From d432d54c28c759e04c6acc7d92a1e691e9194dd4 Mon Sep 17 00:00:00 2001
From: Jiahao XU <Jiahao_XU@outlook.com>
Date: Fri, 22 Jul 2022 22:48:54 +1000
Subject: [PATCH] Add new fn `Crates2Json::write_to_file`

Signed-off-by: Jiahao XU <Jiahao_XU@outlook.com>
---
 src/metafiles/v2.rs | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/metafiles/v2.rs b/src/metafiles/v2.rs
index 3b8d681a..213461c3 100644
--- a/src/metafiles/v2.rs
+++ b/src/metafiles/v2.rs
@@ -1,6 +1,7 @@
 use std::{
     collections::{BTreeMap, BTreeSet},
-    fs, io,
+    fs,
+    io::{self, Seek},
     iter::IntoIterator,
     path::{Path, PathBuf},
 };
@@ -70,6 +71,14 @@ impl Crates2Json {
         Ok(())
     }
 
+    pub fn write_to_file(&self, file: &mut fs::File) -> Result<(), Crates2JsonParseError> {
+        self.write_to_writer(&mut *file)?;
+        let pos = file.stream_position()?;
+        file.set_len(pos)?;
+
+        Ok(())
+    }
+
     pub fn write_to_path(&self, path: impl AsRef<Path>) -> Result<(), Crates2JsonParseError> {
         let file = fs::File::create(path.as_ref())?;
         self.write_to_writer(file)