/
ReadLine.pm
3556 lines (3081 loc) · 101 KB
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ReadLine.pm
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package POE::Wheel::ReadLine;
use warnings;
use strict;
BEGIN { eval { require bytes } and bytes->import; }
use vars qw($VERSION);
$VERSION = '1.020'; # NOTE - Should be #.### (three decimal places)
use Carp qw( croak carp );
use Symbol qw(gensym);
use POE qw( Wheel );
use POSIX ();
if ($^O eq "MSWin32") {
die "$^O cannot run " . __PACKAGE__;
}
# Things we'll need to interact with the terminal.
use Term::Cap ();
use Term::ReadKey qw( ReadKey ReadMode GetTerminalSize );
my $initialised = 0;
my $termcap; # Termcap entry.
my $tc_bell; # How to ring the terminal.
my $tc_visual_bell; # How to ring the terminal.
my $tc_has_ce; # Termcap can clear to end of line.
# Private STDIN and STDOUT.
my $stdin = gensym();
open($stdin, "<&STDIN") or die "Can't open private STDIN: $!";
my $stdout = gensym;
open($stdout, ">&STDOUT") or die "Can't open private STDOUT: $!";
# Offsets into $self.
sub SELF_INPUT () { 0 }
sub SELF_CURSOR_INPUT () { 1 }
sub SELF_EVENT_INPUT () { 2 }
sub SELF_READING_LINE () { 3 }
sub SELF_STATE_READ () { 4 }
sub SELF_PROMPT () { 5 }
sub SELF_HIST_LIST () { 6 }
sub SELF_HIST_INDEX () { 7 }
sub SELF_INPUT_HOLD () { 8 }
sub SELF_KEY_BUILD () { 9 }
sub SELF_INSERT_MODE () { 10 }
sub SELF_PUT_MODE () { 11 }
sub SELF_PUT_BUFFER () { 12 }
sub SELF_IDLE_TIME () { 13 }
sub SELF_STATE_IDLE () { 14 }
sub SELF_HAS_TIMER () { 15 }
sub SELF_CURSOR_DISPLAY () { 16 }
sub SELF_UNIQUE_ID () { 17 }
sub SELF_KEYMAP () { 18 }
sub SELF_OPTIONS () { 19 }
sub SELF_APP () { 20 }
sub SELF_ALL_KEYMAPS () { 21 }
sub SELF_PENDING () { 22 }
sub SELF_COUNT () { 23 }
sub SELF_MARK () { 24 }
sub SELF_MARKLIST () { 25 }
sub SELF_KILL_RING () { 26 }
sub SELF_LAST () { 27 }
sub SELF_PENDING_FN () { 28 }
sub SELF_SOURCE () { 29 }
sub SELF_SEARCH () { 30 }
sub SELF_SEARCH_PROMPT () { 31 }
sub SELF_SEARCH_MAP () { 32 }
sub SELF_PREV_PROMPT () { 33 }
sub SELF_SEARCH_DIR () { 34 }
sub SELF_SEARCH_KEY () { 35 }
sub SELF_UNDO () { 36 }
sub CRIMSON_SCOPE_HACK ($) { 0 }
#------------------------------------------------------------------------------
# Build a hash of input characters and their "normalized" display
# versions. ISO Latin-1 characters (8th bit set "ASCII") are
# mishandled. European users, please forgive me. If there's a good
# way to handle this-- perhaps this is an interesting use for
# Unicode-- please let me know.
my (%normalized_character, @normalized_extra_width);
