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#[cfg(test)]
#[path = "./generic_tests.rs"]
mod generic_tests;
use crate::errors::EnvmntError;
use crate::types::EnvmntResult;
use std::env::var;
use std::env::VarError;
use std::ffi::OsStr;
use std::fmt::Display;
use std::str::FromStr;
pub(crate) fn get_parse<K, T, E>(key: K) -> EnvmntResult<T>
where
K: AsRef<OsStr>,
T: FromStr + FromStr<Err = E>,
E: Display,
{
match var(&key) {
Ok(valstr) => valstr.parse::<T>().map_err(|error| {
EnvmntError::InvalidType(format!(
"Environment variable {} is of incompatible type {}. Failed to parse with: {}",
key.as_ref().to_string_lossy(),
stringify!(T),
error
))
}),
Err(VarError::NotPresent) => Err(EnvmntError::Missing(format!(
"Environment variable '{}' is not set",
key.as_ref().to_string_lossy()
))),
Err(VarError::NotUnicode(osstr)) => Err(EnvmntError::InvalidType(format!(
"Environment variable is not valid unicode: {:#?}",
osstr
))),
}
}
pub(crate) fn get_parse_or<K, T, E>(key: K, default: T) -> EnvmntResult<T>
where
K: AsRef<OsStr>,
T: FromStr + FromStr<Err = E>,
E: Display,
{
let result = get_parse(key);
if let Err(EnvmntError::Missing(_)) = result {
Ok(default)
} else {
result
}
}