use std::fs;
use std::path::Path;

/// Refresh the shell's $PATH
///
/// This function caches all valid paths within within the directories
/// specified.
///
/// # Arguments
/// * `paths` - A reference to a vector that holds a list to the shell $PATHs
///
/// # Returns
/// * `bins: Vec<String>` - A new cache of all valid file paths in $PATH
///
/// # Examples
/// ```
/// let path = vec!["/bin"];
/// let path = path.into_iter().map(Path::new).collect();
/// let mut bins = prefresh(&path);
/// let mut bins = path::refresh(&path);
/// ...
/// // A situation occurs where the $PATH needs to be refreshed
/// bins = prefresh(&path)
/// bins = path::refresh(&path)
/// ```
pub fn prefresh(path: &Vec<&Path>) -> Vec<String> {
pub fn refresh(path: &Vec<&Path>) -> Vec<String> {
    let mut bins: Vec<String> = Vec::new();

    for p in path {
        let files = fs::read_dir(p).expect(
            format!(
                "dwvsh: error: unable to read the contents of {}",
                p.display().to_string()
            )
            .as_str(),
        );

        for file in files {
            bins.push(file.unwrap().path().display().to_string());
        }
    }

    bins
}