From c2ce265afacc416af86918377298d76b53cde79b Mon Sep 17 00:00:00 2001
From: Jiahao XU <Jiahao_XU@outlook.com>
Date: Thu, 21 Jul 2022 22:18:08 +1000
Subject: [PATCH] Optimize `Crates2Json::write_to_path`: Use `to_writer`

which avoids allocating a `Vec<u8>` just to hold serialized data.

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>
---
 src/metafiles/v2.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/metafiles/v2.rs b/src/metafiles/v2.rs
index f4ea5573..c7d0f337 100644
--- a/src/metafiles/v2.rs
+++ b/src/metafiles/v2.rs
@@ -60,7 +60,8 @@ impl Crates2Json {
     }
 
     pub fn write_to_path(&self, path: impl AsRef<Path>) -> Result<(), Crates2JsonParseError> {
-        fs::write(path, &serde_json::to_vec(&self)?)?;
+        let file = fs::File::create(path.as_ref())?;
+        serde_json::to_writer(file, &self)?;
         Ok(())
     }