1 files changed, 91 insertions, 0 deletions
diff --git a/src/git.h b/src/git.h
new file mode 100644
index 0000000..c0ae4e3
--- /dev/null
+++ b/src/git.h
@@ -0,0 +1,91 @@
+#ifndef GITFS_GIT_H
+#define GITFS_GIT_H
+
+#include <memory>
+#include <git2.h>
+#include <ostream>
+
+namespace GitFS {
+	namespace Git {
+		struct Error {
+			int err;
+			int klass;
+			const char * message;
+		};
+		void throwError(int err);
+
+		template<typename ... P, typename ... A>
+		void
+		gitSafe(int (*func)(P...), A ... p)
+		{
+			if (int _giterror = func(p...); _giterror != 0) {
+				throwError(_giterror);
+			}
+		}
+
+		template<typename T>
+		using TPtr = std::shared_ptr<T>;
+
+		template<typename R, typename ... P, typename ... A>
+		auto
+		gitSafeGet(int(*get)(R**, P...), void(*release)(R*), A ... p)
+		{
+			R * r = nullptr;
+			gitSafe(get, &r, p...);
+			return TPtr<R>(r, release);
+		}
+
+		template<typename R, typename ... P, typename ... A>
+		auto
+		gitSafeGet(int(*get)(R**, P...), A ... p)
+		{
+			R * r = nullptr;
+			gitSafe(get, &r, p...);
+			return r;
+		}
+
+		inline auto OidParse(const std::string_view & str)
+		{
+			git_oid oid;
+			gitSafe(git_oid_fromstrn, &oid, str.data(), str.length());
+			return oid;
+		}
+
+		inline auto RepositoryOpenBare(const std::string & path)
+		{
+			return gitSafeGet(git_repository_open_bare, git_repository_free, path.c_str());
+		}
+		using RepositoryPtr = decltype(RepositoryOpenBare(""));
+
+		inline auto BlobLookup(const RepositoryPtr & repo, const git_oid & blob)
+		{
+			return gitSafeGet(git_blob_lookup, git_blob_free, repo.get(), &blob);
+		}
+		using BlobPtr = decltype(BlobLookup({}, {}));
+
+		inline auto CommitLookup(const RepositoryPtr & repo, const git_oid & commitId)
+		{
+			return gitSafeGet(git_commit_lookup, git_commit_free, repo.get(), &commitId);
+		}
+		using CommitPtr = decltype(CommitLookup({}, {}));
+
+		inline auto TreeLookup(const RepositoryPtr & repo, const git_oid & treeId)
+		{
+			return gitSafeGet(git_tree_lookup, git_tree_free, repo.get(), &treeId);
+		}
+		using TreePtr = decltype(TreeLookup({}, {}));
+
+		inline auto TreeEntryByPath(const TreePtr & tree, const std::string & path)
+		{
+			return gitSafeGet(git_tree_entry_bypath, git_tree_entry_free, tree.get(), path.c_str() + 1);
+		}
+		using TreeEntryPtr = decltype(TreeEntryByPath({}, {}));
+	}
+}
+
+namespace std {
+	std::ostream & operator<<(std::ostream &, const git_oid &);
+}
+
+#endif
+