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Term::ReadLine::Gnu - Perl extension for the GNU Readline/History Library


  use Term::ReadLine;
  $term = new Term::ReadLine 'ProgramName';
  while ( defined ($_ = $term->readline('prompt>')) ) {



This is an implementation of Term::ReadLine using the GNU Readline/History Library.

For basic functions object oriented interface is provided. These are described in the section "Standard Methods" and "Term::ReadLine::Gnu Functions".

This package also has the interface with the almost all functions and variables which are documented in the GNU Readline/History Library Manual. They are documented in the section "Term::ReadLine::Gnu Functions" and "Term::ReadLine::Gnu Variables" briefly. For more detail of the GNU Readline/History Library, see 'GNU Readline Library Manual' and 'GNU History Library Manual'.

The sample programs under eg/ directory and test programs under t/ directory in the Term::ReadLine::Gnu distribution include many example of this module.

Standard Methods

These methods are standard methods defined by Term::ReadLine.


returns the actual package that executes the commands. If you have installed this package, possible value is Term::ReadLine::Gnu.


returns the handle for subsequent calls to following functions. Argument is the name of the application. Optionally can be followed by two arguments for IN and OUT file handles. These arguments should be globs.


gets an input line, with actual GNU Readline support. Trailing newline is removed. Returns undef on EOF. PREPUT is an optional argument meaning the initial value of input.

The optional argument PREPUT is granted only if the value preput is in Features.

PROMPT may include some escape sequences. Use RL_PROMPT_START_IGNORE to begin a sequence of non-printing characters, and RL_PROMPT_END_IGNORE to end of such a sequence.

AddHistory(LINE1, LINE2, ...)

adds the lines to the history of input, from where it can be used if the actual readline is present.


return the file handles for input and output or undef if readline input and output cannot be used for Perl.


If argument MAX is specified, it is an advice on minimal size of line to be included into history. undef means do not include anything into history. Returns the old value.


returns an array with two strings that give most appropriate names for files for input and output using conventions "<$in", ">$out".


returns a reference to a hash which describes internal configuration (variables) of the package. Names of keys in this hash conform to standard conventions with the leading rl_ stripped.

See section "Variables" for supported variables.


Returns a reference to a hash with keys being features present in current implementation. Several optional features are used in the minimal interface: appname should be present if the first argument to new is recognized, and minline should be present if MinLine method is not dummy. autohistory should be present if lines are put into history automatically (maybe subject to MinLine), and addHistory if AddHistory method is not dummy. preput means the second argument to readline method is processed. getHistory and setHistory denote that the corresponding methods are present. tkRunning denotes that a Tk application may run while ReadLine is getting input.

Term::ReadLine::Gnu Functions

All these GNU Readline/History Library functions are callable via method interface and have names which conform to standard conventions with the leading rl_ stripped.

Almost methods have lower level functions in Term::ReadLine::Gnu::XS package. To use them full qualified name is required. Using method interface is preferred.

Readline Convenience Functions
Naming Function
add_defun(NAME, FUNC [,KEY=-1])

Add name to the Perl function FUNC. If optional argument KEY is specified, bind it to the FUNC. Returns reference to FunctionPtr.

        # name name `reverse-line' to a function reverse_line(),
        # and bind it to "\C-t"
        $term->add_defun('reverse-line', \&reverse_line, ord "\ct");
Selecting a Keymap
        Keymap  rl_make_bare_keymap()
        Keymap  rl_copy_keymap(Keymap|str map)
        Keymap  rl_make_keymap()
        Keymap  rl_discard_keymap(Keymap|str map)
        void    rl_free_keymap(Keymap|str map)
        Keymap  rl_get_keymap()
        Keymap  rl_set_keymap(Keymap|str map)
        Keymap  rl_get_keymap_by_name(str name)
        str     rl_get_keymap_name(Keymap map)
Binding Keys
bind_key(KEY, FUNCTION [,MAP])
        int     rl_bind_key(int key, FunctionPtr|str function,
                            Keymap|str map = rl_get_keymap())

Bind KEY to the FUNCTION. FUNCTION is the name added by the add_defun method. If optional argument MAP is specified, binds in MAP. Returns non-zero in case of error.

