#!/usr/bin/perl
 
################
$|              = 1;            # No buffering plz.
$SIG{INT}       = \&sig;        # Signal handler.
 
$timeout        = 0.20;         # Timeout.
$newline        = 0;            # Show newline on exit?
$termwidth      = 80;           # Terminal Width?
$color          = "\e[0m";
$default_color  = "\e[0m";
$command        = "";
################
 
sub sig {
        #~ Catches Interrupt Signals (defined above)
        print($default_color);
        if (!$newline) { print("\r" . " " x $termwidth . "\r"); }
        exit();
}
 
sub bs {
        #~ The "backspace" routine. - scrolls everything
        #~ forward a bit.
 
        $str =~ s/^(.)(?{$f=$1;})//;
        $str .= $f;
        s/(\n|\t)/ /g;
        $str =~ s/(\n|\t)/ /g;
        s/$/$f/;
        s/^(.)//;
        if (length($_) > ($termwidth - 1)) {
                s/(.{$termwidth - 3}).*/$1\.\.\./;
        }
        print("\r" . " " x 80 . "\r");
 
        $color = "\e[0m" if ($color eq "white");
        $color = "\e[31m" if ($color eq "red");
        $color = "\e[34m" if ($color eq "blue");
        $color = "\e[32m" if ($color eq "green");
 
        print("\r$color$_$default_color");
        select(undef, undef, undef, $timeout);
}
 
sub init {
        #~ Load values ...
        map {
                if (/^--(.*)=(.*)/) {
                        if (defined($$1)) {
                                $$1 = $2;
                                chomp($$1);
                        }
                } elsif (/^--(.*)/) {
                        if (defined($$1)) {
                                $$1 = 1;
                        }
                }
        } @ARGV;
        #~ Scroller initialization routine.
        $str = $_;
        $str =~ s/\n/ /g;
        s/\n/ /g;
        $_ = $"x($termwidth - 1);
        $str .= $"x($termwidth - 1 - length($str));
        if (length($_) > ($termwidth - 1)) { s/(.{77}).*/$1\.\.\./; }
        print;
}
 
################
#~ The main code
 
if(defined($ARGV[0]) && $ARGV[0] ne "") {
        if ($ARGV[0] =~ /^--help/) {
                $| = 0;
                print("Use: $0 <text> [--option[=value]]\n");
                print("Options:\n");
                print("  --timeout=<value>\tThe timeout between each letter scroll. Default is 0.20\n");
                print("  --newline\t\tMake a new line when exiting.\n");
                print("  --color=<value>\tColor the text this color. Default is \"white\"\n");
                print("  \t\t\tColors: white, blue, red, green\n");
                print("  --termwidth=<value>\tThe terminal width. Default is 80\n");
                print("  \t\t\tdo '--termwidth=`echo \$COLUMNS`' to autodetect\n");
                print("  --command=<value>\tA command to run every time the buffer is empty.\n");
                print("  \t\t\tDefault is blank, which means no command. (just the\n");
                print("  \t\t\ttext, over and over and over again.)\n");
                exit();
        } else {
                $_ = shift @ARGV;
        }
} else {
        $_ = "Author: Smári P. McCarthy.        Just Another Perl Hacker.       E-mail: spm\@suse.eyjar.is           Execute '$0 --help' for help.                  ";
}
init();
while(1) {
        for ($i = 0; $i < length($_); $i++) {
                bs();
        }
        if ($command ne "") {
                $str = `$command` . "       ";
                die("\nDead: Application '$command' not found, so I didn't know what to do.\n") if ($?);
        }
}