use git_repository as git;

use crate::commit::Message;

/// A head reference will all commits that are 'governed' by it, that is are in its exclusive ancestry.
pub struct Segment<'a> {
    pub head: git::refs::Reference,
    /// only relevant history items, that is those that change code in the respective crate.
    pub history: Vec<&'a Item>,
}

pub struct Item {
    pub id: git::ObjectId,
    pub message: Message,
    pub commit_time: git::actor::Time,
    pub tree_id: git::ObjectId,
    pub parent_tree_id: Option<git::ObjectId>,
}

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

    #[test]
    fn size_of_item() {
        assert_eq!(
            std::mem::size_of::<Item>(),
            200,
            "there are plenty of these loaded at a time and we should not let it grow unnoticed."
        )
    }
}