Function nu_parser::find_in_dirs

pub fn find_in_dirs(
    filename: &str,
    working_set: &StateWorkingSet<'_>,
    cwd: &str,
    dirs_var_name: &str
) -> Option<ParserPath>

This helper function is used to find files during parsing

First, the actual current working directory is selected as a) the directory of a file currently being parsed b) current working directory (PWD)

Then, if the file is not found in the actual cwd, dirs_var is checked. For now, we first check for a const with the name of dirs_var_name, and if that’s not found, then we try to look for an environment variable of the same name. If there is a relative path in dirs_var, it is assumed to be relative to the actual cwd determined in the first step.

Always returns an absolute path