48 lines
1.4 KiB
Rust
48 lines
1.4 KiB
Rust
use std::env::VarError;
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use std::error;
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use std::ffi::OsString;
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use std::fmt;
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/// The error type for operations interacting with environment variables
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#[derive(Debug, PartialEq)]
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pub enum Error {
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/// The specified environment variable was not present in the current process's environment.
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NotPresent,
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/// Failed to parse the specified environment variable.
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Parse(String),
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/// The specified environment variable was found, but it did not contain
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/// valid unicode data. The found data is returned as a payload of this
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/// variant.
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Invalid(OsString),
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}
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impl fmt::Display for Error {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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use Error::*;
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match &self {
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NotPresent => f.write_str("The specified env variable was not present"),
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Invalid(inner) => write!(
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f,
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"The specified env variable was found, but it did not valid: '{:?}'",
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inner,
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),
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Parse(env_name) => {
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write!(f, r#"Failed to parse environment variable "{}""#, env_name)
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}
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}
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}
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}
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impl error::Error for Error {}
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impl From<VarError> for Error {
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fn from(err: VarError) -> Self {
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match err {
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VarError::NotPresent => Error::NotPresent,
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VarError::NotUnicode(inner) => Error::Invalid(inner),
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}
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}
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}
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