powerpack_env

Function var_os

Source 
pub fn var_os<K: AsRef<OsStr>>(key: K) -> Option<OsString>
Expand description

Fetches the environment variable key from the current process.

This function is similar to std::env::var_os(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 set to an empty string.

Note that the method will not check if the environment variable is valid Unicode. If you want to return None on invalid UTF-8, use the var function instead.