track-core 0.1.0

Shared backend primitives and repositories for the track issue tracker.
Documentation 
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use crate::time_utils::format_task_id_timestamp;

pub const TASK_SLUG_MAX_LENGTH: usize = 60;

pub fn build_task_slug(description: &str) -> String {
    let slug = slug::slugify(description);
    let trimmed = slug.chars().take(TASK_SLUG_MAX_LENGTH).collect::<String>();

    if trimmed.is_empty() {
        "task".to_owned()
    } else {
        trimmed
    }
}

pub fn build_unique_task_id<F>(
    timestamp: time::OffsetDateTime,
    description: &str,
    mut exists: F,
) -> String
where
    F: FnMut(&str) -> bool,
{
    let base_id = format!(
        "{}-{}",
        format_task_id_timestamp(timestamp),
        build_task_slug(description)
    );

    if !exists(&base_id) {
        return base_id;
    }

    let mut suffix = 2;
    loop {
        let candidate = format!("{base_id}-{suffix}");
        if !exists(&candidate) {
            return candidate;
        }

        suffix += 1;
    }
}

#[cfg(test)]
mod tests {
    use time::macros::datetime;

    use super::{build_task_slug, build_unique_task_id};

    #[test]
    fn slug_falls_back_when_description_has_no_letters() {
        assert_eq!(build_task_slug("!!!"), "task");
    }

    #[test]
    fn unique_id_appends_suffix_when_needed() {
        let id = build_unique_task_id(
            datetime!(2026-03-16 09:08:07 UTC),
            "Fix issue",
            |candidate| candidate == "20260316-090807-fix-issue",
        );

        assert_eq!(id, "20260316-090807-fix-issue-2");
    }
}