Rubberstamp

Seamlessly generate template files with dynamic data.

What is Rubberstamp?

Rubberstamp provides a simple way to copy template directories while modifying file names and contents.

Features

• Simple, intuitive API
• Template-based case modification of variables

Installation

npm i rubberstamp

Usage

First, create template files in your source directory. For example:

src/
├─ index.js
├─ templates/
│  ├─ __name__.js.template
│  ├─ package.json.template

// templates/__name__.js.template

export const __name__ = () => {
	return console.log('Hello! My name is __name__');
};

// templates/package.json.template

{
	"name": "component-__name__",
	"main": "__name__.js"
}

Then, use the stamp() function to clone the templated directory and populate the files with the provided variables.

// index.js
import { stamp } from '@mattiebear/rubberstamp';

const name = 'hello';

const source = './templates';
const destination = `./packages`;

const inject = { name };

const copyTemplate = async () => {
	await stamp(source, destination, { inject });
};

copyTemplate();

This will create modifed fields in the specified directory. In this case, everything in the templates directory and its child directories will be transferred and modified to a newly created packages directory.

// packages/hello.js

export const hello = () => {
	return console.log('Hola! My name is hello');
};

// packages/package.json

{
	"name": "component-hello",
	"main": "hello.js"
}

Super simple!

stamp() Configuration

stamp() accepts a single configuration object.

Variable Injection

You can alter the names of files and directories as well as the contents when injection tokens are included in either. To modify the name of a file or directory, include the format __name__ in the filename, that is the key of the variable bookended by double underscores. Rubberstamp will replace instances of __name__ with the { name: 'value' } entry in the injection object.

File Names

Note that you do not need to append .template to the end of file names but it is recommended so IDEs do not treat the files as syntactically invalid. Any .template suffix will be automatically removed from file names but are not required.

Case Transformations

When a file is populated with variable data it's often necessary to change the case of the passed string variables. One way to do this is to declare multiple variables and pass them in the inject option:

const inject = {
	name: 'hello world',
	nameCapital: 'Hello World',
	namePascal: 'HelloWorld',
	nameCamel: 'helloWorld',
};

This can be especially tedious with a large number of variables. Instead, Rubberstamp allows for case modifications within injection tokens. Simply include $ and the case modifier after the token name.

// templates/__name$K__.tsx.template

import { React } from 'react';

export const __name$P__ = () => { // convert to PascalCase
	return <div>I am __name$C__<div> // convert to Capital Case
}

Assuming the provided injections { name: 'my component' } the file would be modified to the following:

// packages/my-component.tsx

import { React } from 'react';

export const MyComponent = () => {
	return <div>I am My Component<div>
}

Valid case modifiers are

Note that both lower and upper case tokens are value, i.e. __name$m__ and __name$M__ are identical.

Ignoring Files and Directories

The ignorePattern config options allows you to pass in a list of strings or regular expressions that can be use to ignore a file or directory from cloning. If the resource is a directory any subdirectories or files within it will not be copied.

await stamp(source, destination, {
	ignorePattern: ['node_moodules', new RegExp('ignore')],
});

Handling Asset Files

By default a selection of files (ex images and audio) are expempt from the standard process of opening and re-writing the file contents to ensure file operability; the file extension is checked against a simple regex list. You can modify the check with the copyPattern config option. These files will be copied with the copyFile directive rather than writeFile. The default list can be accessed via the copyPattern import.

import { copyPattern } from '@mattiebear/rubberstamp';

await stamp(source, destination, {
	copyPattern: [...copyPattern, '.template', '.ogg'],
});