write no empty commits

src/main.rs

@@ -752,29 +752,39 @@ async fn write_commit(config:WriteCommitConfig,b:Result<AResult<(AssetVersion,De
 	let tree_id={
 		let mut tree_index = repo.index()?;
 		tree_index.add_all([config.output_folder].iter(),git2::IndexAddOption::DEFAULT,None)?;
+		if tree_index.len()==0{
+			println!("tree_index.len()==0");
+			return Ok(());
+		}
 		tree_index.write_tree()?
 	};
 	let tree=repo.find_tree(tree_id)?;
 
+	let mut parents=Vec::new();
+
 	match repo.head(){
-		Ok(reference)=>repo.commit(
-			Some("HEAD"),//update_ref
-			&sig,//author
-			&sig,//commiter
-			&format!("v{}", asset_version.assetVersionNumber),//message
-			&tree,//tree (basically files)
-			&[&reference.peel_to_commit()?],//parents
-		)?,
-		Err(_)=>repo.commit(
-			Some("HEAD"),//update_ref
-			&sig,//author
-			&sig,//commiter
-			&format!("v{}", asset_version.assetVersionNumber),//message
-			&tree,//tree (basically files)
-			&[],//parents
-		)?,
+		Ok(reference)=>{
+			let commit=reference.peel_to_commit()?;
+			let commit_tree=commit.tree()?;
+			let diff=repo.diff_tree_to_tree(Some(&commit_tree),Some(&tree),None)?;
+			if diff.deltas().count()==0{
+				println!("no changes");
+				return Ok(());
+			}
+			parents.push(commit);
+		},
+		Err(e)=>println!("repo head error {:?}",e),
 	};
 
+	repo.commit(
+		Some("HEAD"),//update_ref
+		&sig,//author
+		&sig,//commiter
+		&format!("v{}", asset_version.assetVersionNumber),//message
+		&tree,//tree (basically files)
+		parents.iter().collect::<Vec<&git2::Commit<'_>>>().as_slice(),//parents
+	)?;
+
 	//commit
 	Ok(())
 }