bind_key_if_unbound(KEY, FUNCTION [,MAP])
        int     rl_bind_key_if_unbound(int key, FunctionPtr|str function,
                                       Keymap|str map = rl_get_keymap()) #GRL5.0
unbind_key(KEY [,MAP])
        int     rl_unbind_key(int key, Keymap|str map = rl_get_keymap())

Bind KEY to the null function. Returns non-zero in case of error.

unbind_function(FUNCTION [,MAP])
        int     rl_unbind_function(FunctionPtr|str function,
                                   Keymap|str map = rl_get_keymap())
unbind_command(COMMAND [,MAP])
        int     rl_unbind_command(str command,
                                  Keymap|str map = rl_get_keymap())
bind_keyseq(KEYSEQ, FUNCTION [,MAP])
        int     rl_bind_keyseq(str keyseq, FunctionPtr|str function,
                               Keymap|str map = rl_get_keymap()) # GRL 5.0
        int     rl_set_key(str keyseq, FunctionPtr|str function,
                           Keymap|str map = rl_get_keymap())
bind_keyseq_if_unbound(KEYSEQ, FUNCTION [,MAP])
        int     rl_bind_keyseq_if_unbound(str keyseq, FunctionPtr|str function,
                                          Keymap|str map = rl_get_keymap()) # GRL 5.0
generic_bind(TYPE, KEYSEQ, DATA, [,MAP])
        int     rl_generic_bind(int type, str keyseq,
                                FunctionPtr|Keymap|str data,
                                Keymap|str map = rl_get_keymap())
        void    rl_parse_and_bind(str line)

Parse LINE as if it had been read from the ~/.inputrc file and perform any key bindings and variable assignments found. For more detail see 'GNU Readline Library Manual'.

        int     rl_read_init_file(str filename = '~/.inputrc')
Associating Function Names and Bindings
        FunctionPtr rl_named_function(str name)
        str     rl_get_function_name(FunctionPtr function)
function_of_keyseq(KEYMAP [,MAP])
        (FunctionPtr|Keymap|str data, int type)
                rl_function_of_keyseq(str keyseq,
                                      Keymap|str map = rl_get_keymap())
invoking_keyseqs(FUNCTION [,MAP])
        (@str)  rl_invoking_keyseqs(FunctionPtr|str function,
                                    Keymap|str map = rl_get_keymap())
        void    rl_function_dumper(int readable = 0)
        void    rl_list_funmap_names()
        (@str)  rl_funmap_names()
add_funmap_entry(NAME, FUNCTION)
        int     rl_add_funmap_entry(char *name, FunctionPtr|str function)
Allowing Undoing
        int     rl_begin_undo_group()
        int     rl_end_undo_group()
add_undo(WHAT, START, END, TEXT)
        int     rl_add_undo(int what, int start, int end, str text)
        void    rl_free_undo_list()
        int     rl_do_undo()
modifying([START [,END]])
        int     rl_modifying(int start = 0, int end = rl_end)
        void    rl_redisplay()
        int     rl_forced_update_display()
        int     rl_on_new_line()
        int     rl_on_new_line_with_prompt()    # GRL 4.1
        int     rl_reset_line_state()
        int     rl_show_char(int c)
message(FMT[, ...])
        int     rl_message(str fmt, ...)
        int     rl_crlf()                       # GRL 4.2
        int     rl_clear_message()
        void    rl_save_prompt()
        void    rl_restore_prompt()
        int     rl_expand_prompt(str prompt)    # GRL 4.2
        int     rl_set_prompt(const str prompt) # GRL 4.2
Modifying Text
        int     rl_insert_text(str text)
delete_text([START [,END]])
        int     rl_delete_text(int start = 0, int end = rl_end)
copy_text([START [,END]])
        str     rl_copy_text(int start = 0, int end = rl_end)
kill_text([START [,END]])
        int     rl_kill_text(int start = 0, int end = rl_end)
        int     rl_push_macro_input(str macro)
Character Input
        int     rl_read_key()
        int     rl_getc(FILE *STREAM)
        int     rl_stuff_char(int c)
        int     rl_execute_next(int c)          # GRL 4.2
        int     rl_clear_pending_input()        # GRL 4.2
        int     rl_set_keyboard_input_timeout(int usec) # GRL 4.2
Terminal Management
        void    rl_prep_terminal(int META_FLAG) # GRL 4.2
        void    rl_deprep_terminal()            # GRL 4.2
        void    rl_tty_set_default_bindings([Keymap KMAP])      # GRL 4.2
        void    rl_tty_unset_default_bindings([Keymap KMAP])    # GRL 5.0
        int     rl_reset_terminal(str terminal_name = getenv($TERM)) # GRL 4.2
Utility Functions
        int     rl_save_state(struct readline_state *sp)        # GRL 6.0
        int     rl_restore_state(struct readline_state *sp)     # GRL 6.0
replace_line(TEXT [,CLEAR_UNDO])
        int     rl_replace_line(str text, int clear_undo)       # GRL 4.3
        int     rl_initialize()
        int     rl_ding()
        int     rl_alphabetic(int C)
display_match_list(MATCHES [,LEN [,MAX]])
        void    rl_display_match_list(\@matches, len = $#maches, max) # GRL 4.0

