#
#       XS.pm : perl function definition for Term::ReadLine::Gnu
#
#       Copyright (c) 1999-2022 Hiroo Hayashi.  All rights reserved.
#
#       This program is free software; you can redistribute it and/or
#       modify it under the same terms as Perl itself.

package Term::ReadLine::Gnu::XS;

use Carp;
use strict;
use warnings;
use AutoLoader 'AUTOLOAD';

our $VERSION;
$VERSION='1.45';        # added for CPAN

# make aliases
our %Attribs;
*Attribs = \%Term::ReadLine::Gnu::Attribs;

#use vars qw(*read_history);
*read_history = \&read_history_range;

# alias for 8 characters limitation imposed by AutoSplit
#use vars qw(*rl_unbind_key *rl_unbind_function *rl_unbind_command
#           *history_list *history_arg_extract);
*rl_unbind_key = \&unbind_key;
*rl_unbind_function = \&unbind_function;
*rl_unbind_command = \&unbind_command;
*history_list = \&hist_list;
*history_arg_extract = \&hist_arg_extract;

# For backward compatibility.  Using these name (*_in_map) is deprecated.
#use vars qw(*rl_unbind_function_in_map *rl_unbind_command_in_map);
*rl_unbind_function_in_map = \&unbind_function;
*rl_unbind_command_in_map  = \&unbind_command;

rl_add_defun('history-expand-line',      \&history_expand_line);
rl_add_defun('display-readline-version', \&display_readline_version);
rl_add_defun('change-ornaments',         \&change_ornaments);

# for ornaments()

# Prompt-start, prompt-end, command-line-start, command-line-end
#     -- zero-width beautifies to emit around prompt and the command line.
# string encoded:
my $rl_term_set = ',,,';

# These variables are used by completion functions.  Don't use for
# other purpose.
my $_i;
my @_matches;
my @_tstrs;
my $_tstrs_init = 0;

1;

# Uncomment the following line to enable AutoSplit.  If you are using
# AutoLoader.pm distributed with Perl 5.004 or earlier, you must
# update AutoLoader.pm due to its bug.
# 2016/06/07: now it is time to uncomment. Ignore the warning message,
# "... some names are not unique ...", during make.

__END__


#
#       Readline Library function wrappers
#

# Convert keymap name to Keymap if the argument is not reference to Keymap
sub _str2map ($) {
    return ref $_[0] ? $_[0]
        : (rl_get_keymap_by_name($_[0]) || carp "unknown keymap name \`$_[0]\'\n");
}

# Convert function name to Function if the argument is not reference
# to Function
sub _str2fn ($) {
    return ref $_[0] ? $_[0]
        : (rl_named_function($_[0]) || carp "unknown function name \`$_[0]\'\n");
}

sub rl_copy_keymap ($)    { return _rl_copy_keymap(_str2map($_[0])); }
sub rl_discard_keymap ($) { return _rl_discard_keymap(_str2map($_[0])); }
sub rl_set_keymap ($)     { return _rl_set_keymap(_str2map($_[0])); }

# rl_bind_key
sub rl_bind_key ($$;$) {
    if (defined $_[2]) {
        return _rl_bind_key($_[0], _str2fn($_[1]), _str2map($_[2]));
    } else {
        return _rl_bind_key($_[0], _str2fn($_[1]));
    }
}

# rl_bind_key_if_unbound
sub rl_bind_key_if_unbound ($$;$) {
    my ($version) = $Attribs{library_version}
        =~ /(\d+\.\d+)/;
    if ($version < 5.0) {
        carp "rl_bind_key_if_unbound() is not supported.  Ignored\n";
        return;
    }
    if (defined $_[2]) {
        return _rl_bind_key_if_unbound($_[0], _str2fn($_[1]), _str2map($_[2]));
    } else {
        return _rl_bind_key_if_unbound($_[0], _str2fn($_[1]));
    }
}

