feat(git): export GitErrorCode from repo

So that we can call e.g. `Repo::create_branch` and ignore the error if the branch already exists.

Author: arxanas

git-branchless-lib/src/git/mod.rs

@@ -23,8 +23,8 @@ pub use reference::{
 };
 pub use repo::{
     message_prettify, AmendFastOptions, CherryPickFastOptions, CreateCommitFastError,
-    Error as RepoError, GitVersion, PatchId, Repo, ResolvedReferenceInfo, Result as RepoResult,
-    Time,
+    Error as RepoError, GitErrorCode, GitVersion, PatchId, Repo, ResolvedReferenceInfo,
+    Result as RepoResult, Time,
 };
 pub use run::{GitRunInfo, GitRunOpts, GitRunResult};
 pub use snapshot::{WorkingCopyChangesType, WorkingCopySnapshot};

git-branchless-lib/src/git/repo.rs

@@ -277,6 +277,8 @@ pub enum Error {
 /// Result type.
 pub type Result<T> = std::result::Result<T, Error>;
 
+pub use git2::ErrorCode as GitErrorCode;
+
 /// Convert a `git2::Error` into an `eyre::Error` with an auto-generated message.
 pub(super) fn wrap_git_error(error: git2::Error) -> eyre::Error {
     eyre::eyre!("Git error {:?}: {}", error.code(), error.message())