Since the first element of an array @matches as treated as a possible completion, it is not displayed. See the descriptions of completion_matches().

When MAX is ommited, the max length of an item in @matches is used.

Miscellaneous Functions
macro_bind(KEYSEQ, MACRO [,MAP])
        int     rl_macro_bind(const str keyseq, const str macro, Keymap map)
        int     rl_macro_dumper(int readline)
variable_bind(VARIABLE, VALUE)
        int     rl_variable_bind(const str variable, const str value)
        str     rl_variable_value(const str variable)   # GRL 5.1
        int     rl_variable_dumper(int readline)
        int     rl_set_paren_blink_timeout(usec)        # GRL 4.2
        str     rl_get_termcap(cap)
Alternate Interface
callback_handler_install(PROMPT, LHANDLER)
        void    rl_callback_handler_install(str prompt, pfunc lhandler)
        void    rl_callback_read_char()
        void    rl_callback_handler_remove()
Readline Signal Handling
        void    rl_cleanup_after_signal()       # GRL 4.0
        void    rl_free_line_state()    # GRL 4.0
        void    rl_reset_after_signal() # GRL 4.0
        void    rl_echo_signal_char(int sig)    # GRL 6.0
        void    rl_resize_terminal()    # GRL 4.0
set_screen_size(ROWS, COLS)
        void    rl_set_screen_size(int ROWS, int COLS)  # GRL 4.2
        (int rows, int cols)    rl_get_screen_size()    # GRL 4.2
        void    rl_reset_screen_size()  # GRL 5.1
        int     rl_set_signals()        # GRL 4.0
        int     rl_clear_signals()      # GRL 4.0
Completion Functions
        int     rl_complete_internal(int what_to_do = TAB)
        int     rl_completion_mode(FunctionPtr|str function)
completion_matches(TEXT [,FUNC])
        (@str)  rl_completion_matches(str text,
                                      pfunc func = filename_completion_function)
filename_completion_function(TEXT, STATE)
        str     rl_filename_completion_function(str text, int state)
username_completion_function(TEXT, STATE)
        str     rl_username_completion_function(str text, int state)
list_completion_function(TEXT, STATE)
        str     list_completion_function(str text, int state)
History Functions
Initializing History and State Management
        void    using_history()
History List Management
addhistory(STRING[, STRING, ...])
        void    add_history(str string)
        int     stifle_history(int max|undef)

stifles the history list, remembering only the last MAX entries. If MAX is undef, remembers all entries. This is a replacement of unstifle_history().

        int     unstifle_history()

This is equivalent with 'stifle_history(undef)'.

SetHistory(LINE1 [, LINE2, ...])

sets the history of input, from where it can be used if the actual readline is present.

        void    add_history_time(str string)    # GRL 5.0
        str     remove_history(int which)
replace_history_entry(WHICH, LINE)
        str     replace_history_entry(int which, str line)
        void    clear_history()
        int     history_is_stifled()
Information About the History List
        int     where_history()
        str     current_history()
        str     history_get(offset)
        time_t  history_get_time(offset)
        int     history_total_bytes()

returns the history of input as a list, if actual readline is present.

