Cargo.lock

# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3

[[package]]
name = "anyhow"
version = "1.0.41"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "15af2628f6890fe2609a3b91bef4c83450512802e59489f9c1cb1fa5df064a61"

[[package]]
name = "ttf-parser"
version = "0.12.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7ae2f58a822f08abdaf668897e96a5656fe72f5a9ce66422423e8849384872e6"

[[package]]
name = "ttfp"
version = "0.1.0"
dependencies = [
 "anyhow",
 "ttf-parser",
]

Cargo.toml

[package]
name = "ttfp"
version = "0.1.0"
edition = "2018"

[dependencies]
ttf-parser = "^0.12.3"
anyhow = "^1.0.41"

main.rs

use anyhow::Error;
use std::env::args_os;
use std::fs::read;
use ttf_parser::{Face, GlyphId, OutlineBuilder};

#[derive(Debug)]
struct Path(Vec<String>);

impl Path {
	fn new() -> Self {
		Path(vec![])
	}

	fn to_string(&self) -> String {
		self.0.join(" ")
	}
}

impl OutlineBuilder for Path {
	fn move_to(&mut self, x: f32, y: f32) {
		self.0.push(format!("M {} {}", x, y));
	}

	fn line_to(&mut self, x: f32, y: f32) {
		self.0.push(format!("L {} {}", x, y));
	}

	fn quad_to(&mut self, x1: f32, y1: f32, x: f32, y: f32) {
		self.0.push(format!("Q {} {} {} {}", x1, y1, x, y));
	}

	fn curve_to(&mut self, x1: f32, y1: f32, x2: f32, y2: f32, x: f32, y: f32) {
		self.0
			.push(format!("C {} {} {} {} {} {}", x1, y1, x2, y2, x, y));
	}

	fn close(&mut self) {
		let str = self.0.join(" ");
		self.0.clear();
		self.0.push(str);
	}
}

fn main() -> anyhow::Result<()> {
	let path = args_os()
		.skip(1)
		.last()
		.ok_or(Error::msg("Usage: sex [FILE]"))?;

	let file = read(path)?;
	let face = Face::from_slice(file.as_slice(), 0)?;

	for index in 0..face.number_of_glyphs() {
		let id = GlyphId(index);
		let mut path = Path::new();

		if let Some(rect) = face.outline_glyph(id, &mut path) {
			let fallback = format!("@{}", index);
			let name = face.glyph_name(id).unwrap_or(&fallback);
			let viewbox = format!(
				"{} {} {} {}",
				rect.x_min,
				rect.y_min,
				rect.width(),
				rect.height()
			);

			println!(
				"<svg id={:?} viewBox={:?}><path d={:?} /></svg>",
				name,
				viewbox,
				path.to_string()
			);
		}
	}

	Ok(())
}