/usr/bin/xscreensaver-text is in xscreensaver-data 5.15-2ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# Copyright © 2005-2011 Jamie Zawinski <jwz@jwz.org>
#
# Permission to use, copy, modify, distribute, and sell this software and its
# documentation for any purpose is hereby granted without fee, provided that
# the above copyright notice appear in all copies and that both that
# copyright notice and this permission notice appear in supporting
# documentation. No representations are made about the suitability of this
# software for any purpose. It is provided "as is" without express or
# implied warranty.
#
# This program writes some text to stdout, based on preferences in the
# .xscreensaver file. It may load a file, a URL, run a program, or just
# print the date.
#
# In a native MacOS build of xscreensaver, this script is included in
# the Contents/Resources/ directory of each screen saver .bundle that
# uses it; and in that case, it looks up its resources using
# /usr/bin/defaults instead.
#
# Created: 19-Mar-2005.
require 5;
#use diagnostics; # Fails on some MacOS 10.5 systems
use strict;
use Socket;
use POSIX qw(strftime);
use Text::Wrap qw(wrap);
use bytes;
my $progname = $0; $progname =~ s@.*/@@g;
my $version = q{ $Revision: 1.24 $ }; $version =~ s/^[^0-9]+([0-9.]+).*$/$1/;
my $verbose = 0;
my $http_proxy = undef;
my $config_file = $ENV{HOME} . "/.xscreensaver";
my $text_mode = 'date';
my $text_literal = '';
my $text_file = '';
my $text_program = '';
my $text_url = '';
my $wrap_columns = undef;
my $nyarlathotep_p = 0;
