command-reloader.js

'use strict';

/**
 * This plugin add hot command reload by watching
 * file changes on any file under `./commands` and
 * issuing a `reloadCommand` to the context.
 * This 
 */
module.exports.init = function(context, config) {
    if (process.env.NODE_ENV !== 'development') return {};

    const logger = context.getLogger(config.moduleid);

    context.once('modules.resolved', _ => {
        logger.info('Initialize command module reloader!');

        /**
         * Should we provide this as a facility at the
         * app level?
         */
        const watcher = require('chokidar');

        const commandReload = watcher.watch(context._commandspath, {
            depth: 0,
            ignoreInitial: false,
            awaitForFinish: true
        });

        // context.commandReloadWatcher = commandReload;

        commandReload.on('change', (filepath, stats) => {
            logger.info('Command updated: %s', filepath);
            context.reloadCommand(filepath, requireUncached(filepath));
        });

        function requireUncached(mdl) {
            delete require.cache[require.resolve(mdl)];
            return require(mdl);
        }
    });

    return {};
};