diff --git a/src/string_utils.cc b/src/string_utils.cc
index 2ae8ea6f..212cab2e 100644
--- a/src/string_utils.cc
+++ b/src/string_utils.cc
@@ -359,6 +359,11 @@ StringView format_to(ArrayView<char> buffer, StringView fmt, ArrayView<const Str
     return { buffer.begin(), ptr };
 }
 
+void format_with(FunctionRef<void (StringView)> append, StringView fmt, ArrayView<const StringView> params)
+{
+    format_impl(fmt, params, append);
+}
+
 String format(StringView fmt, ArrayView<const StringView> params)
 {
     ByteCount size = fmt.length();
diff --git a/src/string_utils.hh b/src/string_utils.hh
index 4da7ddc3..e0adc181 100644
--- a/src/string_utils.hh
+++ b/src/string_utils.hh
@@ -6,6 +6,7 @@
 #include "vector.hh"
 #include "ranges.hh"
 #include "optional.hh"
+#include "utils.hh"
 
 namespace Kakoune
 {
@@ -161,6 +162,14 @@ StringView format_to(ArrayView<char> buffer, StringView fmt, Types&&... params)
     return format_to(buffer, fmt, ArrayView<const StringView>{detail::format_param(std::forward<Types>(params))...});
 }
 
+void format_with(FunctionRef<void (StringView)> append, StringView fmt, ArrayView<const StringView> params);
+
+template<typename... Types>
+void format_with(FunctionRef<void (StringView)> append, StringView fmt, Types&&... params)
+{
+    return format_with(append, fmt, ArrayView<const StringView>{detail::format_param(std::forward<Types>(params))...});
+}
+
 String double_up(StringView s, StringView characters);
 
 inline String quote(StringView s)