP = / +/g;

// Handle `execa.command()`
const parseCommand = command => {
        const tokens = [];
        for (const token of command.trim().split(SPACES_REGEXP)) {
                // Allow spaces to be escaped by a backslash if not meant as a delimiter
                const previousToken = tokens[tokens.length - 1];
                if (previousToken && previousToken.endsWith('\\')) {
                        // Merge previous token with current one
                        tokens[tokens.length - 1] = `${previousToken.slice(0, -1)} ${token}`;
                } else {
                        tokens.push(token);
                }
        }

        return tokens;
};

module.exports = {
        joinCommand,
        getEscapedCommand,
        parseCommand
};