* defs.h (read_command_lines_1): Declare.
* cli/cli-script.c (read_next_line): Only return string,
do not process.
(process_next_line): New, extracted from read_next_line.
(recurse_read_control_structure): Take a function pointer to the
read function.
(get_command_line) Pass the read_next_line as reader function
into recurse_read_control_structure.
(read_command_lines_1): New, extracted from...
(read_command_lines): ...here.