/*
 * Copyright (C) the libgit2 contributors. All rights reserved.
 *
 * This file is part of libgit2, distributed under the GNU GPL v2 with
 * a Linking Exception. For full terms see the included COPYING file.
 */
#ifndef INCLUDE_git_revparse_h__
#define INCLUDE_git_revparse_h__

#include "common.h"
#include "types.h"


/**
 * @file git2/revparse.h
 * @brief Git revision parsing routines
 * @defgroup git_revparse Git revision parsing routines
 * @ingroup Git
 * @{
 */
GIT_BEGIN_DECL


/**
 * Revparse flags.  These indicate the intended behavior of the spec passed to
 * git_revparse.
 */
typedef enum {
	/** The spec targeted a single object. */
	GIT_REVPARSE_SINGLE         = 1 << 0,
	/** The spec targeted a range of commits. */
	GIT_REVPARSE_RANGE          = 1 << 1,
	/** The spec used the '...' operator, which invokes special semantics. */
	GIT_REVPARSE_MERGE_BASE     = 1 << 2,
} git_revparse_flag_t;


/**
 * Parse a revision string for left, right, and intent. See `man gitrevisions` or
 * http://git-scm.com/docs/git-rev-parse.html#_specifying_revisions for information
 * on the syntax accepted.
 *
 * @param left buffer that receives the target of the left side of a range operator. If
 *             there is no range operator, this buffer receives the single target.
 * @param right buffer that receives the target of the right side of a range operator.
 *              This is only filled in if `spec` specifies a range of commits. May
 *              be NULL.
 * @param flags buffer that receives a bitwise combination of `git_revparse_flag_t` values.
 *              May be NULL.
 * @param repo the repository to search in
 * @param spec the rev-parse spec to parse
 * @return 0 on success, GIT_INVALIDSPEC, GIT_ENOTFOUND, GIT_EAMBIGUOUS or an error code
 */
GIT_EXTERN(int) git_revparse(
		git_oid *left,
		git_oid *right,
		unsigned int *flags,
		git_repository *repo,
		const char *spec);


/** @} */
GIT_END_DECL
#endif