add apply sys api

seems like enum flags need to be untyped (fix ci)

trying to fix windows ci issue

fix typo

next try fixing windows warning

next windows ci fix

Author: Stephan Dilly

libgit2-sys/lib.rs

@@ -23,6 +23,7 @@ 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;
 
 macro_rules! git_enum {
     (pub enum $name:ident { $($variants:tt)* }) => {
@@ -1728,6 +1729,35 @@ pub struct git_cherrypick_options {
     pub checkout_opts: git_checkout_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,
+    }
+}
+
 extern "C" {
     // threads
     pub fn git_libgit2_init() -> c_int;
@@ -3587,6 +3617,22 @@ extern "C" {
         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;
 }
 
 pub fn init() {