#![doc(html_root_url = "https://docs.rs/libgit2-sys/0.16")]
#![allow(non_camel_case_types, unused_extern_crates)]

// This is required to link libz when libssh2-sys is not included.
extern crate libz_sys as libz;

use libc::{c_char, c_int, c_uchar, c_uint, c_void, size_t};
#[cfg(feature = "ssh")]
use libssh2_sys as libssh2;
use std::ffi::CStr;

pub const GIT_OID_RAWSZ: usize = 20;
pub const GIT_OID_HEXSZ: usize = GIT_OID_RAWSZ * 2;
pub const GIT_CLONE_OPTIONS_VERSION: c_uint = 1;
pub const GIT_STASH_APPLY_OPTIONS_VERSION: c_uint = 1;
pub const GIT_CHECKOUT_OPTIONS_VERSION: c_uint = 1;
pub const GIT_MERGE_OPTIONS_VERSION: c_uint = 1;
pub const GIT_REMOTE_CALLBACKS_VERSION: c_uint = 1;
pub const GIT_STATUS_OPTIONS_VERSION: c_uint = 1;
pub const GIT_BLAME_OPTIONS_VERSION: c_uint = 1;
pub const GIT_PROXY_OPTIONS_VERSION: c_uint = 1;
pub const GIT_SUBMODULE_UPDATE_OPTIONS_VERSION: c_uint = 1;
pub const GIT_ODB_BACKEND_VERSION: c_uint = 1;
pub const GIT_REFDB_BACKEND_VERSION: c_uint = 1;
pub const GIT_CHERRYPICK_OPTIONS_VERSION: c_uint = 1;
pub const GIT_APPLY_OPTIONS_VERSION: c_uint = 1;
pub const GIT_REVERT_OPTIONS_VERSION: c_uint = 1;
pub const GIT_INDEXER_OPTIONS_VERSION: c_uint = 1;

macro_rules! git_enum {
    (pub enum $name:ident { $($variants:tt)* }) => {
        #[cfg(target_env = "msvc")]
        pub type $name = i32;
        #[cfg(not(target_env = "msvc"))]
        pub type $name = u32;
        git_enum!(gen, $name, 0, $($variants)*);
    };
    (pub enum $name:ident: $t:ty { $($variants:tt)* }) => {
        pub type $name = $t;
        git_enum!(gen, $name, 0, $($variants)*);
    };
    (gen, $name:ident, $val:expr, $variant:ident, $($rest:tt)*) => {
        pub const $variant: $name = $val;
        git_enum!(gen, $name, $val+1, $($rest)*);
    };
    (gen, $name:ident, $val:expr, $variant:ident = $e:expr, $($rest:tt)*) => {
        pub const $variant: $name = $e;
        git_enum!(gen, $name, $e+1, $($rest)*);
    };
    (gen, $name:ident, $val:expr, ) => {}
}

pub enum git_blob {}
pub enum git_branch_iterator {}
pub enum git_blame {}
pub enum git_commit {}
pub enum git_config {}
pub enum git_config_iterator {}
pub enum git_index {}
pub enum git_index_conflict_iterator {}
pub enum git_object {}
pub enum git_reference {}
pub enum git_reference_iterator {}
pub enum git_annotated_commit {}
pub enum git_refdb {}
pub enum git_refspec {}
pub enum git_remote {}
pub enum git_repository {}
pub enum git_revwalk {}
pub enum git_submodule {}
pub enum git_tag {}
pub enum git_tree {}
pub enum git_tree_entry {}
pub enum git_treebuilder {}
pub enum git_push {}
pub enum git_note {}
pub enum git_note_iterator {}
pub enum git_status_list {}
pub enum git_pathspec {}
pub enum git_pathspec_match_list {}
pub enum git_diff {}
pub enum git_diff_stats {}
pub enum git_patch {}
pub enum git_rebase {}
pub enum git_reflog {}
pub enum git_reflog_entry {}
pub enum git_describe_result {}
pub enum git_packbuilder {}
pub enum git_odb {}
pub enum git_odb_stream {}
pub enum git_odb_object {}
pub enum git_worktree {}
pub enum git_transaction {}
pub enum git_mailmap {}
pub enum git_indexer {}

#[repr(C)]
pub struct git_revspec {
    pub from: *mut git_object,
    pub to: *mut git_object,
    pub flags: c_uint,
}

#[repr(C)]
pub struct git_error {
    pub message: *mut c_char,
    pub klass: c_int,
}

#[repr(C)]
#[derive(Copy, Clone)]
pub struct git_oid {
    pub id: [u8; GIT_OID_RAWSZ],
}

#[repr(C)]
#[derive(Copy)]
pub struct git_strarray {
    pub strings: *mut *mut c_char,
    pub count: size_t,
}
impl Clone for git_strarray {
    fn clone(&self) -> git_strarray {
        *self
    }
}

#[repr(C)]
#[derive(Copy)]
pub struct git_oidarray {
    pub ids: *mut git_oid,
    pub count: size_t,
}
impl Clone for git_oidarray {
    fn clone(&self) -> git_oidarray {
        *self
    }
}

#[repr(C)]
pub struct git_signature {
    pub name: *mut c_char,
    pub email: *mut c_char,
    pub when: git_time,
}

#[repr(C)]
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub struct git_time {
    pub time: git_time_t,
    pub offset: c_int,
    pub sign: c_char,
}

pub type git_off_t = i64;
pub type git_time_t = i64;
pub type git_object_size_t = u64;

git_enum! {
    pub enum git_revparse_mode_t {
        GIT_REVPARSE_SINGLE = 1 << 0,
        GIT_REVPARSE_RANGE = 1 << 1,
        GIT_REVPARSE_MERGE_BASE = 1 << 2,
    }
}

git_enum! {
    pub enum git_error_code: c_int {
        GIT_OK = 0,

        GIT_ERROR = -1,
        GIT_ENOTFOUND = -3,
        GIT_EEXISTS = -4,
        GIT_EAMBIGUOUS = -5,
        GIT_EBUFS = -6,
        GIT_EUSER = -7,
        GIT_EBAREREPO = -8,
        GIT_EUNBORNBRANCH = -9,
        GIT_EUNMERGED = -10,
        GIT_ENONFASTFORWARD = -11,
        GIT_EINVALIDSPEC = -12,
        GIT_ECONFLICT = -13,
        GIT_ELOCKED = -14,
        GIT_EMODIFIED = -15,
        GIT_EAUTH = -16,
        GIT_ECERTIFICATE = -17,
        GIT_EAPPLIED = -18,
        GIT_EPEEL = -19,
        GIT_EEOF = -20,
        GIT_EINVALID = -21,
        GIT_EUNCOMMITTED = -22,
        GIT_EDIRECTORY = -23,
        GIT_EMERGECONFLICT = -24,
        GIT_PASSTHROUGH = -30,
        GIT_ITEROVER = -31,
        GIT_RETRY = -32,
        GIT_EMISMATCH = -33,
        GIT_EINDEXDIRTY = -34,
        GIT_EAPPLYFAIL = -35,
        GIT_EOWNER = -36,
    }
}

git_enum! {
    pub enum git_error_t {
        GIT_ERROR_NONE = 0,
        GIT_ERROR_NOMEMORY,
        GIT_ERROR_OS,
        GIT_ERROR_INVALID,
        GIT_ERROR_REFERENCE,
        GIT_ERROR_ZLIB,
        GIT_ERROR_REPOSITORY,
        GIT_ERROR_CONFIG,
        GIT_ERROR_REGEX,
        GIT_ERROR_ODB,
        GIT_ERROR_INDEX,
        GIT_ERROR_OBJECT,
        GIT_ERROR_NET,
        GIT_ERROR_TAG,
        GIT_ERROR_TREE,
        GIT_ERROR_INDEXER,
        GIT_ERROR_SSL,
        GIT_ERROR_SUBMODULE,
        GIT_ERROR_THREAD,
        GIT_ERROR_STASH,
        GIT_ERROR_CHECKOUT,
        GIT_ERROR_FETCHHEAD,
        GIT_ERROR_MERGE,
        GIT_ERROR_SSH,
        GIT_ERROR_FILTER,
        GIT_ERROR_REVERT,
        GIT_ERROR_CALLBACK,
        GIT_ERROR_CHERRYPICK,
        GIT_ERROR_DESCRIBE,
        GIT_ERROR_REBASE,
        GIT_ERROR_FILESYSTEM,
        GIT_ERROR_PATCH,
        GIT_ERROR_WORKTREE,
        GIT_ERROR_SHA1,
        GIT_ERROR_HTTP,
    }
}

git_enum! {
    pub enum git_repository_state_t {
        GIT_REPOSITORY_STATE_NONE,
        GIT_REPOSITORY_STATE_MERGE,
        GIT_REPOSITORY_STATE_REVERT,
        GIT_REPOSITORY_STATE_REVERT_SEQUENCE,
        GIT_REPOSITORY_STATE_CHERRYPICK,
        GIT_REPOSITORY_STATE_CHERRYPICK_SEQUENCE,
        GIT_REPOSITORY_STATE_BISECT,
        GIT_REPOSITORY_STATE_REBASE,
        GIT_REPOSITORY_STATE_REBASE_INTERACTIVE,
        GIT_REPOSITORY_STATE_REBASE_MERGE,
        GIT_REPOSITORY_STATE_APPLY_MAILBOX,
        GIT_REPOSITORY_STATE_APPLY_MAILBOX_OR_REBASE,
    }
}

git_enum! {
    pub enum git_direction {
        GIT_DIRECTION_FETCH,
        GIT_DIRECTION_PUSH,
    }
}

#[repr(C)]
pub struct git_clone_options {
    pub version: c_uint,
    pub checkout_opts: git_checkout_options,
    pub fetch_opts: git_fetch_options,
    pub bare: c_int,
    pub local: git_clone_local_t,
    pub checkout_branch: *const c_char,
    pub repository_cb: git_repository_create_cb,
    pub repository_cb_payload: *mut c_void,
    pub remote_cb: git_remote_create_cb,
    pub remote_cb_payload: *mut c_void,
}

git_enum! {
    pub enum git_clone_local_t {
        GIT_CLONE_LOCAL_AUTO,
        GIT_CLONE_LOCAL,
        GIT_CLONE_NO_LOCAL,
        GIT_CLONE_LOCAL_NO_LINKS,
    }
}

#[repr(C)]
pub struct git_checkout_options {
    pub version: c_uint,
    pub checkout_strategy: c_uint,
    pub disable_filters: c_int,
    pub dir_mode: c_uint,
    pub file_mode: c_uint,
    pub file_open_flags: c_int,
    pub notify_flags: c_uint,
    pub notify_cb: git_checkout_notify_cb,
    pub notify_payload: *mut c_void,
    pub progress_cb: git_checkout_progress_cb,
    pub progress_payload: *mut c_void,
    pub paths: git_strarray,
    pub baseline: *mut git_tree,
    pub baseline_index: *mut git_index,
    pub target_directory: *const c_char,
    pub ancestor_label: *const c_char,
    pub our_label: *const c_char,
    pub their_label: *const c_char,
    pub perfdata_cb: git_checkout_perfdata_cb,
    pub perfdata_payload: *mut c_void,
}

pub type git_checkout_notify_cb = Option<
    extern "C" fn(
        git_checkout_notify_t,
        *const c_char,
        *const git_diff_file,
        *const git_diff_file,
        *const git_diff_file,
        *mut c_void,
    ) -> c_int,
>;
pub type git_checkout_progress_cb =
    Option<extern "C" fn(*const c_char, size_t, size_t, *mut c_void)>;

pub type git_checkout_perfdata_cb =
    Option<extern "C" fn(*const git_checkout_perfdata, *mut c_void)>;

#[repr(C)]
pub struct git_checkout_perfdata {
    pub mkdir_calls: size_t,
    pub stat_calls: size_t,
    pub chmod_calls: size_t,
}

#[repr(C)]
#[derive(Copy, Clone, Default)]
pub struct git_indexer_progress {
    pub total_objects: c_uint,
    pub indexed_objects: c_uint,
    pub received_objects: c_uint,
    pub local_objects: c_uint,
    pub total_deltas: c_uint,
    pub indexed_deltas: c_uint,
    pub received_bytes: size_t,
}

pub type git_indexer_progress_cb =
    Option<extern "C" fn(*const git_indexer_progress, *mut c_void) -> c_int>;

#[deprecated(
    since = "0.10.0",
    note = "renamed to `git_indexer_progress` to match upstream"
)]
pub type git_transfer_progress = git_indexer_progress;

#[repr(C)]
pub struct git_indexer_options {
    pub version: c_uint,
    pub progress_cb: git_indexer_progress_cb,
    pub progress_cb_payload: *mut c_void,
    pub verify: c_uchar,
}

pub type git_remote_ready_cb = Option<extern "C" fn(*mut git_remote, c_int, *mut c_void) -> c_int>;

#[repr(C)]
pub struct git_remote_callbacks {
    pub version: c_uint,
    pub sideband_progress: git_transport_message_cb,
    pub completion: Option<extern "C" fn(git_remote_completion_type, *mut c_void) -> c_int>,
    pub credentials: git_cred_acquire_cb,
    pub certificate_check: git_transport_certificate_check_cb,
    pub transfer_progress: git_indexer_progress_cb,
    pub update_tips:
        Option<extern "C" fn(*const c_char, *const git_oid, *const git_oid, *mut c_void) -> c_int>,
    pub pack_progress: git_packbuilder_progress,
    pub push_transfer_progress: git_push_transfer_progress,
    pub push_update_reference: git_push_update_reference_cb,
    pub push_negotiation: git_push_negotiation,
    pub transport: git_transport_cb,
    pub remote_ready: git_remote_ready_cb,
    pub payload: *mut c_void,
    pub resolve_url: git_url_resolve_cb,
}

#[repr(C)]
pub struct git_fetch_options {
    pub version: c_int,
    pub callbacks: git_remote_callbacks,
    pub prune: git_fetch_prune_t,
    pub update_fetchhead: c_int,
    pub download_tags: git_remote_autotag_option_t,
    pub proxy_opts: git_proxy_options,
    pub depth: c_int,
    pub follow_redirects: git_remote_redirect_t,
    pub custom_headers: git_strarray,
}

#[repr(C)]
pub struct git_fetch_negotiation {
    refs: *const *const git_remote_head,
    refs_len: size_t,
    shallow_roots: *mut git_oid,
    shallow_roots_len: size_t,
    depth: c_int,
}

git_enum! {
    pub enum git_remote_autotag_option_t {
        GIT_REMOTE_DOWNLOAD_TAGS_UNSPECIFIED,
        GIT_REMOTE_DOWNLOAD_TAGS_AUTO,
        GIT_REMOTE_DOWNLOAD_TAGS_NONE,
        GIT_REMOTE_DOWNLOAD_TAGS_ALL,
    }
}

git_enum! {
    pub enum git_fetch_prune_t {
        GIT_FETCH_PRUNE_UNSPECIFIED,
        GIT_FETCH_PRUNE,
        GIT_FETCH_NO_PRUNE,
    }
}

git_enum! {
    pub enum git_remote_completion_type {
        GIT_REMOTE_COMPLETION_DOWNLOAD,
        GIT_REMOTE_COMPLETION_INDEXING,
        GIT_REMOTE_COMPLETION_ERROR,
    }
}

pub type git_transport_message_cb =
    Option<extern "C" fn(*const c_char, c_int, *mut c_void) -> c_int>;
pub type git_cred_acquire_cb = Option<
    extern "C" fn(*mut *mut git_cred, *const c_char, *const c_char, c_uint, *mut c_void) -> c_int,
>;
pub type git_transfer_progress_cb =
    Option<extern "C" fn(*const git_indexer_progress, *mut c_void) -> c_int>;
pub type git_packbuilder_progress =
    Option<extern "C" fn(git_packbuilder_stage_t, c_uint, c_uint, *mut c_void) -> c_int>;
pub type git_push_transfer_progress =
    Option<extern "C" fn(c_uint, c_uint, size_t, *mut c_void) -> c_int>;
pub type git_transport_certificate_check_cb =
    Option<extern "C" fn(*mut git_cert, c_int, *const c_char, *mut c_void) -> c_int>;
pub type git_push_negotiation =
    Option<extern "C" fn(*mut *const git_push_update, size_t, *mut c_void) -> c_int>;

pub type git_push_update_reference_cb =
    Option<extern "C" fn(*const c_char, *const c_char, *mut c_void) -> c_int>;
pub type git_url_resolve_cb =
    Option<extern "C" fn(*mut git_buf, *const c_char, c_int, *mut c_void) -> c_int>;

#[repr(C)]
pub struct git_push_update {
    pub src_refname: *mut c_char,
    pub dst_refname: *mut c_char,
    pub src: git_oid,
    pub dst: git_oid,
}

git_enum! {
    pub enum git_cert_t {
        GIT_CERT_NONE,
        GIT_CERT_X509,
        GIT_CERT_HOSTKEY_LIBSSH2,
        GIT_CERT_STRARRAY,
    }
}

#[repr(C)]
pub struct git_cert {
    pub cert_type: git_cert_t,
}

#[repr(C)]
pub struct git_cert_hostkey {
    pub parent: git_cert,
    pub kind: git_cert_ssh_t,
    pub hash_md5: [u8; 16],
    pub hash_sha1: [u8; 20],
    pub hash_sha256: [u8; 32],
    pub raw_type: git_cert_ssh_raw_type_t,
    pub hostkey: *const c_char,
    pub hostkey_len: size_t,
}

#[repr(C)]
pub struct git_cert_x509 {
    pub parent: git_cert,
    pub data: *mut c_void,
    pub len: size_t,
}

git_enum! {
    pub enum git_cert_ssh_t {
        GIT_CERT_SSH_MD5 = 1 << 0,
        GIT_CERT_SSH_SHA1 = 1 << 1,
        GIT_CERT_SSH_SHA256 = 1 << 2,
        GIT_CERT_SSH_RAW = 1 << 3,
    }
}

git_enum! {
    pub enum git_cert_ssh_raw_type_t {
        GIT_CERT_SSH_RAW_TYPE_UNKNOWN = 0,
        GIT_CERT_SSH_RAW_TYPE_RSA = 1,
        GIT_CERT_SSH_RAW_TYPE_DSS = 2,
        GIT_CERT_SSH_RAW_TYPE_KEY_ECDSA_256 = 3,
        GIT_CERT_SSH_RAW_TYPE_KEY_ECDSA_384 = 4,
        GIT_CERT_SSH_RAW_TYPE_KEY_ECDSA_521 = 5,
        GIT_CERT_SSH_RAW_TYPE_KEY_ED25519 = 6,
    }
}

git_enum! {
    pub enum git_diff_flag_t {
        GIT_DIFF_FLAG_BINARY     = 1 << 0,
        GIT_DIFF_FLAG_NOT_BINARY = 1 << 1,
        GIT_DIFF_FLAG_VALID_ID   = 1 << 2,
        GIT_DIFF_FLAG_EXISTS     = 1 << 3,
    }
}

#[repr(C)]
pub struct git_diff_file {
    pub id: git_oid,
    pub path: *const c_char,
    pub size: git_object_size_t,
    pub flags: u32,
    pub mode: u16,
    pub id_abbrev: u16,
}

pub type git_repository_create_cb =
    Option<extern "C" fn(*mut *mut git_repository, *const c_char, c_int, *mut c_void) -> c_int>;
pub type git_remote_create_cb = Option<
    extern "C" fn(
        *mut *mut git_remote,
        *mut git_repository,
        *const c_char,
        *const c_char,
        *mut c_void,
    ) -> c_int,
>;

git_enum! {
    pub enum git_checkout_notify_t {
        GIT_CHECKOUT_NOTIFY_NONE = 0,
        GIT_CHECKOUT_NOTIFY_CONFLICT = 1 << 0,
        GIT_CHECKOUT_NOTIFY_DIRTY = 1 << 1,
        GIT_CHECKOUT_NOTIFY_UPDATED = 1 << 2,
        GIT_CHECKOUT_NOTIFY_UNTRACKED = 1 << 3,
        GIT_CHECKOUT_NOTIFY_IGNORED = 1 << 4,

        GIT_CHECKOUT_NOTIFY_ALL = 0x0FFFF,
    }
}

git_enum! {
    pub enum git_status_t {
        GIT_STATUS_CURRENT = 0,

        GIT_STATUS_INDEX_NEW = 1 << 0,
        GIT_STATUS_INDEX_MODIFIED = 1 << 1,
        GIT_STATUS_INDEX_DELETED = 1 << 2,
        GIT_STATUS_INDEX_RENAMED = 1 << 3,
        GIT_STATUS_INDEX_TYPECHANGE = 1 << 4,

        GIT_STATUS_WT_NEW = 1 << 7,
        GIT_STATUS_WT_MODIFIED = 1 << 8,
        GIT_STATUS_WT_DELETED = 1 << 9,
        GIT_STATUS_WT_TYPECHANGE = 1 << 10,
        GIT_STATUS_WT_RENAMED = 1 << 11,
        GIT_STATUS_WT_UNREADABLE = 1 << 12,