# Maps HTML character entities to the corresponding Latin1 characters.
#
my %entity_table = (
"quot" => '"', "amp" => '&', "lt" => '<', "gt" => '>',
"nbsp" => ' ', "iexcl" => '¡', "cent" => '¢', "pound" => '£',
"curren" => '¤', "yen" => '¥', "brvbar" => '¦', "sect" => '§',
"uml" => '¨', "copy" => '©', "ordf" => 'ª', "laquo" => '«',
"not" => '¬', "shy" => '', "reg" => '®', "macr" => '¯',
"deg" => '°', "plusmn" => '±', "sup2" => '²', "sup3" => '³',
"acute" => '´', "micro" => 'µ', "para" => '¶', "middot" => '·',
"cedil" => '¸', "sup1" => '¹', "ordm" => 'º', "raquo" => '»',
"frac14" => '¼', "frac12" => '½', "frac34" => '¾', "iquest" => '¿',
"Agrave" => 'À', "Aacute" => 'Á', "Acirc" => 'Â', "Atilde" => 'Ã',
"Auml" => 'Ä', "Aring" => 'Å', "AElig" => 'Æ', "Ccedil" => 'Ç',
"Egrave" => 'È', "Eacute" => 'É', "Ecirc" => 'Ê', "Euml" => 'Ë',
"Igrave" => 'Ì', "Iacute" => 'Í', "Icirc" => 'Î', "Iuml" => 'Ï',
"ETH" => 'Ð', "Ntilde" => 'Ñ', "Ograve" => 'Ò', "Oacute" => 'Ó',
"Ocirc" => 'Ô', "Otilde" => 'Õ', "Ouml" => 'Ö', "times" => '×',
"Oslash" => 'Ø', "Ugrave" => 'Ù', "Uacute" => 'Ú', "Ucirc" => 'Û',
"Uuml" => 'Ü', "Yacute" => 'Ý', "THORN" => 'Þ', "szlig" => 'ß',
"agrave" => 'à', "aacute" => 'á', "acirc" => 'â', "atilde" => 'ã',
"auml" => 'ä', "aring" => 'å', "aelig" => 'æ', "ccedil" => 'ç',
"egrave" => 'è', "eacute" => 'é', "ecirc" => 'ê', "euml" => 'ë',
"igrave" => 'ì', "iacute" => 'í', "icirc" => 'î', "iuml" => 'ï',
"eth" => 'ð', "ntilde" => 'ñ', "ograve" => 'ò', "oacute" => 'ó',
"ocirc" => 'ô', "otilde" => 'õ', "ouml" => 'ö', "divide" => '÷',
"oslash" => 'ø', "ugrave" => 'ù', "uacute" => 'ú', "ucirc" => 'û',
"uuml" => 'ü', "yacute" => 'ý', "thorn" => 'þ', "yuml" => 'ÿ',
"apos" => '\'',
# HTML 4 entities that do not have 1:1 Latin1 mappings.
"bull" => "*", "hellip"=> "...", "prime" => "'", "Prime" => "\"",
"frasl" => "/", "trade" => "[tm]", "larr" => "<-", "rarr" => "->",
"harr" => "<->", "lArr" => "<=", "rArr" => "=>", "hArr" => "<=>",
"empty" => "Ø", "minus" => "-", "lowast"=> "*", "sim" => "~",
"cong" => "=~", "asymp" => "~", "ne" => "!=", "equiv" => "==",
"le" => "<=", "ge" => ">=", "lang" => "<", "rang" => ">",
"loz" => "<>", "OElig" => "OE", "oelig" => "oe", "Yuml" => "Y",
"circ" => "^", "tilde" => "~", "ensp" => " ", "emsp" => " ",
"thinsp"=> " ", "ndash" => "-", "mdash" => "-", "lsquo" => "`",
"rsquo" => "'", "sbquo" => "'", "ldquo" => "\"", "rdquo" => "\"",
"bdquo" => "\"", "lsaquo"=> "<", "rsaquo"=> ">",
);
# Maps certain UTF8 characters (2 or 3 bytes) to the corresponding
# Latin1 characters.
#
my %unicode_latin1_table = (
"\xC2\xA1" => '¡', "\xC2\xA2" => '¢', "\xC2\xA3" => '£', "\xC2\xA4" => '¤',
"\xC2\xA5" => '¥', "\xC2\xA6" => '¦', "\xC2\xA7" => '§', "\xC2\xA8" => '¨',
"\xC2\xA9" => '©', "\xC2\xAA" => 'ª', "\xC2\xAB" => '«', "\xC2\xAC" => '¬',
"\xC2\xAD" => '', "\xC2\xAE" => '®', "\xC2\xAF" => '¯', "\xC2\xB0" => '°',
"\xC2\xB1" => '±', "\xC2\xB2" => '²', "\xC2\xB3" => '³', "\xC2\xB4" => '´',
"\xC2\xB5" => 'µ', "\xC2\xB6" => '¶', "\xC2\xB7" => '·', "\xC2\xB8" => '¸',
"\xC2\xB9" => '¹', "\xC2\xBA" => 'º', "\xC2\xBB" => '»', "\xC2\xBC" => '¼',
"\xC2\xBD" => '½', "\xC2\xBE" => '¾', "\xC2\xBF" => '¿', "\xC3\x80" => 'À',
"\xC3\x81" => 'Á', "\xC3\x82" => 'Â', "\xC3\x83" => 'Ã', "\xC3\x84" => 'Ä',
"\xC3\x85" => 'Å', "\xC3\x86" => 'Æ', "\xC3\x87" => 'Ç', "\xC3\x88" => 'È',
"\xC3\x89" => 'É', "\xC3\x8A" => 'Ê', "\xC3\x8B" => 'Ë', "\xC3\x8C" => 'Ì',
"\xC3\x8D" => 'Í', "\xC3\x8E" => 'Î', "\xC3\x8F" => 'Ï', "\xC3\x90" => 'Ð',
"\xC3\x91" => 'Ñ', "\xC3\x92" => 'Ò', "\xC3\x93" => 'Ó', "\xC3\x94" => 'Ô',
"\xC3\x95" => 'Õ', "\xC3\x96" => 'Ö', "\xC3\x97" => '×', "\xC3\x98" => 'Ø',
"\xC3\x99" => 'Ù', "\xC3\x9A" => 'Ú', "\xC3\x9B" => 'Û', "\xC3\x9C" => 'Ü',
"\xC3\x9D" => 'Ý', "\xC3\x9E" => 'Þ', "\xC3\x9F" => 'ß', "\xC3\xA0" => 'à',
"\xC3\xA1" => 'á', "\xC3\xA2" => 'â', "\xC3\xA3" => 'ã', "\xC3\xA4" => 'ä',
"\xC3\xA5" => 'å', "\xC3\xA6" => 'æ', "\xC3\xA7" => 'ç', "\xC3\xA8" => 'è',
"\xC3\xA9" => 'é', "\xC3\xAA" => 'ê', "\xC3\xAB" => 'ë', "\xC3\xAC" => 'ì',
"\xC3\xAD" => 'í', "\xC3\xAE" => 'î', "\xC3\xAF" => 'ï', "\xC3\xB0" => 'ð',
"\xC3\xB1" => 'ñ', "\xC3\xB2" => 'ò', "\xC3\xB3" => 'ó', "\xC3\xB4" => 'ô',
"\xC3\xB5" => 'õ', "\xC3\xB6" => 'ö', "\xC3\xB7" => '÷', "\xC3\xB8" => 'ø',
"\xC3\xB9" => 'ù', "\xC3\xBA" => 'ú', "\xC3\xBB" => 'û', "\xC3\xBC" => 'ü',
"\xC3\xBD" => 'ý', "\xC3\xBE" => 'þ', "\xC3\xBF" => 'ÿ',
"\xE2\x80\x93" => '--', "\xE2\x80\x94" => '--',
"\xE2\x80\x98" => '`', "\xE2\x80\x99" => '\'',
"\xE2\x80\x9C" => "``", "\xE2\x80\x9D" => "''",
"\xE2\x80\xA6" => '...',
);
