feat(ops): Reword support

Author: epage

src/ops.rs

@@ -197,6 +197,27 @@ pub fn squash(
     Ok(new_id)
 }
 
+/// Reword `head_id`s commit
+pub fn reword(
+    repo: &git2::Repository,
+    head_id: git2::Oid,
+    msg: &str,
+) -> Result<git2::Oid, git2::Error> {
+    let old_commit = repo.find_commit(head_id)?;
+    let parents = old_commit.parents().collect::<Vec<_>>();
+    let parents = parents.iter().collect::<Vec<_>>();
+    let tree = repo.find_tree(old_commit.tree_id())?;
+    let new_id = repo.commit(
+        None,
+        &old_commit.author(),
+        &old_commit.committer(),
+        msg,
+        &tree,
+        &parents,
+    )?;
+    Ok(new_id)
+}
+
 // From git2 crate
 #[cfg(unix)]
 fn bytes2path(b: &[u8]) -> &std::path::Path {

tests/ops.rs

@@ -88,3 +88,28 @@ fn squash_clean() {
 
     temp.close().unwrap();
 }
+
+#[test]
+fn reword() {
+    let temp = assert_fs::TempDir::new().unwrap();
+    let plan = git_fixture::Dag::load(std::path::Path::new("tests/fixtures/branches.yml")).unwrap();
+    plan.run(temp.path()).unwrap();
+
+    let repo = git2::Repository::discover(temp.path()).unwrap();
+
+    {
+        assert!(!git2_ext::ops::is_dirty(&repo));
+
+        let feature2 = repo
+            .find_branch("feature2", git2::BranchType::Local)
+            .unwrap();
+        let feature2_id = feature2.get().target().unwrap();
+
+        let new_id = git2_ext::ops::reword(&repo, feature2_id, "New message").unwrap();
+
+        println!("{:#?}", new_id);
+        assert!(!git2_ext::ops::is_dirty(&repo));
+    }
+
+    temp.close().unwrap();
+}