        GIT_STATUS_IGNORED = 1 << 14,
        GIT_STATUS_CONFLICTED = 1 << 15,
    }
}

git_enum! {
    pub enum git_status_opt_t {
        GIT_STATUS_OPT_INCLUDE_UNTRACKED                = 1 << 0,
        GIT_STATUS_OPT_INCLUDE_IGNORED                  = 1 << 1,
        GIT_STATUS_OPT_INCLUDE_UNMODIFIED               = 1 << 2,
        GIT_STATUS_OPT_EXCLUDE_SUBMODULES               = 1 << 3,
        GIT_STATUS_OPT_RECURSE_UNTRACKED_DIRS           = 1 << 4,
        GIT_STATUS_OPT_DISABLE_PATHSPEC_MATCH           = 1 << 5,
        GIT_STATUS_OPT_RECURSE_IGNORED_DIRS             = 1 << 6,
        GIT_STATUS_OPT_RENAMES_HEAD_TO_INDEX            = 1 << 7,
        GIT_STATUS_OPT_RENAMES_INDEX_TO_WORKDIR         = 1 << 8,
        GIT_STATUS_OPT_SORT_CASE_SENSITIVELY            = 1 << 9,
        GIT_STATUS_OPT_SORT_CASE_INSENSITIVELY          = 1 << 10,

        GIT_STATUS_OPT_RENAMES_FROM_REWRITES            = 1 << 11,
        GIT_STATUS_OPT_NO_REFRESH                       = 1 << 12,
        GIT_STATUS_OPT_UPDATE_INDEX                     = 1 << 13,
        GIT_STATUS_OPT_INCLUDE_UNREADABLE               = 1 << 14,
        GIT_STATUS_OPT_INCLUDE_UNREADABLE_AS_UNTRACKED  = 1 << 15,
    }
}

git_enum! {
    pub enum git_status_show_t {
        GIT_STATUS_SHOW_INDEX_AND_WORKDIR = 0,
        GIT_STATUS_SHOW_INDEX_ONLY = 1,
        GIT_STATUS_SHOW_WORKDIR_ONLY = 2,
    }
}

git_enum! {
    pub enum git_delta_t {
        GIT_DELTA_UNMODIFIED,
        GIT_DELTA_ADDED,
        GIT_DELTA_DELETED,
        GIT_DELTA_MODIFIED,
        GIT_DELTA_RENAMED,
        GIT_DELTA_COPIED,
        GIT_DELTA_IGNORED,
        GIT_DELTA_UNTRACKED,
        GIT_DELTA_TYPECHANGE,
        GIT_DELTA_UNREADABLE,
        GIT_DELTA_CONFLICTED,
    }
}

#[repr(C)]
pub struct git_status_options {
    pub version: c_uint,
    pub show: git_status_show_t,
    pub flags: c_uint,
    pub pathspec: git_strarray,
    pub baseline: *mut git_tree,
    pub rename_threshold: u16,
}

#[repr(C)]
pub struct git_diff_delta {
    pub status: git_delta_t,
    pub flags: u32,
    pub similarity: u16,
    pub nfiles: u16,
    pub old_file: git_diff_file,
    pub new_file: git_diff_file,
}

#[repr(C)]
pub struct git_status_entry {
    pub status: git_status_t,
    pub head_to_index: *mut git_diff_delta,
    pub index_to_workdir: *mut git_diff_delta,
}

git_enum! {
    pub enum git_checkout_strategy_t {
        GIT_CHECKOUT_NONE = 0,
        GIT_CHECKOUT_SAFE = 1 << 0,
        GIT_CHECKOUT_FORCE = 1 << 1,
        GIT_CHECKOUT_RECREATE_MISSING = 1 << 2,
        GIT_CHECKOUT_ALLOW_CONFLICTS = 1 << 4,
        GIT_CHECKOUT_REMOVE_UNTRACKED = 1 << 5,
        GIT_CHECKOUT_REMOVE_IGNORED = 1 << 6,
        GIT_CHECKOUT_UPDATE_ONLY = 1 << 7,
        GIT_CHECKOUT_DONT_UPDATE_INDEX = 1 << 8,
        GIT_CHECKOUT_NO_REFRESH = 1 << 9,
        GIT_CHECKOUT_SKIP_UNMERGED = 1 << 10,
        GIT_CHECKOUT_USE_OURS = 1 << 11,
        GIT_CHECKOUT_USE_THEIRS = 1 << 12,
        GIT_CHECKOUT_DISABLE_PATHSPEC_MATCH = 1 << 13,
        GIT_CHECKOUT_SKIP_LOCKED_DIRECTORIES = 1 << 18,
        GIT_CHECKOUT_DONT_OVERWRITE_IGNORED = 1 << 19,
        GIT_CHECKOUT_CONFLICT_STYLE_MERGE = 1 << 20,
        GIT_CHECKOUT_CONFLICT_STYLE_DIFF3 = 1 << 21,

        GIT_CHECKOUT_UPDATE_SUBMODULES = 1 << 16,
        GIT_CHECKOUT_UPDATE_SUBMODULES_IF_CHANGED = 1 << 17,
    }
}

git_enum! {
    pub enum git_reset_t {
        GIT_RESET_SOFT = 1,
        GIT_RESET_MIXED = 2,
        GIT_RESET_HARD = 3,
    }
}

git_enum! {
    pub enum git_object_t: c_int {
        GIT_OBJECT_ANY = -2,
        GIT_OBJECT_INVALID = -1,
        GIT_OBJECT_COMMIT = 1,
        GIT_OBJECT_TREE = 2,
        GIT_OBJECT_BLOB = 3,
        GIT_OBJECT_TAG = 4,
        GIT_OBJECT_OFS_DELTA = 6,
        GIT_OBJECT_REF_DELTA = 7,
    }
}

git_enum! {
    pub enum git_reference_t {
        GIT_REFERENCE_INVALID = 0,
        GIT_REFERENCE_DIRECT = 1,
        GIT_REFERENCE_SYMBOLIC = 2,
        GIT_REFERENCE_ALL = GIT_REFERENCE_DIRECT | GIT_REFERENCE_SYMBOLIC,
    }
}

git_enum! {
    pub enum git_filemode_t {
        GIT_FILEMODE_UNREADABLE = 0o000000,
        GIT_FILEMODE_TREE = 0o040000,
        GIT_FILEMODE_BLOB = 0o100644,
        GIT_FILEMODE_BLOB_GROUP_WRITABLE = 0o100664,
        GIT_FILEMODE_BLOB_EXECUTABLE = 0o100755,
        GIT_FILEMODE_LINK = 0o120000,
        GIT_FILEMODE_COMMIT = 0o160000,
    }
}

git_enum! {
    pub enum git_treewalk_mode {
        GIT_TREEWALK_PRE = 0,
        GIT_TREEWALK_POST = 1,
    }
}

pub type git_treewalk_cb =
    Option<extern "C" fn(*const c_char, *const git_tree_entry, *mut c_void) -> c_int>;
pub type git_treebuilder_filter_cb =
    Option<extern "C" fn(*const git_tree_entry, *mut c_void) -> c_int>;

pub type git_revwalk_hide_cb = Option<extern "C" fn(*const git_oid, *mut c_void) -> c_int>;

git_enum! {
    pub enum git_tree_update_t {
        GIT_TREE_UPDATE_UPSERT = 0,
        GIT_TREE_UPDATE_REMOVE = 1,
    }
}

#[repr(C)]
pub struct git_tree_update {
    pub action: git_tree_update_t,
    pub id: git_oid,
    pub filemode: git_filemode_t,
    pub path: *const c_char,
}

#[repr(C)]
#[derive(Copy, Clone)]
pub struct git_buf {
    pub ptr: *mut c_char,
    pub reserved: size_t,
    pub size: size_t,
}

git_enum! {
    pub enum git_branch_t {
        GIT_BRANCH_LOCAL = 1,
        GIT_BRANCH_REMOTE = 2,
        GIT_BRANCH_ALL = GIT_BRANCH_LOCAL | GIT_BRANCH_REMOTE,
    }
}

pub const GIT_BLAME_NORMAL: u32 = 0;
pub const GIT_BLAME_TRACK_COPIES_SAME_FILE: u32 = 1 << 0;
pub const GIT_BLAME_TRACK_COPIES_SAME_COMMIT_MOVES: u32 = 1 << 1;
pub const GIT_BLAME_TRACK_COPIES_SAME_COMMIT_COPIES: u32 = 1 << 2;
pub const GIT_BLAME_TRACK_COPIES_ANY_COMMIT_COPIES: u32 = 1 << 3;
pub const GIT_BLAME_FIRST_PARENT: u32 = 1 << 4;
pub const GIT_BLAME_USE_MAILMAP: u32 = 1 << 5;
pub const GIT_BLAME_IGNORE_WHITESPACE: u32 = 1 << 6;

#[repr(C)]
#[derive(Copy, Clone)]
pub struct git_blame_options {
    pub version: c_uint,

    pub flags: u32,
    pub min_match_characters: u16,
    pub newest_commit: git_oid,
    pub oldest_commit: git_oid,
    pub min_line: usize,
    pub max_line: usize,
}

#[repr(C)]
#[derive(Copy, Clone)]
pub struct git_blame_hunk {
    pub lines_in_hunk: usize,
    pub final_commit_id: git_oid,
    pub final_start_line_number: usize,
    pub final_signature: *mut git_signature,
    pub orig_commit_id: git_oid,
    pub orig_path: *const c_char,
    pub orig_start_line_number: usize,
    pub orig_signature: *mut git_signature,
    pub boundary: c_char,
}

pub type git_index_matched_path_cb =
    Option<extern "C" fn(*const c_char, *const c_char, *mut c_void) -> c_int>;

git_enum! {
    pub enum git_index_entry_extended_flag_t {
        GIT_INDEX_ENTRY_INTENT_TO_ADD     = 1 << 13,
        GIT_INDEX_ENTRY_SKIP_WORKTREE     = 1 << 14,

        GIT_INDEX_ENTRY_UPTODATE          = 1 << 2,
    }
}

git_enum! {
    pub enum git_index_entry_flag_t {
        GIT_INDEX_ENTRY_EXTENDED = 0x4000,
        GIT_INDEX_ENTRY_VALID    = 0x8000,
    }
}

#[repr(C)]
#[derive(Copy, Clone)]
pub struct git_index_entry {
    pub ctime: git_index_time,
    pub mtime: git_index_time,
    pub dev: u32,
    pub ino: u32,
    pub mode: u32,
    pub uid: u32,
    pub gid: u32,
    pub file_size: u32,
    pub id: git_oid,
    pub flags: u16,
    pub flags_extended: u16,
    pub path: *const c_char,
}

pub const GIT_INDEX_ENTRY_NAMEMASK: u16 = 0xfff;
pub const GIT_INDEX_ENTRY_STAGEMASK: u16 = 0x3000;
pub const GIT_INDEX_ENTRY_STAGESHIFT: u16 = 12;

#[repr(C)]
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub struct git_index_time {
    pub seconds: i32,
    pub nanoseconds: u32,
}

#[repr(C)]
pub struct git_config_entry {
    pub name: *const c_char,
    pub value: *const c_char,
    pub include_depth: c_uint,
    pub level: git_config_level_t,
    pub free: Option<extern "C" fn(*mut git_config_entry)>,
    pub payload: *mut c_void,
}

git_enum! {
    pub enum git_config_level_t: c_int {
        GIT_CONFIG_LEVEL_PROGRAMDATA = 1,
        GIT_CONFIG_LEVEL_SYSTEM = 2,
        GIT_CONFIG_LEVEL_XDG = 3,
        GIT_CONFIG_LEVEL_GLOBAL = 4,
        GIT_CONFIG_LEVEL_LOCAL = 5,
        GIT_CONFIG_LEVEL_APP = 6,
        GIT_CONFIG_HIGHEST_LEVEL = -1,
    }
}

git_enum! {
    pub enum git_submodule_update_t {
        GIT_SUBMODULE_UPDATE_CHECKOUT = 1,
        GIT_SUBMODULE_UPDATE_REBASE   = 2,
        GIT_SUBMODULE_UPDATE_MERGE    = 3,
        GIT_SUBMODULE_UPDATE_NONE     = 4,
        GIT_SUBMODULE_UPDATE_DEFAULT  = 0,
    }
}

git_enum! {
    pub enum git_submodule_ignore_t: c_int {
        GIT_SUBMODULE_IGNORE_UNSPECIFIED = -1,

        GIT_SUBMODULE_IGNORE_NONE      = 1,
        GIT_SUBMODULE_IGNORE_UNTRACKED = 2,
        GIT_SUBMODULE_IGNORE_DIRTY     = 3,
        GIT_SUBMODULE_IGNORE_ALL       = 4,
    }
}

pub type git_submodule_cb =
    Option<extern "C" fn(*mut git_submodule, *const c_char, *mut c_void) -> c_int>;

#[repr(C)]
pub struct git_submodule_update_options {
    pub version: c_uint,
    pub checkout_opts: git_checkout_options,
    pub fetch_opts: git_fetch_options,
    pub allow_fetch: c_int,
}

#[repr(C)]
pub struct git_writestream {
    pub write: Option<extern "C" fn(*mut git_writestream, *const c_char, size_t) -> c_int>,
    pub close: Option<extern "C" fn(*mut git_writestream) -> c_int>,
    pub free: Option<extern "C" fn(*mut git_writestream)>,
}

git_enum! {
    pub enum git_attr_value_t {
        GIT_ATTR_VALUE_UNSPECIFIED = 0,
        GIT_ATTR_VALUE_TRUE,
        GIT_ATTR_VALUE_FALSE,
        GIT_ATTR_VALUE_STRING,
    }
}

pub const GIT_ATTR_CHECK_FILE_THEN_INDEX: u32 = 0;
pub const GIT_ATTR_CHECK_INDEX_THEN_FILE: u32 = 1;
pub const GIT_ATTR_CHECK_INDEX_ONLY: u32 = 2;
pub const GIT_ATTR_CHECK_NO_SYSTEM: u32 = 1 << 2;
pub const GIT_ATTR_CHECK_INCLUDE_HEAD: u32 = 1 << 3;

#[repr(C)]
pub struct git_cred {
    pub credtype: git_credtype_t,
    pub free: Option<extern "C" fn(*mut git_cred)>,
}

git_enum! {
    pub enum git_credtype_t {
        GIT_CREDTYPE_USERPASS_PLAINTEXT = 1 << 0,
        GIT_CREDTYPE_SSH_KEY = 1 << 1,
        GIT_CREDTYPE_SSH_CUSTOM = 1 << 2,
        GIT_CREDTYPE_DEFAULT = 1 << 3,
        GIT_CREDTYPE_SSH_INTERACTIVE = 1 << 4,
        GIT_CREDTYPE_USERNAME = 1 << 5,
        GIT_CREDTYPE_SSH_MEMORY = 1 << 6,
    }
}

pub type git_cred_ssh_interactive_callback = Option<
    extern "C" fn(
        name: *const c_char,
        name_len: c_int,
        instruction: *const c_char,
        instruction_len: c_int,
        num_prompts: c_int,
        prompts: *const LIBSSH2_USERAUTH_KBDINT_PROMPT,
        responses: *mut LIBSSH2_USERAUTH_KBDINT_RESPONSE,
        abstrakt: *mut *mut c_void,
    ),
>;

pub type git_cred_sign_callback = Option<
    extern "C" fn(
        session: *mut LIBSSH2_SESSION,
        sig: *mut *mut c_uchar,
        sig_len: *mut size_t,
        data: *const c_uchar,
        data_len: size_t,
        abstrakt: *mut *mut c_void,
    ),
>;

pub enum LIBSSH2_SESSION {}
pub enum LIBSSH2_USERAUTH_KBDINT_PROMPT {}
pub enum LIBSSH2_USERAUTH_KBDINT_RESPONSE {}

#[repr(C)]
pub struct git_push_options {
    pub version: c_uint,
    pub pb_parallelism: c_uint,
    pub callbacks: git_remote_callbacks,
    pub proxy_opts: git_proxy_options,
    pub follow_redirects: git_remote_redirect_t,
    pub custom_headers: git_strarray,
}

pub type git_tag_foreach_cb =
    Option<extern "C" fn(name: *const c_char, oid: *mut git_oid, payload: *mut c_void) -> c_int>;

git_enum! {
    pub enum git_index_add_option_t {
        GIT_INDEX_ADD_DEFAULT = 0,
        GIT_INDEX_ADD_FORCE = 1 << 0,
        GIT_INDEX_ADD_DISABLE_PATHSPEC_MATCH = 1 << 1,
        GIT_INDEX_ADD_CHECK_PATHSPEC = 1 << 2,
    }
}

git_enum! {
    pub enum git_repository_open_flag_t {
        GIT_REPOSITORY_OPEN_NO_SEARCH = 1 << 0,
        GIT_REPOSITORY_OPEN_CROSS_FS = 1 << 1,
        GIT_REPOSITORY_OPEN_BARE = 1 << 2,
        GIT_REPOSITORY_OPEN_NO_DOTGIT = 1 << 3,
        GIT_REPOSITORY_OPEN_FROM_ENV = 1 << 4,
    }
}

#[repr(C)]
pub struct git_repository_init_options {
    pub version: c_uint,
    pub flags: u32,
    pub mode: u32,
    pub workdir_path: *const c_char,
    pub description: *const c_char,
    pub template_path: *const c_char,
    pub initial_head: *const c_char,
    pub origin_url: *const c_char,
}

pub const GIT_REPOSITORY_INIT_OPTIONS_VERSION: c_uint = 1;

git_enum! {
    pub enum git_repository_init_flag_t {
        GIT_REPOSITORY_INIT_BARE              = 1 << 0,
        GIT_REPOSITORY_INIT_NO_REINIT         = 1 << 1,
        GIT_REPOSITORY_INIT_NO_DOTGIT_DIR     = 1 << 2,
        GIT_REPOSITORY_INIT_MKDIR             = 1 << 3,
        GIT_REPOSITORY_INIT_MKPATH            = 1 << 4,
        GIT_REPOSITORY_INIT_EXTERNAL_TEMPLATE = 1 << 5,
    }
}

git_enum! {
    pub enum git_repository_init_mode_t {
        GIT_REPOSITORY_INIT_SHARED_UMASK = 0,
        GIT_REPOSITORY_INIT_SHARED_GROUP = 0o002775,
        GIT_REPOSITORY_INIT_SHARED_ALL   = 0o002777,
    }
}

git_enum! {
    pub enum git_sort_t {
        GIT_SORT_NONE        = 0,
        GIT_SORT_TOPOLOGICAL = 1 << 0,
        GIT_SORT_TIME        = 1 << 1,
        GIT_SORT_REVERSE     = 1 << 2,
    }
}

git_enum! {
    pub enum git_submodule_status_t {
        GIT_SUBMODULE_STATUS_IN_HEAD = 1 << 0,
        GIT_SUBMODULE_STATUS_IN_INDEX = 1 << 1,
        GIT_SUBMODULE_STATUS_IN_CONFIG = 1 << 2,
        GIT_SUBMODULE_STATUS_IN_WD = 1 << 3,
        GIT_SUBMODULE_STATUS_INDEX_ADDED = 1 << 4,
        GIT_SUBMODULE_STATUS_INDEX_DELETED = 1 << 5,
        GIT_SUBMODULE_STATUS_INDEX_MODIFIED = 1 << 6,
        GIT_SUBMODULE_STATUS_WD_UNINITIALIZED = 1 << 7,
        GIT_SUBMODULE_STATUS_WD_ADDED = 1 << 8,
        GIT_SUBMODULE_STATUS_WD_DELETED = 1 << 9,
        GIT_SUBMODULE_STATUS_WD_MODIFIED = 1 << 10,
        GIT_SUBMODULE_STATUS_WD_INDEX_MODIFIED = 1 << 11,
        GIT_SUBMODULE_STATUS_WD_WD_MODIFIED = 1 << 12,
        GIT_SUBMODULE_STATUS_WD_UNTRACKED = 1 << 13,
    }
}

#[repr(C)]
pub struct git_remote_head {
    pub local: c_int,
    pub oid: git_oid,
    pub loid: git_oid,
    pub name: *mut c_char,
    pub symref_target: *mut c_char,
}

git_enum! {
    pub enum git_pathspec_flag_t {
        GIT_PATHSPEC_DEFAULT = 0,
        GIT_PATHSPEC_IGNORE_CASE = 1 << 0,
        GIT_PATHSPEC_USE_CASE = 1 << 1,
        GIT_PATHSPEC_NO_GLOB = 1 << 2,
        GIT_PATHSPEC_NO_MATCH_ERROR = 1 << 3,
        GIT_PATHSPEC_FIND_FAILURES = 1 << 4,
        GIT_PATHSPEC_FAILURES_ONLY = 1 << 5,
    }
}

pub type git_diff_file_cb = Option<extern "C" fn(*const git_diff_delta, f32, *mut c_void) -> c_int>;
pub type git_diff_hunk_cb =
    Option<extern "C" fn(*const git_diff_delta, *const git_diff_hunk, *mut c_void) -> c_int>;
pub type git_diff_line_cb = Option<
    extern "C" fn(
        *const git_diff_delta,
        *const git_diff_hunk,
        *const git_diff_line,
        *mut c_void,
    ) -> c_int,
>;
pub type git_diff_binary_cb =
    Option<extern "C" fn(*const git_diff_delta, *const git_diff_binary, *mut c_void) -> c_int>;