#------------------------------------------------------------------------------
# Gather information about the user's terminal. This just keeps
# getting uglier.
my $ospeed = undef;
my $termios = undef;
my $term = undef;
my $tc_left = undef;
my $trk_cols = undef;
my $trk_rows = undef;
sub _curs_left {
my $amount = shift;
if ($tc_left eq "LE") {
$termcap->Tgoto($tc_left, 1, $amount, $stdout);
return;
}
for (1..$amount) {
$termcap->Tgoto($tc_left, 1, 1, $stdout);
}
}
our $defuns = {
"abort" => \&rl_abort,
"accept-line" => \&rl_accept_line,
"backward-char" => \&rl_backward_char,
"backward-delete-char" => \&rl_backward_delete_char,
"backward-kill-line" => \&rl_unix_line_discard, # reuse emacs
"backward-kill-word" => \&rl_backward_kill_word,
"backward-word" => \&rl_backward_word,
"beginning-of-history" => \&rl_beginning_of_history,
"beginning-of-line" => \&rl_beginning_of_line,
"capitalize-word" => \&rl_capitalize_word,
"character-search" => \&rl_character_search,
"character-search-backward" => \&rl_character_search_backward,
"clear-screen" => \&rl_clear_screen,
"complete" => \&rl_complete,
"copy-region-as-kill" => \&rl_copy_region_as_kill,
"delete-char" => \&rl_delete_char,
"delete-horizontal-space" => \&rl_delete_horizontal_space,
"digit-argument" => \&rl_digit_argument,
"ding" => \&rl_ding,
"downcase-word" => \&rl_downcase_word,
"dump-key" => \&rl_dump_key,
"dump-macros" => \&rl_dump_macros,
"dump-variables" => \&rl_dump_variables,
"emacs-editing-mode" => \&rl_emacs_editing_mode,
"end-of-history" => \&rl_end_of_history,
"end-of-line" => \&rl_end_of_line,
"forward-char" => \&rl_forward_char,
"forward-search-history" => \&rl_forward_search_history,
"forward-word" => \&rl_forward_word,
"insert-comment" => \&rl_insert_comment,
"insert-completions" => \&rl_insert_completions,
"insert-macro" => \&rl_insert_macro,
"interrupt" => \&rl_interrupt,
"isearch-again" => \&rl_isearch_again,
"kill-line" => \&rl_kill_line,
"kill-region" => \&rl_kill_region,
"kill-whole-line" => \&rl_kill_whole_line,
"kill-word" => \&rl_kill_word,
"next-history" => \&rl_next_history,
"non-incremental-forward-search-history" => \&rl_non_incremental_forward_search_history,
"non-incremental-reverse-search-history" => \&rl_non_incremental_reverse_search_history,
"overwrite-mode" => \&rl_overwrite_mode,
"poe-wheel-debug" => \&rl_poe_wheel_debug,
"possible-completions" => \&rl_possible_completions,
"previous-history" => \&rl_previous_history,
"quoted-insert" => \&rl_quoted_insert,
"re-read-init-file" => \&rl_re_read_init_file,
"redraw-current-line" => \&rl_redraw_current_line,
"reverse-search-history" => \&rl_reverse_search_history,
"revert-line" => \&rl_revert_line,
"search-abort" => \&rl_search_abort,
"search-finish" => \&rl_search_finish,
"search-key" => \&rl_search_key,
"self-insert" => \&rl_self_insert,
"set-keymap" => \&rl_set_keymap,
"set-mark" => \&rl_set_mark,
"tab-insert" => \&rl_ding, # UNIMPLEMENTED
"tilde-expand" => \&rl_tilde_expand,
"transpose-chars" => \&rl_transpose_chars,
"transpose-words" => \&rl_transpose_words,
"undo" => \&rl_undo,
"unix-line-discard" => \&rl_unix_line_discard,
"unix-word-rubout" => \&rl_unix_word_rubout,
"upcase-word" => \&rl_upcase_word,
"vi-append-eol" => \&rl_vi_append_eol,
"vi-append-mode" => \&rl_vi_append_mode,
"vi-arg-digit" => \&rl_vi_arg_digit,
