poopgen 💩

Simple and flexible project generator.

With poopgen, your project generation logic lives inside of your template.

Why is it named poopgen?

Project generators emit files and I thought poopgen was a fitting name :)

Table Of Contents

• Install
• Usage
• A Basic Example
• More examples

Install

npm i poopgen
# or
yarn add poopgen
# or
pnpm add poopgen

Usage

import { poopgen } from "poopgen";

await poopgen({
	// tell poopgen where your template lives
	template: "./template",
	// tell poopgen where to build your project to
	dest: "./dest",
});

A Basic Example

This should be all you need to learn how to use poopgen. It's that easy to use!

A poopgen template is a folder that contains three things:

• Files
• Other folders
• poopfiles

For the following example, we will assume that this is the file tree for our generator:

src/
├─ cli.ts
template/
├─ _poop.js
├─ index.ts.ejs
├─ README.md

src/cli.ts

import { poopgen } from "poopgen";

await poopgen({
	// tell poopgen where your template lives
	template: "./template",
	// tell poopgen where to build your project to
	dest: "./dest",
});

template/_poop.js

This is what poopgen recognizes as a poopfile. A poopfile is any simple JavaScript module named _poop.js that exports functions named before and after. (You can export before, after, or both!)

This allows you to embed logic and hook into the poopgen lifecycle directly within your template!

Poopfiles can live in any directory inside of your template.

The before function is executed before poopgen generates the directory The after function is executed after poopgen generates the directory

It just makes sense, right?

Here are some of the things you could use them for:

• ask the user for input
• Install dependencies or create a git repository after the project has been generated
• skipping a directory if a condition is not met
  • maybe a user doesn't want to opt in to a certain feature

/** @type{import("poopgen").BeforeFn}  */
export async function before(ctx) {
	// the 'before' function is called before the current directory is generated
	console.log("before generating!");

	// IMPORTANT
	// ctx.data is the data used for rendering ejs templates
	ctx.data.name = "poopgen";

	// you could use this to collect information from the user to be used in your templates!
}

/** @type{import("poopgen").AfterFn}  */
export function after(ctx) {
	// the 'after' function is called after the current directory is generated

	console.log("done generating!");
}

template/index.ts.ejs

/* 
poopgen uses ejs to render templates. If a file ends with .ejs, poopgen knows it is a template and will strip the extension off after generating it. 

Note: If a file does not end with .ejs, it is copied to the destination without any templating

Remember how we defined ctx.data.name in this directory's poopfile? ('_poop.js'). This file, 'index.ts.ejs', requires name to be defined on the ctx.data object.
*/

console.log("Hello world from <%- name %>!");

template/README.md

# Example

This file does not end in '.ejs', it will be copied to '/dest/README.md'!

Extra

getCtx

Poopgen exports a function named getCtx that allows you to access the current context inside of a poopfile.

// so this...
import { getCtx } from "poopgen";

export function before() {
	const ctx = getCtx();

	ctx.data.message = "poopgen is awesome!";
}

// does the same as
export function before(ctx) {
	ctx.data.message = "poopgen is awesome!";
}

Context is useful if you want to create helper functions, but don't necessarily want to have to pass the context to all of them.

import { getCtx } from "poopgen";

export function before() {
	printTemplateData();
}

export function after() {
	printDestPath();
}

// logs the inside of ctx.data (ctx.data is used to render the ejs templates)
function printTemplateData() {
	const ctx = getCtx();

	console.log("rendering template files with", ctx.data);
}

// logs the destination of the generation
function printDestinationPath() {
	const ctx = getCtx();

	console.log("project was generated to", ctx.dir.path);
}

Built with poopgen

ts-lib-gen

A simple generator to create a new typescript library