dirx 0.1.0

Creates an in-memory index of all the files in a directory tree, and allows efficient scanning of only those files that have been modified since the index got created
Documentation 
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use crate::index::DirIndex;
use crate::scan::Scanner;
use std::fs::File;
use std::fs::Metadata;
use std::io;
use std::path::Path;
use std::path::PathBuf;

#[derive(Clone, Debug)]
pub struct ScanOptions {
    pub(super) one_file_system: bool,
    pub(super) add_prefix: Option<PathBuf>,
}

impl ScanOptions {
    #[inline]
    pub fn new() -> Self {
        Self {
            one_file_system: false,
            add_prefix: None,
        }
    }

    #[inline]
    pub fn one_file_system(&mut self, one_file_system: bool) -> &mut Self {
        self.one_file_system = one_file_system;
        self
    }

    #[inline]
    pub fn add_prefix(&mut self, prefix: PathBuf) -> &mut Self {
        self.add_prefix = Some(prefix);
        self
    }

    #[inline]
    pub fn scan_with<'i, T, P, F>(
        &self,
        index: &'i mut DirIndex<T>,
        path: P,
        generator: F,
    ) -> io::Result<Scanner<'i, T, F>>
    where
        P: AsRef<Path>,
        F: FnMut(&Path, &mut File, &Metadata) -> io::Result<T>,
    {
        Scanner::new(self.clone(), index, path, generator)
    }

    #[inline]
    pub fn scan<'i, T, P>(
        &self,
        index: &'i mut DirIndex<T>,
        path: P,
    ) -> io::Result<Scanner<'i, T, impl FnMut(&Path, &mut File, &Metadata) -> io::Result<T>>>
    where
        T: Default,
        P: AsRef<Path>,
    {
        self.scan_with(index, path, |_, _, _| Ok(T::default()))
    }
}

impl Default for ScanOptions {
    #[inline]
    fn default() -> Self {
        Self::new()
    }
}