clap_conf 0.1.6

A library to unify commandline arguments with config files and environment variables. And make it easier for users to tell your program how to behave across the three main input sources
Documentation 
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use crate::{Filter, Getter};

pub static EV: Enver = Enver {};

#[derive(Debug)]
pub struct Enver {}

impl<'a> Getter<'a> for Enver {
    type Out = String;
    type Iter = std::option::IntoIter<String>;
    fn value<S: AsRef<str>>(&self, s: S, f: Filter) -> Option<String> {
        if f == Filter::Env {
            return std::env::var(s.as_ref()).ok();
        }
        None
    }
    fn values<S: AsRef<str>>(&self, s: S, f: Filter) -> Option<Self::Iter> {
        if f == Filter::Env {
            return Some(std::env::var(s.as_ref()).ok().into_iter());
        }
        None
    }
}