envir

A toolbox to deal with your environment.

Basics

Without feature, this crate provide simple functions to retreive the value of an environment variable:

• get to retreive as string;
• parse to directly parse the value as a desired type.

The try_ version of theire functions return None if the variable doens’t exist when get and parse return an Error::Missing error.

In addition this crate provide a set function, like std::env::set_var but works for all types implement ToString.

Finally, a collect function to retreive all environment variables in a easy to print collection.

dotenv

The dotenv feature adds an eponyme function to load .env file.

serde

The serde feature adds macro to deserialize struct from env:

```

[derive(envir::Deserialize)]

struct Config { }

let config = envir::fromenv()?; // or let config = Config::fromenv()?; ```

And serialize to env:

```

[derive(envir::Serialize, Default)]

struct Config { }

let config = Config::default(); config.export(); ```

The extrapolation feature allows environment variables replacement in the default macro attribute:

```

[derive(envir::Deserialize)]

struct Config { #[envir(defaut = "/home/${USER}")] home: String, } ```

You can read the envir_derive crate documentation for more informations.