display_tree

Simple, automatic, and customizable tree pretty-printing in Rust.

This crate provides tools to easily pretty-print data as a tree, including a trait that represents the ability to be printed as a tree, and a derive macro to automatically implement it for your types

See the crate-level documentation to get started.

Examples

```rust use display_tree::{AsTree, CharSet, DisplayTree, StyleBuilder};

// A tree representing a numerical expression.

[derive(DisplayTree)]

enum Expr { Int(i32), BinOp { #[nodelabel] op: char, #[tree] left: Box, #[tree] right: Box, }, UnaryOp { #[nodelabel] op: char, #[tree] arg: Box, }, }

let expr: Expr = Expr::BinOp { op: '+', left: Box::new(Expr::UnaryOp { op: '-', arg: Box::new(Expr::Int(2)), }), right: Box::new(Expr::Int(7)), };

asserteq!( format!( "{}", AsTree::new(&expr) .indentation(1) .charset(CharSet::DOUBLE_LINE) ), concat!( "+\n", "╠═ -\n", "║ ╚═ Int\n", "║ ╚═ 2\n", "╚═ Int\n", " ╚═ 7", ), ); ```