(function node() {
    apps.readMethod = function node_apps_readMethod(diff) {
        if (options.source === "") {
            apps.errout([
                `Pretty Diff requires option ${text.cyan}source${text.none} when using command ${text.green + command + text.none}. Example:`,
                `${text.cyan}prettydiff ${command} source:"myFile.js"${text.none}`
            ]);
            return;
        }
    }
}())