Implement more sophisticated readline-mode

luprex/core/cpp/util.hpp

@@ -56,6 +56,12 @@ std::string hash_to_hex(const HashValue &hash);
 // Split a string into multiple strings
 StringVec split(const std::string &s, char sep);
 
+// Return N repetitions of string A
+std::string repeat_string(const std::string &a, int n);
+
+// Return the length of the common prefix of A and B.
+int common_prefix_length(const std::string &a, const std::string &b);
+
 // String to lowercase/uppercase.  Ascii only, no unicode.
 std::string tolower(std::string input);
 std::string toupper(std::string input);