# Convert any HTML entities to Latin1 characters.
#
sub de_entify($) {
my ($text) = @_;
$text =~ s/(&(\#)?([[:alpha:]\d]+);?)/
{
my $c = $3;
if (! defined($2)) {
$c = $entity_table{$c}; # for Á
} else {
if ($c =~ m@^x([\dA-F]+)$@si) { # for A
$c = chr(hex($1));
} elsif ($c =~ m@^\d+$@si) { # for A
$c = chr($c);
} else {
$c = undef;
}
}
($c || "[$3]"); # for &unknown; => "[unknown]"
}
/gexi;
return $text;
}
# Convert any Unicode characters to Latin1 if possible.
# Unconvertable bytes are left alone.
#
sub de_unicoddle($) {
my ($text) = @_;
foreach my $key (keys (%unicode_latin1_table)) {
my $val = $unicode_latin1_table{$key};
$text =~ s/$key/$val/gs;
}
return $text;
}
# Reads the prefs we use from ~/.xscreensaver
#
sub get_x11_prefs() {
my $got_any_p = 0;
local *IN;
if (open (IN, "<$config_file")) {
print STDERR "$progname: reading $config_file\n" if ($verbose > 1);
my $body = '';
while (<IN>) { $body .= $_; }
close IN;
$got_any_p = get_x11_prefs_1 ($body);
} elsif ($verbose > 1) {
print STDERR "$progname: $config_file: $!\n";
}
if (! $got_any_p && defined ($ENV{DISPLAY})) {
# We weren't able to read settings from the .xscreensaver file.
# Fall back to any settings in the X resource database
# (/usr/X11R6/lib/X11/app-defaults/XScreenSaver)
#
print STDERR "$progname: reading X resources\n" if ($verbose > 1);
my $body = `appres XScreenSaver xscreensaver -1`;
$got_any_p = get_x11_prefs_1 ($body);
}
if ($verbose > 1) {
printf STDERR "$progname: mode: $text_mode\n";
printf STDERR "$progname: literal: $text_literal\n";
printf STDERR "$progname: file: $text_file\n";
printf STDERR "$progname: program: $text_program\n";
printf STDERR "$progname: url: $text_url\n";
}
$text_mode =~ tr/A-Z/a-z/;
$text_literal =~ s@\\n@\n@gs;
}
sub get_x11_prefs_1($) {
my ($body) = @_;
my $got_any_p = 0;
$body =~ s@\\\n@@gs;
if ($body =~ m/^[.*]*textMode:[ \t]*([^\s]+)\s*$/im) {
$text_mode = $1;
$got_any_p = 1;
}
if ($body =~ m/^[.*]*textLiteral:[ \t]*(.*?)[ \t]*$/im) {
$text_literal = $1;
}
if ($body =~ m/^[.*]*textFile:[ \t]*(.*?)[ \t]*$/im) {
$text_file = $1;
}
if ($body =~ m/^[.*]*textProgram:[ \t]*(.*?)[ \t]*$/im) {
$text_program = $1;
}
if ($body =~ m/^[.*]*textURL:[ \t]*(.*?)[ \t]*$/im) {
$text_url = $1;
}
return $got_any_p;
}
sub get_cocoa_prefs($) {
my ($id) = @_;
my $v;
print STDERR "$progname: reading Cocoa prefs: \"$id\"\n" if ($verbose > 1);
$v = get_cocoa_pref_1 ($id, "textMode");
$text_mode = $v if defined ($v);
