Begin design of comment evaluation and {{variables}}

src/basic/basic_os.cpp

@@ -1172,3 +1172,25 @@ API void CloseStdin(Process *process) {
 API double GetTimeSeconds() {
     return GetTimeMicros() / 1000000.0;
 }
+
+API String WriteTempFile(String data) {
+    Scratch scratch;
+
+#if OS_WINDOWS
+    int buffer_len = MAX_PATH+1;
+    char16_t *buffer = AllocArray(scratch, char16_t, buffer_len);
+    Assert(sizeof(char16_t) == sizeof(wchar_t));
+    DWORD result = GetTempPath2W(buffer_len, (LPWSTR)buffer);
+    Assert(result != 0);
+    String16 temp16 = {buffer, result};
+    NormalizePathInPlace(temp16);
+    String temp_directory = ToString(scratch, temp16);
+#else
+    String temp_directory = "/tmp";
+#endif
+
+    String temp_filename = Format(scratch, "%S/temp%llu", temp_directory, GetTimeNanos());
+    bool done = WriteFile(temp_filename, data);
+    Assert(done);
+    return temp_filename;
+}