enve/itconfig/README.md

# itconfig

Easy build a configs from environment variables and use it in globally.

We recommend you start with the [documentation].


## Example usage

```rust
#[macro_use] extern crate itconfig;
use std::env;
//use dotenv::dotenv;

config! {
    DEBUG: bool => false,
    
    #[env_name = "APP_HOST"]
    HOST: String => "127.0.0.1",
    
    DATABASE_URL < (
        "postgres://",
        POSTGRES_USERNAME => "user",
        ":",
        POSTGRES_PASSWORD => "pass",
        "@",
        POSTGRES_HOST => "localhost:5432",
        "/",
        POSTGRES_DB => "test",
    ),
    
    APP {
        ARTICLE {
            PER_PAGE: u32 => 15,
        }
        
        #[cfg(feature = "companies")]
        COMPANY {
            #[env_name = "INSTITUTIONS_PER_PAGE"]
            PER_PAGE: u32 => 15,
        }
    }
    
    FEATURE {
        NEW_MENU: bool => false,
    
        COMPANY {
            PROFILE: bool => false,
        }
    }
}

fn main () {
    // dotenv().ok();
    env::set_var("FEATURE_NEW_MENU", "t");
    
    cfg::init();
    assert_eq!(cfg::HOST(), String::from("127.0.0.1"));
    assert_eq!(cfg::DATABASE_URL(), String::from("postgres://user:pass@localhost:5432/test"));
    assert_eq!(cfg::APP:ARTICLE:PER_PAGE(), 15);
    assert_eq!(cfg::FEATURE::NEW_MENU(), true);
}
```


Macro is an optional feature, enabled by default. You can install itconfig without default
features and use this lib as shown below

```rust
use itconfig::*;
use std::env;
// use dotenv::dotenv;

fn main() {
    env::set_var("DATABASE_URL", "postgres://127.0.0.1:5432/test");

    let database_url = get_env::<String>("DATABASE_URL").unwrap();
    let new_profile: bool = get_env_or_default("FEATURE_NEW_PROFILE", false);
    let articles_per_page: u32 = get_env_or_set_default("ARTICLES_PER_PAGE", 10);
}
```


## Roadmap

* [x] Add namespace for variables
* [x] Custom env name
* [x] Support feature config and other meta directives
* [x] Add default value to env if env is not found
* [x] Concat env variables to one variable
* [x] Add nested namespaces
* [x] Support meta for namespaces
* [x] Support array type
* [ ] Support hashmap type
* [ ] Support custom env type
* [ ] Common configuration for namespace variables


## Available features

* default = ["macro", "primitives"]
* macro = []
* array = ["serde_json"]
* primitives = ["numbers", "bool"]
* numbers = ["int", "uint", "float"]
* int = ["i8", "i16", "i32", "i64", "i128", "isize"]
* uint = ["u8", "u16", "u32", "u64", "u128", "usize"]
* float = ["f32", "f64"]
* i8    = []
* i16   = []
* i32   = []
* i64   = []
* i128  = []
* isize = []
* u8    = []
* u16   = []
* u32   = []
* u64   = []
* u128  = []
* usize = []
* f32   = []
* f64   = []
* bool  = []


## License

[MIT] © [Ice Temple](https://github.com/icetemple)


## Contributors

[pleshevskiy](https://github.com/pleshevskiy) (Dmitriy Pleshevskiy) – creator, maintainer.



[documentation]: https://docs.rs/itconfig