envy

# Envy

**Envy** loads and sets environment variables from YAML. It supports all YAML data types, including arrays and hashes.

*Envy* uses the YAML key mapping of a value as the environment variable name. For example, the following YAML configuration...

```yaml
---
app:
  database:
    host: localhost
    port: 4321
  server:
    hosts:
      - localhost
      - grottopress.localhost
    port: 8080
  webhooks:
    - url: "https://example.com"
      token: "a1b2c2"
    - url: "https://myapp.net"
      token: "d4e5f6"
```

...sets environment variables as follows:

```crystal
ENV["APP_DATABASE_HOST"] = "localhost"
ENV["APP_DATABASE_PORT"] = "4321"

ENV["APP_SERVER_HOSTS_0"] = "localhost"
ENV["APP_SERVER_HOSTS_1"] = "grottopress.localhost"
ENV["APP_SERVER_PORT"] = "8080"

ENV["APP_WEBHOOKS_0_URL"] = "https://example.com"
ENV["APP_WEBHOOKS_0_TOKEN"] = "a1b2c2"
ENV["APP_WEBHOOKS_1_URL"] = "https://myapp.net"
ENV["APP_WEBHOOKS_1_TOKEN"] = "d4e5f6"
```

It sets file permission (`0600` by default) for all config files.

*Envy* supports loading a file from a supplied list of files in decreasing order of priority; the first readable file is loaded.

## Installation

1. Add the dependency to your `shard.yml`:

   ```yaml
   dependencies:
     envy:
       github: GrottoPress/envy
   ```

2. Run `shards install`

## Usage

- Load the first readable file from a supplied list of files. Optionally set files permissions. This does *not* overwrite existing environment variables:

    ```crystal
    require "envy"

    Envy.from_file ".env.yml", ".env.dev.yml", perm: 0o400
    ```

 - Load the first readable file from a supplied list of files. Optionally set files permissions. This *overwrites* existing environment variables:

    ```crystal
    require "envy"

    Envy.from_file! ".env.yml", ".env.dev.yml", perm: 0o400
    ```

## Contributing

1. [Fork it](https://github.com/GrottoPress/envy/fork)
1. Switch to the `master` branch: `git checkout master`
1. Create your feature branch: `git checkout -b my-new-feature`
1. Make your changes, updating changelog and documentation as appropriate.
1. Commit your changes: `git commit`
1. Push to the branch: `git push origin my-new-feature`
1. Submit a new *Pull Request* against the `GrottoPress:master` branch.