#!/usr/bin/perl
# xcat: an XMLterm wrapper for the UNIX "cat" command
# Usage: xcat  [-h|help]

use Cwd;
use Getopt::Long;

Getopt::Long::config('bundling');

$options = "@ARGV";

&GetOptions("help|h!");

if ($opt_help) {
    print STDERR "Usage: xcat <URL1> <URL2> ...\n";
    exit;
}

my $cookie = $ENV{LTERM_COOKIE};           # XMLTerm cookie

my $dir = cwd();

foreach my $url (@ARGV) {                 # for each argument
    my ($protocol, $slashpair, $username, $host, $port, $pathname);

    if ( $url =~ m%\b                             # initiator
                 ([a-zA-Z]\w*)?:                  # protocol
                 (//)?                            # slashpair
                 (?:([\w.]+)@)?                   # username
                 ([\w\-]+(?:\.[\w\-]+)*)?         # host
                 (?::(\d+))?                      # port
                 (/\S*?)?                         # pathname
                 (?=>|\"|\'|\s|[.,!](?:\s|\Z)|\Z) # terminator (look ahead)
                 %x ) {

        ($protocol, $slashpair, $username, $host, $port, $pathname) =
          ($1, $2, $3, $4, $5, $6);
##        print STDERR "URL: protocol=$protocol, slashpair=$slashpair, username=$username, host=$host, port=$port, pathname=$pathname\n";

    } else {
        # Not an URL; assume it is a local file

        # Prepend current working directory, if need be, to make full pathname
        $url = $dir . "/" . $url if ($url and !($url =~ m%\A/%));

##        print STDERR "Not an URL; assume local file $url\n";

        ($protocol, $slashpair, $username, $host, $port, $pathname) =
          ("file", "//", "", "", "", $url);

    }

    if (($protocol ne "http") && ($protocol ne "file")) {
        print STDERR "xcat: Cannot handle URI protocol $protocol:\n";
        next;
    }

    if ($protocol eq "file") {    # Local filename

        if (!(-e $pathname)) {
            print STDERR "xcat: File $pathname not found\n";
            next;
        }

        if (!(-r $pathname)) {
            print STDERR "xcat: Unable to read file $pathname\n";
            next;
        }

        if (-d $pathname) {
            print STDERR "xcat: Use the 'xls' command to list contents of directory $pathname\n";
            next;
        }
    }

    $pathname =~ m%\A(.*?) (\.[^/.]*)?\Z%x # Deconstruct pathname
        or die "xcat: Internal error; unable to deconstruct pathname\n";

    ($filename, $extension) = ($1, $2);

##    print STDERR "Filename=$filename, extension=$extension\n";

    if (($extension eq ".gif") || ($extension eq ".png")) {
##        print STDERR "Image file\n";
            
        print "\e{S$cookie\a";             # HTML stream escape sequence
        print "<IMG SRC='$protocol://${host}$pathname'>";
        print "\000";                      # Terminate HTML stream

    } elsif (($protocol eq "http") || ($extension eq ".htm")
                                   || ($extension eq ".html")) {
        print STDERR "Web/HTML file (unable to display due to IFRAME bug)\n";

    } elsif (($protocol eq "file") && ($extension eq ".url")) {
        # URL
        open INFILE, $pathname or next;
        $_ = <INFILE>;
        close INFILE;

        my @urlvals;
        my $nurl = 0;
        while ( m%\b                              # initiator
                 (http|file|mailto):              # protocol
                 (//)?                            # slashpair
                 (?:([\w.]+)@)?                   # username
                 ([\w\-]+(?:\.[\w\-]+)*)?         # host
                 (?::(\d+))?                      # port
                 (/\S*?)?                         # pathname
                 (?=>|\"|\'|\s|[.,!](?:\s|\Z)|\Z) # terminator (look ahead)
                 %x ) {
            $urlvals[$nurl] = $&;
            s%$&%%;
            $nurl++;
        }
        s%\A\s*(\S.*?)?\s*\Z%$1%;

        if ($nurl >= 1) {
            my $urldesc = $_;
            my $urlstr = $urlvals[0];
            $urldesc = $urlstr if !$urldesc;

            my $clickcmd =
                 qq%onclick="return clickXMLTerm('textlink',-#,'$urlstr')"%;

            print "\e{S$cookie\a";             # HTML stream escape sequence
            if ($nurl >= 2) {
                print "<img src='$urlvals[1]' $clickcmd><br>";
            }
            print "<div class='textlink' $clickcmd')\">$urldesc</div>";
            print "\000";                      # Terminate HTML stream
        }

    } elsif ((-T $pathname) || ($extension eq "txt")) {  # plain text file
##        print STDERR "Text file\n";

        open INFILE, $pathname or next;
        print "\e{S$cookie\a";             # HTML stream escape sequence
        print "<pre>";

        while (<INFILE>) {
            s/&/&amp;/g;
            s/</&lt;/g;
            s/>/"&gt;"/g;
                s%\b                              # initiator
                 ([a-zA-Z]\w*)?:                  # protocol
                 (//)?                            # slashpair
                 (?:([\w.]+)@)?                   # username
                 ([\w\-]+(?:\.[\w\-]+)*)?         # host
                 (?::(\d+))?                      # port
                 (/\S*?)?                         # pathname
                 (?=>|\"|\'|\s|[.,!](?:\s|\Z)|\Z) # terminator (look ahead)
                 %<span class="textlink" onClick="return clickXMLTerm('textlink',-1,'$&')">$&</span>%xg;
                s/"&gt;"/&gt;/g;

            print $_;
        }

        print "</pre>";
        print "\000";                      # Terminate HTML stream
        close INFILE;

    } else {                            # unknown file type
        print STDERR "xcat: File type unknown for $pathname\n";
        next;
    }
}