lib: split out RepoCheckoutFilter

rust-bindings/rust/src/repo_checkout_at_options/repo_checkout_filter.rs

@@ -0,0 +1,24 @@
+use crate::{Repo, RepoCheckoutFilterResult};
+use glib::translate::{FromGlibPtrNone, ToGlib};
+use glib_sys::gpointer;
+use libc::c_char;
+use ostree_sys::{OstreeRepo, OstreeRepoCheckoutFilterResult};
+use std::path::{Path, PathBuf};
+
+pub type RepoCheckoutFilter =
+    Option<Box<dyn Fn(&Repo, &Path, &libc::stat) -> RepoCheckoutFilterResult>>;
+
+pub(super) unsafe extern "C" fn filter_trampoline(
+    repo: *mut OstreeRepo,
+    path: *const c_char,
+    stat: *mut libc::stat,
+    user_data: gpointer,
+) -> OstreeRepoCheckoutFilterResult {
+    // TODO: handle unwinding
+    let closure =
+        user_data as *const Box<dyn Fn(&Repo, &Path, &libc::stat) -> RepoCheckoutFilterResult>;
+    let repo = FromGlibPtrNone::from_glib_none(repo);
+    let path: PathBuf = FromGlibPtrNone::from_glib_none(path);
+    let result = (*closure)(&repo, &path, &*stat);
+    result.to_glib()
+}