Merge pull request #1046 from onee-only/optimize-commit-worker-path

plumbing: object, Optimize logging with file.

plumbing/object/commit_walker_path.go

···
 }
 
 func (c *commitPathIter) getNextFileCommit() (*Commit, error) {
+	var parentTree, currentTree *Tree
+
 	for {
 		// Parent-commit can be nil if the current-commit is the initial commit
 		parentCommit, parentCommitErr := c.sourceIter.Next()
···
 			parentCommit = nil
 		}
 
-		// Fetch the trees of the current and parent commits
-		currentTree, currTreeErr := c.currentCommit.Tree()
-		if currTreeErr != nil {
-			return nil, currTreeErr
+		if parentTree == nil {
+			var currTreeErr error
+			currentTree, currTreeErr = c.currentCommit.Tree()
+			if currTreeErr != nil {
+				return nil, currTreeErr
+			}
+		} else {
+			currentTree = parentTree
+			parentTree = nil
 		}
 
-		var parentTree *Tree
 		if parentCommit != nil {
 			var parentTreeErr error
 			parentTree, parentTreeErr = parentCommit.Tree()

plumbing/object/treenoder.go

···
 		}
 	}
 
-	return transformChildren(parent)
+	var err error
+	t.children, err = transformChildren(parent)
+	return t.children, err
 }
 
 // Returns the children of a tree as treenoders.