#[repr(C)]
pub struct git_diff_hunk {
    pub old_start: c_int,
    pub old_lines: c_int,
    pub new_start: c_int,
    pub new_lines: c_int,
    pub header_len: size_t,
    pub header: [c_char; 128],
}

git_enum! {
    pub enum git_diff_line_t {
        GIT_DIFF_LINE_CONTEXT = b' ' as git_diff_line_t,
        GIT_DIFF_LINE_ADDITION = b'+' as git_diff_line_t,
        GIT_DIFF_LINE_DELETION = b'-' as git_diff_line_t,
        GIT_DIFF_LINE_CONTEXT_EOFNL = b'=' as git_diff_line_t,
        GIT_DIFF_LINE_ADD_EOFNL = b'>' as git_diff_line_t,
        GIT_DIFF_LINE_DEL_EOFNL = b'<' as git_diff_line_t,
        GIT_DIFF_LINE_FILE_HDR = b'F' as git_diff_line_t,
        GIT_DIFF_LINE_HUNK_HDR = b'H' as git_diff_line_t,
        GIT_DIFF_LINE_BINARY = b'B' as git_diff_line_t,
    }
}

#[repr(C)]
pub struct git_diff_line {
    pub origin: c_char,
    pub old_lineno: c_int,
    pub new_lineno: c_int,
    pub num_lines: c_int,
    pub content_len: size_t,
    pub content_offset: git_off_t,
    pub content: *const c_char,
}

#[repr(C)]
pub struct git_diff_options {
    pub version: c_uint,
    pub flags: u32,
    pub ignore_submodules: git_submodule_ignore_t,
    pub pathspec: git_strarray,
    pub notify_cb: git_diff_notify_cb,
    pub progress_cb: git_diff_progress_cb,
    pub payload: *mut c_void,
    pub context_lines: u32,
    pub interhunk_lines: u32,
    pub oid_type: git_oid_t,
    pub id_abbrev: u16,
    pub max_size: git_off_t,
    pub old_prefix: *const c_char,
    pub new_prefix: *const c_char,
}

git_enum! {
    pub enum git_oid_t {
        GIT_OID_SHA1 = 1,
        // SHA256 is still experimental so we are not going to enable it.
        /* GIT_OID_SHA256 = 2, */
    }
}

git_enum! {
    pub enum git_diff_format_t {
        GIT_DIFF_FORMAT_PATCH = 1,
        GIT_DIFF_FORMAT_PATCH_HEADER = 2,
        GIT_DIFF_FORMAT_RAW = 3,
        GIT_DIFF_FORMAT_NAME_ONLY = 4,
        GIT_DIFF_FORMAT_NAME_STATUS = 5,
        GIT_DIFF_FORMAT_PATCH_ID = 6,
    }
}

git_enum! {
    pub enum git_diff_stats_format_t {
        GIT_DIFF_STATS_NONE = 0,
        GIT_DIFF_STATS_FULL = 1 << 0,
        GIT_DIFF_STATS_SHORT = 1 << 1,
        GIT_DIFF_STATS_NUMBER = 1 << 2,
        GIT_DIFF_STATS_INCLUDE_SUMMARY = 1 << 3,
    }
}

pub type git_diff_notify_cb = Option<
    extern "C" fn(*const git_diff, *const git_diff_delta, *const c_char, *mut c_void) -> c_int,
>;

pub type git_diff_progress_cb =
    Option<extern "C" fn(*const git_diff, *const c_char, *const c_char, *mut c_void) -> c_int>;

git_enum! {
    pub enum git_diff_option_t {
        GIT_DIFF_NORMAL = 0,
        GIT_DIFF_REVERSE = 1 << 0,
        GIT_DIFF_INCLUDE_IGNORED = 1 << 1,
        GIT_DIFF_RECURSE_IGNORED_DIRS = 1 << 2,
        GIT_DIFF_INCLUDE_UNTRACKED = 1 << 3,
        GIT_DIFF_RECURSE_UNTRACKED_DIRS = 1 << 4,
        GIT_DIFF_INCLUDE_UNMODIFIED = 1 << 5,
        GIT_DIFF_INCLUDE_TYPECHANGE = 1 << 6,
        GIT_DIFF_INCLUDE_TYPECHANGE_TREES = 1 << 7,
        GIT_DIFF_IGNORE_FILEMODE = 1 << 8,
        GIT_DIFF_IGNORE_SUBMODULES = 1 << 9,
        GIT_DIFF_IGNORE_CASE = 1 << 10,
        GIT_DIFF_DISABLE_PATHSPEC_MATCH = 1 << 12,
        GIT_DIFF_SKIP_BINARY_CHECK = 1 << 13,
        GIT_DIFF_ENABLE_FAST_UNTRACKED_DIRS = 1 << 14,
        GIT_DIFF_UPDATE_INDEX = 1 << 15,
        GIT_DIFF_INCLUDE_UNREADABLE = 1 << 16,
        GIT_DIFF_INCLUDE_UNREADABLE_AS_UNTRACKED = 1 << 17,
        GIT_DIFF_INDENT_HEURISTIC = 1 << 18,
        GIT_DIFF_IGNORE_BLANK_LINES = 1 << 19,
        GIT_DIFF_FORCE_TEXT = 1 << 20,
        GIT_DIFF_FORCE_BINARY = 1 << 21,
        GIT_DIFF_IGNORE_WHITESPACE = 1 << 22,
        GIT_DIFF_IGNORE_WHITESPACE_CHANGE = 1 << 23,
        GIT_DIFF_IGNORE_WHITESPACE_EOL = 1 << 24,
        GIT_DIFF_SHOW_UNTRACKED_CONTENT = 1 << 25,
        GIT_DIFF_SHOW_UNMODIFIED = 1 << 26,
        GIT_DIFF_PATIENCE = 1 << 28,
        GIT_DIFF_MINIMAL = 1 << 29,
        GIT_DIFF_SHOW_BINARY = 1 << 30,
    }
}

#[repr(C)]
pub struct git_diff_find_options {
    pub version: c_uint,
    pub flags: u32,
    pub rename_threshold: u16,
    pub rename_from_rewrite_threshold: u16,
    pub copy_threshold: u16,
    pub break_rewrite_threshold: u16,
    pub rename_limit: size_t,
    pub metric: *mut git_diff_similarity_metric,
}

#[repr(C)]
pub struct git_diff_similarity_metric {
    pub file_signature: Option<
        extern "C" fn(*mut *mut c_void, *const git_diff_file, *const c_char, *mut c_void) -> c_int,
    >,
    pub buffer_signature: Option<
        extern "C" fn(
            *mut *mut c_void,
            *const git_diff_file,
            *const c_char,
            size_t,
            *mut c_void,
        ) -> c_int,
    >,
    pub free_signature: Option<extern "C" fn(*mut c_void, *mut c_void)>,
    pub similarity:
        Option<extern "C" fn(*mut c_int, *mut c_void, *mut c_void, *mut c_void) -> c_int>,
    pub payload: *mut c_void,
}

pub const GIT_DIFF_FIND_OPTIONS_VERSION: c_uint = 1;

pub const GIT_DIFF_FIND_BY_CONFIG: u32 = 0;
pub const GIT_DIFF_FIND_RENAMES: u32 = 1 << 0;
pub const GIT_DIFF_FIND_RENAMES_FROM_REWRITES: u32 = 1 << 1;
pub const GIT_DIFF_FIND_COPIES: u32 = 1 << 2;
pub const GIT_DIFF_FIND_COPIES_FROM_UNMODIFIED: u32 = 1 << 3;
pub const GIT_DIFF_FIND_REWRITES: u32 = 1 << 4;
pub const GIT_DIFF_BREAK_REWRITES: u32 = 1 << 5;
pub const GIT_DIFF_FIND_AND_BREAK_REWRITES: u32 = GIT_DIFF_FIND_REWRITES | GIT_DIFF_BREAK_REWRITES;
pub const GIT_DIFF_FIND_FOR_UNTRACKED: u32 = 1 << 6;
pub const GIT_DIFF_FIND_ALL: u32 = 0x0ff;
pub const GIT_DIFF_FIND_IGNORE_LEADING_WHITESPACE: u32 = 0;
pub const GIT_DIFF_FIND_IGNORE_WHITESPACE: u32 = 1 << 12;
pub const GIT_DIFF_FIND_DONT_IGNORE_WHITESPACE: u32 = 1 << 13;
pub const GIT_DIFF_FIND_EXACT_MATCH_ONLY: u32 = 1 << 14;
pub const GIT_DIFF_BREAK_REWRITES_FOR_RENAMES_ONLY: u32 = 1 << 15;
pub const GIT_DIFF_FIND_REMOVE_UNMODIFIED: u32 = 1 << 16;

#[repr(C)]
pub struct git_diff_format_email_options {
    pub version: c_uint,
    pub flags: u32,
    pub patch_no: usize,
    pub total_patches: usize,
    pub id: *const git_oid,
    pub summary: *const c_char,
    pub body: *const c_char,
    pub author: *const git_signature,
}

pub const GIT_DIFF_FORMAT_EMAIL_OPTIONS_VERSION: c_uint = 1;

pub const GIT_DIFF_FORMAT_EMAIL_NONE: u32 = 0;
pub const GIT_DIFF_FORMAT_EMAIL_EXCLUDE_SUBJECT_PATCH_MARKER: u32 = 1 << 0;

#[repr(C)]
pub struct git_diff_patchid_options {
    pub version: c_uint,
}

pub const GIT_DIFF_PATCHID_OPTIONS_VERSION: c_uint = 1;

#[repr(C)]
pub struct git_diff_binary {
    pub contains_data: c_uint,
    pub old_file: git_diff_binary_file,
    pub new_file: git_diff_binary_file,
}

#[repr(C)]
pub struct git_diff_binary_file {
    pub kind: git_diff_binary_t,
    pub data: *const c_char,
    pub datalen: size_t,
    pub inflatedlen: size_t,
}

git_enum! {
    pub enum git_diff_binary_t {
        GIT_DIFF_BINARY_NONE,
        GIT_DIFF_BINARY_LITERAL,
        GIT_DIFF_BINARY_DELTA,
    }
}

#[repr(C)]
pub struct git_merge_options {
    pub version: c_uint,
    pub flags: u32,
    pub rename_threshold: c_uint,
    pub target_limit: c_uint,
    pub metric: *mut git_diff_similarity_metric,
    pub recursion_limit: c_uint,
    pub default_driver: *const c_char,
    pub file_favor: git_merge_file_favor_t,
    pub file_flags: u32,
}

git_enum! {
    pub enum git_merge_flag_t {
        GIT_MERGE_FIND_RENAMES = 1 << 0,
        GIT_MERGE_FAIL_ON_CONFLICT = 1 << 1,
        GIT_MERGE_SKIP_REUC = 1 << 2,
        GIT_MERGE_NO_RECURSIVE = 1 << 3,
    }
}

git_enum! {
    pub enum git_merge_file_favor_t {
        GIT_MERGE_FILE_FAVOR_NORMAL = 0,
        GIT_MERGE_FILE_FAVOR_OURS = 1,
        GIT_MERGE_FILE_FAVOR_THEIRS = 2,
        GIT_MERGE_FILE_FAVOR_UNION = 3,
    }
}

git_enum! {
    pub enum git_merge_file_flag_t {
        GIT_MERGE_FILE_DEFAULT = 0,
        GIT_MERGE_FILE_STYLE_MERGE = 1 << 0,
        GIT_MERGE_FILE_STYLE_DIFF3 = 1 << 1,
        GIT_MERGE_FILE_SIMPLIFY_ALNUM = 1 << 2,
        GIT_MERGE_FILE_IGNORE_WHITESPACE = 1 << 3,
        GIT_MERGE_FILE_IGNORE_WHITESPACE_CHANGE = 1 << 4,
        GIT_MERGE_FILE_IGNORE_WHITESPACE_EOL = 1 << 5,
        GIT_MERGE_FILE_DIFF_PATIENCE = 1 << 6,
        GIT_MERGE_FILE_DIFF_MINIMAL = 1 << 7,
    }
}

git_enum! {
    pub enum git_merge_analysis_t {
        GIT_MERGE_ANALYSIS_NONE = 0,
        GIT_MERGE_ANALYSIS_NORMAL = 1 << 0,
        GIT_MERGE_ANALYSIS_UP_TO_DATE = 1 << 1,
        GIT_MERGE_ANALYSIS_FASTFORWARD = 1 << 2,
        GIT_MERGE_ANALYSIS_UNBORN = 1 << 3,
    }
}

git_enum! {
    pub enum git_merge_preference_t {
        GIT_MERGE_PREFERENCE_NONE = 0,
        GIT_MERGE_PREFERENCE_NO_FASTFORWARD = 1 << 0,
        GIT_MERGE_PREFERENCE_FASTFORWARD_ONLY = 1 << 1,
    }
}

pub type git_transport_cb = Option<
    extern "C" fn(
        out: *mut *mut git_transport,
        owner: *mut git_remote,
        param: *mut c_void,
    ) -> c_int,
>;

#[repr(C)]
pub struct git_transport {
    pub version: c_uint,
    pub connect: Option<
        extern "C" fn(
            transport: *mut git_transport,
            url: *const c_char,
            direction: c_int,
            connect_opts: *const git_remote_connect_options,
        ) -> c_int,
    >,
    pub set_connect_opts: Option<
        extern "C" fn(
            transport: *mut git_transport,
            connect_opts: *const git_remote_connect_options,
        ) -> c_int,
    >,
    pub capabilities:
        Option<extern "C" fn(capabilities: *mut c_uint, transport: *mut git_transport) -> c_int>,
    pub ls: Option<
        extern "C" fn(
            out: *mut *mut *const git_remote_head,
            size: *mut size_t,
            transport: *mut git_transport,
        ) -> c_int,
    >,
    pub push: Option<extern "C" fn(transport: *mut git_transport, push: *mut git_push) -> c_int>,
    pub negotiate_fetch: Option<
        extern "C" fn(
            transport: *mut git_transport,
            repo: *mut git_repository,
            fetch_data: *const git_fetch_negotiation,
        ) -> c_int,
    >,
    pub shallow_roots:
        Option<extern "C" fn(out: *mut git_oidarray, transport: *mut git_transport) -> c_int>,
    pub download_pack: Option<
        extern "C" fn(
            transport: *mut git_transport,
            repo: *mut git_repository,
            stats: *mut git_indexer_progress,
        ) -> c_int,
    >,
    pub is_connected: Option<extern "C" fn(transport: *mut git_transport) -> c_int>,
    pub cancel: Option<extern "C" fn(transport: *mut git_transport)>,
    pub close: Option<extern "C" fn(transport: *mut git_transport) -> c_int>,
    pub free: Option<extern "C" fn(transport: *mut git_transport)>,
}

#[repr(C)]
pub struct git_remote_connect_options {
    pub version: c_uint,
    pub callbacks: git_remote_callbacks,
    pub proxy_opts: git_proxy_options,
    pub follow_redirects: git_remote_redirect_t,
    pub custom_headers: git_strarray,
}

git_enum! {
    pub enum git_remote_redirect_t {
        GIT_REMOTE_REDIRECT_NONE = 1 << 0,
        GIT_REMOTE_REDIRECT_INITIAL = 1 << 1,
        GIT_REMOTE_REDIRECT_ALL = 1 << 2,
    }
}

#[repr(C)]
pub struct git_odb_backend {
    pub version: c_uint,
    pub odb: *mut git_odb,
    pub read: Option<
        extern "C" fn(
            *mut *mut c_void,
            *mut size_t,
            *mut git_object_t,
            *mut git_odb_backend,
            *const git_oid,
        ) -> c_int,
    >,

    pub read_prefix: Option<
        extern "C" fn(
            *mut git_oid,
            *mut *mut c_void,
            *mut size_t,
            *mut git_object_t,
            *mut git_odb_backend,
            *const git_oid,
            size_t,
        ) -> c_int,
    >,
    pub read_header: Option<
        extern "C" fn(
            *mut size_t,
            *mut git_object_t,
            *mut git_odb_backend,
            *const git_oid,
        ) -> c_int,
    >,

    pub write: Option<
        extern "C" fn(
            *mut git_odb_backend,
            *const git_oid,
            *const c_void,
            size_t,
            git_object_t,
        ) -> c_int,
    >,

    pub writestream: Option<
        extern "C" fn(
            *mut *mut git_odb_stream,
            *mut git_odb_backend,
            git_object_size_t,
            git_object_t,
        ) -> c_int,
    >,

    pub readstream: Option<
        extern "C" fn(
            *mut *mut git_odb_stream,
            *mut size_t,
            *mut git_object_t,
            *mut git_odb_backend,
            *const git_oid,
        ) -> c_int,
    >,

    pub exists: Option<extern "C" fn(*mut git_odb_backend, *const git_oid) -> c_int>,

    pub exists_prefix:
        Option<extern "C" fn(*mut git_oid, *mut git_odb_backend, *const git_oid, size_t) -> c_int>,

    pub refresh: Option<extern "C" fn(*mut git_odb_backend) -> c_int>,

    pub foreach:
        Option<extern "C" fn(*mut git_odb_backend, git_odb_foreach_cb, *mut c_void) -> c_int>,

    pub writepack: Option<
        extern "C" fn(
            *mut *mut git_odb_writepack,
            *mut git_odb_backend,
            *mut git_odb,
            git_indexer_progress_cb,
            *mut c_void,
        ) -> c_int,
    >,

    pub writemidx: Option<extern "C" fn(*mut git_odb_backend) -> c_int>,

    pub freshen: Option<extern "C" fn(*mut git_odb_backend, *const git_oid) -> c_int>,

    pub free: Option<extern "C" fn(*mut git_odb_backend)>,
}

git_enum! {
    pub enum git_odb_lookup_flags_t {
        GIT_ODB_LOOKUP_NO_REFRESH = 1 << 0,
    }
}

#[repr(C)]
pub struct git_odb_writepack {
    pub backend: *mut git_odb_backend,

    pub append: Option<
        extern "C" fn(
            *mut git_odb_writepack,
            *const c_void,
            size_t,
            *mut git_indexer_progress,
        ) -> c_int,
    >,

    pub commit:
        Option<unsafe extern "C" fn(*mut git_odb_writepack, *mut git_indexer_progress) -> c_int>,

    pub free: Option<unsafe extern "C" fn(*mut git_odb_writepack)>,
}

#[repr(C)]
pub struct git_refdb_backend {
    pub version: c_uint,
    pub exists: Option<extern "C" fn(*mut c_int, *mut git_refdb_backend, *const c_char) -> c_int>,
    pub lookup: Option<
        extern "C" fn(*mut *mut git_reference, *mut git_refdb_backend, *const c_char) -> c_int,
    >,
    pub iterator: Option<
        extern "C" fn(
            *mut *mut git_reference_iterator,
            *mut git_refdb_backend,
            *const c_char,
        ) -> c_int,
    >,
    pub write: Option<
        extern "C" fn(
            *mut git_refdb_backend,
            *const git_reference,
            c_int,
            *const git_signature,
            *const c_char,
            *const git_oid,
            *const c_char,
        ) -> c_int,
    >,
    pub rename: Option<
        extern "C" fn(
            *mut *mut git_reference,
            *mut git_refdb_backend,
            *const c_char,
            *const c_char,
            c_int,
            *const git_signature,
            *const c_char,
        ) -> c_int,
    >,
    pub del: Option<
        extern "C" fn(
            *mut git_refdb_backend,
            *const c_char,
            *const git_oid,
            *const c_char,
        ) -> c_int,
    >,
    pub compress: Option<extern "C" fn(*mut git_refdb_backend) -> c_int>,
    pub has_log: Option<extern "C" fn(*mut git_refdb_backend, *const c_char) -> c_int>,
    pub ensure_log: Option<extern "C" fn(*mut git_refdb_backend, *const c_char) -> c_int>,
    pub free: Option<extern "C" fn(*mut git_refdb_backend)>,
    pub reflog_read:
        Option<extern "C" fn(*mut *mut git_reflog, *mut git_refdb_backend, *const c_char) -> c_int>,
    pub reflog_write: Option<extern "C" fn(*mut git_refdb_backend, *mut git_reflog) -> c_int>,
    pub reflog_rename:
        Option<extern "C" fn(*mut git_refdb_backend, *const c_char, *const c_char) -> c_int>,
    pub reflog_delete: Option<extern "C" fn(*mut git_refdb_backend, *const c_char) -> c_int>,
    pub lock:
        Option<extern "C" fn(*mut *mut c_void, *mut git_refdb_backend, *const c_char) -> c_int>,
    pub unlock: Option<
        extern "C" fn(
            *mut git_refdb_backend,
            *mut c_void,
            c_int,
            c_int,
            *const git_reference,
            *const git_signature,
            *const c_char,
        ) -> c_int,
    >,
}