# The "textMode" pref is set to a number instead of a string because I
# can't figure out the black magic to make Cocoa bindings work right.
#
if ($text_mode eq '0') { $text_mode = 'date'; }
elsif ($text_mode eq '1') { $text_mode = 'literal'; }
elsif ($text_mode eq '2') { $text_mode = 'file'; }
elsif ($text_mode eq '3') { $text_mode = 'url'; }
elsif ($text_mode eq '4') { $text_mode = 'program'; }
$v = get_cocoa_pref_1 ($id, "textLiteral");
$text_literal = $v if defined ($v);
$v = get_cocoa_pref_1 ($id, "textFile");
$text_file = $v if defined ($v);
$v = get_cocoa_pref_1 ($id, "textProgram");
$text_program = $v if defined ($v);
$v = get_cocoa_pref_1 ($id, "textURL");
$text_url = $v if defined ($v);
}
sub get_cocoa_pref_1($$) {
my ($id, $key) = @_;
# make sure there's nothing stupid/malicious in either string.
$id =~ s/[^-a-z\d. ]/_/gsi;
$key =~ s/[^-a-z\d. ]/_/gsi;
my $cmd = "defaults -currentHost read \"$id\" \"$key\"";
print STDERR "$progname: executing $cmd\n"
if ($verbose > 3);
my $val = `$cmd 2>/dev/null`;
$val =~ s/^\s+//s;
$val =~ s/\s+$//s;
print STDERR "$progname: Cocoa: $id $key = \"$val\"\n"
if ($verbose > 2);
$val = undef if ($val =~ m/^$/s);
return $val;
}
# like system() but checks errors.
#
sub safe_system(@) {
my (@cmd) = @_;
print STDERR "$progname: executing " . join(' ', @cmd) . "\n"
if ($verbose > 3);
system @cmd;
my $exit_value = $? >> 8;
my $signal_num = $? & 127;
my $dumped_core = $? & 128;
error ("$cmd[0]: core dumped!") if ($dumped_core);
error ("$cmd[0]: signal $signal_num!") if ($signal_num);
error ("$cmd[0]: exited with $exit_value!") if ($exit_value);
}
sub which($) {
my ($cmd) = @_;
if ($cmd =~ m@^\./|^/@) {
error ("cannot execute $cmd") unless (-x $cmd);
return $cmd;
}
foreach my $dir (split (/:/, $ENV{PATH})) {
my $cmd2 = "$dir/$cmd";
print STDERR "$progname: checking $cmd2\n" if ($verbose > 3);
return $cmd2 if (-x "$cmd2");
}
error ("$cmd not found on \$PATH");
}
sub output() {
# Do some basic sanity checking (null text, null file names, etc.)
#
if (($text_mode eq 'literal' && $text_literal =~ m/^\s*$/i) ||
($text_mode eq 'file' && $text_file =~ m/^\s*$/i) ||
($text_mode eq 'program' && $text_program =~ m/^\s*$/i) ||
($text_mode eq 'url' && $text_url =~ m/^\s*$/i)) {
print STDERR "$progname: falling back to 'date'\n" if ($verbose);
$text_mode = 'date';
}
if ($text_mode eq 'literal') {
$text_literal = strftime ($text_literal, localtime);
$text_literal =~ y/A-Za-z/N-ZA-Mn-za-m/ if ($nyarlathotep_p);
print STDOUT $text_literal;
print STDOUT "\n" unless ($text_literal =~ m/\n$/s);
} elsif ($text_mode eq 'file') {
$text_file =~ s@^~/@$ENV{HOME}/@s; # allow literal "~/"
local *IN;
if (open (IN, "<$text_file")) {
print STDERR "$progname: reading $text_file\n" if ($verbose);
if ($wrap_columns && $wrap_columns > 0) {
# read it, then reformat it.
my $body = '';
while (<IN>) { $body .= $_; }
reformat_text ($body);
} else {
# stream it
while (<IN>) {
y/A-Za-z/N-ZA-Mn-za-m/ if ($nyarlathotep_p);
print $_;
}
}
close IN;
} else {
error ("$text_file: $!");
}
} elsif ($text_mode eq 'program') {
my ($prog, $args) = ($text_program =~ m/^([^\s]+)(.*)$/);
$text_program = which ($prog) . $args;
print STDERR "$progname: running $text_program\n" if ($verbose);
