helix/helix-view/src/env.rs

pub fn binary_exists(binary_name: &str) -> bool {
    which::which(binary_name).is_ok()
}

#[cfg(not(windows))]
pub fn env_var_is_set(env_var_name: &str) -> bool {
    std::env::var_os(env_var_name).is_some()
}
Use OSC 52 as a fallback for setting the system clipboard (#3220) This adds a simple base64 implementation to keep us from adding a crate for one function. It's mostly based on https://github.com/marshallpierce/rust-base64/blob/a675443d327e175f735a37f574de803d6a332591/src/engine/naive.rs#L42 2 years ago			`pub fn binary_exists(binary_name: &str) -> bool {`
			`which::which(binary_name).is_ok()`
			`}`

			`#[cfg(not(windows))]`
			`pub fn env_var_is_set(env_var_name: &str) -> bool {`
			`std::env::var_os(env_var_name).is_some()`
			`}`