From 9f5c0b6e6049fa53807be3334ce7ce96de2d24b4 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <superjoe30@gmail.com>
Date: Fri, 19 Jan 2018 16:30:50 -0500
Subject: [PATCH] windows-compatible os_rename function

windows libc rename() requires destination file path to not exist
---
 src/os.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/os.cpp b/src/os.cpp
index ef12464c8c..48512a273d 100644
--- a/src/os.cpp
+++ b/src/os.cpp
@@ -794,7 +794,18 @@ int os_delete_file(Buf *path) {
 }
 
 int os_rename(Buf *src_path, Buf *dest_path) {
+    if (buf_eql_buf(src_path, dest_path)) {
+        return 0;
+    }
     if (rename(buf_ptr(src_path), buf_ptr(dest_path)) == -1) {
+        // Windows requires the dest path to be missing
+        if (errno == EACCES) {
+            remove(buf_ptr(dest_path));
+            if (rename(buf_ptr(src_path), buf_ptr(dest_path)) == -1) {
+                return ErrorFileSystem;
+            }
+            return 0;
+        }
         return ErrorFileSystem;
     }
     return 0;