if ($wrap_columns && $wrap_columns > 0) {
# read it, then reformat it.
my $body = `( $text_program ) 2>&1`;
reformat_text ($body);
} else {
# stream it
safe_system ("$text_program");
}
} elsif ($text_mode eq 'url') {
get_url_text ($text_url);
} else { # $text_mode eq 'date'
my $n = `uname -n`;
$n =~ s/\.local\n/\n/s;
print $n;
my $unamep = 1;
if (-f "/etc/redhat-release") { # "Fedora Core release 4 (Stentz)"
safe_system ("cat", "/etc/redhat-release");
}
if (-f "/etc/release") { # "Solaris 10 3/05 s10_74L2a X86"
safe_system ("head", "-1", "/etc/release");
}
if (-f "/usr/sbin/system_profiler") { # "Mac OS X 10.4.5 (8H14)"
my $sp = # "iMac G5"
`/usr/sbin/system_profiler SPSoftwareDataType SPHardwareDataType`;
my ($v) = ($sp =~ m/^\s*System Version:\s*(.*)$/mi);
my ($s) = ($sp =~ m/^\s*(?:CPU|Processor) Speed:\s*(.*)$/mi);
my ($t) = ($sp =~ m/^\s*(?:Machine|Model) Name:\s*(.*)$/mi);
print "$v\n" if ($v);
print "$s $t\n" if ($s && $t);
$unamep = !defined ($v);
}
if ($unamep) {
safe_system ("uname", "-sr"); # "Linux 2.6.15-1.1831_FC4"
}
print "\n";
safe_system ("date", "+%c");
print "\n";
my $ut = `uptime`;
$ut =~ s/^[ \d:]*(am|pm)?//i;
$ut =~ s/,\s*(load)/\n$1/;
print "$ut\n";
}
}
# Loads the given URL, returns: $http, $head, $body.
#
sub get_url_1($;$) {
my ($url, $referer) = @_;
$url =~ s@^feed:@http:@si;
if (! ($url =~ m@^http://@i)) {
error ("not an HTTP URL: $url");
}
my ($url_proto, $dummy, $serverstring, $path) = split(/\//, $url, 4);
$path = "" unless $path;
my ($them,$port) = split(/:/, $serverstring);
$port = 80 unless $port;
my $them2 = $them;
my $port2 = $port;
if ($http_proxy) {
$serverstring = $http_proxy if $http_proxy;
$serverstring =~ s@^[a-z]+://@@;
($them2,$port2) = split(/:/, $serverstring);
$port2 = 80 unless $port2;
}
my ($remote, $iaddr, $paddr, $proto, $line);
$remote = $them2;
if ($port2 =~ /\D/) { $port2 = getservbyname($port2, 'tcp') }
if (!$port2) {
error ("unrecognised port in $url");
}
$iaddr = inet_aton($remote);
error ("host not found: $remote") unless ($iaddr);
$paddr = sockaddr_in($port2, $iaddr);
my $head = "";
my $body = "";
$proto = getprotobyname('tcp');
if (!socket(S, PF_INET, SOCK_STREAM, $proto)) {
error ("socket: $!");
}
if (!connect(S, $paddr)) {
error ("connect($serverstring): $!");
}
select(S); $| = 1; select(STDOUT);
my $user_agent = "$progname/$version";
my $hdrs = ("GET " . ($http_proxy ? $url : "/$path") . " HTTP/1.0\r\n" .
"Host: $them\r\n" .
"User-Agent: $user_agent\r\n");
if ($referer) {
$hdrs .= "Referer: $referer\r\n";
}
$hdrs .= "\r\n";
if ($verbose > 3) {
foreach (split('\r?\n', $hdrs)) {
print STDERR " ==> $_\n";
}
}
print S $hdrs;
my $http = <S> || "";
$_ = $http;
s/[\r\n]+$//s;
print STDERR " <== $_\n" if ($verbose > 3);
while (<S>) {
$head .= $_;
s/[\r\n]+$//s;
last if m@^$@;
print STDERR " <== $_\n" if ($verbose > 3);
}
print STDERR " <== \n" if ($verbose > 4);
my $lines = 0;
while (<S>) {
s/\r\n/\n/gs;
print STDERR " <== $_" if ($verbose > 4);
$body .= $_;
$lines++;
}
print STDERR " <== [ body ]: $lines lines, " . length($body) . " bytes\n"
if ($verbose == 4);
close S;
if (!$http) {
error ("null response: $url");
}
return ( $http, $head, $body );
