casaubon/src/rss.rs

use chrono::{DateTime, Utc};
use htmlescape::encode_minimal;

use config::Config;
use entry::{Entry, EntryKind};

pub fn generate_post_rss(config: &Config, post: &Entry) -> String {
    let raw_date = post.date.unwrap().and_hms_opt(0, 0, 0).unwrap();
    let date: DateTime<Utc> = DateTime::from_utc(raw_date, Utc);
    let date_string = date.format("%a, %d %b %Y %H:%M:%S %z").to_string();
    let url = format!("{}/posts/{}/", config.url, post.slug);
    format!(
        "<item><title>{}</title><description>{}</description><guid>{}</guid><link>{}</link><pubDate>{}</pubDate></item>",
        post.title, encode_minimal(&post.render("<article>{{ body }}</article>", config)), url, url, date_string
    )
}

pub fn generate_rss(config: &Config, posts: Vec<Entry>) -> String {
    let items = posts
        .iter()
        .filter(|post| post.kind == EntryKind::Post)
        .map(|post| generate_post_rss(config, post))
        .collect::<Vec<String>>()
        .join("");

    format!(
        "<rss version=\"2.0\" xmlns:atom=\"http://www.w3.org/2005/Atom\"><channel><atom:link href=\"{}/rss.xml\" rel=\"self\" /><title>{}</title><description>{}</description><link>{}</link>{}</channel></rss>",
        config.url, config.site_name, config.description, config.url, items
    )
}

#[cfg(test)]
mod tests {
    use chrono::NaiveDate;

    use super::generate_rss;
    use config::Config;
    use entry::{Entry, EntryKind};

    #[test]
    fn generates_rss_feed() {
        let config = Config {
            site_name: String::from("Lorem Ipsum"),
            url: String::from("https://www.loremipsum.com"),
            description: String::from("recent posts from loremipsum.com"),
        };
        let posts: Vec<Entry> = vec![Entry {
            title: String::from("Hello World"),
            body: String::from("lorem ipsum dolor sit amet"),
            slug: String::from("hello-world"),
            date: Some(NaiveDate::from_ymd(2019, 1, 1)),
            kind: EntryKind::Post,
        }];
        assert_eq!(
            generate_rss(&config, posts),
            "<rss version=\"2.0\" xmlns:atom=\"http://www.w3.org/2005/Atom\"><channel><atom:link href=\"https://www.loremipsum.com/rss.xml\" rel=\"self\" /><title>Lorem Ipsum</title><description>recent posts from loremipsum.com</description><link>https://www.loremipsum.com</link><item><title>Hello World</title><description>&lt;article&gt;&lt;p&gt;lorem ipsum dolor sit amet&lt;/p&gt;\n&lt;/article&gt;</description><guid>https://www.loremipsum.com/posts/hello-world/</guid><link>https://www.loremipsum.com/posts/hello-world/</link><pubDate>Tue, 01 Jan 2019 00:00:00 +0000</pubDate></item></channel></rss>"
        );
    }
}