#[repr(C)]
pub struct git_proxy_options {
    pub version: c_uint,
    pub kind: git_proxy_t,
    pub url: *const c_char,
    pub credentials: git_cred_acquire_cb,
    pub certificate_check: git_transport_certificate_check_cb,
    pub payload: *mut c_void,
}

git_enum! {
    pub enum git_proxy_t {
        GIT_PROXY_NONE = 0,
        GIT_PROXY_AUTO = 1,
        GIT_PROXY_SPECIFIED = 2,
    }
}

git_enum! {
    pub enum git_smart_service_t {
        GIT_SERVICE_UPLOADPACK_LS = 1,
        GIT_SERVICE_UPLOADPACK = 2,
        GIT_SERVICE_RECEIVEPACK_LS = 3,
        GIT_SERVICE_RECEIVEPACK = 4,
    }
}

#[repr(C)]
pub struct git_smart_subtransport_stream {
    pub subtransport: *mut git_smart_subtransport,
    pub read: Option<
        extern "C" fn(
            *mut git_smart_subtransport_stream,
            *mut c_char,
            size_t,
            *mut size_t,
        ) -> c_int,
    >,
    pub write:
        Option<extern "C" fn(*mut git_smart_subtransport_stream, *const c_char, size_t) -> c_int>,
    pub free: Option<extern "C" fn(*mut git_smart_subtransport_stream)>,
}

#[repr(C)]
pub struct git_smart_subtransport {
    pub action: Option<
        extern "C" fn(
            *mut *mut git_smart_subtransport_stream,
            *mut git_smart_subtransport,
            *const c_char,
            git_smart_service_t,
        ) -> c_int,
    >,
    pub close: Option<extern "C" fn(*mut git_smart_subtransport) -> c_int>,
    pub free: Option<extern "C" fn(*mut git_smart_subtransport)>,
}

pub type git_smart_subtransport_cb = Option<
    extern "C" fn(*mut *mut git_smart_subtransport, *mut git_transport, *mut c_void) -> c_int,
>;

#[repr(C)]
pub struct git_smart_subtransport_definition {
    pub callback: git_smart_subtransport_cb,
    pub rpc: c_uint,
    pub param: *mut c_void,
}

#[repr(C)]
pub struct git_describe_options {
    pub version: c_uint,
    pub max_candidates_tags: c_uint,
    pub describe_strategy: c_uint,
    pub pattern: *const c_char,
    pub only_follow_first_parent: c_int,
    pub show_commit_oid_as_fallback: c_int,
}

git_enum! {
    pub enum git_describe_strategy_t {
        GIT_DESCRIBE_DEFAULT,
        GIT_DESCRIBE_TAGS,
        GIT_DESCRIBE_ALL,
    }
}

#[repr(C)]
pub struct git_describe_format_options {
    pub version: c_uint,
    pub abbreviated_size: c_uint,
    pub always_use_long_format: c_int,
    pub dirty_suffix: *const c_char,
}

git_enum! {
    pub enum git_packbuilder_stage_t {
        GIT_PACKBUILDER_ADDING_OBJECTS,
        GIT_PACKBUILDER_DELTAFICATION,
    }
}

git_enum! {
    pub enum git_stash_flags {
        GIT_STASH_DEFAULT = 0,
        GIT_STASH_KEEP_INDEX = 1 << 0,
        GIT_STASH_INCLUDE_UNTRACKED = 1 << 1,
        GIT_STASH_INCLUDE_IGNORED = 1 << 2,
        GIT_STASH_KEEP_ALL = 1 << 3,
    }
}

git_enum! {
    pub enum git_stash_apply_flags {
        GIT_STASH_APPLY_DEFAULT = 0,
        GIT_STASH_APPLY_REINSTATE_INDEX = 1 << 0,
    }
}

git_enum! {
    pub enum git_stash_apply_progress_t {
        GIT_STASH_APPLY_PROGRESS_NONE = 0,
        GIT_STASH_APPLY_PROGRESS_LOADING_STASH,
        GIT_STASH_APPLY_PROGRESS_ANALYZE_INDEX,
        GIT_STASH_APPLY_PROGRESS_ANALYZE_MODIFIED,
        GIT_STASH_APPLY_PROGRESS_ANALYZE_UNTRACKED,
        GIT_STASH_APPLY_PROGRESS_CHECKOUT_UNTRACKED,
        GIT_STASH_APPLY_PROGRESS_CHECKOUT_MODIFIED,
        GIT_STASH_APPLY_PROGRESS_DONE,
    }
}

#[repr(C)]
pub struct git_stash_save_options {
    pub version: c_uint,
    pub flags: u32,
    pub stasher: *const git_signature,
    pub message: *const c_char,
    pub paths: git_strarray,
}

pub const GIT_STASH_SAVE_OPTIONS_VERSION: c_uint = 1;

#[repr(C)]
pub struct git_stash_apply_options {
    pub version: c_uint,
    pub flags: u32,
    pub checkout_options: git_checkout_options,
    pub progress_cb: git_stash_apply_progress_cb,
    pub progress_payload: *mut c_void,
}

pub type git_stash_apply_progress_cb =
    Option<extern "C" fn(progress: git_stash_apply_progress_t, payload: *mut c_void) -> c_int>;

pub type git_stash_cb = Option<
    extern "C" fn(
        index: size_t,
        message: *const c_char,
        stash_id: *const git_oid,
        payload: *mut c_void,
    ) -> c_int,
>;

pub type git_packbuilder_foreach_cb =
    Option<extern "C" fn(*const c_void, size_t, *mut c_void) -> c_int>;

pub type git_odb_foreach_cb =
    Option<extern "C" fn(id: *const git_oid, payload: *mut c_void) -> c_int>;

pub type git_commit_signing_cb = Option<
    extern "C" fn(
        signature: *mut git_buf,
        signature_field: *mut git_buf,
        commit_content: *const c_char,
        payload: *mut c_void,
    ) -> c_int,
>;

pub type git_commit_create_cb = Option<
    extern "C" fn(
        *mut git_oid,
        *const git_signature,
        *const git_signature,
        *const c_char,
        *const c_char,
        *const git_tree,
        usize,
        *const git_commit,
        *mut c_void,
    ) -> c_int,
>;

pub const GIT_REBASE_NO_OPERATION: usize = usize::max_value();

#[repr(C)]
pub struct git_rebase_options {
    pub version: c_uint,
    pub quiet: c_int,
    pub inmemory: c_int,
    pub rewrite_notes_ref: *const c_char,
    pub merge_options: git_merge_options,
    pub checkout_options: git_checkout_options,
    pub commit_create_cb: git_commit_create_cb,
    pub signing_cb: git_commit_signing_cb,
    pub payload: *mut c_void,
}

git_enum! {
    pub enum git_rebase_operation_t {
        GIT_REBASE_OPERATION_PICK = 0,
        GIT_REBASE_OPERATION_REWORD,
        GIT_REBASE_OPERATION_EDIT,
        GIT_REBASE_OPERATION_SQUASH,
        GIT_REBASE_OPERATION_FIXUP,
        GIT_REBASE_OPERATION_EXEC,
    }
}

#[repr(C)]
pub struct git_rebase_operation {
    pub kind: git_rebase_operation_t,
    pub id: git_oid,
    pub exec: *const c_char,
}

#[repr(C)]
pub struct git_cherrypick_options {
    pub version: c_uint,
    pub mainline: c_uint,
    pub merge_opts: git_merge_options,
    pub checkout_opts: git_checkout_options,
}

pub type git_revert_options = git_cherrypick_options;

pub type git_apply_delta_cb =
    Option<extern "C" fn(delta: *const git_diff_delta, payload: *mut c_void) -> c_int>;

pub type git_apply_hunk_cb =
    Option<extern "C" fn(hunk: *const git_diff_hunk, payload: *mut c_void) -> c_int>;

git_enum! {
    pub enum git_apply_flags_t {
        GIT_APPLY_CHECK = 1<<0,
    }
}

#[repr(C)]
pub struct git_apply_options {
    pub version: c_uint,
    pub delta_cb: git_apply_delta_cb,
    pub hunk_cb: git_apply_hunk_cb,
    pub payload: *mut c_void,
    pub flags: u32,
}

git_enum! {
    pub enum git_apply_location_t {
        GIT_APPLY_LOCATION_WORKDIR = 0,
        GIT_APPLY_LOCATION_INDEX = 1,
        GIT_APPLY_LOCATION_BOTH = 2,
    }
}

git_enum! {
    pub enum git_libgit2_opt_t {
        GIT_OPT_GET_MWINDOW_SIZE = 0,
        GIT_OPT_SET_MWINDOW_SIZE,
        GIT_OPT_GET_MWINDOW_MAPPED_LIMIT,
        GIT_OPT_SET_MWINDOW_MAPPED_LIMIT,
        GIT_OPT_GET_SEARCH_PATH,
        GIT_OPT_SET_SEARCH_PATH,
        GIT_OPT_SET_CACHE_OBJECT_LIMIT,
        GIT_OPT_SET_CACHE_MAX_SIZE,
        GIT_OPT_ENABLE_CACHING,
        GIT_OPT_GET_CACHED_MEMORY,
        GIT_OPT_GET_TEMPLATE_PATH,
        GIT_OPT_SET_TEMPLATE_PATH,
        GIT_OPT_SET_SSL_CERT_LOCATIONS,
        GIT_OPT_SET_USER_AGENT,
        GIT_OPT_ENABLE_STRICT_OBJECT_CREATION,
        GIT_OPT_ENABLE_STRICT_SYMBOLIC_REF_CREATION,
        GIT_OPT_SET_SSL_CIPHERS,
        GIT_OPT_GET_USER_AGENT,
        GIT_OPT_ENABLE_OFS_DELTA,
        GIT_OPT_ENABLE_FSYNC_GITDIR,
        GIT_OPT_GET_WINDOWS_SHAREMODE,
        GIT_OPT_SET_WINDOWS_SHAREMODE,
        GIT_OPT_ENABLE_STRICT_HASH_VERIFICATION,
        GIT_OPT_SET_ALLOCATOR,
        GIT_OPT_ENABLE_UNSAVED_INDEX_SAFETY,
        GIT_OPT_GET_PACK_MAX_OBJECTS,
        GIT_OPT_SET_PACK_MAX_OBJECTS,
        GIT_OPT_DISABLE_PACK_KEEP_FILE_CHECKS,
        GIT_OPT_ENABLE_HTTP_EXPECT_CONTINUE,
        GIT_OPT_GET_MWINDOW_FILE_LIMIT,
        GIT_OPT_SET_MWINDOW_FILE_LIMIT,
        GIT_OPT_SET_ODB_PACKED_PRIORITY,
        GIT_OPT_SET_ODB_LOOSE_PRIORITY,
        GIT_OPT_GET_EXTENSIONS,
        GIT_OPT_SET_EXTENSIONS,
        GIT_OPT_GET_OWNER_VALIDATION,
        GIT_OPT_SET_OWNER_VALIDATION,
    }
}

git_enum! {
    pub enum git_reference_format_t {
        GIT_REFERENCE_FORMAT_NORMAL = 0,
        GIT_REFERENCE_FORMAT_ALLOW_ONELEVEL = 1 << 0,
        GIT_REFERENCE_FORMAT_REFSPEC_PATTERN = 1 << 1,
        GIT_REFERENCE_FORMAT_REFSPEC_SHORTHAND = 1 << 2,
    }
}

#[repr(C)]
pub struct git_worktree_add_options {
    pub version: c_uint,
    pub lock: c_int,
    pub reference: *mut git_reference,
    pub checkout_options: git_checkout_options,
}

pub const GIT_WORKTREE_ADD_OPTIONS_VERSION: c_uint = 1;

git_enum! {
    pub enum git_worktree_prune_t {
        /* Prune working tree even if working tree is valid */
        GIT_WORKTREE_PRUNE_VALID = 1 << 0,
        /* Prune working tree even if it is locked */
        GIT_WORKTREE_PRUNE_LOCKED = 1 << 1,
        /* Prune checked out working tree */
        GIT_WORKTREE_PRUNE_WORKING_TREE = 1 << 2,
    }
}

#[repr(C)]
pub struct git_worktree_prune_options {
    pub version: c_uint,
    pub flags: u32,
}

pub const GIT_WORKTREE_PRUNE_OPTIONS_VERSION: c_uint = 1;

pub type git_repository_mergehead_foreach_cb =
    Option<extern "C" fn(oid: *const git_oid, payload: *mut c_void) -> c_int>;

pub type git_repository_fetchhead_foreach_cb = Option<
    extern "C" fn(*const c_char, *const c_char, *const git_oid, c_uint, *mut c_void) -> c_int,
>;

git_enum! {
    pub enum git_trace_level_t {
        /* No tracing will be performed. */
        GIT_TRACE_NONE = 0,

        /* Severe errors that may impact the program's execution */
        GIT_TRACE_FATAL = 1,

        /* Errors that do not impact the program's execution */
        GIT_TRACE_ERROR = 2,

        /* Warnings that suggest abnormal data */
        GIT_TRACE_WARN = 3,

        /* Informational messages about program execution */
        GIT_TRACE_INFO = 4,

        /* Detailed data that allows for debugging */
        GIT_TRACE_DEBUG = 5,

        /* Exceptionally detailed debugging data */
        GIT_TRACE_TRACE = 6,
    }
}

pub type git_trace_cb = Option<extern "C" fn(level: git_trace_level_t, msg: *const c_char)>;

git_enum! {
    pub enum git_feature_t {
        GIT_FEATURE_THREADS = 1 << 0,
        GIT_FEATURE_HTTPS   = 1 << 1,
        GIT_FEATURE_SSH     = 1 << 2,
        GIT_FEATURE_NSEC    = 1 << 3,
    }
}

#[repr(C)]
pub struct git_message_trailer {
    pub key: *const c_char,
    pub value: *const c_char,
}

#[repr(C)]
#[derive(Copy, Clone)]
pub struct git_message_trailer_array {
    pub trailers: *mut git_message_trailer,
    pub count: size_t,
    pub _trailer_block: *mut c_char,
}

#[repr(C)]
pub struct git_email_create_options {
    pub version: c_uint,
    pub flags: u32,
    pub diff_opts: git_diff_options,
    pub diff_find_opts: git_diff_find_options,
    pub subject_prefix: *const c_char,
    pub start_number: usize,
    pub reroll_number: usize,
}

pub const GIT_EMAIL_CREATE_OPTIONS_VERSION: c_uint = 1;

git_enum! {
    pub enum git_email_create_flags_t {
        GIT_EMAIL_CREATE_DEFAULT = 0,
        GIT_EMAIL_CREATE_OMIT_NUMBERS = 1 << 0,
        GIT_EMAIL_CREATE_ALWAYS_NUMBER = 1 << 1,
        GIT_EMAIL_CREATE_NO_RENAMES = 1 << 2,
    }
}

extern "C" {
    // threads
    pub fn git_libgit2_init() -> c_int;
    pub fn git_libgit2_shutdown() -> c_int;

    // repository
    pub fn git_repository_new(out: *mut *mut git_repository) -> c_int;
    pub fn git_repository_free(repo: *mut git_repository);
    pub fn git_repository_open(repo: *mut *mut git_repository, path: *const c_char) -> c_int;
    pub fn git_repository_open_bare(repo: *mut *mut git_repository, path: *const c_char) -> c_int;
    pub fn git_repository_open_ext(
        repo: *mut *mut git_repository,
        path: *const c_char,
        flags: c_uint,
        ceiling_dirs: *const c_char,
    ) -> c_int;
    pub fn git_repository_open_from_worktree(
        repo: *mut *mut git_repository,
        worktree: *mut git_worktree,
    ) -> c_int;
    pub fn git_repository_wrap_odb(repo: *mut *mut git_repository, odb: *mut git_odb) -> c_int;
    pub fn git_repository_init(
        repo: *mut *mut git_repository,
        path: *const c_char,
        is_bare: c_uint,
    ) -> c_int;
    pub fn git_repository_init_ext(
        out: *mut *mut git_repository,
        repo_path: *const c_char,
        opts: *mut git_repository_init_options,
    ) -> c_int;
    pub fn git_repository_init_init_options(
        opts: *mut git_repository_init_options,
        version: c_uint,
    ) -> c_int;
    pub fn git_repository_get_namespace(repo: *mut git_repository) -> *const c_char;
    pub fn git_repository_set_namespace(
        repo: *mut git_repository,
        namespace: *const c_char,
    ) -> c_int;
    pub fn git_repository_head(out: *mut *mut git_reference, repo: *mut git_repository) -> c_int;
    pub fn git_repository_set_head(repo: *mut git_repository, refname: *const c_char) -> c_int;

    pub fn git_repository_head_detached(repo: *mut git_repository) -> c_int;
    pub fn git_repository_set_head_detached(
        repo: *mut git_repository,
        commitish: *const git_oid,
    ) -> c_int;
    pub fn git_repository_set_head_detached_from_annotated(
        repo: *mut git_repository,
        commitish: *const git_annotated_commit,
    ) -> c_int;
    pub fn git_repository_set_bare(repo: *mut git_repository) -> c_int;
    pub fn git_repository_is_worktree(repo: *const git_repository) -> c_int;
    pub fn git_repository_is_bare(repo: *const git_repository) -> c_int;
    pub fn git_repository_is_empty(repo: *mut git_repository) -> c_int;
    pub fn git_repository_is_shallow(repo: *mut git_repository) -> c_int;
    pub fn git_repository_path(repo: *const git_repository) -> *const c_char;
    pub fn git_repository_state(repo: *mut git_repository) -> c_int;
    pub fn git_repository_workdir(repo: *const git_repository) -> *const c_char;
    pub fn git_repository_set_workdir(
        repo: *mut git_repository,
        workdir: *const c_char,
        update_gitlink: c_int,
    ) -> c_int;
    pub fn git_repository_index(out: *mut *mut git_index, repo: *mut git_repository) -> c_int;
    pub fn git_repository_set_index(repo: *mut git_repository, index: *mut git_index) -> c_int;

    pub fn git_repository_message(buf: *mut git_buf, repo: *mut git_repository) -> c_int;

    pub fn git_repository_message_remove(repo: *mut git_repository) -> c_int;
    pub fn git_repository_config(out: *mut *mut git_config, repo: *mut git_repository) -> c_int;
    pub fn git_repository_set_config(repo: *mut git_repository, config: *mut git_config) -> c_int;
    pub fn git_repository_config_snapshot(
        out: *mut *mut git_config,
        repo: *mut git_repository,
    ) -> c_int;
    pub fn git_repository_discover(
        out: *mut git_buf,
        start_path: *const c_char,
        across_fs: c_int,
        ceiling_dirs: *const c_char,
    ) -> c_int;
    pub fn git_repository_set_odb(repo: *mut git_repository, odb: *mut git_odb) -> c_int;

    pub fn git_repository_refdb(out: *mut *mut git_refdb, repo: *mut git_repository) -> c_int;
    pub fn git_repository_set_refdb(repo: *mut git_repository, refdb: *mut git_refdb) -> c_int;

    pub fn git_repository_reinit_filesystem(
        repo: *mut git_repository,
        recurse_submodules: c_int,
    ) -> c_int;
    pub fn git_repository_mergehead_foreach(
        repo: *mut git_repository,
        callback: git_repository_mergehead_foreach_cb,
        payload: *mut c_void,
    ) -> c_int;
    pub fn git_repository_fetchhead_foreach(
        repo: *mut git_repository,
        callback: git_repository_fetchhead_foreach_cb,
        payload: *mut c_void,
    ) -> c_int;
    pub fn git_ignore_add_rule(repo: *mut git_repository, rules: *const c_char) -> c_int;
    pub fn git_ignore_clear_internal_rules(repo: *mut git_repository) -> c_int;
    pub fn git_ignore_path_is_ignored(
        ignored: *mut c_int,
        repo: *mut git_repository,
        path: *const c_char,
    ) -> c_int;

    // revparse
    pub fn git_revparse(
        revspec: *mut git_revspec,
        repo: *mut git_repository,
        spec: *const c_char,
    ) -> c_int;
    pub fn git_revparse_single(
        out: *mut *mut git_object,
        repo: *mut git_repository,
        spec: *const c_char,
    ) -> c_int;
    pub fn git_revparse_ext(
        object_out: *mut *mut git_object,
        reference_out: *mut *mut git_reference,
        repo: *mut git_repository,
        spec: *const c_char,
    ) -> c_int;

