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#!/usr/bin/env perl
# $XTermId: cursor.pl,v 1.8 2007/12/03 00:56:29 tom Exp $
# -----------------------------------------------------------------------------
# Copyright 2007 by Thomas E. Dickey
#
# All Rights Reserved
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
# Except as contained in this notice, the name(s) of the above copyright
# holders shall not be used in advertising or otherwise to promote the
# sale, use or other dealings in this Software without prior written
# authorization.
# -----------------------------------------------------------------------------
# Read a file (or pipe from a program) and move the cursor around the screen
# in response to h,j,k,l commands so we can see the colors that affect the
# cursor. Exit on 'q'. Do forward/backward paging to \E[J markers
# in the data with n,p. Ignore other characters.
#
# Use this rather than, say, a curses program since it is much easier to
# construct a particular screen using 'script' or echo commands than to
# guarantee the same screen with curses' optimization.
use strict;
use Getopt::Std;
use IO::Handle;
our ( $opt_x );
our ( $row_max, $col_max );
our $old_stty;
our $text_blob;
our $text_1st;
our $text_2nd;
our $text_chop = qw/^\x1b\[H\x1b\[J/;
our $text_mark = "\x1b[H\x1b[J";
sub get_screensize() {
my @reply = `resize -u`;
chomp @reply;
for my $n (0..$#reply) {
if ( $reply[$n] =~ /=/ ) {
my $value = $reply[$n];
$value =~ s/^.*=//;
if ( $reply[$n] =~ /^COLUMNS.*/ ) {
$col_max = $value;
} else {
$row_max = $value;
}
}
}
}
sub end_cursor($) {
close TTY;
system "stty $old_stty";
print $_[0];
exit;
}
sub begin_cursor() {
open TTY, "+</dev/tty" or end_cursor("Cannot open /dev/tty\n");
autoflush TTY 1;
$old_stty=`stty -g`;
system "stty raw -echo min 0 time 1";
}
sub beep() {
printf "\007";
}
sub get_char() {
my $reply;
do {
$reply=<TTY>;
# printf "get_char\r\n";
} while (not defined $reply);
return $reply;
}
sub move_to($$) {
my $y = $_[0];
my $x = $_[1];
if ( $y < 0 ) {
$y = 0;
} elsif ( $x < 0 ) {
$x = 0;
} elsif ( $y >= $row_max ) {
$y -= 1;
} elsif ( $x >= $col_max ) {
$x -= 1;
} else {
printf "\x1b[%d;%dH", $y + 1, $x + 1;
}
return ( $y, $x );
}
sub vxt_cursor() {
my $ch;
my $x = 0;
my $y = 0;
my @pages = split $text_chop, $text_blob;
my $page = 1;
my_page:
move_to ($y, $x);
printf "%s", $text_mark . $pages[$page];
move_to ($y, $x);
my_loop:
for (;;) {
$ch = get_char();
if ( $ch eq "q") {
last my_loop;
} elsif ( $ch eq "h" ) {
($y, $x) = move_to($y, $x - 1);
} elsif ( $ch eq "j" ) {
($y, $x) = move_to($y + 1, $x);
} elsif ( $ch eq "k" ) {
($y, $x) = move_to($y - 1, $x);
} elsif ( $ch eq "l" ) {
($y, $x) = move_to($y, $x + 1);
} elsif ( $ch eq "n" ) {
if ( $page < $#pages ) {
$page += 1;
goto my_page;
} else {
beep();
}
} elsif ( $ch eq "p" ) {
if ( $page > 1 ) {
$page -= 1;
goto my_page;
} else {
beep();
}
} else {
beep();
# printf "got:%s\r\n", $ch;
}
}
}
sub load_text($) {
my $source = $_[0];
my $text;
if ( defined($opt_x) ) {
$text = `$source`;
} else {
$text = `cat $source`;
}
$text =~ s/\n/\r\n/g;
if ( $text !~ $text_chop ) {
$text = $text_mark . $text;
}
$text_blob = $text_blob . $text;
}
&getopts('x') || die();
while ( $#ARGV >= 0 ) {
load_text ( shift @ARGV );
}
get_screensize();
begin_cursor();
vxt_cursor();
end_cursor("Done\n");
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