dynasty 1.4.1

Dynasty Reader's CLI downloader
Documentation 
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use console::truncate_str;
use lazy_regex::regex_captures;

/// Returns the `ch$$` part of a Dynasty Reader's chapter title.
///
/// # Examples
///
/// ```
/// # use dynasty::utils::get_dynasty_chapter_identifier;
/// assert_eq!(
///     get_dynasty_chapter_identifier("Liar Satsuki Can See Death ch48.5"),
///     Some("ch48.5")
/// );
/// assert_eq!(
///     get_dynasty_chapter_identifier("Slow Start ch89: Slow Start x Ama Soba"),
///     Some("ch89")
/// );
/// assert_eq!(
///     get_dynasty_chapter_identifier("Kiss Distance"),
///     None
/// );
/// ```
pub fn get_dynasty_chapter_identifier(s: &str) -> Option<&str> {
    if let Some((chapter_match, ..)) = regex_captures!(r"(ch[\d.]+)", s) {
        Some(chapter_match)
    } else {
        None
    }
}

pub fn truncate_dynasty_chapter_title(s: &str, width: usize) -> String {
    let identifier = get_dynasty_chapter_identifier(s);
    let tail = if let Some(identifier) = identifier {
        format!(".. {}", identifier)
    } else {
        "...".to_string()
    };

    truncate_str(s, width, &tail).to_string()
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn should_get_dynasty_chapter_identifier() {
        let predicates = [
            (
                "The Skirt Sings at the Landing ch13: A night voyage",
                "ch13",
            ),
            ("Liar Satsuki Can See Death ch48.5", "ch48.5"),
            ("Slow Start ch123", "ch123"),
        ];

        for (left, right) in predicates {
            assert_eq!(get_dynasty_chapter_identifier(left), Some(right))
        }
    }

    #[test]
    fn should_not_get_dynasty_chapter_identifier() {
        let predicates = ["Kiss Distance", "A Love Yet to Bloom"];

        for predicate in predicates {
            assert_eq!(get_dynasty_chapter_identifier(predicate), None)
        }
    }
}