Function powerpack::env::var

pub fn var<K: AsRef<OsStr>>(key: K) -> Option<String>

Fetches the environment variable key from the current process.

This function is similar to env::var(key).ok() but it also maps an empty string to None.

None

Returns None in the following cases:

• if the environment variable is not present.
• if the environment variable is not valid Unicode.
• if the environment variable is set to an empty string.

Panics

This function may panic if key is empty, contains an ASCII equals sign '=' or the NUL character '\0', or when the value contains the NUL character.