Moving Around the History List
        int     history_set_pos(int pos)
        str     previous_history()
        str     next_history()
Searching the History List
history_search(STRING [,DIRECTION])
        int     history_search(str string, int direction = -1)
history_search_prefix(STRING [,DIRECTION])
        int     history_search_prefix(str string, int direction = -1)
history_search_pos(STRING [,DIRECTION [,POS]])
        int     history_search_pos(str string,
                                   int direction = -1,
                                   int pos = where_history())
Managing the History File
ReadHistory([FILENAME [,FROM [,TO]]])
        int     read_history(str filename = '~/.history',
                             int from = 0, int to = -1)

        int     read_history_range(str filename = '~/.history',
                                   int from = 0, int to = -1)

adds the contents of FILENAME to the history list, a line at a time. If FILENAME is false, then read from ~/.history. Start reading at line FROM and end at TO. If FROM is omitted or zero, start at the beginning. If TO is omitted or less than FROM, then read until the end of the file. Returns true if successful, or false if not. read_history() is an aliase of read_history_range().

        int     write_history(str filename = '~/.history')

writes the current history to FILENAME, overwriting FILENAME if necessary. If FILENAME is false, then write the history list to ~/.history. Returns true if successful, or false if not.

append_history(NELEMENTS [,FILENAME])
        int     append_history(int nelements, str filename = '~/.history')
history_truncate_file([FILENAME [,NLINES]])
        int     history_truncate_file(str filename = '~/.history',
                                      int nlines = 0)
History Expansion
        (int result, str expansion) history_expand(str line)

Note that this function returns expansion in scalar context.

get_history_event(STRING, CINDEX [,QCHAR])
        (str text, int cindex) = get_history_event(str  string,
                                                   int  cindex,
                                                   char qchar = '\0')
        (@str)  history_tokenize(str line)
history_arg_extract(LINE, [FIRST [,LAST]])
        str history_arg_extract(str line, int first = 0, int last = '$')

Term::ReadLine::Gnu Variables

Following GNU Readline/History Library variables can be accessed from Perl program. See 'GNU Readline Library Manual' and ' GNU History Library Manual' for each variable. You can access them with Attribs methods. Names of keys in this hash conform to standard conventions with the leading rl_ stripped.


    $attribs = $term->Attribs;
    $v = $attribs->{library_version};   # rl_library_version
    $v = $attribs->{history_base};      # history_base
Readline Variables
        str rl_line_buffer
        int rl_point
        int rl_end
        int rl_mark
        int rl_done
        int rl_num_chars_to_read (GRL 4.2)
        int rl_pending_input
        int rl_dispatching (GRL 4.2)
        int rl_erase_empty_line (GRL 4.0)
        str rl_prompt (read only)
        str rl_display_prompt (GRL 6.0)
        int rl_already_prompted (GRL 4.1)
        str rl_library_version (read only)
        int rl_readline_version (read only)
        int rl_gnu_readline_p (GRL 4.2)
        str rl_terminal_name
        str rl_readline_name
        filehandle rl_instream
        filehandle rl_outstream
        int rl_prefer_env_winsize (GRL 5.1)
        pfunc rl_last_func (GRL 4.2)
        pfunc rl_startup_hook
        pfunc rl_pre_input_hook (GRL 4.0)
        pfunc rl_event_hook
        pfunc rl_getc_function
        pfunc rl_redisplay_function
        pfunc rl_prep_term_function (GRL 4.2)
        pfunc rl_deprep_term_function (GRL 4.2)
        Keymap rl_executing_keymap (read only)
        Keymap rl_binding_keymap (read only)
        str rl_executing_macro (GRL 4.2)
        int rl_readline_state (GRL 4.2)
        int rl_explicit_arg (GRL 4.2)
        int rl_numeric_arg (GRL 4.2)
        int rl_editing_mode (GRL 4.2)
Signal Handling Variables
        int rl_catch_signals (GRL 4.0)
        int rl_catch_sigwinch (GRL 4.0)
Completion Variables
        pfunc rl_completion_entry_function
        pfunc rl_attempted_completion_function
        pfunc rl_filename_quoting_function
        pfunc rl_filename_dequoting_function
        pfunc rl_char_is_quoted_p
        int rl_completion_query_items
        str rl_basic_word_break_characters
        str rl_basic_quote_characters
        str rl_completer_word_break_characters
        pfunc rl_completion_word_break_hook (GRL 5.0)
        str rl_completer_quote_characters
        str rl_filename_quote_characters
        str rl_special_prefixes
        int rl_completion_append_character
        int rl_completion_suppress_append (GRL 4.3)
        int rl_completion_quote_charactor (GRL 5.0)
        int rl_completion_suppress_quote (GRL 5.0)
        int rl_completion_found_quote (GRL 5.0)
        int rl_completion_mark_symlink_dirs (GRL 4.3)
        int rl_ignore_completion_duplicates
        int rl_filename_completion_desired
        int rl_filename_quoting_desired
        int rl_attempted_completion_over (GRL 4.2)
        int rl_sort_completion_matches (GRL 6.0)
        int rl_completion_type (GRL 4.2)
        int rl_completion_invoking_key (GRL 6.0)
        int rl_inhibit_completion
        pfunc rl_ignore_some_completion_function
        pfunc rl_directory_completion_hook
        pfunc rl_completion_display_matches_hook (GRL 4.0)
History Variables
        int history_base
        int history_length
        int history_max_entries (called `max_input_history'. read only)
        int history_write_timestamps (GRL 5.0)
        char history_expansion_char
        char history_subst_char
        char history_comment_char
        str history_word_delimiters (GRL 4.2)
        str history_no_expand_chars
        str history_search_delimiter_chars
        int history_quotes_inhibit_expansion
        pfunc history_inhibit_expansion_function
Function References

