playing with git2

mod test {
    use anyhow::{Context, Ok, Result};
    use git2::Repository;
    use std::path::PathBuf;

    #[test]
    fn opening_a_repo() -> Result<()> {
        let file = PathBuf::from("crates/async_cb/src/lib.rs");
        let repo = Repository::discover("/home/bfalk/Projects/journal/crates/")?;
        let head = repo.revparse("HEAD")?;
        let id = head.from().unwrap().id();
        let commit = repo.find_commit(id)?;
        let tree = commit.tree()?;
        let entry = tree.get_path(&file)?;
        let blob = entry.to_object(&repo)?.into_blob().unwrap();
        let content = String::from_utf8(blob.content().to_owned())?;
        println!("{content}");
        Ok(())
    }
}

This snippet opens the repository for this journal, fetches the "HEAD" revision. From this you can get the id of the commit, which is the sha of that particular commit. Once you have a commit it becomes a drill-down to a particular file, which is what I'm interested in. Because the files can be anything it appears, if I want to get the contents as a string the "blob" it needs to be converted.

I've been trying to learn how to use the git2-rs bindings for my anchors aweigh project. It has been extremely slow going as the documentation is extremely sparse and hard to follow. The biggest breakthroughs I've made so far is these:

examples have been the best source so far
a lot of online resources are very out of date
Repository::discover is handy for opening a repo