}
# Loads the given URL, processes redirects, returns (content-type, body).
#
sub get_url($;$) {
my ($url, $referer) = @_;
print STDERR "$progname: loading $url\n" if ($verbose > 2);
my $orig_url = $url;
my $loop_count = 0;
my $max_loop_count = 10;
do {
my ( $http, $head, $body ) = get_url_1 ($url, $referer);
$http =~ s/[\r\n]+$//s;
if ( $http =~ m@^HTTP/[0-9.]+ 30[123]@ ) {
$_ = $head;
my ( $location ) = m@^location:[ \t]*(.*)$@im;
if ( $location ) {
$location =~ s/[\r\n]$//;
print STDERR "$progname: redirect from $url to $location\n"
if ($verbose > 3);
$referer = $url;
$url = $location;
if ($url =~ m@^/@) {
$referer =~ m@^(http://[^/]+)@i;
$url = $1 . $url;
} elsif (! ($url =~ m@^[a-z]+:@i)) {
$_ = $referer;
s@[^/]+$@@g if m@^http://[^/]+/@i;
$_ .= "/" if m@^http://[^/]+$@i;
$url = $_ . $url;
}
} else {
error ("no Location with \"$http\"");
}
if ($loop_count++ > $max_loop_count) {
error ("too many redirects ($max_loop_count) from $orig_url");
}
} elsif ( $http =~ m@^HTTP/[0-9.]+ ([4-9][0-9][0-9].*)$@ ) {
error ("failed: $1 ($url)");
} else {
my $ct = 'text/plain';
$ct = $1 if ($head =~ m/^content-type:\s*([^\s]+)/mi);
return ($ct, $body);
}
} while (1);
}
# Make an educated guess as to what's in this document.
# We don't necessarily take the Content-Type header at face value.
# Returns 'html', 'rss', or 'text';
#
sub guess_content_type($$) {
my ($ct, $body) = @_;
$body =~ s/^(.{512}).*/$1/s; # only look in first half K of file
if ($ct =~ m@^text/.*html@i) { return 'html'; }
if ($ct =~ m@\b(atom|rss|xml)\b@i) { return 'rss'; }
if ($body =~ m@^\s*<\?xml@is) { return 'rss'; }
if ($body =~ m@^\s*<!DOCTYPE RSS@is) { return 'rss'; }
if ($body =~ m@^\s*<!DOCTYPE HTML@is) { return 'html'; }
if ($body =~ m@<(BASE|HTML|HEAD|BODY|SCRIPT|STYLE|TABLE|A\s+HREF)\b@i) {
return 'html';
}
if ($body =~ m@<(RSS|CHANNEL|GENERATOR|DESCRIPTION|CONTENT|FEED|ENTRY)\b@i) {
return 'rss';
}
return 'text';
}
sub reformat_html($$) {
my ($body, $rss_p) = @_;
$_ = $body;
# In HTML, try to preserve newlines inside of PRE.
#
if (! $rss_p) {
s@(<PRE\b[^<>]*>\s*)(.*?)(</PRE)@{
my ($a, $b, $c) = ($1, $2, $3);
$b =~ s/[\r\n]/<BR>/gs;
$a . $b . $c;
}@gsexi;
}
if (! $rss_p) {
# In HTML, unfold lines.
# In RSS, assume \n means literal line break.
s@[\r\n]@ @gsi;
}
s@<!--.*?-->@@gsi; # lose comments
s@<(STYLE|SCRIPT)\b[^<>]*>.*?</\1\s*>@@gsi; # lose css and js
s@</?(BR|TR|TD|LI|DIV)\b[^<>]*>@\n@gsi; # line break at BR, TD, DIV, etc
s@</?(P|UL|OL|BLOCKQUOTE)\b[^<>]*>@\n\n@gsi; # two line breaks
s@<lj\s+user=\"?([^<>\"]+)\"?[^<>]*>?@$1@gsi; # handle <LJ USER=>
s@</?[BI]>@*@gsi; # bold, italic => asterisks
s@<[^<>]*>?@@gs; # lose all other HTML tags
$_ = de_entify ($_); # convert HTML entities
# elide any remaining non-Latin1 binary data...
s/([\177-\377]+(\s*[\177-\377]+)[^a-z\d]*)/«...» /g;
#s/([\177-\377]+(\s*[\177-\377]+)[^a-z\d]*)/«$1» /g;
$_ .= "\n";
s/[ \t]+$//gm; # lose whitespace at end of line
s@\n\n\n+@\n\n@gs; # compress blank lines
if (!defined($wrap_columns) || $wrap_columns > 0) {
$Text::Wrap::columns = ($wrap_columns || 72);
$_ = wrap ("", " ", $_); # wrap the lines as a paragraph
s/[ \t]+$//gm; # lose whitespace at end of line again
}
s/^\n+//gs;
y/A-Za-z/N-ZA-Mn-za-m/ if ($nyarlathotep_p);
print STDOUT $_;
}
sub reformat_rss($) {
my ($body) = @_;
$body =~ s/(<(ITEM|ENTRY)\b)/\001\001$1/gsi;
my @items = split (/\001\001/, $body);
print STDERR "$progname: converting RSS ($#items items)...\n"
if ($verbose > 2);
shift @items;