# rl_unbind_key
sub unbind_key ($;$) {
    if (defined $_[1]) {
        return _rl_unbind_key($_[0], _str2map($_[1]));
    } else {
        return _rl_unbind_key($_[0]);
    }
}

# rl_unbind_function
sub unbind_function ($;$) {
    # libreadline.* in Debian GNU/Linux 2.0 tells wrong value as '2.1-bash'
    my ($version) = $Attribs{library_version}
        =~ /(\d+\.\d+)/;
    if ($version < 2.2) {
        carp "rl_unbind_function() is not supported.  Ignored\n";
        return;
    }
    if (defined $_[1]) {
        return _rl_unbind_function($_[0], _str2map($_[1]));
    } else {
        return _rl_unbind_function($_[0]);
    }
}

# rl_unbind_command
sub unbind_command ($;$) {
    my ($version) = $Attribs{library_version}
        =~ /(\d+\.\d+)/;
    if ($version < 2.2) {
        carp "rl_unbind_command() is not supported.  Ignored\n";
        return;
    }
    if (defined $_[1]) {
        return _rl_unbind_command($_[0], _str2map($_[1]));
    } else {
        return _rl_unbind_command($_[0]);
    }
}

# rl_bind_keyseq
sub rl_bind_keyseq ($$;$) {
    my ($version) = $Attribs{library_version}
        =~ /(\d+\.\d+)/;
    if ($version < 5.0) {
        carp "rl_bind_keyseq() is not supported.  Ignored\n";
        return;
    }
    if (defined $_[2]) {
        return _rl_bind_keyseq($_[0], _str2fn($_[1]), _str2map($_[2]));
    } else {
        return _rl_bind_keyseq($_[0], _str2fn($_[1]));
    }
}

sub rl_set_key ($$;$) {
    my ($version) = $Attribs{library_version}
        =~ /(\d+\.\d+)/;
    if ($version < 4.2) {
        carp "rl_set_key() is not supported.  Ignored\n";
        return;
    }
    if (defined $_[2]) {
        return _rl_set_key($_[0], _str2fn($_[1]), _str2map($_[2]));
    } else {
        return _rl_set_key($_[0], _str2fn($_[1]));
    }
}

# rl_bind_keyseq_if_unbound
sub rl_bind_keyseq_if_unbound ($$;$) {
    my ($version) = $Attribs{library_version}
        =~ /(\d+\.\d+)/;
    if ($version < 5.0) {
        carp "rl_bind_keyseq_if_unbound() is not supported.  Ignored\n";
        return;
    }
    if (defined $_[2]) {
        return _rl_bind_keyseq_if_unbound($_[0], _str2fn($_[1]), _str2map($_[2]));
    } else {
        return _rl_bind_keyseq_if_unbound($_[0], _str2fn($_[1]));
    }
}

sub rl_macro_bind ($$;$) {
    my ($version) = $Attribs{library_version}
        =~ /(\d+\.\d+)/;
    if (defined $_[2]) {
        return _rl_macro_bind($_[0], $_[1], _str2map($_[2]));
    } else {
        return _rl_macro_bind($_[0], $_[1]);
    }
}

sub rl_generic_bind ($$$;$) {
    if      ($_[0] == Term::ReadLine::Gnu::ISFUNC) {
        if (defined $_[3]) {
            _rl_generic_bind_function($_[1], _str2fn($_[2]), _str2map($_[3]));
        } else {
            _rl_generic_bind_function($_[1], _str2fn($_[2]));
        }
    } elsif ($_[0] == Term::ReadLine::Gnu::ISKMAP) {
        if (defined $_[3]) {
            _rl_generic_bind_keymap($_[1], _str2map($_[2]), _str2map($_[3]));
        } else {
            _rl_generic_bind_keymap($_[1], _str2map($_[2]));
        }
    } elsif ($_[0] == Term::ReadLine::Gnu::ISMACR) {
        if (defined $_[3]) {
            _rl_generic_bind_macro($_[1], $_[2], _str2map($_[3]));
        } else {
            _rl_generic_bind_macro($_[1], $_[2]);
        }
    } else {
        carp("Term::ReadLine::Gnu::rl_generic_bind: invalid \`type\'\n");
    }
}