"vi-change-case" => \&rl_vi_change_case,
"vi-change-char" => \&rl_vi_change_char,
"vi-change-to" => \&rl_vi_change_to,
"vi-char-search" => \&rl_vi_char_search,
"vi-column" => \&rl_vi_column,
"vi-complete" => \&rl_vi_cmplete,
"vi-delete" => \&rl_vi_delete,
"vi-delete-to" => \&rl_vi_delete_to,
"vi-editing-mode" => \&rl_vi_editing_mode,
"vi-end-spec" => \&rl_vi_end_spec,
"vi-end-word" => \&rl_vi_end_word,
"vi-eof-maybe" => \&rl_vi_eof_maybe,
"vi-fetch-history" => \&rl_beginning_of_history, # re-use emacs version
"vi-first-print" => \&rl_vi_first_print,
"vi-goto-mark" => \&rl_vi_goto_mark,
"vi-insert-beg" => \&rl_vi_insert_beg,
"vi-insertion-mode" => \&rl_vi_insertion_mode,
"vi-match" => \&rl_vi_match,
"vi-movement-mode" => \&rl_vi_movement_mode,
"vi-next-word" => \&rl_vi_next_word,
"vi-prev-word" => \&rl_vi_prev_word,
"vi-put" => \&rl_vi_put,
"vi-redo" => \&rl_vi_redo,
"vi-replace" => \&rl_vi_replace,
"vi-search" => \&rl_vi_search,
"vi-search-accept" => \&rl_vi_search_accept,
"vi-search-again" => \&rl_vi_search_again,
"vi-search-key" => \&rl_vi_search_key,
"vi-set-mark" => \&rl_vi_set_mark,
"vi-spec-beginning-of-line" => \&rl_vi_spec_beginning_of_line,
"vi-spec-end-of-line" => \&rl_vi_spec_end_of_line,
"vi-spec-first-print" => \&rl_vi_spec_first_print,
"vi-spec-forward-char" => \&rl_vi_spec_forward_char,
"vi-spec-mark" => \&rl_vi_spec_mark,
"vi-spec-word" => \&rl_vi_spec_word,
"vi-subst" => \&rl_vi_subst,
"vi-tilde-expand" => \&rl_vi_tilde_expand,
"vi-undo" => \&rl_undo, # re-use emacs version
"vi-yank-arg" => \&rl_vi_yank_arg,
"vi-yank-to" => \&rl_vi_yank_to,
"yank" => \&rl_yank,
"yank-last-arg" => \&rl_yank_last_arg,
"yank-nth-arg" => \&rl_yank_nth_arg,
"yank-pop" => \&rl_yank_pop,
};
# what functions are for counting
my @fns_counting = (
'rl_vi_arg_digit',
'rl_digit_argument',
'rl_universal-argument',
);
# what functions are purely for movement...
my @fns_movement = (
'rl_beginning_of_line',
'rl_backward_char',
'rl_forward_char',
'rl_backward_word',
'rl_forward_word',
'rl_end_of_line',
'rl_character_search',
'rl_character_search_backward',
'rl_vi_prev_word',
'rl_vi_next_word',
'rl_vi_goto_mark',
'rl_vi_end_word',
'rl_vi_column',
'rl_vi_first_print',
'rl_vi_char_search',
'rl_vi_spec_char_search',
'rl_vi_spec_end_of_line',
'rl_vi_spec_beginning_of_line',
'rl_vi_spec_first_print',
'rl_vi_spec_word',
'rl_vi_spec_mark',
);
# the list of functions that we don't want to record for
# later redo usage in vi mode.
my @fns_anon = (
'rl_vi_redo',
@fns_counting,
@fns_movement,
);
my $defaults_inputrc = <<'INPUTRC';
set comment-begin #
INPUTRC
my $emacs_inputrc = <<'INPUTRC';
C-a: beginning-of-line
C-b: backward-char
C-c: interrupt
C-d: delete-char
C-e: end-of-line
C-f: forward-char
C-g: abort
C-h: backward-delete-char
C-i: complete
C-j: accept-line
C-k: kill-line
C-l: clear-screen
C-m: accept-line
C-n: next-history
C-p: previous-history
C-q: poe-wheel-debug
C-r: reverse-search-history
C-s: forward-search-history
C-t: transpose-chars
C-u: unix-line-discard
C-v: quoted-insert
C-w: unix-word-rubout
C-y: yank
C-]: character-search
C-_: undo
del: backward-delete-char
rubout: backward-delete-char
M-C-g: abort
M-C-h: backward-kill-word
M-C-i: tab-insert
M-C-j: vi-editing-mode
M-C-r: revert-line
M-C-y: yank-nth-arg
M-C-[: complete
M-C-]: character-search-backward
M-space: set-mark
