Reopen changed files

src/basic/win32.cpp

@@ -262,6 +262,21 @@ bool DeleteFile(String path) {
     return result;
 }
 
+int64_t GetFileModTime(String file) {
+    Scratch          scratch;
+    String16         string16 = ToString16(scratch, file);
+    WIN32_FIND_DATAW data;
+    HANDLE           handle = FindFirstFileW(string16.data, &data);
+    if (handle != INVALID_HANDLE_VALUE) {
+        FindClose(handle);
+        FILETIME time   = data.ftLastWriteTime;
+        int64_t  result = (int64_t)time.dwHighDateTime << 32 | time.dwLowDateTime;
+        return result;
+    } else {
+        return -1;
+    }
+}
+
 struct Win32Process {
     HANDLE handle;
     HANDLE child_stdout_read;