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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/ )
*
*/
const read = require('readdir-recursive');
const path = require('path');
class ImportsManager {
/**
* Create a `ImportsManager` instance for (re)loading classes and config
*
* @param {String} basePath executing directory name; default __dirname
*/
constructor (basePath) {
this.basePath = basePath;
this.imports = {};
}
/**
* Pull base path that all imports are required in from
*
* @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.
*
* @return {String} Load errors or empty if none
*/
loadDir (dirName) {
const dir = path.resolve(this.basePath, 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 (!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 {Array} dirName The name of the dir to load, relative to the _base path.
*
* @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.
*
* @return {Object} Object containing command module paths and structs
*/
getImport (dirName) {
let imported = this.imports[dirName];
if (!imported) {
this.loadDir(dirName);
}
return Object.assign({}, this.imports[dirName]);
}
}
module.exports = ImportsManager;
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