M-#: insert-comment
M-&: tilde-expand
M-*: insert-completions
M--: digit-argument
M-.: yank-last-arg
M-0: digit-argument
M-1: digit-argument
M-2: digit-argument
M-3: digit-argument
M-4: digit-argument
M-5: digit-argument
M-6: digit-argument
M-7: digit-argument
M-8: digit-argument
M-9: digit-argument
M-<: beginning-of-history
M->: end-of-history
M-?: possible-completions
M-b: backward-word
M-c: capitalize-word
M-d: kill-word
M-f: forward-word
M-l: downcase-word
M-n: non-incremental-forward-search-history
M-p: non-incremental-reverse-search-history
M-r: revert-line
M-t: transpose-words
M-u: upcase-word
M-y: yank-pop
M-\: delete-horizontal-space
M-~: tilde-expand
M-del: backward-kill-word
M-_: yank-last-arg
C-xC-r: re-read-init-file
C-xC-g: abort
C-xDel: backward-kill-line
C-xm: dump-macros
C-xv: dump-variables
C-xk: dump-key
home: beginning-of-line
end: end-of-line
ins: overwrite-mode
del: delete-char
left: backward-char
right: forward-char
up: previous-history
down: next-history
bs: backward-delete-char
INPUTRC
my $vi_inputrc = <<'INPUTRC';
# VI uses two keymaps, depending on which mode we're in.
set keymap vi-insert
C-d: vi-eof-maybe
C-h: backward-delete-char
C-i: complete
C-j: accept-line
C-m: accept-line
C-r: reverse-search-history
C-s: forward-search-history
C-t: transpose-chars
C-u: unix-line-discard
C-v: quoted-insert
C-w: unix-word-rubout
C-y: yank
C-[: vi-movement-mode
C-_: undo
C-?: backward-delete-char
set keymap vi-command
C-d: vi-eof-maybe
C-e: emacs-editing-mode
C-g: abort
C-h: backward-char
C-j: accept-line
C-k: kill-line
C-l: clear-screen
C-m: accept-line
C-n: next-history
C-p: previous-history
C-q: quoted-insert
C-r: reverse-search-history
C-s: forward-search-history
C-t: transpose-chars
C-u: unix-line-discard
C-v: quoted-insert
C-w: unix-word-rubout
C-y: yank
C-_: vi-undo
" ": forward-char
"#": insert-comment
"$": end-of-line
"%": vi-match
"&": vi-tilde-expand
"*": vi-complete
"+": next-history
",": vi-char-search
"-": previous-history
".": vi-redo
"/": vi-search
"0": vi-arg-digit
"1": vi-arg-digit
"2": vi-arg-digit
"3": vi-arg-digit
"4": vi-arg-digit
"5": vi-arg-digit
"6": vi-arg-digit
"7": vi-arg-digit
"8": vi-arg-digit
"9": vi-arg-digit
";": vi-char-search
"=": vi-complete
"?": vi-search
A: vi-append-eol
B: vi-prev-word
C: vi-change-to
D: vi-delete-to
E: vi-end-word
F: vi-char-search
G: vi-fetch-history
I: vi-insert-beg
N: vi-search-again
P: vi-put
R: vi-replace
S: vi-subst
T: vi-char-search
U: revert-line
W: vi-next-word
X: backward-delete-char
Y: vi-yank-to
"\": vi-complete
"^": vi-first-print
"_": vi-yank-arg
"`": vi-goto-mark
a: vi-append-mode
b: backward-word
c: vi-change-to
d: vi-delete-to
e: vi-end-word
h: backward-char
i: vi-insertion-mode
j: next-history
k: previous-history
l: forward-char
m: vi-set-mark
n: vi-search-again
p: vi-put
r: vi-change-char
s: vi-subst
t: vi-char-search
w: vi-next-word
x: vi-delete
y: vi-yank-to
"|": vi-column
"~": vi-change-case
set keymap vi-specification
"^": vi-spec-first-print
"`": vi-spec-mark
"$": vi-spec-end-of-line
"0": vi-spec-beginning-of-line
"1": vi-arg-digit
"2": vi-arg-digit
"3": vi-arg-digit
"4": vi-arg-digit
"5": vi-arg-digit
"6": vi-arg-digit
"7": vi-arg-digit
"8": vi-arg-digit
"9": vi-arg-digit
w: vi-spec-word
t: vi-spec-forward-char
INPUTRC
my $search_inputrc = <<'INPUTRC';
