expandenv-rs

A Rust crate for expanding environment variables, inspired by shellexpand.

This might not be very feature complete because I made it for a CLI tool of mine called boxunbox, but I figured someone else might also find some use because shellexpand is now unmaintained.

lib.rs:

This crate is for expanding environment variables and tilde's (~) with support for fallback values.

Examples

#
#
#
#
// expand a variable
let envvar_value = expand("$FOO")?;

// return an error if it fails
assert!(expand("$MISSING_VAR").is_err());

// or expand a fallback on failure
let envvar_value = expand("${MISSING_VAR:-$FOO}")?;

// you can even expand an entire path!
// the `~` expands to your home directory
let path = expand("~/${MISSING_VAR:-$FOO}/file.txt")?;
#