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import {
resolve,
basename as _basename,
relative,
} from 'path';
import RecursiveRead from 'readdir-recursive';
/**
* Import managment base, used to load commands/protocol and configuration objects
* @property {String} base - Base path that all imports are required in from
* @author Marzavec ( https://github.com/marzavec )
* @version v2.0.0
* @license WTFPL ( http://www.wtfpl.net/txt/copying/ )
*/
class ImportsManager {
/**
* Create an `ImportsManager` instance for (re)loading classes and config
* @param {String} basePath executing directory name; default __dirname
*/
constructor(basePath) {
/**
* Stored reference to the base directory path
* @type {String}
*/
this.basePath = basePath;
/**
* Data holder for imported modules
* @type {Object}
*/
this.imports = {};
}
/**
* Pull base path that all imports are required in from
* @public
* @type {String} readonly
*/
get base() {
return this.basePath;
}
/**
* Gather all js files from target directory, then verify and load
* @param {String} dirName The name of the dir to load, relative to the basePath
* @private
* @return {String} Load errors or empty if none
*/
loadDir(dirName) {
const dir = resolve(this.basePath, dirName);
let errorText = '';
try {
RecursiveRead.fileSync(dir).forEach((file) => {
const basename = _basename(file);
if (basename.startsWith('_') || !basename.endsWith('.js')) return;
let imported;
try {
imported = require(file);
if (!this.imports[dirName]) {
this.imports[dirName] = {};
}
this.imports[dirName][file] = imported;
} catch (e) {
const err = `Unable to load modules from ${dirName} (${relative(dir, file)})\n${e}`;
errorText += err;
console.error(err);
}
});
} catch (e) {
const 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
* @public
* @return {String} Load errors or empty if none
*/
reloadDirCache() {
let errorText = '';
Object.keys(this.imports).forEach((dir) => {
Object.keys(this.imports[dir]).forEach((mod) => {
delete require.cache[require.resolve(mod)];
});
errorText += this.loadDir(dir);
});
return errorText;
}
/**
* 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.
* @public
* @return {Object} Object containing command module paths and structs
*/
getImport(dirName) {
const imported = this.imports[dirName];
if (!imported) {
this.loadDir(dirName);
}
return { ...this.imports[dirName] };
}
}
export default ImportsManager;
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