gdsl 0.2.1

GDSL is a graph data-structure library including graph containers, connected node strutures and efficient algorithms on those structures. Nodes are independent of a graph container and can be used as connected smart pointers.
Documentation 
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// use gdsl::digraph::*;
use gdsl::*;
use std::cell::Cell;

fn attr(field: &str, value: &str) -> (String, String) {
    (field.to_string(), value.to_string())
}

pub const THEME: [&str; 5] = [
    "#ffffff", // 0. background
    "#ffe5a9", // 1. medium
    "#423f3b", // 2. dark
    "#ff6666", // 3. accent
    "#525266", // 4. theme
];

fn main() {
    let g = digraph![
        (usize, Cell<bool>) => [f64]
        (0, Cell::new(false)) => [(1, 0.1), (2, 0.4), (3, 0.8)]
        (1, Cell::new(false)) => [(3, 0.16), (4, 0.32)]
        (2, Cell::new(false)) => [(4, 0.64)]
        (3, Cell::new(false)) => [(2, 0.12), (0, 0.24)]
        (4, Cell::new(false)) => []
    ];

    g[0].bfs()
        .target(&4)
        .search_path()
        .unwrap()
        .iter_nodes()
        .for_each(|n| n.set(true));

    let dot_str = g.to_dot_with_attr(
        &|graph| {
            let graph_size_mb = graph.sizeof() as f64 / 1024.0 / 1024.0;
            Some(vec![
                attr("bgcolor", THEME[0]),
                attr("fontcolor", THEME[4]),
                attr("label", &format!("Shortest Path {:.4} Mb", graph_size_mb)),
            ])
        },
        &|node| {
            let color = if node.get() { THEME[3] } else { THEME[4] };
            Some(vec![
                attr("color", color),
                attr("fontcolor", THEME[4]),
                attr("label", &format!("{}", node.key())),
            ])
        },
        &|u, v, edge| {
            let color = if u.get() && v.get() {
                THEME[3]
            } else {
                THEME[4]
            };
            Some(vec![
                attr("fontcolor", THEME[4]),
                attr("weight", &edge.to_string()),
                attr("color", color),
            ])
        },
    );

    println!("{}", dot_str);
}