vle 1.19.3

Very Little Editor - an exercise in minimalist text editing
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// Copyright 2026 Brian Langenberger
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use crate::highlighter;
use crate::syntax::{Highlight, Modifier};
use logos::Logos;
use ratatui::style::Color;

#[derive(Logos, Debug)]
// #[logos(skip r"[ \t\n]+")]
enum PatchToken {
    #[regex("(Index:|diff|index)[[:blank:]].*", allow_greedy = true)]
    Header,
    #[regex("\\+.*", allow_greedy = true)]
    Added,
    #[regex(" .*", allow_greedy = true)]
    Context,
    #[regex("\\-.*", allow_greedy = true)]
    Deleted,
    #[regex("@@.*", allow_greedy = true)]
    Linenumber,
}

impl TryFrom<PatchToken> for Highlight {
    type Error = ();

    fn try_from(t: PatchToken) -> Result<Highlight, ()> {
        match t {
            PatchToken::Header => Ok(Highlight {
                color: None,
                modifier: Modifier::Bold,
            }),
            PatchToken::Added => Ok(Color::LightGreen.into()),
            PatchToken::Context => Err(()),
            PatchToken::Deleted => Ok(Color::LightRed.into()),
            PatchToken::Linenumber => Ok(Color::Cyan.into()),
        }
    }
}

#[derive(Debug)]
pub struct Patch;

impl std::fmt::Display for Patch {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        "Patch".fmt(f)
    }
}

highlighter!(
    Patch,
    PatchToken,
    Some(|s| { Box::new(s.starts_with("diff ").then_some(0..s.len()).into_iter()) })
);