# Let's skip forward in the stream by a random amount, so that if
# two copies of ljlatest are running at the same time (e.g., on a
# multi-headed machine), they get different text. (Put the items
# that we take off the front back on the back.)
#
if ($#items > 7) {
my $n = int (rand ($#items - 5));
print STDERR "$progname: rotating by $n items...\n" if ($verbose > 2);
while ($n-- > 0) {
push @items, (shift @items);
}
}
my $i = -1;
foreach (@items) {
$i++;
my ($title, $body1, $body2, $body3);
$title = $3 if (m@<((TITLE) [^<>\s]*)[^<>]*>\s*(.*?)\s*</\1>@xsi);
$body1 = $3 if (m@<((DESCRIPTION) [^<>\s]*)[^<>]*>\s*(.*?)\s*</\1>@xsi);
$body2 = $3 if (m@<((CONTENT) [^<>\s]*)[^<>]*>\s*(.*?)\s*</\1>@xsi);
$body3 = $3 if (m@<((SUMMARY) [^<>\s]*)[^<>]*>\s*(.*?)\s*</\1>@xsi);
# If there are both <description> and <content> or <content:encoded>,
# use whichever one contains more text.
#
if ($body3 && length($body3) >= length($body2 || '')) {
$body2 = $body3;
}
if ($body2 && length($body2) >= length($body1 || '')) {
$body1 = $body2;
}
if (! $body1) {
if ($title) {
print STDERR "$progname: no body in item $i (\"$title\")\n"
if ($verbose > 2);
} else {
print STDERR "$progname: no body or title in item $i\n"
if ($verbose > 2);
next;
}
}
$title = rss_field_to_html ($title || '');
$body1 = rss_field_to_html ($body1 || '');
$title = '' if ($body1 eq $title); # Identical in Twitter's atom feed.
reformat_html ("$title<P>$body1", 1);
print "\n";
}
}
sub rss_field_to_html($) {
my ($body) = @_;
# Assume that if <![CDATA[...]]> is present, everything inside that.
#
if ($body =~ m/^\s*<!\[CDATA\[(.*?)\]\s*\]/is) {
$body = $1;
} else {
$body = de_entify ($body); # convert entities to get HTML from XML
}
$body = de_unicoddle ($body); # convert UTF8 to Latin1
return $body;
}
sub reformat_text($) {
my ($body) = @_;
# only re-wrap if --cols was specified. Otherwise, dump it as is.
#
if ($wrap_columns && $wrap_columns > 0) {
print STDERR "$progname: wrapping at $wrap_columns...\n" if ($verbose > 2);
$Text::Wrap::columns = $wrap_columns;
$body = wrap ("", "", $body);
$body =~ s/[ \t]+$//gm;
}
$body =~ y/A-Za-z/N-ZA-Mn-za-m/ if ($nyarlathotep_p);
print STDOUT $body;
}
# Figure out what the proxy server should be, either from environment
# variables or by parsing the output of the (MacOS) program "scutil",
# which tells us what the system-wide proxy settings are.
#
sub set_proxy() {
# historical suckage: the environment variable name is lower case.
$http_proxy = $ENV{http_proxy} || $ENV{HTTP_PROXY};
if (defined ($http_proxy)) {
if ($http_proxy && $http_proxy =~ m@^http://([^/]*)/?$@ ) {
# historical suckage: allow "http://host:port" as well as "host:port".
$http_proxy = $1;
}
} else {
my $proxy_data = `scutil --proxy 2>/dev/null`;
my ($server) = ($proxy_data =~ m/\bHTTPProxy\s*:\s*([^\s]+)/s);
my ($port) = ($proxy_data =~ m/\bHTTPPort\s*:\s*([^\s]+)/s);
# Note: this ignores the "ExceptionsList".
if ($server) {
$http_proxy = $server;
$http_proxy .= ":$port" if $port;
}
}
print STDERR "$progname: proxy server: $http_proxy\n"
if ($verbose > 2 && $http_proxy);
}
sub get_url_text($) {
my ($url) = @_;
set_proxy();
my ($ct, $body) = get_url ($url);
$ct = guess_content_type ($ct, $body);
if ($ct eq 'html') {
print STDERR "$progname: converting HTML...\n" if ($verbose > 2);
reformat_html ($body, 0);
} elsif ($ct eq 'rss') {
reformat_rss ($body);
} else {
print STDERR "$progname: plain text...\n" if ($verbose > 2);
reformat_text ($body);
}
}
sub error($) {
my ($err) = @_;
print STDERR "$progname: $err\n";
exit 1;
}
sub usage() {
print STDERR "usage: $progname [ --options ... ]\n" .
