wolf-graph-dot 0.1.0

Adds support for generating Graphviz DOT files from wolf-graph graphs.
Documentation 
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use std::fmt;

use crate::{Color, NodeShape, NodeStyle};

#[derive(Debug, Clone, PartialEq)]
pub struct NodeAttributes {
    pub label: Option<String>,
    pub color: Option<Color>,
    pub style: Option<NodeStyle>,
    pub shape: Option<NodeShape>,
}

impl NodeAttributes {
    pub fn new(
        label: Option<String>,
        color: Option<Color>,
        style: Option<NodeStyle>,
        shape: Option<NodeShape>,
    ) -> Self {
        Self { label, color, style, shape }
    }

    pub fn attributes(&self) -> Option<String> {
        crate::details::encode::encode_attributes(&[
            ("label", self.label.as_ref().map(|s| s as &dyn ToString)),
            ("color", self.color.as_ref().map(|c| c as &dyn ToString)),
            ("style", self.style.as_ref().map(|s| s as &dyn ToString)),
            ("shape", self.shape.as_ref().map(|s| s as &dyn ToString)),
        ], true)
    }
}

impl Default for NodeAttributes {
    fn default() -> Self {
        Self::new(None, None, None, None)
    }
}

impl fmt::Display for NodeAttributes {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        if let Some(encoded) = self.attributes() {
            write!(f, "{}", encoded)
        } else {
            Ok(())
        }
    }
}