if let Some(p) = &source_dir {
        assert!(p.is_absolute());
    }


    // Traverse source dir and store all paths, reversed.
    let mut file_to_paths: FxHashMap<String, Vec<PathBuf>> = FxHashMap::default();
    if let Some(ref source_dir) = source_dir {
        for entry in WalkDir::new(&source_dir)
            .into_iter()
            .filter_entry(|e| !is_hidden(e) && !is_symbolic_link(e))
        {
            let entry = entry
                .unwrap_or_else(|_| panic!("Failed to open directory '{}'.", source_dir.display()));


            let full_path = entry.path();
            if !full_path.is_file() {
                continue;
            }


            let path = full_path.strip_prefix(&source_dir).unwrap().to_path_buf();
            if to_ignore_globset.is_match(&path) {
                continue;
            }


            let name = entry.file_name().to_str().unwrap().to_string();
            match file_to_paths.entry(name) {
                hash_map::Entry::Occupied(f) => f.into_mut().push(path),
                hash_map::Entry::Vacant(v) => {
                    v.insert(vec![path]);
                }
            };
        }
    }

            println!("checking full_path: {:?}", full_path);
            let path = full_path.strip_prefix(&source_dir).unwrap().to_path_buf();
            println!("checking  stripped: {:?}", path);
            if to_ignore_globset.is_match(&path) {
                println!("ignoring     path: {:?}", path);
                continue;
            }

checking full_path: "/home/wink/prgs/rust/myrepos/workspace-template-with-xtask/xtask/Cargo.lock"
checking  stripped: "xtask/Cargo.lock"
ignoring     path: "xtask/Cargo.lock"
checking full_path: "/home/wink/prgs/rust/myrepos/workspace-template-with-xtask/xtask/Cargo.toml"
checking  stripped: "xtask/Cargo.toml"
ignoring     path: "xtask/Cargo.toml"
checking full_path: "/home/wink/prgs/rust/myrepos/workspace-template-with-xtask/xtask/src/main.rs"
checking  stripped: "xtask/src/main.rs"
ignoring     path: "xtask/src/main.rs"

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name = "clap"
version = "3.2.25"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "4ea181bf566f71cb9a5d17a59e1871af638180a18fb0035c92ae62b705207123"
dependencies = [
 "atty",
 "bitflags 1.3.2",
 "clap_lex 0.2.4",
 "indexmap 1.9.3",
 "strsim",
 "termcolor",
 "textwrap",
]