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import hbs, { ExpressHandlebars } from "express-handlebars";
import { RenderViewOptions } from "express-handlebars/types/index.js";
export class HandlebarsSingleton {
static #instance: HandlebarsSingleton;
hbsInstance: hbs.ExpressHandlebars;
private constructor() {
this.hbsInstance = hbs.create({
defaultLayout: "main",
partialsDir: ["views/partials/"],
layoutsDir: "views/layouts/",
helpers: {
plural: function (number: number, text: string) {
const singular = number === 1;
// If no text parameter was given, just return a conditional s.
if (typeof text !== "string") return singular ? "" : "s";
// Split with regex into group1/group2 or group1(group3)
const match = text.match(/^([^()\/]+)(?:\/(.+))?(?:\((\w+)\))?/);
// If no match, just append a conditional s.
if (!match) return text + (singular ? "" : "s");
// We have a good match, so fire away
return (
(singular && match[1]) || // Singular case
match[2] || // Plural case: 'bagel/bagels' --> bagels
match[1] + (match[3] || "s")
); // Plural case: 'bagel(s)' or 'bagel' --> bagels
},
json: function (context: object) {
return JSON.stringify(context);
},
},
});
}
public static get instance(): HandlebarsSingleton {
if (!HandlebarsSingleton.#instance) {
HandlebarsSingleton.#instance = new HandlebarsSingleton();
}
return HandlebarsSingleton.#instance;
}
public get engine(): ExpressHandlebars["engine"] {
return this.hbsInstance.engine;
}
/**
* Finally, any singleton can define some business logic, which can be
* executed on its instance.
*/
public renderView(viewPath: string, options: RenderViewOptions): Promise<string> {
return this.hbsInstance.renderView(viewPath, options);
}
}
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