    // object
    pub fn git_object_dup(dest: *mut *mut git_object, source: *mut git_object) -> c_int;
    pub fn git_object_id(obj: *const git_object) -> *const git_oid;
    pub fn git_object_free(object: *mut git_object);
    pub fn git_object_lookup(
        dest: *mut *mut git_object,
        repo: *mut git_repository,
        id: *const git_oid,
        kind: git_object_t,
    ) -> c_int;
    pub fn git_object_lookup_prefix(
        dest: *mut *mut git_object,
        repo: *mut git_repository,
        id: *const git_oid,
        len: size_t,
        kind: git_object_t,
    ) -> c_int;
    pub fn git_object_type(obj: *const git_object) -> git_object_t;
    pub fn git_object_peel(
        peeled: *mut *mut git_object,
        object: *const git_object,
        target_type: git_object_t,
    ) -> c_int;
    pub fn git_object_short_id(out: *mut git_buf, obj: *const git_object) -> c_int;
    pub fn git_object_type2string(kind: git_object_t) -> *const c_char;
    pub fn git_object_string2type(s: *const c_char) -> git_object_t;
    pub fn git_object_typeisloose(kind: git_object_t) -> c_int;

    // oid
    pub fn git_oid_fromraw(out: *mut git_oid, raw: *const c_uchar) -> c_int;
    pub fn git_oid_fromstrn(out: *mut git_oid, str: *const c_char, len: size_t) -> c_int;
    pub fn git_oid_tostr(out: *mut c_char, n: size_t, id: *const git_oid) -> *mut c_char;
    pub fn git_oid_cmp(a: *const git_oid, b: *const git_oid) -> c_int;
    pub fn git_oid_equal(a: *const git_oid, b: *const git_oid) -> c_int;
    pub fn git_oid_streq(id: *const git_oid, str: *const c_char) -> c_int;
    pub fn git_oid_iszero(id: *const git_oid) -> c_int;

    // error
    pub fn git_error_last() -> *const git_error;
    pub fn git_error_clear();
    pub fn git_error_set_str(error_class: c_int, string: *const c_char) -> c_int;

    // remote
    pub fn git_remote_create(
        out: *mut *mut git_remote,
        repo: *mut git_repository,
        name: *const c_char,
        url: *const c_char,
    ) -> c_int;
    pub fn git_remote_create_with_fetchspec(
        out: *mut *mut git_remote,
        repo: *mut git_repository,
        name: *const c_char,
        url: *const c_char,
        fetch: *const c_char,
    ) -> c_int;
    pub fn git_remote_lookup(
        out: *mut *mut git_remote,
        repo: *mut git_repository,
        name: *const c_char,
    ) -> c_int;
    pub fn git_remote_create_anonymous(
        out: *mut *mut git_remote,
        repo: *mut git_repository,
        url: *const c_char,
    ) -> c_int;
    pub fn git_remote_create_detached(out: *mut *mut git_remote, url: *const c_char) -> c_int;
    pub fn git_remote_delete(repo: *mut git_repository, name: *const c_char) -> c_int;
    pub fn git_remote_free(remote: *mut git_remote);
    pub fn git_remote_name(remote: *const git_remote) -> *const c_char;
    pub fn git_remote_pushurl(remote: *const git_remote) -> *const c_char;
    pub fn git_remote_refspec_count(remote: *const git_remote) -> size_t;
    pub fn git_remote_url(remote: *const git_remote) -> *const c_char;
    pub fn git_remote_connect(
        remote: *mut git_remote,
        dir: git_direction,
        callbacks: *const git_remote_callbacks,
        proxy_opts: *const git_proxy_options,
        custom_headers: *const git_strarray,
    ) -> c_int;
    pub fn git_remote_connected(remote: *const git_remote) -> c_int;
    pub fn git_remote_disconnect(remote: *mut git_remote) -> c_int;
    pub fn git_remote_add_fetch(
        repo: *mut git_repository,
        remote: *const c_char,
        refspec: *const c_char,
    ) -> c_int;
    pub fn git_remote_add_push(
        repo: *mut git_repository,
        remote: *const c_char,
        refspec: *const c_char,
    ) -> c_int;
    pub fn git_remote_download(
        remote: *mut git_remote,
        refspecs: *const git_strarray,
        opts: *const git_fetch_options,
    ) -> c_int;
    pub fn git_remote_stop(remote: *mut git_remote) -> c_int;
    pub fn git_remote_dup(dest: *mut *mut git_remote, source: *mut git_remote) -> c_int;
    pub fn git_remote_get_fetch_refspecs(
        array: *mut git_strarray,
        remote: *const git_remote,
    ) -> c_int;
    pub fn git_remote_get_push_refspecs(
        array: *mut git_strarray,
        remote: *const git_remote,
    ) -> c_int;
    pub fn git_remote_get_refspec(remote: *const git_remote, n: size_t) -> *const git_refspec;
    pub fn git_remote_is_valid_name(remote_name: *const c_char) -> c_int;
    pub fn git_remote_name_is_valid(valid: *mut c_int, remote_name: *const c_char) -> c_int;
    pub fn git_remote_list(out: *mut git_strarray, repo: *mut git_repository) -> c_int;
    pub fn git_remote_rename(
        problems: *mut git_strarray,
        repo: *mut git_repository,
        name: *const c_char,
        new_name: *const c_char,
    ) -> c_int;
    pub fn git_remote_fetch(
        remote: *mut git_remote,
        refspecs: *const git_strarray,
        opts: *const git_fetch_options,
        reflog_message: *const c_char,
    ) -> c_int;
    pub fn git_remote_push(
        remote: *mut git_remote,
        refspecs: *const git_strarray,
        opts: *const git_push_options,
    ) -> c_int;
    pub fn git_remote_update_tips(
        remote: *mut git_remote,
        callbacks: *const git_remote_callbacks,
        update_fetchead: c_int,
        download_tags: git_remote_autotag_option_t,
        reflog_message: *const c_char,
    ) -> c_int;
    pub fn git_remote_set_url(
        repo: *mut git_repository,
        remote: *const c_char,
        url: *const c_char,
    ) -> c_int;
    pub fn git_remote_set_pushurl(
        repo: *mut git_repository,
        remote: *const c_char,
        pushurl: *const c_char,
    ) -> c_int;
    pub fn git_remote_init_callbacks(opts: *mut git_remote_callbacks, version: c_uint) -> c_int;
    pub fn git_fetch_init_options(opts: *mut git_fetch_options, version: c_uint) -> c_int;
    pub fn git_remote_stats(remote: *mut git_remote) -> *const git_indexer_progress;
    pub fn git_remote_ls(
        out: *mut *mut *const git_remote_head,
        size: *mut size_t,
        remote: *mut git_remote,
    ) -> c_int;
    pub fn git_remote_set_autotag(
        repo: *mut git_repository,
        remote: *const c_char,
        value: git_remote_autotag_option_t,
    ) -> c_int;
    pub fn git_remote_prune(
        remote: *mut git_remote,
        callbacks: *const git_remote_callbacks,
    ) -> c_int;
    pub fn git_remote_default_branch(out: *mut git_buf, remote: *mut git_remote) -> c_int;

    // refspec
    pub fn git_refspec_direction(spec: *const git_refspec) -> git_direction;
    pub fn git_refspec_dst(spec: *const git_refspec) -> *const c_char;
    pub fn git_refspec_dst_matches(spec: *const git_refspec, refname: *const c_char) -> c_int;
    pub fn git_refspec_src(spec: *const git_refspec) -> *const c_char;
    pub fn git_refspec_src_matches(spec: *const git_refspec, refname: *const c_char) -> c_int;
    pub fn git_refspec_force(spec: *const git_refspec) -> c_int;
    pub fn git_refspec_string(spec: *const git_refspec) -> *const c_char;
    pub fn git_refspec_transform(
        out: *mut git_buf,
        spec: *const git_refspec,
        name: *const c_char,
    ) -> c_int;
    pub fn git_refspec_rtransform(
        out: *mut git_buf,
        spec: *const git_refspec,
        name: *const c_char,
    ) -> c_int;

    // strarray
    pub fn git_strarray_free(array: *mut git_strarray);

    // oidarray
    pub fn git_oidarray_free(array: *mut git_oidarray);

    // signature
    pub fn git_signature_default(out: *mut *mut git_signature, repo: *mut git_repository) -> c_int;
    pub fn git_signature_free(sig: *mut git_signature);
    pub fn git_signature_new(
        out: *mut *mut git_signature,
        name: *const c_char,
        email: *const c_char,
        time: git_time_t,
        offset: c_int,
    ) -> c_int;
    pub fn git_signature_now(
        out: *mut *mut git_signature,
        name: *const c_char,
        email: *const c_char,
    ) -> c_int;
    pub fn git_signature_dup(dest: *mut *mut git_signature, sig: *const git_signature) -> c_int;

    // status
    pub fn git_status_list_new(
        out: *mut *mut git_status_list,
        repo: *mut git_repository,
        options: *const git_status_options,
    ) -> c_int;
    pub fn git_status_list_entrycount(list: *mut git_status_list) -> size_t;
    pub fn git_status_byindex(
        statuslist: *mut git_status_list,
        idx: size_t,
    ) -> *const git_status_entry;
    pub fn git_status_list_free(list: *mut git_status_list);
    pub fn git_status_init_options(opts: *mut git_status_options, version: c_uint) -> c_int;
    pub fn git_status_file(
        status_flags: *mut c_uint,
        repo: *mut git_repository,
        path: *const c_char,
    ) -> c_int;
    pub fn git_status_should_ignore(
        ignored: *mut c_int,
        repo: *mut git_repository,
        path: *const c_char,
    ) -> c_int;

    // clone
    pub fn git_clone(
        out: *mut *mut git_repository,
        url: *const c_char,
        local_path: *const c_char,
        options: *const git_clone_options,
    ) -> c_int;
    pub fn git_clone_init_options(opts: *mut git_clone_options, version: c_uint) -> c_int;

    // reset
    pub fn git_reset(
        repo: *mut git_repository,
        target: *const git_object,
        reset_type: git_reset_t,
        checkout_opts: *const git_checkout_options,
    ) -> c_int;
    pub fn git_reset_default(
        repo: *mut git_repository,
        target: *const git_object,
        pathspecs: *const git_strarray,
    ) -> c_int;

    // reference
    pub fn git_reference_cmp(ref1: *const git_reference, ref2: *const git_reference) -> c_int;
    pub fn git_reference_delete(r: *mut git_reference) -> c_int;
    pub fn git_reference_free(r: *mut git_reference);
    pub fn git_reference_is_branch(r: *const git_reference) -> c_int;
    pub fn git_reference_is_note(r: *const git_reference) -> c_int;
    pub fn git_reference_is_remote(r: *const git_reference) -> c_int;
    pub fn git_reference_is_tag(r: *const git_reference) -> c_int;
    pub fn git_reference_is_valid_name(name: *const c_char) -> c_int;
    pub fn git_reference_name_is_valid(valid: *mut c_int, refname: *const c_char) -> c_int;
    pub fn git_reference_lookup(
        out: *mut *mut git_reference,
        repo: *mut git_repository,
        name: *const c_char,
    ) -> c_int;
    pub fn git_reference_dwim(
        out: *mut *mut git_reference,
        repo: *mut git_repository,
        refname: *const c_char,
    ) -> c_int;
    pub fn git_reference_name(r: *const git_reference) -> *const c_char;
    pub fn git_reference_name_to_id(
        out: *mut git_oid,
        repo: *mut git_repository,
        name: *const c_char,
    ) -> c_int;
    pub fn git_reference_peel(
        out: *mut *mut git_object,
        r: *const git_reference,
        otype: git_object_t,
    ) -> c_int;
    pub fn git_reference_rename(
        new_ref: *mut *mut git_reference,
        r: *mut git_reference,
        new_name: *const c_char,
        force: c_int,
        log_message: *const c_char,
    ) -> c_int;
    pub fn git_reference_resolve(out: *mut *mut git_reference, r: *const git_reference) -> c_int;
    pub fn git_reference_shorthand(r: *const git_reference) -> *const c_char;
    pub fn git_reference_symbolic_target(r: *const git_reference) -> *const c_char;
    pub fn git_reference_target(r: *const git_reference) -> *const git_oid;
    pub fn git_reference_target_peel(r: *const git_reference) -> *const git_oid;
    pub fn git_reference_set_target(
        out: *mut *mut git_reference,
        r: *mut git_reference,
        id: *const git_oid,
        log_message: *const c_char,
    ) -> c_int;
    pub fn git_reference_symbolic_set_target(
        out: *mut *mut git_reference,
        r: *mut git_reference,
        target: *const c_char,
        log_message: *const c_char,
    ) -> c_int;
    pub fn git_reference_type(r: *const git_reference) -> git_reference_t;
    pub fn git_reference_iterator_new(
        out: *mut *mut git_reference_iterator,
        repo: *mut git_repository,
    ) -> c_int;
    pub fn git_reference_iterator_glob_new(
        out: *mut *mut git_reference_iterator,
        repo: *mut git_repository,
        glob: *const c_char,
    ) -> c_int;
    pub fn git_reference_iterator_free(iter: *mut git_reference_iterator);
    pub fn git_reference_next(
        out: *mut *mut git_reference,
        iter: *mut git_reference_iterator,
    ) -> c_int;
    pub fn git_reference_next_name(
        out: *mut *const c_char,
        iter: *mut git_reference_iterator,
    ) -> c_int;
    pub fn git_reference_create(
        out: *mut *mut git_reference,
        repo: *mut git_repository,
        name: *const c_char,
        id: *const git_oid,
        force: c_int,
        log_message: *const c_char,
    ) -> c_int;
    pub fn git_reference_symbolic_create(
        out: *mut *mut git_reference,
        repo: *mut git_repository,
        name: *const c_char,
        target: *const c_char,
        force: c_int,
        log_message: *const c_char,
    ) -> c_int;
    pub fn git_reference_create_matching(
        out: *mut *mut git_reference,
        repo: *mut git_repository,
        name: *const c_char,
        id: *const git_oid,
        force: c_int,
        current_id: *const git_oid,
        log_message: *const c_char,
    ) -> c_int;
    pub fn git_reference_symbolic_create_matching(
        out: *mut *mut git_reference,
        repo: *mut git_repository,
        name: *const c_char,
        target: *const c_char,
        force: c_int,
        current_id: *const c_char,
        log_message: *const c_char,
    ) -> c_int;
    pub fn git_reference_has_log(repo: *mut git_repository, name: *const c_char) -> c_int;
    pub fn git_reference_ensure_log(repo: *mut git_repository, name: *const c_char) -> c_int;
    pub fn git_reference_normalize_name(
        buffer_out: *mut c_char,
        buffer_size: size_t,
        name: *const c_char,
        flags: u32,
    ) -> c_int;

    // stash
    pub fn git_stash_save(
        out: *mut git_oid,
        repo: *mut git_repository,
        stasher: *const git_signature,
        message: *const c_char,
        flags: c_uint,
    ) -> c_int;

    pub fn git_stash_save_options_init(opts: *mut git_stash_save_options, version: c_uint)
        -> c_int;

    pub fn git_stash_save_with_opts(
        out: *mut git_oid,
        repo: *mut git_repository,
        options: *const git_stash_save_options,
    ) -> c_int;

    pub fn git_stash_apply_init_options(
        opts: *mut git_stash_apply_options,
        version: c_uint,
    ) -> c_int;

    pub fn git_stash_apply(
        repo: *mut git_repository,
        index: size_t,
        options: *const git_stash_apply_options,
    ) -> c_int;

    pub fn git_stash_foreach(
        repo: *mut git_repository,
        callback: git_stash_cb,
        payload: *mut c_void,
    ) -> c_int;

    pub fn git_stash_drop(repo: *mut git_repository, index: size_t) -> c_int;

    pub fn git_stash_pop(
        repo: *mut git_repository,
        index: size_t,
        options: *const git_stash_apply_options,
    ) -> c_int;

    // submodules
    pub fn git_submodule_add_finalize(submodule: *mut git_submodule) -> c_int;
    pub fn git_submodule_add_setup(
        submodule: *mut *mut git_submodule,
        repo: *mut git_repository,
        url: *const c_char,
        path: *const c_char,
        use_gitlink: c_int,
    ) -> c_int;
    pub fn git_submodule_add_to_index(submodule: *mut git_submodule, write_index: c_int) -> c_int;
    pub fn git_submodule_branch(submodule: *mut git_submodule) -> *const c_char;
    pub fn git_submodule_clone(
        repo: *mut *mut git_repository,
        submodule: *mut git_submodule,
        opts: *const git_submodule_update_options,
    ) -> c_int;
    pub fn git_submodule_foreach(
        repo: *mut git_repository,
        callback: git_submodule_cb,
        payload: *mut c_void,
    ) -> c_int;
    pub fn git_submodule_free(submodule: *mut git_submodule);
    pub fn git_submodule_head_id(submodule: *mut git_submodule) -> *const git_oid;
    pub fn git_submodule_ignore(submodule: *mut git_submodule) -> git_submodule_ignore_t;
    pub fn git_submodule_index_id(submodule: *mut git_submodule) -> *const git_oid;
    pub fn git_submodule_init(submodule: *mut git_submodule, overwrite: c_int) -> c_int;
    pub fn git_submodule_repo_init(
        repo: *mut *mut git_repository,
        submodule: *const git_submodule,
        use_gitlink: c_int,
    ) -> c_int;
    pub fn git_submodule_location(status: *mut c_uint, submodule: *mut git_submodule) -> c_int;
    pub fn git_submodule_lookup(
        out: *mut *mut git_submodule,
        repo: *mut git_repository,
        name: *const c_char,
    ) -> c_int;
    pub fn git_submodule_name(submodule: *mut git_submodule) -> *const c_char;
    pub fn git_submodule_open(
        repo: *mut *mut git_repository,
        submodule: *mut git_submodule,
    ) -> c_int;
    pub fn git_submodule_path(submodule: *mut git_submodule) -> *const c_char;
    pub fn git_submodule_reload(submodule: *mut git_submodule, force: c_int) -> c_int;
    pub fn git_submodule_set_ignore(
        repo: *mut git_repository,
        name: *const c_char,
        ignore: git_submodule_ignore_t,
    ) -> c_int;
    pub fn git_submodule_set_update(
        repo: *mut git_repository,
        name: *const c_char,
        update: git_submodule_update_t,
    ) -> c_int;
    pub fn git_submodule_set_url(
        repo: *mut git_repository,
        name: *const c_char,
        url: *const c_char,
    ) -> c_int;
    pub fn git_submodule_sync(submodule: *mut git_submodule) -> c_int;
    pub fn git_submodule_update_strategy(submodule: *mut git_submodule) -> git_submodule_update_t;
    pub fn git_submodule_update(
        submodule: *mut git_submodule,
        init: c_int,
        options: *mut git_submodule_update_options,
    ) -> c_int;
    pub fn git_submodule_update_init_options(
        options: *mut git_submodule_update_options,
        version: c_uint,
    ) -> c_int;
    pub fn git_submodule_url(submodule: *mut git_submodule) -> *const c_char;
    pub fn git_submodule_wd_id(submodule: *mut git_submodule) -> *const git_oid;
    pub fn git_submodule_status(
        status: *mut c_uint,
        repo: *mut git_repository,
        name: *const c_char,
        ignore: git_submodule_ignore_t,
    ) -> c_int;
    pub fn git_submodule_set_branch(
        repo: *mut git_repository,
        name: *const c_char,
        branch: *const c_char,
    ) -> c_int;

    // blob
    pub fn git_blob_free(blob: *mut git_blob);
    pub fn git_blob_id(blob: *const git_blob) -> *const git_oid;
    pub fn git_blob_is_binary(blob: *const git_blob) -> c_int;
    pub fn git_blob_lookup(
        blob: *mut *mut git_blob,
        repo: *mut git_repository,
        id: *const git_oid,
    ) -> c_int;
    pub fn git_blob_lookup_prefix(
        blob: *mut *mut git_blob,
        repo: *mut git_repository,
        id: *const git_oid,
        len: size_t,
    ) -> c_int;
    pub fn git_blob_rawcontent(blob: *const git_blob) -> *const c_void;
    pub fn git_blob_rawsize(blob: *const git_blob) -> git_object_size_t;
    pub fn git_blob_create_frombuffer(
        id: *mut git_oid,
        repo: *mut git_repository,
        buffer: *const c_void,
        len: size_t,
    ) -> c_int;
    pub fn git_blob_create_fromdisk(
        id: *mut git_oid,
        repo: *mut git_repository,
        path: *const c_char,
    ) -> c_int;
    pub fn git_blob_create_fromworkdir(
        id: *mut git_oid,
        repo: *mut git_repository,
        relative_path: *const c_char,
    ) -> c_int;
    pub fn git_blob_create_fromstream(
        out: *mut *mut git_writestream,
        repo: *mut git_repository,
        hintpath: *const c_char,
    ) -> c_int;
    pub fn git_blob_create_fromstream_commit(
        id: *mut git_oid,
        stream: *mut git_writestream,
    ) -> c_int;

