gGen

A directory structure and file generator.

gGen allows you to easily create template directory structures and template files for your project.

You can generate any kind of files

• Java classes, interfaces...
• Golang files
• React Components
• Redux Reducers
• Redux Sagas
• index.js files based on directory content
• CSS
• HTML
• And many more !

Install

# Local install 
npm i -D ggen

# Global install 
npm i -g ggen
 
# In each project directory 
npm link ggen

Create default configuration:

# From your project directory 
ggen init

Usage

After you've edited your configuration:

ggen <command> [opts]

<command> and [opts] depend on your config files, see below.

Examples

Look in the .ggen directory of this project to have more complete examples.

Configuration

By default, ggen looks for its configuration in .ggen/ in the current working directory. You can override this path with the GGEN_PATH environnement variable.

.ggen structure:

.ggen
├── templates/  -- Handlebars template files for file generation
└── config.js   -- Main configuration file

File generation uses Handlebars templates located at <GGEN_PATH>/templates.

Simple example

Let's say you want to automate the process of creating a nodejs module, using the following structure:

<module name>/
└── index.js

Where index.js exports a single function.

Template and config files

• .ggen/templates/index.js.hbs

  module.exports = function {{ module_name }}() {
   
  }

• .ggen/config.js

  const type = require('ggen')
   
  module.exports = {
    // adds the "module" command to the ggen cli
    module: {
      params: {
        // adds the --module_name option the ggen cli
        // adds a "module_name" variable to the template's context
        module_name: type.String() // function to parse the command line input
      },
      // will create a directory named after the "module_name" cli option,
      // containing an index.js file based on the index.js.hbs template
      tree: {
        "{{module_name}}": {
          "index.js": "index.js.hbs"
        }
      }
    }
  }

Generating an example module

To generate the example module, simply call:

ggen module --module_name example

It will create the following structure in your current working directory:

example/
└── index.js

example/index.js:

module.exports = function example() {
 
}

Parameter types

NOTICE If you have installed ggen globally, you will need to link it to your project to use included type parsers. npm link ggen

Start your config file with:

const type = require('ggen')
// type.String()
// type.Array()
// type.Map()
// ...

type.String(), type.Number(), type.Boolean()

Parses the input into either a String, Number, or Boolean types

type.Array(separator = ",")

Parses the input into an array of strings.

// config.js
const example = {
  tree: {
    // directory structure
  }
  params: {
    list: type.Array()
  }
}

# generation command 
ggen example --list apple,banana,orange

// Resulting template context
{
  "list": [ "apple", "banana", "orange" ]
}

type.Map(entrySeparator = ",", keyValueSeparator ":")

Parses the input into an object.

// config.js
const example = {
  tree: {
    // directory structure
  }
  params: {
    properties: type.Map()
  }
}

# genaration command 
ggen example --properties email:null,isOk:true

// Resulting template context
{
  "properties": {
    "email": "null",
    "isOk": "true"
  }
}