set keymap isearch
C-r: isearch-again
C-s: isearch-again
set keymap vi-search
C-j: vi-search-accept
C-m: vi-search-accept
INPUTRC
#------------------------------------------------------------------------------
# Helper functions.
sub _vislength {
return 0 unless $_[0];
my $len = length($_[0]);
while ($_[0] =~ m{(\\\[.*?\\\])}g) {
$len -= length($1);
}
return $len;
}
# Wipe the current input line.
sub _wipe_input_line {
my ($self) = shift;
# Clear the current prompt and input, and home the cursor.
_curs_left( $self->[SELF_CURSOR_DISPLAY] + _vislength($self->[SELF_PROMPT]));
if ( $tc_has_ce ) {
print $stdout $termcap->Tputs( 'ce', 1 );
} else {
my $wlen = _vislength($self->[SELF_PROMPT]) + _display_width($self->[SELF_INPUT]);
print $stdout ( ' ' x $wlen);
_curs_left($wlen);
}
}
# Helper to flush any buffered output.
sub _flush_output_buffer {
my ($self) = shift;
# Flush anything buffered.
if ( @{ $self->[SELF_PUT_BUFFER] } ) {
print $stdout @{ $self->[SELF_PUT_BUFFER] };
# Do not change the interior arrayref, or the event handlers will
# become confused.
@{ $self->[SELF_PUT_BUFFER] } = ();
}
}
# Set up the prompt and input line like nothing happened.
sub _repaint_input_line {
my ($self) = shift;
my $sp = $self->[SELF_PROMPT];
$sp =~ s{\\[\[\]]}{}g;
print $stdout $sp, _normalize($self->[SELF_INPUT]);
if ( $self->[SELF_CURSOR_INPUT] != length( $self->[SELF_INPUT]) ) {
_curs_left(
_display_width($self->[SELF_INPUT]) - $self->[SELF_CURSOR_DISPLAY]
);
}
}
sub _clear_to_end {
my ($self) = @_;
if (length $self->[SELF_INPUT]) {
if ($tc_has_ce) {
print $stdout $termcap->Tputs( 'ce', 1 );
} else {
my $display_width = _display_width($self->[SELF_INPUT]);
print $stdout ' ' x $display_width;
_curs_left($display_width);
}
}
}
sub _delete_chars {
my ($self, $from, $howmany) = @_;
# sanitize input
if ($howmany < 0) {
$from -= $howmany;
$howmany = -$howmany;
if ($from < 0) {
$howmany -= $from;
$from = 0;
}
}
my $old = substr($self->[SELF_INPUT], $from, $howmany);
my $killed_width = _display_width($old);
substr($self->[SELF_INPUT], $from, $howmany) = '';
if ($self->[SELF_CURSOR_INPUT] > $from) {
my $newdisp = length(_normalize(substr($self->[SELF_INPUT], 0, $from)));
_curs_left($self->[SELF_CURSOR_DISPLAY] - $newdisp);
$self->[SELF_CURSOR_INPUT] = $from;
$self->[SELF_CURSOR_DISPLAY] = $newdisp;
}
my $normal_remaining = _normalize(substr($self->[SELF_INPUT], $from));
print $stdout $normal_remaining;
my $normal_remaining_length = length($normal_remaining);
if ($tc_has_ce) {
print $stdout $termcap->Tputs( 'ce', 1 );
} else {
print $stdout ' ' x $killed_width;
$normal_remaining_length += $killed_width;
}
_curs_left($normal_remaining_length)
if $normal_remaining_length;
return $old;
}
sub _search {
my ($self, $rebuild) = @_;
if ($rebuild) {
$self->_wipe_input_line;
$self->_build_search_prompt;