    // tree
    pub fn git_tree_entry_byid(tree: *const git_tree, id: *const git_oid) -> *const git_tree_entry;
    pub fn git_tree_entry_byindex(tree: *const git_tree, idx: size_t) -> *const git_tree_entry;
    pub fn git_tree_entry_byname(
        tree: *const git_tree,
        filename: *const c_char,
    ) -> *const git_tree_entry;
    pub fn git_tree_entry_bypath(
        out: *mut *mut git_tree_entry,
        tree: *const git_tree,
        filename: *const c_char,
    ) -> c_int;
    pub fn git_tree_entry_cmp(e1: *const git_tree_entry, e2: *const git_tree_entry) -> c_int;
    pub fn git_tree_entry_dup(dest: *mut *mut git_tree_entry, src: *const git_tree_entry) -> c_int;
    pub fn git_tree_entry_filemode(entry: *const git_tree_entry) -> git_filemode_t;
    pub fn git_tree_entry_filemode_raw(entry: *const git_tree_entry) -> git_filemode_t;
    pub fn git_tree_entry_free(entry: *mut git_tree_entry);
    pub fn git_tree_entry_id(entry: *const git_tree_entry) -> *const git_oid;
    pub fn git_tree_entry_name(entry: *const git_tree_entry) -> *const c_char;
    pub fn git_tree_entry_to_object(
        out: *mut *mut git_object,
        repo: *mut git_repository,
        entry: *const git_tree_entry,
    ) -> c_int;
    pub fn git_tree_entry_type(entry: *const git_tree_entry) -> git_object_t;
    pub fn git_tree_entrycount(tree: *const git_tree) -> size_t;
    pub fn git_tree_free(tree: *mut git_tree);
    pub fn git_tree_id(tree: *const git_tree) -> *const git_oid;
    pub fn git_tree_lookup(
        tree: *mut *mut git_tree,
        repo: *mut git_repository,
        id: *const git_oid,
    ) -> c_int;
    pub fn git_tree_walk(
        tree: *const git_tree,
        mode: git_treewalk_mode,
        callback: git_treewalk_cb,
        payload: *mut c_void,
    ) -> c_int;
    pub fn git_tree_create_updated(
        out: *mut git_oid,
        repo: *mut git_repository,
        baseline: *mut git_tree,
        nupdates: usize,
        updates: *const git_tree_update,
    ) -> c_int;

    // treebuilder
    pub fn git_treebuilder_new(
        out: *mut *mut git_treebuilder,
        repo: *mut git_repository,
        source: *const git_tree,
    ) -> c_int;
    pub fn git_treebuilder_clear(bld: *mut git_treebuilder) -> c_int;
    pub fn git_treebuilder_entrycount(bld: *mut git_treebuilder) -> size_t;
    pub fn git_treebuilder_free(bld: *mut git_treebuilder);
    pub fn git_treebuilder_get(
        bld: *mut git_treebuilder,
        filename: *const c_char,
    ) -> *const git_tree_entry;
    pub fn git_treebuilder_insert(
        out: *mut *const git_tree_entry,
        bld: *mut git_treebuilder,
        filename: *const c_char,
        id: *const git_oid,
        filemode: git_filemode_t,
    ) -> c_int;
    pub fn git_treebuilder_remove(bld: *mut git_treebuilder, filename: *const c_char) -> c_int;
    pub fn git_treebuilder_filter(
        bld: *mut git_treebuilder,
        filter: git_treebuilder_filter_cb,
        payload: *mut c_void,
    ) -> c_int;
    pub fn git_treebuilder_write(id: *mut git_oid, bld: *mut git_treebuilder) -> c_int;

    // buf
    pub fn git_buf_dispose(buffer: *mut git_buf);
    pub fn git_buf_grow(buffer: *mut git_buf, target_size: size_t) -> c_int;
    pub fn git_buf_set(buffer: *mut git_buf, data: *const c_void, datalen: size_t) -> c_int;

    // commit
    pub fn git_commit_author(commit: *const git_commit) -> *const git_signature;
    pub fn git_commit_author_with_mailmap(
        out: *mut *mut git_signature,
        commit: *const git_commit,
        mailmap: *const git_mailmap,
    ) -> c_int;
    pub fn git_commit_committer(commit: *const git_commit) -> *const git_signature;
    pub fn git_commit_committer_with_mailmap(
        out: *mut *mut git_signature,
        commit: *const git_commit,
        mailmap: *const git_mailmap,
    ) -> c_int;
    pub fn git_commit_free(commit: *mut git_commit);
    pub fn git_commit_id(commit: *const git_commit) -> *const git_oid;
    pub fn git_commit_lookup(
        commit: *mut *mut git_commit,
        repo: *mut git_repository,
        id: *const git_oid,
    ) -> c_int;
    pub fn git_commit_lookup_prefix(
        commit: *mut *mut git_commit,
        repo: *mut git_repository,
        id: *const git_oid,
        len: size_t,
    ) -> c_int;
    pub fn git_commit_message(commit: *const git_commit) -> *const c_char;
    pub fn git_commit_message_encoding(commit: *const git_commit) -> *const c_char;
    pub fn git_commit_message_raw(commit: *const git_commit) -> *const c_char;
    pub fn git_commit_nth_gen_ancestor(
        commit: *mut *mut git_commit,
        commit: *const git_commit,
        n: c_uint,
    ) -> c_int;
    pub fn git_commit_parent(
        out: *mut *mut git_commit,
        commit: *const git_commit,
        n: c_uint,
    ) -> c_int;
    pub fn git_commit_parent_id(commit: *const git_commit, n: c_uint) -> *const git_oid;
    pub fn git_commit_parentcount(commit: *const git_commit) -> c_uint;
    pub fn git_commit_raw_header(commit: *const git_commit) -> *const c_char;
    pub fn git_commit_summary(commit: *mut git_commit) -> *const c_char;
    pub fn git_commit_body(commit: *mut git_commit) -> *const c_char;
    pub fn git_commit_time(commit: *const git_commit) -> git_time_t;
    pub fn git_commit_time_offset(commit: *const git_commit) -> c_int;
    pub fn git_commit_tree(tree_out: *mut *mut git_tree, commit: *const git_commit) -> c_int;
    pub fn git_commit_tree_id(commit: *const git_commit) -> *const git_oid;
    pub fn git_commit_amend(
        id: *mut git_oid,
        commit_to_amend: *const git_commit,
        update_ref: *const c_char,
        author: *const git_signature,
        committer: *const git_signature,
        message_encoding: *const c_char,
        message: *const c_char,
        tree: *const git_tree,
    ) -> c_int;
    pub fn git_commit_create(
        id: *mut git_oid,
        repo: *mut git_repository,
        update_ref: *const c_char,
        author: *const git_signature,
        committer: *const git_signature,
        message_encoding: *const c_char,
        message: *const c_char,
        tree: *const git_tree,
        parent_count: size_t,
        parents: *mut *const git_commit,
    ) -> c_int;
    pub fn git_commit_create_buffer(
        out: *mut git_buf,
        repo: *mut git_repository,
        author: *const git_signature,
        committer: *const git_signature,
        message_encoding: *const c_char,
        message: *const c_char,
        tree: *const git_tree,
        parent_count: size_t,
        parents: *mut *const git_commit,
    ) -> c_int;
    pub fn git_commit_header_field(
        out: *mut git_buf,
        commit: *const git_commit,
        field: *const c_char,
    ) -> c_int;
    pub fn git_annotated_commit_lookup(
        out: *mut *mut git_annotated_commit,
        repo: *mut git_repository,
        id: *const git_oid,
    ) -> c_int;
    pub fn git_commit_create_with_signature(
        id: *mut git_oid,
        repo: *mut git_repository,
        commit_content: *const c_char,
        signature: *const c_char,
        signature_field: *const c_char,
    ) -> c_int;
    pub fn git_commit_extract_signature(
        signature: *mut git_buf,
        signed_data: *mut git_buf,
        repo: *mut git_repository,
        commit_id: *mut git_oid,
        field: *const c_char,
    ) -> c_int;

    // branch
    pub fn git_branch_create(
        out: *mut *mut git_reference,
        repo: *mut git_repository,
        branch_name: *const c_char,
        target: *const git_commit,
        force: c_int,
    ) -> c_int;
    pub fn git_branch_create_from_annotated(
        ref_out: *mut *mut git_reference,
        repository: *mut git_repository,
        branch_name: *const c_char,
        commit: *const git_annotated_commit,
        force: c_int,
    ) -> c_int;
    pub fn git_branch_delete(branch: *mut git_reference) -> c_int;
    pub fn git_branch_is_head(branch: *const git_reference) -> c_int;
    pub fn git_branch_iterator_free(iter: *mut git_branch_iterator);
    pub fn git_branch_iterator_new(
        iter: *mut *mut git_branch_iterator,
        repo: *mut git_repository,
        list_flags: git_branch_t,
    ) -> c_int;
    pub fn git_branch_lookup(
        out: *mut *mut git_reference,
        repo: *mut git_repository,
        branch_name: *const c_char,
        branch_type: git_branch_t,
    ) -> c_int;
    pub fn git_branch_move(
        out: *mut *mut git_reference,
        branch: *mut git_reference,
        new_branch_name: *const c_char,
        force: c_int,
    ) -> c_int;
    pub fn git_branch_name(out: *mut *const c_char, branch: *const git_reference) -> c_int;
    pub fn git_branch_name_is_valid(valid: *mut c_int, name: *const c_char) -> c_int;
    pub fn git_branch_remote_name(
        out: *mut git_buf,
        repo: *mut git_repository,
        refname: *const c_char,
    ) -> c_int;
    pub fn git_branch_next(
        out: *mut *mut git_reference,
        out_type: *mut git_branch_t,
        iter: *mut git_branch_iterator,
    ) -> c_int;
    pub fn git_branch_set_upstream(
        branch: *mut git_reference,
        upstream_name: *const c_char,
    ) -> c_int;
    pub fn git_branch_upstream(out: *mut *mut git_reference, branch: *const git_reference)
        -> c_int;
    pub fn git_branch_upstream_name(
        out: *mut git_buf,
        repo: *mut git_repository,
        refname: *const c_char,
    ) -> c_int;
    pub fn git_branch_upstream_remote(
        out: *mut git_buf,
        repo: *mut git_repository,
        refname: *const c_char,
    ) -> c_int;

    // index
    pub fn git_index_version(index: *mut git_index) -> c_uint;
    pub fn git_index_set_version(index: *mut git_index, version: c_uint) -> c_int;
    pub fn git_index_add(index: *mut git_index, entry: *const git_index_entry) -> c_int;
    pub fn git_index_add_all(
        index: *mut git_index,
        pathspec: *const git_strarray,
        flags: c_uint,
        callback: git_index_matched_path_cb,
        payload: *mut c_void,
    ) -> c_int;
    pub fn git_index_add_bypath(index: *mut git_index, path: *const c_char) -> c_int;
    pub fn git_index_add_frombuffer(
        index: *mut git_index,
        entry: *const git_index_entry,
        buffer: *const c_void,
        len: size_t,
    ) -> c_int;
    pub fn git_index_conflict_add(
        index: *mut git_index,
        ancestor_entry: *const git_index_entry,
        our_entry: *const git_index_entry,
        their_entry: *const git_index_entry,
    ) -> c_int;
    pub fn git_index_conflict_remove(index: *mut git_index, path: *const c_char) -> c_int;
    pub fn git_index_conflict_get(
        ancestor_out: *mut *const git_index_entry,
        our_out: *mut *const git_index_entry,
        their_out: *mut *const git_index_entry,
        index: *mut git_index,
        path: *const c_char,
    ) -> c_int;
    pub fn git_index_conflict_iterator_new(
        iter: *mut *mut git_index_conflict_iterator,
        index: *mut git_index,
    ) -> c_int;
    pub fn git_index_conflict_next(
        ancestor_out: *mut *const git_index_entry,
        our_out: *mut *const git_index_entry,
        their_out: *mut *const git_index_entry,
        iter: *mut git_index_conflict_iterator,
    ) -> c_int;
    pub fn git_index_conflict_iterator_free(iter: *mut git_index_conflict_iterator);
    pub fn git_index_clear(index: *mut git_index) -> c_int;
    pub fn git_index_entry_stage(entry: *const git_index_entry) -> c_int;
    pub fn git_index_entrycount(entry: *const git_index) -> size_t;
    pub fn git_index_find(at_pos: *mut size_t, index: *mut git_index, path: *const c_char)
        -> c_int;
    pub fn git_index_find_prefix(
        at_pos: *mut size_t,
        index: *mut git_index,
        prefix: *const c_char,
    ) -> c_int;
    pub fn git_index_free(index: *mut git_index);
    pub fn git_index_get_byindex(index: *mut git_index, n: size_t) -> *const git_index_entry;
    pub fn git_index_get_bypath(
        index: *mut git_index,
        path: *const c_char,
        stage: c_int,
    ) -> *const git_index_entry;
    pub fn git_index_has_conflicts(index: *const git_index) -> c_int;
    pub fn git_index_new(index: *mut *mut git_index) -> c_int;
    pub fn git_index_open(index: *mut *mut git_index, index_path: *const c_char) -> c_int;
    pub fn git_index_path(index: *const git_index) -> *const c_char;
    pub fn git_index_read(index: *mut git_index, force: c_int) -> c_int;
    pub fn git_index_read_tree(index: *mut git_index, tree: *const git_tree) -> c_int;
    pub fn git_index_remove(index: *mut git_index, path: *const c_char, stage: c_int) -> c_int;
    pub fn git_index_remove_all(
        index: *mut git_index,
        pathspec: *const git_strarray,
        callback: git_index_matched_path_cb,
        payload: *mut c_void,
    ) -> c_int;
    pub fn git_index_remove_bypath(index: *mut git_index, path: *const c_char) -> c_int;
    pub fn git_index_remove_directory(
        index: *mut git_index,
        dir: *const c_char,
        stage: c_int,
    ) -> c_int;
    pub fn git_index_update_all(
        index: *mut git_index,
        pathspec: *const git_strarray,
        callback: git_index_matched_path_cb,
        payload: *mut c_void,
    ) -> c_int;
    pub fn git_index_write(index: *mut git_index) -> c_int;
    pub fn git_index_write_tree(out: *mut git_oid, index: *mut git_index) -> c_int;
    pub fn git_index_write_tree_to(
        out: *mut git_oid,
        index: *mut git_index,
        repo: *mut git_repository,
    ) -> c_int;

    // config
    pub fn git_config_add_file_ondisk(
        cfg: *mut git_config,
        path: *const c_char,
        level: git_config_level_t,
        repo: *const git_repository,
        force: c_int,
    ) -> c_int;
    pub fn git_config_delete_entry(cfg: *mut git_config, name: *const c_char) -> c_int;
    pub fn git_config_delete_multivar(
        cfg: *mut git_config,
        name: *const c_char,
        regexp: *const c_char,
    ) -> c_int;
    pub fn git_config_find_programdata(out: *mut git_buf) -> c_int;
    pub fn git_config_find_global(out: *mut git_buf) -> c_int;
    pub fn git_config_find_system(out: *mut git_buf) -> c_int;
    pub fn git_config_find_xdg(out: *mut git_buf) -> c_int;
    pub fn git_config_free(cfg: *mut git_config);
    pub fn git_config_get_bool(
        out: *mut c_int,
        cfg: *const git_config,
        name: *const c_char,
    ) -> c_int;
    pub fn git_config_get_entry(
        out: *mut *mut git_config_entry,
        cfg: *const git_config,
        name: *const c_char,
    ) -> c_int;
    pub fn git_config_get_int32(
        out: *mut i32,
        cfg: *const git_config,
        name: *const c_char,
    ) -> c_int;
    pub fn git_config_get_int64(
        out: *mut i64,
        cfg: *const git_config,
        name: *const c_char,
    ) -> c_int;
    pub fn git_config_get_string(
        out: *mut *const c_char,
        cfg: *const git_config,
        name: *const c_char,
    ) -> c_int;
    pub fn git_config_get_string_buf(
        out: *mut git_buf,
        cfg: *const git_config,
        name: *const c_char,
    ) -> c_int;
    pub fn git_config_get_path(
        out: *mut git_buf,
        cfg: *const git_config,
        name: *const c_char,
    ) -> c_int;
    pub fn git_config_iterator_free(iter: *mut git_config_iterator);
    pub fn git_config_iterator_glob_new(
        out: *mut *mut git_config_iterator,
        cfg: *const git_config,
        regexp: *const c_char,
    ) -> c_int;
    pub fn git_config_iterator_new(
        out: *mut *mut git_config_iterator,
        cfg: *const git_config,
    ) -> c_int;
    pub fn git_config_new(out: *mut *mut git_config) -> c_int;
    pub fn git_config_next(
        entry: *mut *mut git_config_entry,
        iter: *mut git_config_iterator,
    ) -> c_int;
    pub fn git_config_open_default(out: *mut *mut git_config) -> c_int;
    pub fn git_config_open_global(out: *mut *mut git_config, config: *mut git_config) -> c_int;
    pub fn git_config_open_level(
        out: *mut *mut git_config,
        parent: *const git_config,
        level: git_config_level_t,
    ) -> c_int;
    pub fn git_config_open_ondisk(out: *mut *mut git_config, path: *const c_char) -> c_int;
    pub fn git_config_parse_bool(out: *mut c_int, value: *const c_char) -> c_int;
    pub fn git_config_parse_int32(out: *mut i32, value: *const c_char) -> c_int;
    pub fn git_config_parse_int64(out: *mut i64, value: *const c_char) -> c_int;
    pub fn git_config_set_bool(cfg: *mut git_config, name: *const c_char, value: c_int) -> c_int;
    pub fn git_config_set_int32(cfg: *mut git_config, name: *const c_char, value: i32) -> c_int;
    pub fn git_config_set_int64(cfg: *mut git_config, name: *const c_char, value: i64) -> c_int;
    pub fn git_config_set_multivar(
        cfg: *mut git_config,
        name: *const c_char,
        regexp: *const c_char,
        value: *const c_char,
    ) -> c_int;
    pub fn git_config_set_string(
        cfg: *mut git_config,
        name: *const c_char,
        value: *const c_char,
    ) -> c_int;
    pub fn git_config_snapshot(out: *mut *mut git_config, config: *mut git_config) -> c_int;
    pub fn git_config_entry_free(entry: *mut git_config_entry);
    pub fn git_config_multivar_iterator_new(
        out: *mut *mut git_config_iterator,
        cfg: *const git_config,
        name: *const c_char,
        regexp: *const c_char,
    ) -> c_int;

    // attr
    pub fn git_attr_get(
        value_out: *mut *const c_char,
        repo: *mut git_repository,
        flags: u32,
        path: *const c_char,
        name: *const c_char,
    ) -> c_int;
    pub fn git_attr_value(value: *const c_char) -> git_attr_value_t;

    // cred
    pub fn git_cred_default_new(out: *mut *mut git_cred) -> c_int;
    pub fn git_cred_has_username(cred: *mut git_cred) -> c_int;
    pub fn git_cred_ssh_custom_new(
        out: *mut *mut git_cred,
        username: *const c_char,
        publickey: *const c_char,
        publickey_len: size_t,
        sign_callback: git_cred_sign_callback,
        payload: *mut c_void,
    ) -> c_int;
    pub fn git_cred_ssh_interactive_new(
        out: *mut *mut git_cred,
        username: *const c_char,
        prompt_callback: git_cred_ssh_interactive_callback,
        payload: *mut c_void,
    ) -> c_int;
    pub fn git_cred_ssh_key_from_agent(out: *mut *mut git_cred, username: *const c_char) -> c_int;
    pub fn git_cred_ssh_key_new(
        out: *mut *mut git_cred,
        username: *const c_char,
        publickey: *const c_char,
        privatekey: *const c_char,
        passphrase: *const c_char,
    ) -> c_int;
    pub fn git_cred_ssh_key_memory_new(
        out: *mut *mut git_cred,
        username: *const c_char,
        publickey: *const c_char,
        privatekey: *const c_char,
        passphrase: *const c_char,
    ) -> c_int;
    pub fn git_cred_userpass(
        cred: *mut *mut git_cred,
        url: *const c_char,
        user_from_url: *const c_char,
        allowed_types: c_uint,
        payload: *mut c_void,
    ) -> c_int;
    pub fn git_cred_userpass_plaintext_new(
        out: *mut *mut git_cred,
        username: *const c_char,
        password: *const c_char,
    ) -> c_int;
    pub fn git_cred_username_new(cred: *mut *mut git_cred, username: *const c_char) -> c_int;

