Extract get_changes

Author: cruessler

gix-blame/src/lib.rs

@@ -659,6 +659,40 @@ fn get_changes_for_file_path(
         .collect()
 }
 
+fn get_changes(
+    odb: impl gix_object::Find + gix_object::FindHeader,
+    resource_cache: &mut gix_diff::blob::Platform,
+    oid: ObjectId,
+    previous_oid: ObjectId,
+    file_path: &BStr,
+) -> Vec<Change> {
+    resource_cache
+        .set_resource(
+            previous_oid,
+            gix_object::tree::EntryKind::Blob,
+            file_path,
+            gix_diff::blob::ResourceKind::OldOrSource,
+            &odb,
+        )
+        .unwrap();
+    resource_cache
+        .set_resource(
+            oid,
+            gix_object::tree::EntryKind::Blob,
+            file_path,
+            gix_diff::blob::ResourceKind::NewOrDestination,
+            &odb,
+        )
+        .unwrap();
+
+    let outcome = resource_cache.prepare_diff().unwrap();
+    let input = outcome.interned_input();
+    let number_of_lines_in_destination = input.after.len();
+    let change_recorder = ChangeRecorder::new(number_of_lines_in_destination.try_into().unwrap());
+
+    gix_diff::blob::diff(gix_diff::blob::Algorithm::Histogram, &input, change_recorder)
+}
+
 /// This function merges adjacent blame entries. It merges entries that are adjacent both in the
 /// blamed file and in the original file that introduced them. This follows `git`’s
 /// behaviour. `libgit2`, as of 2024-09-19, only checks whether two entries are adjacent in the
@@ -804,30 +838,7 @@ pub fn blame_file<E>(
             }
         };
 
-        resource_cache
-            .set_resource(
-                *previous_oid,
-                gix_object::tree::EntryKind::Blob,
-                file_path,
-                gix_diff::blob::ResourceKind::OldOrSource,
-                &odb,
-            )
-            .unwrap();
-        resource_cache
-            .set_resource(
-                *oid,
-                gix_object::tree::EntryKind::Blob,
-                file_path,
-                gix_diff::blob::ResourceKind::NewOrDestination,
-                &odb,
-            )
-            .unwrap();
-
-        let outcome = resource_cache.prepare_diff().unwrap();
-        let input = outcome.interned_input();
-        let number_of_lines_in_destination = input.after.len();
-        let change_recorder = ChangeRecorder::new(number_of_lines_in_destination.try_into().unwrap());
-        let changes = gix_diff::blob::diff(gix_diff::blob::Algorithm::Histogram, &input, change_recorder);
+        let changes = get_changes(&odb, resource_cache, *oid, *previous_oid, file_path);
         lines_to_blame = process_changes(&mut out, &lines_to_blame, &changes, suspect);
     }