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markdown-frontmatter

A type-safe parser for Markdown frontmatter.

This crate provides a simple and efficient way to split and parse frontmatter from Markdown documents.

Supported Frontmatter Formats

The crate supports the following frontmatter formats and their corresponding delimiters:

JSON: Delimited by { on the first line and } on a closing line. The enclosed JSON content must be indented to be parsed correctly.
```
{
  "title": "JSON Frontmatter"
}
```
TOML: Delimited by +++ on opening and closing lines.
```
+++
title = "TOML Frontmatter"
+++
```
YAML: Delimited by --- on opening and closing lines.
```
---
title: YAML Frontmatter
---
```

Usage

Add the crate to your dependencies:

cargo add markdown-frontmatter

Parsing Frontmatter

#[derive(serde::Deserialize)]
struct Frontmatter {
    title: String,
}

let doc = r#"---
title: Hello
---
World"#;

let (frontmatter, body) = markdown_frontmatter::parse::<Frontmatter>(doc).unwrap();
assert_eq!(frontmatter.title, "Hello");
assert_eq!(body, "World");

Optional frontmatter

If a document does not contain a frontmatter, it is treated as if it has an empty one. This allows to make frontmatter fully optional by using only optional fields, e.g.

#[derive(serde::Deserialize)]
struct Frontmatter {
    title: Option<String>,
}

let doc = "Hello";
let (frontmatter, body) = markdown_frontmatter::parse::<Frontmatter>(doc).unwrap();
assert!(frontmatter.title.is_none());
assert_eq!(body, "Hello");

Features

This crate has the following Cargo features:

json: Enables JSON frontmatter parsing.
toml: Enables TOML frontmatter parsing.
yaml: Enables YAML frontmatter parsing.

By default, no features are enabled.

Contributing

Before submitting a pull request, please run the .pre-commit.sh script:

./.pre-commit.sh

License

This project is licensed under the MIT license.

markdown-frontmatter 0.5.0