    // tags
    pub fn git_tag_annotation_create(
        oid: *mut git_oid,
        repo: *mut git_repository,
        tag_name: *const c_char,
        target: *const git_object,
        tagger: *const git_signature,
        message: *const c_char,
    ) -> c_int;
    pub fn git_tag_create(
        oid: *mut git_oid,
        repo: *mut git_repository,
        tag_name: *const c_char,
        target: *const git_object,
        tagger: *const git_signature,
        message: *const c_char,
        force: c_int,
    ) -> c_int;
    pub fn git_tag_create_frombuffer(
        oid: *mut git_oid,
        repo: *mut git_repository,
        buffer: *const c_char,
        force: c_int,
    ) -> c_int;
    pub fn git_tag_create_lightweight(
        oid: *mut git_oid,
        repo: *mut git_repository,
        tag_name: *const c_char,
        target: *const git_object,
        force: c_int,
    ) -> c_int;
    pub fn git_tag_delete(repo: *mut git_repository, tag_name: *const c_char) -> c_int;
    pub fn git_tag_foreach(
        repo: *mut git_repository,
        callback: git_tag_foreach_cb,
        payload: *mut c_void,
    ) -> c_int;
    pub fn git_tag_free(tag: *mut git_tag);
    pub fn git_tag_id(tag: *const git_tag) -> *const git_oid;
    pub fn git_tag_list(tag_names: *mut git_strarray, repo: *mut git_repository) -> c_int;
    pub fn git_tag_list_match(
        tag_names: *mut git_strarray,
        pattern: *const c_char,
        repo: *mut git_repository,
    ) -> c_int;
    pub fn git_tag_lookup(
        out: *mut *mut git_tag,
        repo: *mut git_repository,
        id: *const git_oid,
    ) -> c_int;
    pub fn git_tag_lookup_prefix(
        out: *mut *mut git_tag,
        repo: *mut git_repository,
        id: *const git_oid,
        len: size_t,
    ) -> c_int;
    pub fn git_tag_message(tag: *const git_tag) -> *const c_char;
    pub fn git_tag_name(tag: *const git_tag) -> *const c_char;
    pub fn git_tag_peel(tag_target_out: *mut *mut git_object, tag: *const git_tag) -> c_int;
    pub fn git_tag_tagger(tag: *const git_tag) -> *const git_signature;
    pub fn git_tag_target(target_out: *mut *mut git_object, tag: *const git_tag) -> c_int;
    pub fn git_tag_target_id(tag: *const git_tag) -> *const git_oid;
    pub fn git_tag_target_type(tag: *const git_tag) -> git_object_t;
    pub fn git_tag_name_is_valid(valid: *mut c_int, tag_name: *const c_char) -> c_int;

    // checkout
    pub fn git_checkout_head(repo: *mut git_repository, opts: *const git_checkout_options)
        -> c_int;
    pub fn git_checkout_index(
        repo: *mut git_repository,
        index: *mut git_index,
        opts: *const git_checkout_options,
    ) -> c_int;
    pub fn git_checkout_tree(
        repo: *mut git_repository,
        treeish: *const git_object,
        opts: *const git_checkout_options,
    ) -> c_int;
    pub fn git_checkout_init_options(opts: *mut git_checkout_options, version: c_uint) -> c_int;

    // merge
    pub fn git_annotated_commit_id(commit: *const git_annotated_commit) -> *const git_oid;
    pub fn git_annotated_commit_ref(commit: *const git_annotated_commit) -> *const c_char;
    pub fn git_annotated_commit_from_ref(
        out: *mut *mut git_annotated_commit,
        repo: *mut git_repository,
        reference: *const git_reference,
    ) -> c_int;
    pub fn git_annotated_commit_from_fetchhead(
        out: *mut *mut git_annotated_commit,
        repo: *mut git_repository,
        branch_name: *const c_char,
        remote_url: *const c_char,
        oid: *const git_oid,
    ) -> c_int;
    pub fn git_annotated_commit_free(commit: *mut git_annotated_commit);
    pub fn git_merge_init_options(opts: *mut git_merge_options, version: c_uint) -> c_int;
    pub fn git_merge(
        repo: *mut git_repository,
        their_heads: *mut *const git_annotated_commit,
        len: size_t,
        merge_opts: *const git_merge_options,
        checkout_opts: *const git_checkout_options,
    ) -> c_int;
    pub fn git_merge_commits(
        out: *mut *mut git_index,
        repo: *mut git_repository,
        our_commit: *const git_commit,
        their_commit: *const git_commit,
        opts: *const git_merge_options,
    ) -> c_int;
    pub fn git_merge_trees(
        out: *mut *mut git_index,
        repo: *mut git_repository,
        ancestor_tree: *const git_tree,
        our_tree: *const git_tree,
        their_tree: *const git_tree,
        opts: *const git_merge_options,
    ) -> c_int;
    pub fn git_repository_state_cleanup(repo: *mut git_repository) -> c_int;

    // merge analysis

    pub fn git_merge_analysis(
        analysis_out: *mut git_merge_analysis_t,
        pref_out: *mut git_merge_preference_t,
        repo: *mut git_repository,
        their_heads: *mut *const git_annotated_commit,
        their_heads_len: usize,
    ) -> c_int;

    pub fn git_merge_analysis_for_ref(
        analysis_out: *mut git_merge_analysis_t,
        pref_out: *mut git_merge_preference_t,
        repo: *mut git_repository,
        git_reference: *mut git_reference,
        their_heads: *mut *const git_annotated_commit,
        their_heads_len: usize,
    ) -> c_int;

    // notes
    pub fn git_note_author(note: *const git_note) -> *const git_signature;
    pub fn git_note_committer(note: *const git_note) -> *const git_signature;
    pub fn git_note_create(
        out: *mut git_oid,
        repo: *mut git_repository,
        notes_ref: *const c_char,
        author: *const git_signature,
        committer: *const git_signature,
        oid: *const git_oid,
        note: *const c_char,
        force: c_int,
    ) -> c_int;
    pub fn git_note_default_ref(out: *mut git_buf, repo: *mut git_repository) -> c_int;
    pub fn git_note_free(note: *mut git_note);
    pub fn git_note_id(note: *const git_note) -> *const git_oid;
    pub fn git_note_iterator_free(it: *mut git_note_iterator);
    pub fn git_note_iterator_new(
        out: *mut *mut git_note_iterator,
        repo: *mut git_repository,
        notes_ref: *const c_char,
    ) -> c_int;
    pub fn git_note_message(note: *const git_note) -> *const c_char;
    pub fn git_note_next(
        note_id: *mut git_oid,
        annotated_id: *mut git_oid,
        it: *mut git_note_iterator,
    ) -> c_int;
    pub fn git_note_read(
        out: *mut *mut git_note,
        repo: *mut git_repository,
        notes_ref: *const c_char,
        oid: *const git_oid,
    ) -> c_int;
    pub fn git_note_remove(
        repo: *mut git_repository,
        notes_ref: *const c_char,
        author: *const git_signature,
        committer: *const git_signature,
        oid: *const git_oid,
    ) -> c_int;

    // blame
    pub fn git_blame_buffer(
        out: *mut *mut git_blame,
        reference: *mut git_blame,
        buffer: *const c_char,
        buffer_len: size_t,
    ) -> c_int;
    pub fn git_blame_file(
        out: *mut *mut git_blame,
        repo: *mut git_repository,
        path: *const c_char,
        options: *mut git_blame_options,
    ) -> c_int;
    pub fn git_blame_free(blame: *mut git_blame);

    pub fn git_blame_init_options(opts: *mut git_blame_options, version: c_uint) -> c_int;
    pub fn git_blame_get_hunk_count(blame: *mut git_blame) -> u32;

    pub fn git_blame_get_hunk_byline(blame: *mut git_blame, lineno: usize)
        -> *const git_blame_hunk;
    pub fn git_blame_get_hunk_byindex(blame: *mut git_blame, index: u32) -> *const git_blame_hunk;

    // revwalk
    pub fn git_revwalk_new(out: *mut *mut git_revwalk, repo: *mut git_repository) -> c_int;
    pub fn git_revwalk_free(walk: *mut git_revwalk);

    pub fn git_revwalk_reset(walk: *mut git_revwalk) -> c_int;

    pub fn git_revwalk_sorting(walk: *mut git_revwalk, sort_mode: c_uint) -> c_int;

    pub fn git_revwalk_push_head(walk: *mut git_revwalk) -> c_int;
    pub fn git_revwalk_push(walk: *mut git_revwalk, oid: *const git_oid) -> c_int;
    pub fn git_revwalk_push_ref(walk: *mut git_revwalk, refname: *const c_char) -> c_int;
    pub fn git_revwalk_push_glob(walk: *mut git_revwalk, glob: *const c_char) -> c_int;
    pub fn git_revwalk_push_range(walk: *mut git_revwalk, range: *const c_char) -> c_int;
    pub fn git_revwalk_simplify_first_parent(walk: *mut git_revwalk) -> c_int;

    pub fn git_revwalk_hide_head(walk: *mut git_revwalk) -> c_int;
    pub fn git_revwalk_hide(walk: *mut git_revwalk, oid: *const git_oid) -> c_int;
    pub fn git_revwalk_hide_ref(walk: *mut git_revwalk, refname: *const c_char) -> c_int;
    pub fn git_revwalk_hide_glob(walk: *mut git_revwalk, refname: *const c_char) -> c_int;
    pub fn git_revwalk_add_hide_cb(
        walk: *mut git_revwalk,
        hide_cb: git_revwalk_hide_cb,
        payload: *mut c_void,
    ) -> c_int;

    pub fn git_revwalk_next(out: *mut git_oid, walk: *mut git_revwalk) -> c_int;

    // merge
    pub fn git_merge_base(
        out: *mut git_oid,
        repo: *mut git_repository,
        one: *const git_oid,
        two: *const git_oid,
    ) -> c_int;

    pub fn git_merge_base_many(
        out: *mut git_oid,
        repo: *mut git_repository,
        length: size_t,
        input_array: *const git_oid,
    ) -> c_int;

    pub fn git_merge_bases(
        out: *mut git_oidarray,
        repo: *mut git_repository,
        one: *const git_oid,
        two: *const git_oid,
    ) -> c_int;

    pub fn git_merge_bases_many(
        out: *mut git_oidarray,
        repo: *mut git_repository,
        length: size_t,
        input_array: *const git_oid,
    ) -> c_int;

    // pathspec
    pub fn git_pathspec_free(ps: *mut git_pathspec);
    pub fn git_pathspec_match_diff(
        out: *mut *mut git_pathspec_match_list,
        diff: *mut git_diff,
        flags: u32,
        ps: *mut git_pathspec,
    ) -> c_int;
    pub fn git_pathspec_match_index(
        out: *mut *mut git_pathspec_match_list,
        index: *mut git_index,
        flags: u32,
        ps: *mut git_pathspec,
    ) -> c_int;
    pub fn git_pathspec_match_list_diff_entry(
        m: *const git_pathspec_match_list,
        pos: size_t,
    ) -> *const git_diff_delta;
    pub fn git_pathspec_match_list_entry(
        m: *const git_pathspec_match_list,
        pos: size_t,
    ) -> *const c_char;
    pub fn git_pathspec_match_list_entrycount(m: *const git_pathspec_match_list) -> size_t;
    pub fn git_pathspec_match_list_failed_entry(
        m: *const git_pathspec_match_list,
        pos: size_t,
    ) -> *const c_char;
    pub fn git_pathspec_match_list_failed_entrycount(m: *const git_pathspec_match_list) -> size_t;
    pub fn git_pathspec_match_list_free(m: *mut git_pathspec_match_list);
    pub fn git_pathspec_match_tree(
        out: *mut *mut git_pathspec_match_list,
        tree: *mut git_tree,
        flags: u32,
        ps: *mut git_pathspec,
    ) -> c_int;
    pub fn git_pathspec_match_workdir(
        out: *mut *mut git_pathspec_match_list,
        repo: *mut git_repository,
        flags: u32,
        ps: *mut git_pathspec,
    ) -> c_int;
    pub fn git_pathspec_matches_path(
        ps: *const git_pathspec,
        flags: u32,
        path: *const c_char,
    ) -> c_int;
    pub fn git_pathspec_new(out: *mut *mut git_pathspec, pathspec: *const git_strarray) -> c_int;

    // diff
    pub fn git_diff_blob_to_buffer(
        old_blob: *const git_blob,
        old_as_path: *const c_char,
        buffer: *const c_char,
        buffer_len: size_t,
        buffer_as_path: *const c_char,
        options: *const git_diff_options,
        file_cb: git_diff_file_cb,
        binary_cb: git_diff_binary_cb,
        hunk_cb: git_diff_hunk_cb,
        line_cb: git_diff_line_cb,
        payload: *mut c_void,
    ) -> c_int;
    pub fn git_diff_blobs(
        old_blob: *const git_blob,
        old_as_path: *const c_char,
        new_blob: *const git_blob,
        new_as_path: *const c_char,
        options: *const git_diff_options,
        file_cb: git_diff_file_cb,
        binary_cb: git_diff_binary_cb,
        hunk_cb: git_diff_hunk_cb,
        line_cb: git_diff_line_cb,
        payload: *mut c_void,
    ) -> c_int;
    pub fn git_diff_buffers(
        old_buffer: *const c_void,
        old_len: size_t,
        old_as_path: *const c_char,
        new_buffer: *const c_void,
        new_len: size_t,
        new_as_path: *const c_char,
        options: *const git_diff_options,
        file_cb: git_diff_file_cb,
        binary_cb: git_diff_binary_cb,
        hunk_cb: git_diff_hunk_cb,
        line_cb: git_diff_line_cb,
        payload: *mut c_void,
    ) -> c_int;
    pub fn git_diff_from_buffer(
        diff: *mut *mut git_diff,
        content: *const c_char,
        content_len: size_t,
    ) -> c_int;
    pub fn git_diff_find_similar(
        diff: *mut git_diff,
        options: *const git_diff_find_options,
    ) -> c_int;
    pub fn git_diff_find_init_options(opts: *mut git_diff_find_options, version: c_uint) -> c_int;
    pub fn git_diff_foreach(
        diff: *mut git_diff,
        file_cb: git_diff_file_cb,
        binary_cb: git_diff_binary_cb,
        hunk_cb: git_diff_hunk_cb,
        line_cb: git_diff_line_cb,
        payload: *mut c_void,
    ) -> c_int;
    pub fn git_diff_free(diff: *mut git_diff);
    pub fn git_diff_get_delta(diff: *const git_diff, idx: size_t) -> *const git_diff_delta;
    pub fn git_diff_get_stats(out: *mut *mut git_diff_stats, diff: *mut git_diff) -> c_int;
    pub fn git_diff_index_to_index(
        diff: *mut *mut git_diff,
        repo: *mut git_repository,
        old_index: *mut git_index,
        new_index: *mut git_index,
        opts: *const git_diff_options,
    ) -> c_int;
    pub fn git_diff_index_to_workdir(
        diff: *mut *mut git_diff,
        repo: *mut git_repository,
        index: *mut git_index,
        opts: *const git_diff_options,
    ) -> c_int;
    pub fn git_diff_init_options(opts: *mut git_diff_options, version: c_uint) -> c_int;
    pub fn git_diff_is_sorted_icase(diff: *const git_diff) -> c_int;
    pub fn git_diff_merge(onto: *mut git_diff, from: *const git_diff) -> c_int;
    pub fn git_diff_num_deltas(diff: *const git_diff) -> size_t;
    pub fn git_diff_num_deltas_of_type(diff: *const git_diff, delta: git_delta_t) -> size_t;
    pub fn git_diff_print(
        diff: *mut git_diff,
        format: git_diff_format_t,
        print_cb: git_diff_line_cb,
        payload: *mut c_void,
    ) -> c_int;
    pub fn git_diff_stats_deletions(stats: *const git_diff_stats) -> size_t;
    pub fn git_diff_stats_files_changed(stats: *const git_diff_stats) -> size_t;
    pub fn git_diff_stats_free(stats: *mut git_diff_stats);
    pub fn git_diff_stats_insertions(stats: *const git_diff_stats) -> size_t;
    pub fn git_diff_stats_to_buf(
        out: *mut git_buf,
        stats: *const git_diff_stats,
        format: git_diff_stats_format_t,
        width: size_t,
    ) -> c_int;
    pub fn git_diff_status_char(status: git_delta_t) -> c_char;
    pub fn git_diff_tree_to_index(
        diff: *mut *mut git_diff,
        repo: *mut git_repository,
        old_tree: *mut git_tree,
        index: *mut git_index,
        opts: *const git_diff_options,
    ) -> c_int;
    pub fn git_diff_tree_to_tree(
        diff: *mut *mut git_diff,
        repo: *mut git_repository,
        old_tree: *mut git_tree,
        new_tree: *mut git_tree,
        opts: *const git_diff_options,
    ) -> c_int;
    pub fn git_diff_tree_to_workdir(
        diff: *mut *mut git_diff,
        repo: *mut git_repository,
        old_tree: *mut git_tree,
        opts: *const git_diff_options,
    ) -> c_int;
    pub fn git_diff_tree_to_workdir_with_index(
        diff: *mut *mut git_diff,
        repo: *mut git_repository,
        old_tree: *mut git_tree,
        opts: *const git_diff_options,
    ) -> c_int;

    pub fn git_graph_ahead_behind(
        ahead: *mut size_t,
        behind: *mut size_t,
        repo: *mut git_repository,
        local: *const git_oid,
        upstream: *const git_oid,
    ) -> c_int;

    pub fn git_graph_descendant_of(
        repo: *mut git_repository,
        commit: *const git_oid,
        ancestor: *const git_oid,
    ) -> c_int;

    pub fn git_diff_format_email(
        out: *mut git_buf,
        diff: *mut git_diff,
        opts: *const git_diff_format_email_options,
    ) -> c_int;
    pub fn git_diff_format_email_options_init(
        opts: *mut git_diff_format_email_options,
        version: c_uint,
    ) -> c_int;

    pub fn git_diff_patchid(
        out: *mut git_oid,
        diff: *mut git_diff,
        opts: *mut git_diff_patchid_options,
    ) -> c_int;
    pub fn git_diff_patchid_options_init(
        opts: *mut git_diff_patchid_options,
        version: c_uint,
    ) -> c_int;

    // patch
    pub fn git_patch_from_diff(out: *mut *mut git_patch, diff: *mut git_diff, idx: size_t)
        -> c_int;
    pub fn git_patch_from_blobs(
        out: *mut *mut git_patch,
        old_blob: *const git_blob,
        old_as_path: *const c_char,
        new_blob: *const git_blob,
        new_as_path: *const c_char,
        opts: *const git_diff_options,
    ) -> c_int;
    pub fn git_patch_from_blob_and_buffer(
        out: *mut *mut git_patch,
        old_blob: *const git_blob,
        old_as_path: *const c_char,
        buffer: *const c_void,
        buffer_len: size_t,
        buffer_as_path: *const c_char,
        opts: *const git_diff_options,
    ) -> c_int;
    pub fn git_patch_from_buffers(
        out: *mut *mut git_patch,
        old_buffer: *const c_void,
        old_len: size_t,
        old_as_path: *const c_char,
        new_buffer: *const c_void,
        new_len: size_t,
        new_as_path: *const c_char,
        opts: *const git_diff_options,
    ) -> c_int;
    pub fn git_patch_free(patch: *mut git_patch);
    pub fn git_patch_get_delta(patch: *const git_patch) -> *const git_diff_delta;
    pub fn git_patch_num_hunks(patch: *const git_patch) -> size_t;
    pub fn git_patch_line_stats(
        total_context: *mut size_t,
        total_additions: *mut size_t,
        total_deletions: *mut size_t,
        patch: *const git_patch,
    ) -> c_int;
    pub fn git_patch_get_hunk(
        out: *mut *const git_diff_hunk,
        lines_in_hunk: *mut size_t,
        patch: *mut git_patch,
        hunk_idx: size_t,
    ) -> c_int;
    pub fn git_patch_num_lines_in_hunk(patch: *const git_patch, hunk_idx: size_t) -> c_int;
    pub fn git_patch_get_line_in_hunk(
        out: *mut *const git_diff_line,
        patch: *mut git_patch,
        hunk_idx: size_t,
        line_of_hunk: size_t,
    ) -> c_int;
    pub fn git_patch_size(
        patch: *mut git_patch,
        include_context: c_int,
        include_hunk_headers: c_int,
        include_file_headers: c_int,
    ) -> size_t;
    pub fn git_patch_print(
        patch: *mut git_patch,
        print_cb: git_diff_line_cb,
        payload: *mut c_void,
    ) -> c_int;
    pub fn git_patch_to_buf(buf: *mut git_buf, patch: *mut git_patch) -> c_int;

