rsure 0.9.4

Rsure captures hashes and metadata about a tree of files, and can later verify these hashes and metadata to determine if the files have changed. It supports incremental updates, and includes an standalone executable for scanning and checking trees.
Documentation 
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//! Augment an iterator over nodes with something that tracks the full
//! path of the files involved.
//!
//! Unfortunately, Rust's Iter does not tie any lifetimes between the
//! iterator and the result of iteration (which is usually good).  This
//! makes it difficult to avoid computing these paths, however.
//!
//! If this becomes a performance bottleneck, we can come up with something
//! more complicated that avoids computing (and allocating) the result
//! paths for each node encountered.

use crate::{escape::Unescape, node::SureNode, Result};
use std::{
    ffi::OsString,
    os::unix::ffi::OsStringExt,
    path::{Path, PathBuf},
};

pub fn into_tracker<I>(iter: I, root: &str) -> impl Iterator<Item = Result<PathedNode>>
where
    I: Iterator<Item = Result<SureNode>>,
{
    let root: OsString = OsStringExt::from_vec(root.unescape().unwrap());
    let mut cur = Path::new(&root).to_path_buf();
    let mut at_root = true;
    iter.map(move |node| {
        let node = node?;
        let path = match &node {
            SureNode::Enter { name, .. } => {
                // Don't add the pseudo "__root__" directory.
                if at_root {
                    if name != "__root__" {
                        panic!("Root directory not at root");
                    }
                    at_root = false;
                } else {
                    let name: OsString = OsStringExt::from_vec(name.unescape().unwrap());
                    cur.push(&name);
                }
                Some(cur.clone())
            }
            SureNode::File { name, .. } => {
                let name: OsString = OsStringExt::from_vec(name.unescape().unwrap());
                cur.push(&name);
                Some(cur.clone())
            }
            _ => None,
        };

        let do_pop = node.is_file() || node.is_leave();

        let result = Ok(PathedNode { node, path });

        if do_pop {
            cur.pop();
        }

        result
    })
}

#[derive(Debug)]
pub struct PathedNode {
    pub node: SureNode,
    pub path: Option<PathBuf>,
}

/*
pub trait PathTrack: Sized {
    fn into_tracker(self, root: &str) -> PathTracker<Self>;
}

impl<I: Iterator<Item = Result<SureNode>>> PathTrack for I {
    fn into_tracker(self, root: &str) -> PathTracker<I> {
        PathTracker {
            iter: self,
            root: Some(root.to_owned()),
            dirs: vec![],
        }
    }
}

pub struct PathTracker<I> {
    iter: I,
    root: Option<String>,
    dirs: Vec<String>,
}

#[derive(Debug)]
pub struct PathedNode {
    pub node: SureNode,
    pub path: Option<String>,
}

impl<I> Iterator for PathTracker<I>
    where I: Iterator<Item = Result<SureNode>>,
{
    type Item = Result<PathedNode>;

    fn next(&mut self) -> Option<Result<PathedNode>> {
        match self.iter.next() {
            None => None,
            Some(Err(e)) => Some(Err(e)),
            Some(Ok(node)) => {
                let path = match &node {
                    SureNode::Enter { name, .. } => {
                        // Don't add the pseudo "__root__ flag.
                        if self.dirs.is_empty() && name == "__root__" {
                            let root = self.root.take().unwrap();
                            self.dirs.push(root);
                        } else {
                            self.dirs.push(name.clone());
                        }
                        Some(self.dirs.join("/"))
                    }
                    SureNode::File { name, .. } => {
                        self.dirs.push(name.clone());
                        Some(self.dirs.join("/"))
                    }
                    _ => None,
                };

                let do_pop = node.is_file() || node.is_leave();

                let result = Some(Ok(PathedNode {
                    node: node,
                    path: path,
                }));

                if do_pop {
                    self.dirs.pop();
                }

                result
            }
        }
    }
}
*/