feat: create function to allow setting commit_create_cb while rebasing

Author: Pranav2612000

src/rebase.rs

@@ -1,9 +1,11 @@
 use std::ffi::CString;
 use std::{marker, mem, ptr, str};
 
+use libc::c_void;
+
 use crate::build::CheckoutBuilder;
 use crate::util::Binding;
-use crate::{raw, Error, Index, MergeOptions, Oid, Signature};
+use crate::{raw, Commit, Error, Index, MergeOptions, Oid, Signature, Tree};
 
 /// Rebase options
 ///
@@ -34,6 +36,20 @@ impl<'cb> RebaseOptions<'cb> {
         opts
     }
 
+    /// Used by `Repository::rebase`, this will trigger a callback
+    /// when creating commits. For example, to sign commits
+     pub fn commit_create_cb(&mut self, commit_create_cb_op: Option<fn(&Oid, &Signature<'_>, &Signature<'_>, &i8, &i8, &Tree<'_>, usize, &Commit<'_>, *mut c_void) -> i32>) -> &mut RebaseOptions<'cb> {
+
+        unsafe {
+            //let parsed = std::mem::transmute(commit_create_cb_closure);
+                if let Some(commit_create_cb) = commit_create_cb_op {
+                    self.raw.commit_create_cb = Some(std::mem::transmute(commit_create_cb));
+                }
+        }
+
+        self
+    }
+
     /// Used by `Repository::rebase`, this will instruct other clients working on this
     /// rebase that you want a quiet rebase experience, which they may choose to
     /// provide in an application-specific manner. This has no effect upon