sub rl_call_function ($;$$) {
    if (defined $_[2]) {
        return _rl_call_function(_str2fn($_[0]), $_[1], $_[2]);
    } elsif (defined $_[1]) {
        return _rl_call_function(_str2fn($_[0]), $_[1]);
    } else {
        return _rl_call_function(_str2fn($_[0]));
    }
}

sub rl_invoking_keyseqs ($;$) {
    if (defined $_[1]) {
        return _rl_invoking_keyseqs(_str2fn($_[0]), _str2map($_[1]));
    } else {
        return _rl_invoking_keyseqs(_str2fn($_[0]));
    }
}

sub rl_add_funmap_entry ($$) {
    my ($version) = $Attribs{library_version}
        =~ /(\d+\.\d+)/;
    if ($version < 4.2) {
        carp "rl_add_funmap_entry() is not supported.  Ignored\n";
        return;
    }
    return _rl_add_funmap_entry($_[0], _str2fn($_[1]));
}

sub rl_tty_set_default_bindings (;$) {
    my ($version) = $Attribs{library_version}
        =~ /(\d+\.\d+)/;
    if ($version < 4.2) {
        carp "rl_tty_set_default_bindings() is not supported.  Ignored\n";
        return;
    }
    if (defined $_[0]) {
        return _rl_tty_set_defaut_bindings(_str2map($_[1]));
    } else {
        return _rl_tty_set_defaut_bindings();
    }
}

sub rl_tty_unset_default_bindings (;$) {
    my ($version) = $Attribs{library_version}
        =~ /(\d+\.\d+)/;
    if ($version < 5.0) {
        carp "rl_tty_unset_default_bindings() is not supported.  Ignored\n";
        return;
    }
    if (defined $_[0]) {
        return _rl_tty_unset_defaut_bindings(_str2map($_[1]));
    } else {
        return _rl_tty_unset_defaut_bindings();
    }
}

sub rl_message {
    my $fmt = shift;
    my $line = sprintf($fmt, @_);
    _rl_message($line);
}

sub rl_completion_mode {
    # libreadline.* in Debian GNU/Linux 2.0 tells wrong value as '2.1-bash'
    my ($version) = $Attribs{library_version}
        =~ /(\d+\.\d+)/;
    if ($version < 4.3) {
        carp "rl_completion_mode() is not supported.  Ignored\n";
        return;
    }
    return _rl_completion_mode(_str2fn($_[0]));
}

#
#       for compatibility with Term::ReadLine::Perl
#
sub rl_filename_list {
    my ($text) = @_;

    # lcd : lowest common denominator
    my ($lcd, @matches) = rl_completion_matches($text,
                                                \&rl_filename_completion_function);
    return @matches ? @matches : $lcd;
}

#
#       History Library function wrappers
#
# history_list
sub hist_list () {
    my ($i, $history_base, $history_length, @d);
    $history_base   = $Attribs{history_base};
    $history_length = $Attribs{history_length};
    for ($i = $history_base; $i < $history_base + $history_length; $i++) {
        push(@d, history_get($i));
    }
    @d;
}

# history_arg_extract
sub hist_arg_extract ( ;$$$ ) {
    my ($line, $first, $last) = @_;
    $line  = $_      unless defined $line;
    $first = 0       unless defined $first;
    $last  = ord '$' unless defined $last; # '
    $first = ord '$' if defined $first and $first eq '$'; # '
    $last  = ord '$' if defined $last  and $last  eq '$'; # '
    &_history_arg_extract($line, $first, $last);
}

sub get_history_event ( $$;$ ) {
    _get_history_event($_[0], $_[1], defined $_[2] ? ord $_[2] : 0);
}

#
#       Ornaments
#

# This routine originates in Term::ReadLine.pm.

# Debian GNU/Linux discourages users from using /etc/termcap.  A
# subroutine ornaments() defined in Term::ReadLine.pm uses
# Term::Caps.pm which requires /etc/termcap.

