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rcook/var_opt.rs

Last active May 9, 2023 17:03
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Optionally get environment variable
Raw
var_opt.rs
fn var_opt<K>(key: K) -> Result<Option<String>>
where
K: AsRef<OsStr>,
{
use std::env::{var, VarError};
match var(key) {
Ok(value) => Ok(Some(value)),
Err(VarError::NotPresent) => Ok(None),
_ => bail!("environment variable not found"),
}
}
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