mddd_std/
env_vars.rs

1use std::collections::HashMap;
2use std::env;
3use std::mem;
4
5pub struct EnvVars {
6    #[allow(dead_code)]
7    storage: Vec<(String, String)>,
8    vars: HashMap<&'static str, &'static str>,
9}
10
11impl EnvVars {
12    pub fn build() -> Self {
13        let storage = env::vars()
14            .filter(|(_, value)| !value.trim().is_empty())
15            .map(|(key, value)| (key.to_uppercase(), value))
16            .collect::<Vec<_>>();
17        let vars = unsafe { Self::build_vars(&storage) };
18        Self { storage, vars }
19    }
20
21    #[inline(always)]
22    pub fn get_var(&self, name: &str) -> Option<&str> {
23        let val = self.vars.get(&name)?;
24        Some(*val)
25    }
26
27    unsafe fn build_vars(raw: &[(String, String)]) -> HashMap<&'static str, &'static str> {
28        raw.iter()
29            .map(|(key, val)| {
30                let key_ref: &str = key;
31                let key_ptr: &'static str = mem::transmute(key_ref);
32                let val_ref: &str = val;
33                let val_ptr: &'static str = mem::transmute(val_ref);
34                (key_ptr, val_ptr)
35            })
36            .collect()
37    }
38}
mddd_std/env_vars.rs

mddd_std/
env_vars.rs