Custom Completion

In this section variables and functions for custom completion is described with examples.

Most of descriptions in this section is cited from GNU Readline Library manual.


This variable holds reference refers to a generator function for completion_matches().

A generator function is called repeatedly from completion_matches(), returning a string each time. The arguments to the generator function are TEXT and STATE. TEXT is the partial word to be completed. STATE is zero the first time the function is called, allowing the generator to perform any necessary initialization, and a positive non-zero integer for each subsequent call. When the generator function returns undef this signals completion_matches() that there are no more possibilities left.

If the value is undef, built-in filename_completion_function is used.

A sample generator function, list_completion_function, is defined in You can use it as follows;

    use Term::ReadLine;
    my $term = new Term::ReadLine 'sample';
    my $attribs = $term->Attribs;
    $attribs->{completion_entry_function} =
    $attribs->{completion_word} =
        [qw(reference to a list of words which you want to use for completion)];
    $term->readline("custom completion>");

See also completion_matches.


A reference to an alternative function to create matches.

The function is called with TEXT, LINE_BUFFER, START, and END. LINE_BUFFER is a current input buffer string. START and END are indices in LINE_BUFFER saying what the boundaries of TEXT are.

If this function exists and returns null list or undef, or if this variable is set to undef, then an internal function rl_complete() will call the value of $rl_completion_entry_function to generate matches, otherwise the array of strings returned will be used.

The default value of this variable is undef. You can use it as follows;

    use Term::ReadLine;
    my $term = new Term::ReadLine 'sample';
    my $attribs = $term->Attribs;
    sub sample_completion {
        my ($text, $line, $start, $end) = @_;
        # If first word then username completion, else filename completion
        if (substr($line, 0, $start) =~ /^\s*$/) {
            return $term->completion_matches($text,
        } else {
            return ();
    $attribs->{attempted_completion_function} = \&sample_completion;
completion_matches(TEXT, ENTRY_FUNC)

Returns an array of strings which is a list of completions for TEXT. If there are no completions, returns undef. The first entry in the returned array is the substitution for TEXT. The remaining entries are the possible completions.

ENTRY_FUNC is a generator function which has two arguments, and returns a string. The first argument is TEXT. The second is a state argument; it is zero on the first call, and non-zero on subsequent calls. ENTRY_FUNC returns a undef to the caller when there are no more matches.

If the value of ENTRY_FUNC is undef, built-in filename_completion_function is used.

completion_matches is a Perl wrapper function of an internal function completion_matches(). See also $rl_completion_entry_function.


A variable whose content is a reference to a function which returns a list of candidates to complete.

This variable is compatible with Term::ReadLine::Perl and very easy to use.

    use Term::ReadLine;
    my $term = new Term::ReadLine 'sample';
    my $attribs = $term->Attribs;
    $attribs->{completion_function} = sub {
        my ($text, $line, $start) = @_;
        return qw(a list of candidates to complete);
list_completion_function(TEXT, STATE)

A sample generator function defined by Term::ReadLine::Gnu. Example code at rl_completion_entry_function shows how to use this function.

