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/**
* Import managment base, used to load commands/protocol and configuration objects
*
* Version: v2.0.0
* Developer: Marzavec ( https://github.com/marzavec )
* License: WTFPL ( http://www.wtfpl.net/txt/copying/ )
*
*/
'use strict';
const read = require('readdir-recursive');
const path = require('path');
class ImportsManager {
/**
* Create a `ImportsManager` instance for (re)loading classes and config
*
* @param {Object} core reference to the global core object
* @param {String} base executing directory name; __dirname
*/
constructor (core, base) {
this._core = core;
this._base = base;
this._imports = {};
this._optionalConfigs = {};
}
/**
* Pull core reference
*
* @type {Object} readonly
*/
get core () {
return this._core;
}
/**
* Pull base path that all imports are required in from
*
* @type {String} readonly
*/
get base () {
return this._base;
}
/**
* Pull optional (none-core) config options
*
* @type {Object}
*/
get optionalConfigs () {
return Object.assign({}, this._optionalConfigs);
}
/**
* Initialize this class and start loading target directories
*
*/
init () {
let errorText = '';
ImportsManager.load_dirs.forEach(dir => {
errorText += this.loadDir(dir);
});
return errorText;
}
/**
* Gather all js files from target directory, then verify and load
*
* @param {String} dirName The name of the dir to load, relative to the _base path.
*/
loadDir (dirName) {
const dir = path.resolve(this._base, dirName);
let errorText = '';
try {
read.fileSync(dir).forEach(file => {
const basename = path.basename(file);
if (basename.startsWith('_') || !basename.endsWith('.js')) return;
let imported;
try {
imported = require(file);
} catch (e) {
let err = `Unable to load modules from ${dirName} (${path.relative(dir, file)})\n${e}`;
errorText += err;
console.error(err);
return errorText;
}
if (imported.configs) {
imported.configs.forEach(config => {
this._optionalConfigs[config.name] = config;
});
}
if (!this._imports[dirName]) {
this._imports[dirName] = {};
}
this._imports[dirName][file] = imported;
});
} catch (e) {
let err = `Unable to load modules from ${dirName}\n${e}`;
errorText += err;
console.error(err);
return errorText;
}
return errorText;
}
/**
* Unlink references to each loaded module, pray to google that gc knows it's job,
* then reinitialize this class to start the reload
*
* @param {String} dirName The name of the dir to load, relative to the _base path.
*/
reloadDirCache (dirName) {
Object.keys(this._imports[dirName]).forEach((mod) => {
delete require.cache[require.resolve(mod)];
});
return this.init();
}
/**
* Pull reference to imported modules that were imported from dirName, or
* load required directory if not found
*
* @param {String} dirName The name of the dir to load, relative to the _base path.
*/
getImport (dirName) {
let imported = this._imports[dirName];
if (!imported) {
this.loadDir(dirName);
}
return Object.assign({}, this._imports[dirName]);
}
}
// automagically loaded directorys on instantiation
ImportsManager.load_dirs = ['src/commands'];
module.exports = ImportsManager;
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