rev_parse/
rev_parse.rs

1//! Resolve a revision string such as `HEAD` or a full hex object id with [`rev_parse::resolve_revision`].
2//!
3//! Run: `cargo run -p grit-lib --example rev_parse`
4
5use grit_lib::objects::{serialize_commit, CommitData, ObjectKind};
6use grit_lib::refs;
7use grit_lib::repo::init_repository;
8use grit_lib::rev_parse::resolve_revision;
9use grit_lib::write_tree::write_tree_from_index;
10
11fn main() -> grit_lib::error::Result<()> {
12    let root = tempfile::tempdir()?;
13    let repo = init_repository(root.path(), false, "main", None, "files")?;
14
15    use grit_lib::index::{Index, IndexEntry, MODE_REGULAR};
16    let blob_oid = repo.odb.write(ObjectKind::Blob, b"x\n")?;
17    let path = b"a".to_vec();
18    let entry = IndexEntry {
19        ctime_sec: 0,
20        ctime_nsec: 0,
21        mtime_sec: 0,
22        mtime_nsec: 0,
23        dev: 0,
24        ino: 0,
25        mode: MODE_REGULAR,
26        uid: 0,
27        gid: 0,
28        size: 0,
29        oid: blob_oid,
30        flags: 1,
31        flags_extended: None,
32        path,
33        base_index_pos: 0,
34    };
35    let mut index = Index::new();
36    index.add_or_replace(entry);
37    repo.write_index(&mut index)?;
38    let index = repo.load_index()?;
39    let tree_oid = write_tree_from_index(&repo.odb, &index, "")?;
40    let commit = CommitData {
41        tree: tree_oid,
42        parents: Vec::new(),
43        author: "Example <example@example.com> 1700000000 +0000".to_owned(),
44        committer: "Example <example@example.com> 1700000000 +0000".to_owned(),
45        author_raw: Vec::new(),
46        committer_raw: Vec::new(),
47        encoding: None,
48        message: "r\n".to_owned(),
49        raw_message: None,
50    };
51    let oid = repo
52        .odb
53        .write(ObjectKind::Commit, &serialize_commit(&commit))?;
54    refs::write_ref(&repo.git_dir, "refs/heads/main", &oid)?;
55
56    let head = resolve_revision(&repo, "HEAD")?;
57    let full = resolve_revision(&repo, &oid.to_hex())?;
58    println!("HEAD resolves to {head}");
59    println!("full hex resolves to {full}");
60    assert_eq!(head, full);
61
62    Ok(())
63}
rev_parse/rev_parse.rs

rev_parse/
rev_parse.rs
