Add readline 8.2 to third_party

third_party/readline/rlshell.h

@@ -0,0 +1,33 @@
+/* rlshell.h -- utility functions normally provided by bash. */
+
+/* Copyright (C) 1999-2021 Free Software Foundation, Inc.
+
+   This file is part of the GNU Readline Library (Readline), a library
+   for reading lines of text with interactive input and history editing.      
+
+   Readline is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Readline is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Readline.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#if !defined (_RL_SHELL_H_)
+#define _RL_SHELL_H_
+
+#include "rlstdc.h"
+
+extern char *sh_single_quote (char *);
+extern void sh_set_lines_and_columns (int, int);
+extern char *sh_get_env_value (const char *);
+extern char *sh_get_home_dir (void);
+extern int sh_unset_nodelay_mode (int);
+
+#endif /* _RL_SHELL_H_ */