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# Lono

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Lono is a CloudFormation framework. It builds, manages, and deploys CloudFormation templates.

## Lono Features

* Simple CLI interface to launch CloudFormation stacks.
* Ability to use [Existing CloudFormation Templates](https://lono.cloud/docs/existing-templates/).
* [The Lono DSL](https://lono.cloud/docs/dsl/) - Generate templates from beautiful code.
* Write your CloudFormation parameters with [simple env-like values](https://lono.cloud/docs/config/params/).
* Preview CloudFormation changes before pressing the big red button.
* [Layering](https://lono.cloud/docs/core/layering/) - Allows you to build multiple environments like development and production with the same template.
* [Variables](https://lono.cloud/docs/layering/variables/) - Allows you to construct templates where runtime Parameters do not suffice.
* [Helpers](https://lono.cloud/docs/core/helpers/) - Allows you to extend Lono and simplify code.
* [Configsets](https://lono.cloud/docs/configsets/) - Configurement Management. Automatically configure EC2 instances with reuseable code.

See [lono.cloud](http://lono.cloud) for full lono documentation.

## Quick Usage

It only takes a couple of commands to start using lono.

    gem install lono --prerelease
    lono new project infra --examples
    cd infra
    lono up demo

![Lono flowchart](https://lono.cloud/img/tutorial/lono-flowchart.png "Lono flowchart")

## DSL

Here's an example of what the Lono CloudFormation DSL looks like:

```ruby
description "Demo stack"

parameter("InstanceType", "t3.micro")

mapping("AmiMap",
  "us-east-1": { Ami: "ami-0de53d8956e8dcf80" },
  "us-west-2": { Ami: "ami-061392db613a6357b" }
)

resource("Instance", "AWS::EC2::Instance",
  InstanceType: ref("InstanceType"),
  ImageId: find_in_map("AmiMap", ref("AWS::Region"), "Ami"),
  SecurityGroupIds: [get_att("SecurityGroup.GroupId")],
  UserData: base64(user_data("bootstrap.sh"))
)
resource("SecurityGroup", "AWS::EC2::SecurityGroup",
  GroupDescription: "demo security group",
)

output("Instance")
output("SecurityGroup", get_att("SecurityGroup.GroupId"))
```

### Lono Up

The `lono up` command deploys the CloudFormation stack.

    $ lono up demo

## Contributing

1. Fork it
2. Create your feature branch (`git checkout -b my-new-feature`)
3. Commit your changes (`git commit -am 'Add some feature'`)
4. Push to the branch (`git push origin my-new-feature`)
5. Create new Pull Request