fix: Replace renameio with natefinch/atomic for Windows compatibility

- Remove dependency on google/renameio which doesn't support Windows
- Use natefinch/atomic which provides cross-platform atomic file operations
- Fixes issue #9: Windows Compatibility

This change enables the hnsw library to work on Windows platforms,
allowing projects that depend on it to be cross-compiled for Windows.

Author: soaringjerry

encode.go

@@ -2,13 +2,14 @@ package hnsw
 
 import (
 	"bufio"
+	"bytes"
 	"cmp"
 	"encoding/binary"
 	"fmt"
 	"io"
 	"os"
 
-	"github.com/google/renameio"
+	"github.com/natefinch/atomic"
 )
 
 // errorEncoder is a helper type to encode multiple values
@@ -301,14 +302,11 @@ func LoadSavedGraph[K cmp.Ordered](path string) (*SavedGraph[K], error) {
 
 // Save writes the graph to the file.
 func (g *SavedGraph[K]) Save() error {
-	tmp, err := renameio.TempFile("", g.Path)
-	if err != nil {
-		return err
-	}
-	defer tmp.Cleanup()
-
-	wr := bufio.NewWriter(tmp)
-	err = g.Export(wr)
+	// Create a buffer to write the data
+	var buf bytes.Buffer
+	wr := bufio.NewWriter(&buf)
+	
+	err := g.Export(wr)
 	if err != nil {
 		return fmt.Errorf("exporting: %w", err)
 	}
@@ -318,9 +316,10 @@ func (g *SavedGraph[K]) Save() error {
 		return fmt.Errorf("flushing: %w", err)
 	}
 
-	err = tmp.CloseAtomicallyReplace()
+	// Use atomic.WriteFile to write the buffer contents atomically
+	err = atomic.WriteFile(g.Path, &buf)
 	if err != nil {
-		return fmt.Errorf("closing atomically: %w", err)
+		return fmt.Errorf("writing atomically: %w", err)
 	}
 
 	return nil

go.mod

@@ -8,6 +8,7 @@ require github.com/google/renameio v1.0.1
 
 require (
 	github.com/chewxy/math32 v1.10.1 // indirect
+	github.com/natefinch/atomic v1.0.1 // indirect
 	github.com/viterin/partial v1.1.0 // indirect
 	github.com/viterin/vek v0.4.2 // indirect
 	golang.org/x/sys v0.11.0 // indirect

go.sum

@@ -4,6 +4,8 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/google/renameio v1.0.1 h1:Lh/jXZmvZxb0BBeSY5VKEfidcbcbenKjZFzM/q0fSeU=
 github.com/google/renameio v1.0.1/go.mod h1:t/HQoYBZSsWSNK35C6CO/TpPLDVWvxOHboWUAweKUpk=
+github.com/natefinch/atomic v1.0.1 h1:ZPYKxkqQOx3KZ+RsbnP/YsgvxWQPGxjC0oBt2AhwV0A=
+github.com/natefinch/atomic v1.0.1/go.mod h1:N/D/ELrljoqDyT3rZrsUmtsuzvHkeB/wWjHV22AZRbM=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=