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#!/usr/bin/env perl
# $XTermId: xorblink.pl,v 1.15 2017/12/24 21:03:54 tom Exp $
# walk through the different states of cursor-blinking, with annotation
#
# Manual:
# +bc turn off text cursor blinking. This overrides the cursorBlink
# resource.
#
# -bc turn on text cursor blinking. This overrides the cursorBlink
# resource.
#
# cursorBlink (class CursorBlink)
# Specifies whether to make the cursor blink. The default is
# "false".
#
# Xterm-dev uses two variables to determine whether the cursor
# blinks. One is set by this resource. The other is set by
# control sequences (private mode 12 and DECSCUSR). Xterm-dev
# tests the XOR of the two variables.
#
# Enable Blinking Cursor (resource cursorblink)
# Enable (or disable) the blinking-cursor feature. This
# corresponds to the -bc option and the cursorBlink
# resource. There is also an escape sequence (see Xterm-
# dev Control Sequences). The menu entry and the escape
# sequence states are XOR'd: if both are enabled, the
# cursor will not blink, if only one is enabled, the cursor
# will blink.
#
# set-cursorblink(on/off/toggle)
# This action sets, unsets or toggles the cursorBlink resource.
# It is also invoked from the cursorblink entry in vtMenu.
#
# Control sequences:
#
# CSI ? Pm h
# DEC Private Mode Set (DECSET).
# Ps = 1 2 -> Start Blinking Cursor (att610).
#
# CSI ? Pm l
# DEC Private Mode Reset (DECRST).
# Ps = 1 2 -> Stop Blinking Cursor (att610).
#
# CSI Ps SP q
# Set cursor style (DECSCUSR, VT520).
# Ps = 0 -> blinking block.
# Ps = 1 -> blinking block (default).
# Ps = 2 -> steady block.
# Ps = 3 -> blinking underline.
# Ps = 4 -> steady underline.
# Ps = 5 -> blinking bar (xterm).
# Ps = 6 -> steady bar (xterm).
#
use strict;
use Term::ReadKey;
use IO::Handle;
STDERR->autoflush(1);
STDOUT->autoflush(1);
our %DECSET = (
"\e[?12h", "Start Blinking Cursor (AT&T 610)",
"\e[?12l", "Stop Blinking Cursor (AT&T 610)"
);
our %DECSCUSR = (
"\e[0 q",
"blinking block",
"\e[1 q",
"blinking block (default)",
"\e[2 q",
"steady block",
"\e[3 q",
"blinking underline",
"\e[4 q",
"steady underline",
"\e[5 q",
"blinking bar (xterm)",
"\e[6 q",
"steady bar (xterm)"
);
sub show($$) {
my $seq = shift;
my $txt = shift;
printf "%s -> %s\n", &visible($seq), $txt;
}
sub get_reply($$) {
my $seq = shift;
my $end = shift;
printf STDERR "%s", $seq;
my $key;
my $result = "";
$key = ReadKey(0);
$result .= $key;
if ( $key eq "\e" ) {
while (1) {
$key = ReadKey(100);
$result .= $key;
next if ( length($result) < length($end) );
last if ( substr( $result, -length($end) ) eq $end );
}
}
return $result;
}
sub mode_value($) {
my $value = shift;
if ( $value eq 1 ) {
$value = "set";
}
elsif ( $value eq 2 ) {
$value = "reset";
}
elsif ( $value eq 3 ) {
$value = "*set";
}
elsif ( $value eq 4 ) {
$value = "*reset";
}
else {
$value = &visible( "?" . $value );
}
return $value;
}
sub DECRQM($) {
my $mode = shift;
my $sequence = sprintf( "\e[?%d\$p", $mode );
my $reply = &get_reply( $sequence, "y" );
if ( $reply =~ /^\e\[\?$mode;\d+\$y$/ ) {
$reply =~ s/^\e\[\?$mode;(\d+)\$y$/$1/;
}
return &mode_value($reply);
}
sub DECRQSS($) {
my $request = shift;
my $ending = "\e\\";
my $sequence = sprintf( "\eP\$q%s$ending", $request );
my $reply = &get_reply( $sequence, $ending );
# xterm responds with
# DCS 1 $ r Pt ST for valid requests,
# DCS 0 $ r Pt ST for invalid requests.
#if ( $reply =~ /^\eP1\$r.*$ending$/ ) {
if ( $reply =~ /^\eP1\$r\d+ q\e\\$/ ) {
$reply =~ s/^\eP1\$r(\d+) q\e\\$/$1/;
}
return &visible($reply);
}
sub get_key() {
my $key;
do {
$key = ReadKey(0);
if ( $key eq "\e" ) {
while ( ReadKey(10) !~ /[@-~]/ ) {
#
}
}
} while ( $key eq "\e" );
return $key;
}
sub visible($) {
my $txt = shift;
$txt =~ s/\e/\\e/g;
$txt =~ s/\a/\\a/g;
return $txt;
}
sub test($$) {
my $set = shift;
my $msg = shift;
ReadMode 'raw';
printf STDERR "%s\t[", &visible($set);
# save the cursor position
printf STDERR "\e7";
# send the escape sequence
printf STDERR "%s", $set;
# print the description
printf STDERR "X] ";
printf STDERR " [C=%s,", &DECRQSS(" q");
printf STDERR "B=%s,", &DECRQM(12);
printf STDERR "M=%s,%s]", &DECRQM(13), &DECRQM(14);
printf STDERR " %s", $msg;
printf STDERR "\e[0J";
# restore the cursor position
printf STDERR "\e8";
# wait for any key
my $key = &get_key;
ReadMode 'restore';
# print newline
printf STDERR "\n";
# A backspace response makes the current line reprint (to test menus)
return ( $key ne "\b" and $key ne "\177" ) ? 1 : 0;
}
if ( -t STDOUT ) {
printf "Legend:\n";
printf " C = cursor shape (1,2 block, 3,4 underline, 5,6 left-bar)\n";
printf " B = escape-sequence blink\n";
printf " M = menu blink and XOR mode\n";
printf "\n";
printf "An asterisk means the mode is always set or reset.\n";
printf "Press any key to proceed; press backspace to reprint line.\n";
printf "\n";
my @DECSET = sort keys %DECSET;
my @DECSCUSR = sort keys %DECSCUSR;
for ( my $h = 0 ; $h <= $#DECSET ; ++$h ) {
$h-- unless &test( $DECSET[$h], $DECSET{ $DECSET[$h] } );
}
for my $l ( 0 .. $#DECSCUSR ) {
$l-- unless &test( $DECSCUSR[$l], $DECSCUSR{ $DECSCUSR[$l] } );
}
}
else {
printf "DECSET (AT&T 610 blinking cursor):\n";
for my $key ( sort keys %DECSET ) {
&show( $key, $DECSET{$key} );
}
printf "DECSCUSR:\n";
for my $key ( sort keys %DECSCUSR ) {
&show( $key, $DECSCUSR{$key} );
}
}
1;
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