# This module calls termcap (or its compatible) library, which the GNU
# Readline Library already uses, instead of Term::Caps.pm.

# Some terminals do not support 'ue' (underline end).
our %term_no_ue = ( kterm => 1 );

sub ornaments {
    return $rl_term_set unless @_;
    $rl_term_set = shift;
    $rl_term_set ||= ',,,';
    $rl_term_set = $term_no_ue{$ENV{TERM}} ? 'us,me,,' : 'us,ue,,'
        if $rl_term_set eq '1';
    my @ts = split /,/, $rl_term_set, 4;
    my @rl_term_set
        = map {
            # non-printing characters must be informed to readline
            my $t;
            ($_ and $t = tgetstr($_))
                ? (Term::ReadLine::Gnu::RL_PROMPT_START_IGNORE
                   . $t
                   . Term::ReadLine::Gnu::RL_PROMPT_END_IGNORE)
                    : '';
        } @ts;
    $Attribs{term_set} = \@rl_term_set;
    return $rl_term_set;
}

#
#       a sample custom function
#

# The equivalent of the Bash shell M-^ history-expand-line editing
# command.

# This routine was borrowed from bash.
sub history_expand_line {
    my ($count, $key) = @_;
    my ($expanded, $new_line) = history_expand($Attribs{line_buffer});
    if ($expanded > 0) {
        rl_modifying(0, $Attribs{end}); # save undo information
        $Attribs{line_buffer} = $new_line;
    } elsif ($expanded < 0) {
        my $OUT = $Attribs{outstream};
        print $OUT "\n$new_line\n";
        rl_on_new_line();
    }                           # $expanded == 0 : no change
}

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

# This routine was borrowed from bash.
sub operate_and_get_next {
    my ($count, $key) = @_;

    my $saved_history_line_to_use = -1;
    my $old_rl_startup_hook;

    # Accept the current line.
    rl_call_function('accept-line', 1, $key);

    # Find the current line, and find the next line to use. */
    my $where = where_history();
    if ((history_is_stifled()
         && ($Attribs{history_length} >= $Attribs{max_input_history}))
        || ($where >= $Attribs{history_length} - 1)) {
        $saved_history_line_to_use = $where;
    } else {
        $saved_history_line_to_use = $where + 1;
    }
    $old_rl_startup_hook = $Attribs{startup_hook};
    $Attribs{startup_hook} = sub {
        if ($saved_history_line_to_use >= 0) {
            rl_call_function('previous-history',
                             $Attribs{history_length}
                             - $saved_history_line_to_use,
                             0);
            $Attribs{startup_hook} = $old_rl_startup_hook;
            $saved_history_line_to_use = -1;
        }
    };
}

sub display_readline_version {  # show version
    my($count, $key) = @_;      # ignored in this function
    my $OUT = $Attribs{outstream};
    print $OUT
        ("\nTerm::ReadLine::Gnu version: $Term::ReadLine::Gnu::VERSION");
    print $OUT
        ("\nGNU Readline Library version: $Attribs{library_version}\n");
    rl_on_new_line();
}

# sample function of rl_message()
sub change_ornaments {
    my($count, $key) = @_;      # ignored in this function
    rl_save_prompt;
    rl_message("[S]tandout, [U]nderlining, [B]old, [R]everse, [V]isible bell: ");
    my $c = chr rl_read_key;
    if ($c =~ /s/i) {
        ornaments('so,me,,');
    } elsif ($c =~ /u/i) {
        ornaments('us,me,,');
    } elsif ($c =~ /b/i) {
        ornaments('md,me,,');
    } elsif ($c =~ /r/i) {
        ornaments('mr,me,,');
    } elsif ($c =~ /v/i) {
        ornaments('vb,,,');
    } else {
        rl_ding;
    }
    rl_restore_prompt;
    rl_clear_message;
}

