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use pulldown_cmark::{html, Parser};
/// Data container for a single article
pub struct Article {
/// Raw markdown of article
pub markdown: String,
/// Short name of the article, appropriate for generating hyperlinks
///
/// ### Example:
/// `1-my-first-post`
pub slug: String,
/// Title of the article, appropriate for display
///
/// ### Example:
/// `My First Post`
pub title: String,
}
impl Article {
/// Constructor for `Article`
///
/// Note that this will attempt to write the `title` field of the `Article` using
/// `Article::get_title`, defaulting to an empty string if none is found.
///
/// # Example
/// ```
/// let markdown = String::from("# My first post\nHello world!");
/// let slug = "1-my-first-post"
/// let article = Article::new(markdown, slug);
/// ```
pub fn new(markdown: String, slug: String) -> Article {
match Article::get_title(&markdown) {
Some(title) => Article {
markdown: markdown.clone(),
slug,
title: title.to_owned(),
},
None => Article {
markdown,
slug,
title: String::from(""),
},
}
}
/// Render the main template to html
///
/// # Example
/// ```
/// let html = article.render("styles.css", "<p>copyright 2019</p>");
/// ```
pub fn render(&self, css: &str, footer: &str) -> String {
let article = &self.as_html();
let title = &self.title;
format!(
r#"
<!doctype html>
<html>
<head>
<title>{}</title>
<link rel="stylesheet" href="/{}">
<meta charset="utf-8">
<meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1">
</head>
<body>
<main>
<div class="article">
{}
{}
</div>
</main>
</body>
</html>
"#,
title, css, article, footer
)
}
/// Render a footer, with navigation controls based on position in list of articles
pub fn render_footer(index: usize, articles: &[Article], email: Option<&str>) -> String {
let (prev, next) = Article::get_slugs(index, articles);
let links = Article::render_article_links(articles);
let prev_str = match prev {
Some(val) => format!("<a href=\"/articles/{}.html\">←</a>", val),
None => String::from("<span class=\"disabled\">←</span>"),
};
let next_str = match next {
Some(val) => format!("<a href=\"/articles/{}.html\">→</a>", val),
None => String::from("<span class=\"disabled\">→</span>"),
};
let email_str = match email {
Some(e) => format!(
r#"
<div class="contact">
<a id="contact" href="mailto:{}">✉</a>
</div>
"#,
e
),
None => String::from(""),
};
format!(
r#"
<footer>
<div class="nav">
<a href="/">↑</a>
</div>
<div class="nav">
{}
<span class="article-list">
{}
</span>
{}
</div>
{}
</footer>
"#,
prev_str, links, next_str, email_str
)
}
/// Parse title from markdown
///
/// Returns text of first top-level heading (like `# My first post`), or `None`
pub fn get_title(markdown: &str) -> Option<&str> {
let pattern = "# ";
let lines: Vec<&str> = markdown.split('\n').collect();
for line in lines {
if line.starts_with(&pattern) {
let (_, title) = &line.split_at(pattern.len());
return Some(title.trim());
}
}
None
}
fn as_html(&self) -> String {
let parser = Parser::new(&self.markdown);
let mut html_buf = String::new();
html::push_html(&mut html_buf, parser);
html_buf
}
fn get_slugs(i: usize, articles: &[Article]) -> (Option<&str>, Option<&str>) {
let first = 0;
let last = articles.len() - 1;
let prev_slug: Option<&str> = if i > first {
Some(&articles[i - 1].slug)
} else {
None
};
let next_slug: Option<&str> = if i < last {
Some(&articles[i + 1].slug)
} else {
None
};
(prev_slug, next_slug)
}
fn render_article_links(articles: &[Article]) -> String {
articles
.iter()
.rev()
.map(|article| {
let title = &article.title;
let slug = &article.slug;
format!(r#"<a href="/articles/{}.html">{}</a>"#, slug, title).to_owned()
})
.collect::<Vec<String>>()
.join("\n")
}
}