matt-daniel-brown / generator-app-gen

Customizable code generator based on Yeoman Generator

app-gen

Customizable code generator based on Yeoman Generator.

Usage

First install de Yeoman:

npm install -g yo

Install generator-app-gen:

npm install -g generator-app-gen

Go into your project directory:

cd my-project

Create a file app-gen.[json|js] (see above for more details):

vi app-gen.json

Run yo app-gen to start code generation.

Configuration (app-gen.[json|js])

The app-gen.[json|js] file contains information about code generation for your project. In this file going to describe the configurations for artifacts code generation. This file can be a json or a JavaScript module.

The artifact code generation is performed by 3 configurations: from, in and to.

The configuration from is the template source. The configuration in is the input source. The configuration to is the destination.

Below are the available drivers for each configuration.

From

• FILE
• JSON

In

• JSON
• JSONFILE
• PROMPT
• MYSQL
• POSTGRESQL
• JS

To

• FILE
• CONSOLE

Configuration Structure

In this example, the artifact "Sample1" is getting a template from a file, reading the inputs from JSON and will write resultant text on console and in a file.

{
    "name": "Project Name",
    "helper" : {
    	"filter": "/helpers/filter.js"
  	},
    "artifacts": {
        "Sample1": {
            "from": {
                "driver": "FILE",
                "template": ["./templates/sample-from.js"]
            },
            "in": {
                "driver": "JSON",
                "config": {
                    "message": "Hello World!"
                }
            },
            "to": [{
                "driver": "CONSOLE"
            }, {
                "driver": "FILE",
                "out" : "./out/sample-out.js"
            }]
        },
        "Sample2": { ... },
        ...
        "SampleN": { ... }
    }
}

From

File

Read a template from file.

...
"from": {
    "driver": "FILE",
    "template": ["/tmeplate/path/goes/here.tmpl"]
}
...

JSON

Read a template from file.

...
"from": {
    "driver": "JSON",
    "template": ['template string <%=value%>']
}
...

In

JSON

Read the static supplied JSON config for template bindings.

...
"in": { # required
    "driver": "JSON",
    "config": {
        "message": "Hello World!"
    }
}
...

JSONFILE

Similar to JSON, but reads the JSON of supplied files.

...
"in": { # required
    "driver": "JSONFILE",
    "config": ["file name.json"]
}
...

PROMPT

Request configuration with prompt api (see inquirer)

...
"in": {
    "driver": "PROMPT",
    "config": [{
        "message": "Supply the message",
        "name" : "message"
    }]
}
...

MYSQL

Request configuration from database.

...
"in": {
    "driver": "MYSQL",
    "config": {
        "host": "localhost",
        "port" : "3306",
        "user" : "root",
        "password": "root",
        "query": "SELECT NULL"
    }
}
...

POSTGRESQL

Request configuration from database.

...
"in": {
    "driver": "POSTGRESQL",
    "config": {
        "host": "localhost",
        "port" : 5432,
        "database": "postgres"
        "user" : "user",
        "password": "password",
        "query": "SELECT NULL"
    }
}
...

JS

Read the values from a execution of JavaScript file.

...
"in": { 
    "driver": "JS",
    "config": { "filename" : "javascrip_file_name.js" }
}
...

JavaScript Sample:

module.exports = function(
    generator,  // Instance of Yo Generator
    inValues,   // Previous IN values
    callback    // Callback function
    ) {
    
    // Your code goes here
    var newValues = {
        newValue: "newValue"
    };

    console.log('>>', Object.assign({}, inValues, newValues));
    
    callback(null, Object.assign({}, inValues, newValues));
}

To

FILE

Writes the rendered template at supplied output file.

{
    "driver": "FILE",
    "out": ["path to destination file"],

    // Optional - Replace ocurrences in file.
    "replace" : {
        "regex": "JS RegExp",
        "flags": "JS RegExp flags."
    }
}

CONSOLE

Writes the rendered template at console output.

{
    "driver": "CONSOLE"
}

Examples

Prints a string at console from a JSON template where the input is supplied by user.

app-gen.json

{
    "name": "Examples",
    "artifacts": {
        "Example1": {
            "from": {
                "driver": "JSON",
                "template": ["Hello <%=message%>"]
            },

            "in": {
                "driver": "PROMPT",
                "config": [{
                    "message": "Supply the message:",
                    "name": "message"
                }]
            },

            "to": {
                "driver": "CONSOLE"
            }
        }
    }
}

Run app-gen and select the artifact "Example1". Will be prompted a message. If you supply "world", the output will be like this:

? Choose the artifact Example1
? Supply the message: world

------------- OUT -------------
Hello world
------------- END -------------