build: fix bump read/write

1 files changed, 10 insertions, 5 deletions

diff --git a/xtask/src/release/bump.rs b/xtask/src/release/bump.rs
index 617cfd6..7a817e7 100644
--- a/xtask/src/release/bump.rs
+++ b/xtask/src/release/bump.rs
@@ -1,7 +1,7 @@
 use std::{
     fmt::Display,
     fs::File,
-    io::{Read, Write},
+    io::{BufRead, BufReader, BufWriter, Read, Write},
     path::Path,
     process::Command,
     str::FromStr,
@@ -83,9 +83,10 @@ impl Bump {
             path.display()
         );
 
-        let file = File::open(path)?;
+        let reader = File::options().read(true).open(path)?;
+        let writer = File::options().write(true).open(path)?;
 
-        self.bump(&file, &file, mutator)?;
+        self.bump(reader, writer, mutator)?;
 
         let git_added = Command::new("git").arg("add").arg(path).status()?;
 
@@ -94,18 +95,22 @@ impl Bump {
         Ok(())
     }
 
-    fn bump<R, W, F>(&self, mut reader: R, mut writer: W, mutator: F) -> Result<()>
+    fn bump<R, W, F>(&self, reader: R, writer: W, mutator: F) -> Result<()>
     where
         R: Read,
         W: Write,
         F: Fn(String, &Self) -> Result<String>,
     {
+        let mut reader = BufReader::new(reader);
+        let mut writer = BufWriter::new(writer);
         let mut buf = String::new();
+
         reader.read_to_string(&mut buf)?;
 
         let buf = mutator(buf, self)?;
 
-        writer.write_all(buf.as_bytes()).map_err(Into::into)
+        writer.write_all(buf.as_bytes())?;
+        writer.flush().map_err(Into::into)
     }
 }