mdtext 0.1.0

An incremental/streaming markdown parser compliant with CommonMark/GFM.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159

// WARNING: the entirety of this file was LLM-generated. BEWARE!

use std::fs::File;
use std::io::{self, Read, Write};
use std::path::Path;

use mdtext::{Event, Options, Parser, Tag};

mod web;

const USAGE: &str = "usage: mdtext [--gfm] [--math] [FILE ...]\n       mdtext --web [--paper]";

fn main() {
    let mut options = Options::empty();
    let mut paths = Vec::new();
    let mut web_mode = false;
    let mut paper_style = false;
    for argument in std::env::args().skip(1) {
        match argument.as_str() {
            "--gfm" => options |= Options::GFM,
            "--math" => options |= Options::MATH,
            "--web" => web_mode = true,
            "--paper" => paper_style = true,
            "-h" | "--help" => {
                eprintln!("{USAGE}");
                return;
            }
            flag if flag.starts_with('-') => {
                eprintln!("unknown option: {flag}");
                eprintln!("{USAGE}");
                std::process::exit(2);
            }
            path => paths.push(path.to_string()),
        }
    }

    if paper_style && !web_mode {
        eprintln!("--paper requires --web");
        eprintln!("{USAGE}");
        std::process::exit(2);
    }

    if web_mode {
        if !paths.is_empty() {
            eprintln!("--web does not accept file paths");
            eprintln!("{USAGE}");
            std::process::exit(2);
        }
        // The interactive preview is intended to match a modern chat
        // renderer, so its useful extensions work without extra flags.
        options |= Options::GFM | Options::MATH | Options::MATH_LATEX;
        if let Err(error) = web::run(options, paper_style) {
            eprintln!("web preview failed: {error}");
            std::process::exit(1);
        }
        return;
    }

    if paths.is_empty() {
        // Demo mode: stdin → event stream.
        let mut input = String::new();
        if let Err(e) = io::stdin().read_to_string(&mut input) {
            eprintln!("error reading stdin: {e}");
            std::process::exit(1);
        }
        for event in Parser::parse_str(&input, options) {
            print_event(&event);
        }
        return;
    }

    for path in &paths {
        if let Err(e) = convert_file(Path::new(path), options) {
            eprintln!("error converting {}: {}", path, e);
            std::process::exit(1);
        }
    }
}

fn convert_file(input: &Path, options: Options) -> io::Result<()> {
    let mut file = File::open(input)?;
    let mut markdown = String::new();
    file.read_to_string(&mut markdown)?;

    let mut writer = mdtext::html::HtmlWriter::with_options(options);
    writer.push_text_raw(
        "<!DOCTYPE html>\n<html>\n<head>\n<meta charset=\"utf-8\">\n</head>\n<body>\n",
    );
    for event in Parser::parse_str(&markdown, options) {
        writer.push_event(&event);
    }
    writer.push_text_raw("</body>\n</html>\n");

    let output = input.with_extension("html");
    let mut out = File::create(&output)?;
    out.write_all(writer.into_string().as_bytes())?;
    eprintln!("wrote {}", output.display());
    Ok(())
}

fn print_event(event: &Event) {
    match event {
        Event::Start(tag) => {
            println!("Start({})", format_tag(tag));
        }
        Event::End => {
            println!("End");
        }
        Event::Text(s) => {
            println!("Text({:?})", s);
        }
        Event::Code(s) => {
            println!("Code({:?})", s);
        }
        Event::SoftBreak => {
            println!("SoftBreak");
        }
        Event::HardBreak => {
            println!("HardBreak");
        }
        Event::ThematicBreak => {
            println!("ThematicBreak");
        }
        Event::Html(s) => {
            println!("Html({:?})", s);
        }
        Event::TaskListMarker(checked) => println!("TaskListMarker({checked})"),
        Event::InlineMath(source) => println!("InlineMath({source:?})"),
        Event::DisplayMath(source) => println!("DisplayMath({source:?})"),
    }
}

fn format_tag(tag: &Tag) -> String {
    match tag {
        Tag::Paragraph => "Paragraph".to_string(),
        Tag::Heading(level) => format!("Heading({})", level),
        Tag::CodeBlock(kind) => format!("CodeBlock({:?})", kind),
        Tag::CodeSpan => "CodeSpan".to_string(),
        Tag::DisplayMath => "DisplayMath".to_string(),
        Tag::HtmlBlock => "HtmlBlock".to_string(),
        Tag::Quote => "BlockQuote".to_string(),
        Tag::List(kind) => format!("List({:?})", kind),
        Tag::Item => "Item".to_string(),
        Tag::Emphasis => "Emphasis".to_string(),
        Tag::Strong => "Strong".to_string(),
        Tag::Strikethrough => "Strikethrough".to_string(),
        Tag::Table(alignments) => format!("Table({alignments:?})"),
        Tag::TableHead => "TableHead".to_string(),
        Tag::TableBody => "TableBody".to_string(),
        Tag::TableRow => "TableRow".to_string(),
        Tag::TableCell => "TableCell".to_string(),
        Tag::Link { url, title } => {
            format!("Link {{ url: {:?}, title: {:?} }}", url, title)
        }
        Tag::Image { url, title } => {
            format!("Image {{ url: {:?}, title: {:?} }}", url, title)
        }
    }
}