#
#       for tkRunning
#
sub Tk_getc {
    &Term::ReadLine::Tk::Tk_loop
        if $Term::ReadLine::toloop && defined &Tk::DoOneEvent;
    my $FILE = $Attribs{instream};
    return rl_getc($FILE);
}

# redisplay function for secret input like password
# usage:
#       $a->{redisplay_function} = $a->{shadow_redisplay};
#       $line = $t->readline("password> ");
sub shadow_redisplay {
    @_tstrs = _tgetstrs() unless $_tstrs_init;
    # remove prompt start/end mark from prompt string
    my $prompt = $Attribs{prompt}; my $s;
    $s = Term::ReadLine::Gnu::RL_PROMPT_START_IGNORE; $prompt =~ s/$s//g;
    $s = Term::ReadLine::Gnu::RL_PROMPT_END_IGNORE;   $prompt =~ s/$s//g;
    my $OUT = $Attribs{outstream};
    my $oldfh = select($OUT); $| = 1; select($oldfh);
    print $OUT ($_tstrs[0],     # carriage return
                $_tstrs[1],     # clear to EOL
                $prompt, '*' x length($Attribs{line_buffer}));
    print $OUT ($_tstrs[2]      # cursor left
                x (length($Attribs{line_buffer}) - $Attribs{point}));
    $oldfh = select($OUT); $| = 0; select($oldfh);
}

sub _tgetstrs {
    my @s = (tgetstr('cr'),     # carriage return
             tgetstr('ce'),     # clear to EOL
             tgetstr('le'));    # cursor left
    warn <<"EOM" unless (defined($s[0]) && defined($s[1]) && defined($s[2]));
Your terminal 'TERM=$ENV{TERM}' does not support enough function.
Check if your environment variable 'TERM' is set correctly.
EOM
    # suppress warning "Use of uninitialized value in print at ..."
    $s[0] = $s[0] || ''; $s[1] = $s[1] || ''; $s[2] = $s[2] || '';
    $_tstrs_init = 1;
    return @s;
}

# callback handler wrapper function for CallbackHandlerInstall method
sub _ch_wrapper {
    my $line = shift;

    if (defined $line) {
        if ($Attribs{do_expand}) {
            my $result;
            ($result, $line) = history_expand($line);
            my $outstream = $Attribs{outstream};
            print $outstream "$line\n" if ($result);

            # return without adding line into history
            if ($result < 0 || $result == 2) {
                return '';      # don't return `undef' which means EOF.
            }
        }

        # add to history buffer
        add_history($line)
            if ($Attribs{MinLength} > 0
                && length($line) >= $Attribs{MinLength});
    }
    &{$Attribs{_callback_handler}}($line);
}

#
#       List Completion Function
#
sub list_completion_function ( $$ ) {
    my($text, $state) = @_;

    $_i = $state ? $_i + 1 : 0; # clear counter at the first call
    my $cw = $Attribs{completion_word};
    for (; $_i <= $#{$cw}; $_i++) {
        return $cw->[$_i] if ($cw->[$_i] =~ /^\Q$text/);
    }
    return undef;
}

#
#       wrapper completion function of 'completion_function'
#       for compatibility with Term::ReadLine::Perl
#
sub _trp_completion_function ( $$ ) {
    my($text, $state) = @_;

    my $cf;
    if (not defined ($cf = $Attribs{completion_function})) {
        carp "_trp_comletion_fuction: internal error\n";
        return undef;
    }

    if ($state) {
        $_i++;
    } else {
        # the first call
        $_i = 0;                # clear index
        @_matches = &$cf($text,
                         $Attribs{line_buffer},
                         $Attribs{point} - length($text));
        # return here since $#_matches is 0 instead of -1 when
        # @_matches = undef
        return undef unless defined $_matches[0];
    }

    for (; $_i <= $#_matches; $_i++) {
        # case insensitive match to be compatible with
        # Term::ReadLine::Perl.
        # https://rt.cpan.org/Ticket/Display.html?id=72378
        return $_matches[$_i] if ($_matches[$_i] =~ /^\Q$text/i);
    }
    return undef;
}

1;

__END__