("\n" .
" Prints out some text for use by various screensavers,\n" .
" according to the options in the ~/.xscreensaver file.\n" .
" This may dump the contents of a file, run a program,\n" .
" or load a URL.\n".
"\n" .
" Options:\n" .
"\n" .
" --date Print the host name and current time.\n" .
"\n" .
" --text STRING Print out the given text. It may contain %\n" .
" escape sequences as per strftime(2).\n" .
"\n" .
" --file PATH Print the contents of the given file.\n" .
" If --cols is specified, re-wrap the lines;\n" .
" otherwise, print them as-is.\n" .
"\n" .
" --program CMD Run the given program and print its output.\n" .
" If --cols is specified, re-wrap the output.\n" .
"\n" .
" --url HTTP-URL Download and print the contents of the HTTP\n" .
" document. If it contains HTML, RSS, or Atom,\n" .
" it will be converted to plain-text.\n" .
"\n" .
" --cols N Wrap lines at this column. Default 72.\n" .
"\n");
exit 1;
}
sub main() {
my $load_p = 1;
my $cocoa_id = undef;
while ($#ARGV >= 0) {
$_ = shift @ARGV;
if ($_ eq "--verbose") { $verbose++; }
elsif (m/^-v+$/) { $verbose += length($_)-1; }
elsif (m/^--?date$/) { $text_mode = 'date';
$load_p = 0; }
elsif (m/^--?text$/) { $text_mode = 'literal';
$text_literal = shift @ARGV || '';
$load_p = 0; }
elsif (m/^--?file$/) { $text_mode = 'file';
$text_file = shift @ARGV || '';
$load_p = 0; }
elsif (m/^--?program$/) { $text_mode = 'program';
$text_program = shift @ARGV || '';
$load_p = 0; }
elsif (m/^--?url$/) { $text_mode = 'url';
$text_url = shift @ARGV || '';
$load_p = 0; }
elsif (m/^--?col(umn)?s?$/) { $wrap_columns = 0 + shift @ARGV; }
elsif (m/^--?cocoa$/) { $cocoa_id = shift @ARGV; }
elsif (m/^--?nyarlathotep$/) { $nyarlathotep_p++; }
elsif (m/^-./) { usage; }
else { usage; }
}
if ($load_p) {
if (!defined ($cocoa_id)) {
# see OSX/XScreenSaverView.m
$cocoa_id = $ENV{XSCREENSAVER_CLASSPATH};
}
if (defined ($cocoa_id)) {
get_cocoa_prefs($cocoa_id);
} else {
get_x11_prefs();
}
}
output();
if (defined ($cocoa_id)) {
#
# On MacOS, sleep for 10 seconds between when the last output is
# printed, and when this process exits. This is because MacOS
# 10.5.0 and later broke ptys in a new and exciting way: basically,
# once the process at the end of the pty exits, you have exactly
# 1 second to read all the queued data off the pipe before it is
# summarily flushed.
#
# Many of the screen savers were written to depend on being able
# to read a small number of bytes, and continue reading until they
# reached EOF. This is no longer possible.
#
# Note that the current MacOS behavior has all four of these
# awesome properties: 1) Inconvenient; 2) Has no sane workaround;
# 3) Different behavior than MacOS 10.1 through 10.4; and 4)
# Different behavior than every other Unix in the world.
#
# See http://jwz.livejournal.com/817438.html, and for those of
# you inside Apple, "Problem ID 5606018".
#
# One workaround would be to rewrite the savers to have an
# internal buffer, and always read as much data as possible as
# soon as a pipe has input available. However, that's a lot more
# work, so instead, let's just not exit right away, and hope that
# 10 seconds is enough.
#
# This will solve the problem for invocations of xscreensaver-text
# that produce little output (e.g., date-mode); and won't solve it
# in cases where a large amount of text is generated in a short
# amount of time (e.g., url-mode.)
#
sleep (10);
}
}
main();
exit 0;
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