}
# find in history....
my $found = 0;
for (
my $i = $self->[SELF_HIST_INDEX];
$i < scalar @{$self->[SELF_HIST_LIST]} && $i >= 0;
$i += $self->[SELF_SEARCH_DIR]
) {
next unless $self->[SELF_HIST_LIST]->[$i] =~ /$self->[SELF_SEARCH]/;
$self->[SELF_HIST_INDEX] = $i;
$self->[SELF_INPUT] = $self->[SELF_HIST_LIST]->[$i];
$self->[SELF_CURSOR_INPUT] = 0;
$self->[SELF_CURSOR_DISPLAY] = 0;
$self->[SELF_UNDO] = [ $self->[SELF_INPUT], 0, 0 ]; # reset undo info
$found++;
last;
}
$self->rl_ding unless $found;
$self->_repaint_input_line;
}
# Return a normalized version of a string. This includes destroying
# 8th-bit-set characters, turning them into strange multi-byte
# sequences. Apologies to everyone; please let me know of a portable
# way to deal with this.
sub _normalize {
local $_ = shift;
s/([^ -~])/$normalized_character{$1}/g;
return $_;
}
sub _readable_key {
my ($raw_key) = @_;
my @text = ();
foreach my $l (split(//, $raw_key)) {
if (ord($l) == 0x1B) {
push(@text, 'Meta-');
next;
}
if (ord($l) < 32) {
push(@text, 'Control-' . chr(ord($l)+64));
next;
}
if (ord($l) > 127) {
my $l = ord($l)-128;
if ($l < 32) {
$l = "Control-" . chr($l+64);
}
push(@text, 'Meta-' . chr($l));
next;
}
if (ord($l) == 127) {
push @text, "^?";
next;
}
push(@text, $l);
}
return join("", @text);
}
# Calculate the display width of a string. The display width is
# sometimes wider than the actual string because some characters are
# represented on the terminal as multiple characters.
sub _display_width {
local $_ = shift;
my $width = length;
$width += $normalized_extra_width[ord] foreach (m/([\x00-\x1F\x7F-\xFF])/g);
return $width;
}
sub _build_search_prompt {
my ($self) = @_;
$self->[SELF_PROMPT] = $self->[SELF_SEARCH_PROMPT];
$self->[SELF_PROMPT] =~ s{%s}{$self->[SELF_SEARCH]};
}
sub _global_init {
return if $initialised;
# Get the terminal speed for Term::Cap.
$termios = POSIX::Termios->new();
$termios->getattr();
$ospeed = $termios->getospeed() || eval { POSIX::B38400() } || 0;
# Get the current terminal's capabilities.
$term = $ENV{TERM} || 'vt100';
$termcap = eval { Term::Cap->Tgetent( { TERM => $term, OSPEED => $ospeed } ) };
die "could not find termcap entry for ``$term'': $!" unless defined $termcap;
# Require certain capabilities.
$termcap->Trequire( qw( cl ku kd kl kr) );
# Cursor movement.
$tc_left = "LE";
eval { $termcap->Trequire($tc_left) };
if ($@) {
$tc_left = "le";
eval { $termcap->Trequire($tc_left) };
if ($@) {
# try out to see if we have a better terminfo defun.
# it may well not work (hence eval the lot), but it's worth a shot
eval {
my @tc = `infocmp -C $term`;
chomp(@tc);
splice(@tc, 0, 1); # remove header line
$ENV{TERMCAP} = join("", @tc);
$termcap = Term::Cap->Tgetent( { TERM => $term, OSPEED => $ospeed } );
$termcap->Trequire($tc_left);
};
}
die "POE::Wheel::ReadLine requires a termcap that supports LE or le" if $@;
}
# Terminal size.
# We initialize the values once on startup,
# and then from then on, we check them on every entry into
# the input state engine (so that we have valid values) and
# before handing control back to the user (so that they get
# an up-to-date value).
eval { ($trk_cols, $trk_rows) = GetTerminalSize($stdout) };
($trk_cols, $trk_rows) = (80, 25) if $@;