    // reflog
    pub fn git_reflog_append(
        reflog: *mut git_reflog,
        id: *const git_oid,
        committer: *const git_signature,
        msg: *const c_char,
    ) -> c_int;
    pub fn git_reflog_delete(repo: *mut git_repository, name: *const c_char) -> c_int;
    pub fn git_reflog_drop(
        reflog: *mut git_reflog,
        idx: size_t,
        rewrite_previous_entry: c_int,
    ) -> c_int;
    pub fn git_reflog_entry_byindex(
        reflog: *const git_reflog,
        idx: size_t,
    ) -> *const git_reflog_entry;
    pub fn git_reflog_entry_committer(entry: *const git_reflog_entry) -> *const git_signature;
    pub fn git_reflog_entry_id_new(entry: *const git_reflog_entry) -> *const git_oid;
    pub fn git_reflog_entry_id_old(entry: *const git_reflog_entry) -> *const git_oid;
    pub fn git_reflog_entry_message(entry: *const git_reflog_entry) -> *const c_char;
    pub fn git_reflog_entrycount(reflog: *mut git_reflog) -> size_t;
    pub fn git_reflog_free(reflog: *mut git_reflog);
    pub fn git_reflog_read(
        out: *mut *mut git_reflog,
        repo: *mut git_repository,
        name: *const c_char,
    ) -> c_int;
    pub fn git_reflog_rename(
        repo: *mut git_repository,
        old_name: *const c_char,
        name: *const c_char,
    ) -> c_int;
    pub fn git_reflog_write(reflog: *mut git_reflog) -> c_int;

    // transport
    pub fn git_transport_register(
        prefix: *const c_char,
        cb: git_transport_cb,
        param: *mut c_void,
    ) -> c_int;
    pub fn git_transport_unregister(prefix: *const c_char) -> c_int;
    pub fn git_transport_smart(
        out: *mut *mut git_transport,
        owner: *mut git_remote,
        payload: *mut c_void,
    ) -> c_int;

    // describe
    pub fn git_describe_commit(
        result: *mut *mut git_describe_result,
        object: *mut git_object,
        opts: *mut git_describe_options,
    ) -> c_int;
    pub fn git_describe_format(
        buf: *mut git_buf,
        result: *const git_describe_result,
        opts: *const git_describe_format_options,
    ) -> c_int;
    pub fn git_describe_result_free(result: *mut git_describe_result);
    pub fn git_describe_workdir(
        out: *mut *mut git_describe_result,
        repo: *mut git_repository,
        opts: *mut git_describe_options,
    ) -> c_int;

    // message
    pub fn git_message_prettify(
        out: *mut git_buf,
        message: *const c_char,
        strip_comments: c_int,
        comment_char: c_char,
    ) -> c_int;

    pub fn git_message_trailers(
        out: *mut git_message_trailer_array,
        message: *const c_char,
    ) -> c_int;

    pub fn git_message_trailer_array_free(trailer: *mut git_message_trailer_array);

    // packbuilder
    pub fn git_packbuilder_new(out: *mut *mut git_packbuilder, repo: *mut git_repository) -> c_int;
    pub fn git_packbuilder_set_threads(pb: *mut git_packbuilder, n: c_uint) -> c_uint;
    pub fn git_packbuilder_insert(
        pb: *mut git_packbuilder,
        id: *const git_oid,
        name: *const c_char,
    ) -> c_int;
    pub fn git_packbuilder_insert_tree(pb: *mut git_packbuilder, id: *const git_oid) -> c_int;
    pub fn git_packbuilder_insert_commit(pb: *mut git_packbuilder, id: *const git_oid) -> c_int;
    pub fn git_packbuilder_insert_walk(pb: *mut git_packbuilder, walk: *mut git_revwalk) -> c_int;
    pub fn git_packbuilder_insert_recur(
        pb: *mut git_packbuilder,
        id: *const git_oid,
        name: *const c_char,
    ) -> c_int;
    pub fn git_packbuilder_write_buf(buf: *mut git_buf, pb: *mut git_packbuilder) -> c_int;
    pub fn git_packbuilder_write(
        pb: *mut git_packbuilder,
        path: *const c_char,
        mode: c_uint,
        progress_cb: git_indexer_progress_cb,
        progress_cb_payload: *mut c_void,
    ) -> c_int;
    #[deprecated = "use `git_packbuilder_name` to retrieve the filename"]
    pub fn git_packbuilder_hash(pb: *mut git_packbuilder) -> *const git_oid;
    pub fn git_packbuilder_name(pb: *mut git_packbuilder) -> *const c_char;
    pub fn git_packbuilder_foreach(
        pb: *mut git_packbuilder,
        cb: git_packbuilder_foreach_cb,
        payload: *mut c_void,
    ) -> c_int;
    pub fn git_packbuilder_object_count(pb: *mut git_packbuilder) -> size_t;
    pub fn git_packbuilder_written(pb: *mut git_packbuilder) -> size_t;
    pub fn git_packbuilder_set_callbacks(
        pb: *mut git_packbuilder,
        progress_cb: git_packbuilder_progress,
        progress_cb_payload: *mut c_void,
    ) -> c_int;
    pub fn git_packbuilder_free(pb: *mut git_packbuilder);

    // indexer
    pub fn git_indexer_new(
        out: *mut *mut git_indexer,
        path: *const c_char,
        mode: c_uint,
        odb: *mut git_odb,
        opts: *mut git_indexer_options,
    ) -> c_int;
    pub fn git_indexer_append(
        idx: *mut git_indexer,
        data: *const c_void,
        size: size_t,
        stats: *mut git_indexer_progress,
    ) -> c_int;
    pub fn git_indexer_commit(idx: *mut git_indexer, stats: *mut git_indexer_progress) -> c_int;
    #[deprecated = "use `git_indexer_name` to retrieve the filename"]
    pub fn git_indexer_hash(idx: *const git_indexer) -> *const git_oid;
    pub fn git_indexer_name(idx: *const git_indexer) -> *const c_char;
    pub fn git_indexer_free(idx: *mut git_indexer);

    pub fn git_indexer_options_init(opts: *mut git_indexer_options, version: c_uint) -> c_int;

    // odb
    pub fn git_repository_odb(out: *mut *mut git_odb, repo: *mut git_repository) -> c_int;
    pub fn git_odb_new(db: *mut *mut git_odb) -> c_int;
    pub fn git_odb_free(db: *mut git_odb);
    pub fn git_odb_open_rstream(
        out: *mut *mut git_odb_stream,
        len: *mut size_t,
        otype: *mut git_object_t,
        db: *mut git_odb,
        oid: *const git_oid,
    ) -> c_int;
    pub fn git_odb_stream_read(
        stream: *mut git_odb_stream,
        buffer: *mut c_char,
        len: size_t,
    ) -> c_int;
    pub fn git_odb_open_wstream(
        out: *mut *mut git_odb_stream,
        db: *mut git_odb,
        size: git_object_size_t,
        obj_type: git_object_t,
    ) -> c_int;
    pub fn git_odb_stream_write(
        stream: *mut git_odb_stream,
        buffer: *const c_char,
        len: size_t,
    ) -> c_int;
    pub fn git_odb_stream_finalize_write(id: *mut git_oid, stream: *mut git_odb_stream) -> c_int;
    pub fn git_odb_stream_free(stream: *mut git_odb_stream);
    pub fn git_odb_foreach(db: *mut git_odb, cb: git_odb_foreach_cb, payload: *mut c_void)
        -> c_int;

    pub fn git_odb_read(
        out: *mut *mut git_odb_object,
        odb: *mut git_odb,
        oid: *const git_oid,
    ) -> c_int;

    pub fn git_odb_read_header(
        len_out: *mut size_t,
        type_out: *mut git_object_t,
        odb: *mut git_odb,
        oid: *const git_oid,
    ) -> c_int;

    pub fn git_odb_write(
        out: *mut git_oid,
        odb: *mut git_odb,
        data: *const c_void,
        len: size_t,
        otype: git_object_t,
    ) -> c_int;

    pub fn git_odb_write_pack(
        out: *mut *mut git_odb_writepack,
        odb: *mut git_odb,
        progress_cb: git_indexer_progress_cb,
        progress_payload: *mut c_void,
    ) -> c_int;

    pub fn git_odb_hash(
        out: *mut git_oid,
        data: *const c_void,
        len: size_t,
        otype: git_object_t,
    ) -> c_int;

    pub fn git_odb_hashfile(out: *mut git_oid, path: *const c_char, otype: git_object_t) -> c_int;

    pub fn git_odb_exists_prefix(
        out: *mut git_oid,
        odb: *mut git_odb,
        short_oid: *const git_oid,
        len: size_t,
    ) -> c_int;

    pub fn git_odb_exists(odb: *mut git_odb, oid: *const git_oid) -> c_int;
    pub fn git_odb_exists_ext(odb: *mut git_odb, oid: *const git_oid, flags: c_uint) -> c_int;

    pub fn git_odb_refresh(odb: *mut git_odb) -> c_int;

    pub fn git_odb_object_id(obj: *mut git_odb_object) -> *const git_oid;
    pub fn git_odb_object_size(obj: *mut git_odb_object) -> size_t;
    pub fn git_odb_object_type(obj: *mut git_odb_object) -> git_object_t;
    pub fn git_odb_object_data(obj: *mut git_odb_object) -> *const c_void;
    pub fn git_odb_object_dup(out: *mut *mut git_odb_object, obj: *mut git_odb_object) -> c_int;
    pub fn git_odb_object_free(obj: *mut git_odb_object);

    pub fn git_odb_init_backend(odb: *mut git_odb_backend, version: c_uint) -> c_int;

    pub fn git_odb_add_backend(
        odb: *mut git_odb,
        backend: *mut git_odb_backend,
        priority: c_int,
    ) -> c_int;

    pub fn git_odb_backend_pack(
        out: *mut *mut git_odb_backend,
        objects_dir: *const c_char,
    ) -> c_int;

    pub fn git_odb_backend_one_pack(
        out: *mut *mut git_odb_backend,
        objects_dir: *const c_char,
    ) -> c_int;

    pub fn git_odb_add_disk_alternate(odb: *mut git_odb, path: *const c_char) -> c_int;

    pub fn git_odb_backend_loose(
        out: *mut *mut git_odb_backend,
        objects_dir: *const c_char,
        compression_level: c_int,
        do_fsync: c_int,
        dir_mode: c_uint,
        file_mode: c_uint,
    ) -> c_int;

    pub fn git_odb_add_alternate(
        odb: *mut git_odb,
        backend: *mut git_odb_backend,
        priority: c_int,
    ) -> c_int;

    pub fn git_odb_backend_malloc(backend: *mut git_odb_backend, len: size_t) -> *mut c_void;

    pub fn git_odb_num_backends(odb: *mut git_odb) -> size_t;
    pub fn git_odb_get_backend(
        backend: *mut *mut git_odb_backend,
        odb: *mut git_odb,
        position: size_t,
    ) -> c_int;

    // mempack
    pub fn git_mempack_new(out: *mut *mut git_odb_backend) -> c_int;
    pub fn git_mempack_reset(backend: *mut git_odb_backend) -> c_int;
    pub fn git_mempack_dump(
        pack: *mut git_buf,
        repo: *mut git_repository,
        backend: *mut git_odb_backend,
    ) -> c_int;

    // refdb
    pub fn git_refdb_new(out: *mut *mut git_refdb, repo: *mut git_repository) -> c_int;
    pub fn git_refdb_open(out: *mut *mut git_refdb, repo: *mut git_repository) -> c_int;
    pub fn git_refdb_backend_fs(
        out: *mut *mut git_refdb_backend,
        repo: *mut git_repository,
    ) -> c_int;
    pub fn git_refdb_init_backend(backend: *mut git_refdb_backend, version: c_uint) -> c_int;
    pub fn git_refdb_set_backend(refdb: *mut git_refdb, backend: *mut git_refdb_backend) -> c_int;
    pub fn git_refdb_compress(refdb: *mut git_refdb) -> c_int;
    pub fn git_refdb_free(refdb: *mut git_refdb);

    // rebase
    pub fn git_rebase_init_options(opts: *mut git_rebase_options, version: c_uint) -> c_int;
    pub fn git_rebase_init(
        out: *mut *mut git_rebase,
        repo: *mut git_repository,
        branch: *const git_annotated_commit,
        upstream: *const git_annotated_commit,
        onto: *const git_annotated_commit,
        opts: *const git_rebase_options,
    ) -> c_int;
    pub fn git_rebase_open(
        out: *mut *mut git_rebase,
        repo: *mut git_repository,
        opts: *const git_rebase_options,
    ) -> c_int;
    pub fn git_rebase_operation_entrycount(rebase: *mut git_rebase) -> size_t;
    pub fn git_rebase_operation_current(rebase: *mut git_rebase) -> size_t;
    pub fn git_rebase_operation_byindex(
        rebase: *mut git_rebase,
        idx: size_t,
    ) -> *mut git_rebase_operation;
    pub fn git_rebase_orig_head_id(rebase: *mut git_rebase) -> *const git_oid;
    pub fn git_rebase_orig_head_name(rebase: *mut git_rebase) -> *const c_char;
    pub fn git_rebase_next(
        operation: *mut *mut git_rebase_operation,
        rebase: *mut git_rebase,
    ) -> c_int;
    pub fn git_rebase_inmemory_index(index: *mut *mut git_index, rebase: *mut git_rebase) -> c_int;
    pub fn git_rebase_commit(
        id: *mut git_oid,
        rebase: *mut git_rebase,
        author: *const git_signature,
        committer: *const git_signature,
        message_encoding: *const c_char,
        message: *const c_char,
    ) -> c_int;
    pub fn git_rebase_abort(rebase: *mut git_rebase) -> c_int;
    pub fn git_rebase_finish(rebase: *mut git_rebase, signature: *const git_signature) -> c_int;
    pub fn git_rebase_free(rebase: *mut git_rebase);

    // cherrypick
    pub fn git_cherrypick_init_options(opts: *mut git_cherrypick_options, version: c_uint)
        -> c_int;
    pub fn git_cherrypick(
        repo: *mut git_repository,
        commit: *mut git_commit,
        options: *const git_cherrypick_options,
    ) -> c_int;
    pub fn git_cherrypick_commit(
        out: *mut *mut git_index,
        repo: *mut git_repository,
        cherrypick_commit: *mut git_commit,
        our_commit: *mut git_commit,
        mainline: c_uint,
        merge_options: *const git_merge_options,
    ) -> c_int;

    // apply
    pub fn git_apply_options_init(opts: *mut git_apply_options, version: c_uint) -> c_int;
    pub fn git_apply_to_tree(
        out: *mut *mut git_index,
        repo: *mut git_repository,
        preimage: *mut git_tree,
        diff: *mut git_diff,
        options: *const git_apply_options,
    ) -> c_int;
    pub fn git_apply(
        repo: *mut git_repository,
        diff: *mut git_diff,
        location: git_apply_location_t,
        options: *const git_apply_options,
    ) -> c_int;

    // revert
    pub fn git_revert_options_init(opts: *mut git_revert_options, version: c_uint) -> c_int;
    pub fn git_revert_commit(
        out: *mut *mut git_index,
        repo: *mut git_repository,
        revert_commit: *mut git_commit,
        our_commit: *mut git_commit,
        mainline: c_uint,
        merge_options: *const git_merge_options,
    ) -> c_int;
    pub fn git_revert(
        repo: *mut git_repository,
        commit: *mut git_commit,
        given_opts: *const git_revert_options,
    ) -> c_int;

    // Common
    pub fn git_libgit2_version(major: *mut c_int, minor: *mut c_int, rev: *mut c_int) -> c_int;
    pub fn git_libgit2_features() -> c_int;
    pub fn git_libgit2_opts(option: c_int, ...) -> c_int;

    // Worktrees
    pub fn git_worktree_list(out: *mut git_strarray, repo: *mut git_repository) -> c_int;
    pub fn git_worktree_lookup(
        out: *mut *mut git_worktree,
        repo: *mut git_repository,
        name: *const c_char,
    ) -> c_int;
    pub fn git_worktree_open_from_repository(
        out: *mut *mut git_worktree,
        repo: *mut git_repository,
    ) -> c_int;
    pub fn git_worktree_free(wt: *mut git_worktree);
    pub fn git_worktree_validate(wt: *const git_worktree) -> c_int;
    pub fn git_worktree_add_options_init(
        opts: *mut git_worktree_add_options,
        version: c_uint,
    ) -> c_int;
    pub fn git_worktree_add(
        out: *mut *mut git_worktree,
        repo: *mut git_repository,
        name: *const c_char,
        path: *const c_char,
        opts: *const git_worktree_add_options,
    ) -> c_int;
    pub fn git_worktree_lock(wt: *mut git_worktree, reason: *const c_char) -> c_int;
    pub fn git_worktree_unlock(wt: *mut git_worktree) -> c_int;
    pub fn git_worktree_is_locked(reason: *mut git_buf, wt: *const git_worktree) -> c_int;
    pub fn git_worktree_name(wt: *const git_worktree) -> *const c_char;
    pub fn git_worktree_path(wt: *const git_worktree) -> *const c_char;
    pub fn git_worktree_prune_options_init(
        opts: *mut git_worktree_prune_options,
        version: c_uint,
    ) -> c_int;
    pub fn git_worktree_is_prunable(
        wt: *mut git_worktree,
        opts: *mut git_worktree_prune_options,
    ) -> c_int;
    pub fn git_worktree_prune(
        wt: *mut git_worktree,
        opts: *mut git_worktree_prune_options,
    ) -> c_int;

    // Ref transactions
    pub fn git_transaction_new(out: *mut *mut git_transaction, repo: *mut git_repository) -> c_int;
    pub fn git_transaction_lock_ref(tx: *mut git_transaction, refname: *const c_char) -> c_int;
    pub fn git_transaction_set_target(
        tx: *mut git_transaction,
        refname: *const c_char,
        target: *const git_oid,
        sig: *const git_signature,
        msg: *const c_char,
    ) -> c_int;
    pub fn git_transaction_set_symbolic_target(
        tx: *mut git_transaction,
        refname: *const c_char,
        target: *const c_char,
        sig: *const git_signature,
        msg: *const c_char,
    ) -> c_int;
    pub fn git_transaction_set_reflog(
        tx: *mut git_transaction,
        refname: *const c_char,
        reflog: *const git_reflog,
    ) -> c_int;
    pub fn git_transaction_remove(tx: *mut git_transaction, refname: *const c_char) -> c_int;
    pub fn git_transaction_commit(tx: *mut git_transaction) -> c_int;
    pub fn git_transaction_free(tx: *mut git_transaction);

    // Mailmap
    pub fn git_mailmap_new(out: *mut *mut git_mailmap) -> c_int;
    pub fn git_mailmap_from_buffer(
        out: *mut *mut git_mailmap,
        buf: *const c_char,
        len: size_t,
    ) -> c_int;
    pub fn git_mailmap_from_repository(
        out: *mut *mut git_mailmap,
        repo: *mut git_repository,
    ) -> c_int;
    pub fn git_mailmap_free(mm: *mut git_mailmap);
    pub fn git_mailmap_resolve_signature(
        out: *mut *mut git_signature,
        mm: *const git_mailmap,
        sig: *const git_signature,
    ) -> c_int;
    pub fn git_mailmap_add_entry(
        mm: *mut git_mailmap,
        real_name: *const c_char,
        real_email: *const c_char,
        replace_name: *const c_char,
        replace_email: *const c_char,
    ) -> c_int;

    // email
    pub fn git_email_create_from_diff(
        out: *mut git_buf,
        diff: *mut git_diff,
        patch_idx: usize,
        patch_count: usize,
        commit_id: *const git_oid,
        summary: *const c_char,
        body: *const c_char,
        author: *const git_signature,
        given_opts: *const git_email_create_options,
    ) -> c_int;

    pub fn git_email_create_from_commit(
        out: *mut git_buf,
        commit: *mut git_commit,
        given_opts: *const git_email_create_options,
    ) -> c_int;

    pub fn git_trace_set(level: git_trace_level_t, cb: git_trace_cb) -> c_int;
}

pub fn init() {
    use std::sync::Once;

    static INIT: Once = Once::new();
    INIT.call_once(|| unsafe {
        openssl_init();
        ssh_init();
        let rc = git_libgit2_init();
        if rc >= 0 {
            // Note that we intentionally never schedule `git_libgit2_shutdown`
            // to get called. There's not really a great time to call that and
            // #276 has some more info about how automatically doing it can
            // cause problems.
            return;
        }

        let git_error = git_error_last();
        let error = if !git_error.is_null() {
            CStr::from_ptr((*git_error).message).to_string_lossy()
        } else {
            "unknown error".into()
        };
        panic!(
            "couldn't initialize the libgit2 library: {}, error: {}",
            rc, error
        );
    });
}

#[cfg(all(unix, feature = "https"))]
#[doc(hidden)]
pub fn openssl_init() {
    openssl_sys::init();
}

#[cfg(any(windows, not(feature = "https")))]
#[doc(hidden)]
pub fn openssl_init() {}

#[cfg(feature = "ssh")]
fn ssh_init() {
    libssh2::init();
}

#[cfg(not(feature = "ssh"))]
fn ssh_init() {}

#[doc(hidden)]
pub fn vendored() -> bool {
    cfg!(libgit2_vendored)
}