refactor (#470)

Author: Byron

gitoxide-core/src/hours.rs

@@ -204,29 +204,29 @@ where
                                                     if entry_mode.is_no_tree() {
                                                         files.modified += 1;
                                                     }
-                                                    if line_stats {
-                                                        if let Some(Ok(diff)) = change.event.diff() {
-                                                            use git::diff::lines::similar::ChangeTag::*;
-                                                            let mut nl = 0;
-                                                            for change in diff
-                                                                .text(git::diff::lines::Algorithm::Myers)
-                                                                .iter_all_changes()
-                                                            {
-                                                                match change.tag() {
-                                                                    Delete => {
-                                                                        lines.removed += 1;
-                                                                        nl += 1;
-                                                                    }
-                                                                    Insert => {
-                                                                        lines.added += 1;
-                                                                        nl += 1
-                                                                    }
-                                                                    Equal => {}
+                                                    if let Some(Ok(diff)) =
+                                                        line_stats.then(|| change.event.diff()).flatten()
+                                                    {
+                                                        use git::diff::lines::similar::ChangeTag::*;
+                                                        let mut nl = 0;
+                                                        for change in diff
+                                                            .text(git::diff::lines::Algorithm::Myers)
+                                                            .iter_all_changes()
+                                                        {
+                                                            match change.tag() {
+                                                                Delete => {
+                                                                    lines.removed += 1;
+                                                                    nl += 1;
                                                                 }
+                                                                Insert => {
+                                                                    lines.added += 1;
+                                                                    nl += 1
+                                                                }
+                                                                Equal => {}
                                                             }
-                                                            if let Some(c) = lines_counter.as_ref() {
-                                                                c.fetch_add(nl, Ordering::SeqCst);
-                                                            }
+                                                        }
+                                                        if let Some(c) = lines_counter.as_ref() {
+                                                            c.fetch_add(nl, Ordering::SeqCst);
                                                         }
                                                     }
                                                 }