# Configuration...
# Some things are optional.
eval { $termcap->Trequire( 'ce' ) };
$tc_has_ce = 1 unless $@;
# o/` You can ring my bell, ring my bell. o/`
my $bell = $termcap->Tputs( bl => 1 );
$bell = $termcap->Tputs( vb => 1 ) unless defined $bell;
$tc_bell = (defined $bell) ? $bell : '';
$bell = $termcap->Tputs( vb => 1 ) || '';
$tc_visual_bell = $bell;
my $convert_meta = 1;
for (my $ord = 0; $ord < 256; $ord++) {
my $str = chr($ord);
if ($ord > 127) {
if ($convert_meta) {
$str = "^[";
if (($ord - 128) < 32) {
$str .= "^" . lc(chr($ord-128+64));
} else {
$str .= lc(chr($ord-128));
}
} else {
$str = sprintf "<%2x>", $ord;
}
} elsif ($ord < 32) {
$str = '^' . lc(chr($ord+64));
}
elsif ($ord == 127) {
$str = "^?";
}
$normalized_character{chr($ord)} = $str;
$normalized_extra_width[$ord] = length ( $str ) - 1;
}
$initialised++;
}
#------------------------------------------------------------------------------
# The methods themselves.
# Create a new ReadLine wheel.
sub new {
my $proto = shift;
my $class = ref($proto) || $proto;
my %params = @_;
croak "$class requires a working Kernel" unless defined $poe_kernel;
my $input_event = delete $params{InputEvent};
croak "$class requires an InputEvent parameter" unless defined $input_event;
my $put_mode = delete $params{PutMode};
$put_mode = 'idle' unless defined $put_mode;
croak "$class PutMode must be either 'immediate', 'idle', or 'after'"
unless $put_mode =~ /^(immediate|idle|after)$/;
my $idle_time = delete $params{IdleTime};
$idle_time = 2 unless defined $idle_time;
my $app = delete($params{AppName}) || delete($params{appname});
delete $params{appname}; # in case AppName was present
$app ||= 'poe-readline';
if (scalar keys %params) {
carp(
"unknown parameters in $class constructor call: ",
join(', ', keys %params)
);
}
my $self = undef;
if (ref $proto) {
$self = bless [], $class;
@$self = @$proto;
$self->[SELF_SOURCE] = $proto;
# ensure we're not bound to the old handler
$poe_kernel->select_read($stdin);
} else {
$self = bless [
'', # SELF_INPUT
0, # SELF_CURSOR_INPUT
$input_event, # SELF_EVENT_INPUT
0, # SELF_READING_LINE
undef, # SELF_STATE_READ
'>', # SELF_PROMPT
[ ], # SELF_HIST_LIST
0, # SELF_HIST_INDEX
'', # SELF_INPUT_HOLD
'', # SELF_KEY_BUILD
1, # SELF_INSERT_MODE
$put_mode, # SELF_PUT_MODE
[ ], # SELF_PUT_BUFFER
$idle_time, # SELF_IDLE_TIME
undef, # SELF_STATE_IDLE
0, # SELF_HAS_TIMER
0, # SELF_CURSOR_DISPLAY
&POE::Wheel::allocate_wheel_id(), # SELF_UNIQUE_ID
undef, # SELF_KEYMAP
{ }, # SELF_OPTIONS
$app, # SELF_APP
{}, # SELF_ALL_KEYMAPS
undef, # SELF_PENDING
0, # SELF_COUNT
0, # SELF_MARK
{}, # SELF_MARKLIST
[], # SELF_KILL_RING
'', # SELF_LAST
undef, # SELF_PENDING_FN
undef, # SELF_SOURCE
'', # SELF_SEARCH
undef, # SELF_SEARCH_PROMPT
undef, # SELF_SEARCH_MAP
'', # SELF_PREV_PROMPT
0, # SELF_SEARCH_DIR
'', # SELF_SEARCH_KEY
[], # SELF_UNDO
], $class;
_global_init();
$self->rl_re_read_init_file();
}
# Turn off $stdout buffering.
select((select($stdout), $| = 1)[0]);
# Set up the event handlers. Idle goes first.
$self->[SELF_STATE_IDLE] = (
ref($self) . "(" . $self->[SELF_UNIQUE_ID] . ") -> input timeout"
);
$poe_kernel->state($self->[SELF_STATE_IDLE], $self, '_idle_state');
$self->[SELF_STATE_READ] = (
ref($self) . "(" . $self->[SELF_UNIQUE_ID] . ") -> select read"
);
$poe_kernel->state($self->[SELF_STATE_READ], $self, '_read_state');
return $self;
}
#------------------------------------------------------------------------------
# Destroy the ReadLine wheel. Clean up the terminal.
sub DESTROY {
my $self = shift;
return unless $initialised;