Term::ReadLine::Gnu Specific Features

Term::ReadLine::Gnu Specific Functions
CallbackHandlerInstall(PROMPT, LHANDLER)

This method provides the function rl_callback_handler_install() with the following addtional feature compatible with readline method; ornament feature, Term::ReadLine::Perl compatible completion function, histroy expansion, and addition to history buffer.

call_function(FUNCTION, [COUNT [,KEY]])
        int     rl_call_function(FunctionPtr|str function, count = 1, key = -1)

Returns a list of all function names.


A redisplay function for password input. You can use it as follows;

        $attribs->{redisplay_function} = $attribs->{shadow_redisplay};
        $line = $term->readline("password> ");

Returns candidates of filename to complete. This function can be used with completion_function and is implemented for the compatibility with Term::ReadLine::Perl.


See the description of section "Custom Completion".

Term::ReadLine::Gnu Specific Variables

When true, the history expansion is enabled. By default false.


See the description of section "Custom Completion".


A reference to a list of candidates to complete for list_completion_function.

Term::ReadLine::Gnu Specific Commands

The equivalent of the Bash history-expand-line editing command.


The equivalent of the Korn shell operate-and-get-next-history-line editing command and the Bash operate-and-get-next.

This command is bound to \C-o by default for the compatibility with the Bash and Term::ReadLine::Perl.


Shows the version of Term::ReadLine::Gnu and the one of the GNU Readline Library.


Change ornaments interactively.



Readline init file. Using this file it is possible that you would like to use a different set of key bindings. When a program which uses the Readline library starts up, the init file is read, and the key bindings are set.

Conditional key binding is also available. The program name which is specified by the first argument of new method is used as the application construct.

For example, when your program call new method like this;

        $term = new Term::ReadLine 'PerlSh';

your ~/.inputrc can define key bindings only for it as follows;

        $if PerlSh
        Meta-Rubout: backward-kill-word
        "\C-x\C-r": re-read-init-file
        "\e[11~": "Function Key 1"




GNU Readline Library Manual
GNU History Library Manual
Term::ReadLine::Perl (Term-ReadLine-Perl-xx.tar.gz)
eg/* and t/* in the Term::ReadLine::Gnu distribution
effective perl programming

This article demonstrates how to integrate Term::ReadLine::Gnu into an interactive command line program.

eijiro (Japanese)

A command line interface to Eijiro, Japanese-English dictionary service on WWW.

Works which use Term::ReadLine::Gnu
Perl Debugger
        perl -d
The Perl Shell (psh)

The Perl Shell is a shell that combines the interactive nature of a Unix shell with the power of Perl.

A programmable completion feature compatible with bash is implemented.

SPP (Synopsys Plus Perl)

SPP (Synopsys Plus Perl) is a Perl module that wraps around Synopsys' shell programs. SPP is inspired by the original dc_perl written by Steve Golson, but it's an entirely new implementation. Why is it called SPP and not dc_perl? Well, SPP was written to wrap around any of Synopsys' shells.

PFM (Personal File Manager for Unix/Linux)

Pfm is a terminal-based file manager written in Perl, based on PFM.COM for MS-DOS (originally by Paul Culley and Henk de Heer).

The soundgrab

soundgrab is designed to help you slice up a big long raw audio file (by default 44.1 kHz 2 channel signed sixteen bit little endian) and save your favorite sections to other files. It does this by providing you with a cassette player like command line interface.

PDL (The Perl Data Language)

PDL (``Perl Data Language'') gives standard Perl the ability to compactly store and speedily manipulate the large N-dimensional data arrays which are the bread and butter of scientific computing.

PIQT (Perl Interactive DBI Query Tool)

PIQT is an interactive query tool using the Perl DBI database interface. It supports ReadLine, provides a built in scripting language with a Lisp like syntax, an online help system, and uses wrappers to interface to the DBD modules.

Ghostscript Shell

It provides a friendly way to play with the Ghostscript interpreter, including command history and auto-completion of Postscript font names and reserved words.

vshnu (the New Visual Shell)

A visual shell and CLI shell supplement.

If you know any other works which can be listed here, please let me know.


Hiroo Hayashi <>


GTK+ support in addition to Tk.


rl_add_defun() can define up to 16 functions.

Ornament feature works only on prompt strings. It requires very hard hacking of display.c:rl_redisplay() in GNU Readline library to ornament input line.

newTTY() is not tested yet.