env-var

Macros providing easier access to environment variables in rust.

License

env-var is dual-licensed under Apache License, Version 2.0 and MIT license.

Usage

Put this in your Cargo.toml:

text [dependencies] env-var = "1" log = "0.4"

Examples

```rust

[macro_use]

extern crate env_var;

fn main() { // retrieving a optional value // var1 either contains the value or an empty string let var1 = envvar!(optional "TESTOPT_1");

// retrieving a optional value with default // var1 either contains the value or "default1" let var1 = envvar!(optional "TESTOPT_1", default: "default1");

// retrieving a optional value with default // if not found, the message will be logged as info message // var1 either contains the value or "default1" let var1 = envvar!(optional "TESTOPT_1", default: "default1", msg: "using default");

// retrieving a required value // var1 either contains the value or the programm panics let var1 = envvar!(required "TESTOPT_1");

// retrieving a required value with default // var1 either contains the value or "default1" let var1 = envvar!(required "TESTOPT_1", default: "default1");

// retrieving a required value with default // if not found, the message will be logged as warn message // var1 either contains the value or "default1" let var1 = envvar!(required "TESTOPT_1", default: "default1", msg: "using default");

} ```