# Stop selecting on the handle.
$poe_kernel->select($stdin);
# Detach our tentacles from the parent session.
if ($self->[SELF_STATE_READ]) {
$poe_kernel->state($self->[SELF_STATE_READ]);
$self->[SELF_STATE_READ] = undef;
}
if ($self->[SELF_STATE_IDLE]) {
$poe_kernel->alarm($self->[SELF_STATE_IDLE]);
$poe_kernel->state($self->[SELF_STATE_IDLE]);
$self->[SELF_STATE_IDLE] = undef;
}
# tell the terminal that we want to leave 'application' mode
print $termcap->Tputs('ke' => 1) if $termcap->Tputs('ke');
# Restore the console.
ReadMode('restore');
&POE::Wheel::free_wheel_id($self->[SELF_UNIQUE_ID]);
}
#------------------------------------------------------------------------------
# Redefine the idle handler. This also uses stupid closure tricks.
# See the comments for &_define_read_state for more information about
# these closure tricks.
sub _idle_state {
my ($self) = $_[OBJECT];
if (@{$self->[SELF_PUT_BUFFER]}) {
$self->_wipe_input_line;
$self->_flush_output_buffer;
$self->_repaint_input_line;
}
# No more timer.
$self->[SELF_HAS_TIMER] = 0;
}
sub _read_state {
my ($self, $k) = @_[OBJECT, KERNEL];
# Read keys, non-blocking, as long as there are some.
while (defined(my $raw_key = ReadKey(-1))) {
# Not reading a line; discard the input.
next unless $self->[SELF_READING_LINE];
# Update the timer on significant input.
if ( $self->[SELF_PUT_MODE] eq 'idle' ) {
$k->delay( $self->[SELF_STATE_IDLE], $self->[SELF_IDLE_TIME] );
$self->[SELF_HAS_TIMER] = 1;
}
push(
@{$self->[SELF_UNDO]}, [
$self->[SELF_INPUT],
$self->[SELF_CURSOR_INPUT],
$self->[SELF_CURSOR_DISPLAY]
]
);
# Build-multi character codes and make the keystroke printable.
$self->[SELF_KEY_BUILD] .= $raw_key;
$raw_key = $self->[SELF_KEY_BUILD];
my $key = _normalize($raw_key);
if ($self->[SELF_PENDING_FN]) {
my $old = $self->[SELF_INPUT];
my $oldref = $self->[SELF_PENDING_FN];
push(
@{$self->[SELF_UNDO]}, [
$old,
$self->[SELF_CURSOR_INPUT],
$self->[SELF_CURSOR_DISPLAY]
]
);
&{$self->[SELF_PENDING_FN]}($key, $raw_key);
pop(@{$self->[SELF_UNDO]}) if ($old eq $self->[SELF_INPUT]);
$self->[SELF_KEY_BUILD] = '';
if ($self->[SELF_PENDING_FN] && "$self->[SELF_PENDING_FN]" eq $oldref) {
$self->[SELF_PENDING_FN] = undef;
}
next;
}
# Keep glomming keystrokes until they stop existing in the
# hash of meta prefixes.
next if exists $self->[SELF_KEYMAP]->{prefix}->{$raw_key};
# PROCESS KEY
my $old = $self->[SELF_INPUT];
push(
@{$self->[SELF_UNDO]}, [
$old,
$self->[SELF_CURSOR_INPUT],
$self->[SELF_CURSOR_DISPLAY]
]
);
$self->[SELF_KEY_BUILD] = '';
$self->_apply_key($key, $raw_key);
pop(@{$self->[SELF_UNDO]}) if ($old eq $self->[SELF_INPUT]);
}
}
sub _apply_key {
my ($self, $key, $raw_key) = @_;
my $mapping = $self->[SELF_KEYMAP];
my $fn = $mapping->{default};
if (exists $mapping->{binding}->{$raw_key}) {
$fn = $mapping->{binding}->{$raw_key};
}