#!/usr/bin/env perl
 
 #
 # Script taken from InspIRCd, https://www.inspircd.org/
 #
 # This program is distributed in the hope that it will be useful, but WITHOUT
 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 # FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
 # details.
 #
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #
 
 
 BEGIN { require 5.8.0; }
 
 use strict;
 use warnings FATAL => qw(all);
 
 use File::Copy ();
 use Cwd;
 
 sub list_extras ();
 sub enable_extras (@);
 sub disable_extras (@);
 
 # Routine to list out the extra/ modules that have been enabled.
 # Note: when getting any filenames out and comparing, it's important to lc it if the
 # file system is not case-sensitive (== Epoc, MacOS, OS/2 (incl DOS/DJGPP), VMS, Win32
 # (incl NetWare, Symbian)). Cygwin may or may not be case-sensitive, depending on
 # configuration, however, File::Spec does not currently tell us (it assumes Unix behavior).
 sub list_extras () {
 	use File::Spec;
 	# @_ not used
 	my $srcdir = File::Spec->catdir("modules");
 	my $abs_srcdir = File::Spec->rel2abs($srcdir);
 	local $_;
 	my $dd;
 	opendir $dd, File::Spec->catdir($abs_srcdir, "extra") or die (File::Spec->catdir($abs_srcdir, "extra") . ": $!\n");
 	my @extras = map { File::Spec->case_tolerant() ? lc($_) : $_ } (readdir($dd));
 	closedir $dd;
 	undef $dd;
 	opendir $dd, $abs_srcdir or die "$abs_srcdir: $!\n";
 	my @sources = map { File::Spec->case_tolerant() ? lc($_) : $_ } (readdir($dd));
 	closedir $dd;
 	undef $dd;
 	my $maxlen = (sort { $b <=> $a } (map {length($_)} (@extras)))[0];
 	my %extras = ();
 EXTRA:	for my $extra (@extras) {
 		next if (File::Spec->curdir() eq $extra || File::Spec->updir() eq $extra);
 		my $abs_extra = File::Spec->catfile($abs_srcdir, "extra", $extra);
 		my $abs_source = File::Spec->catfile($abs_srcdir, $extra);
 		next unless ($extra =~ m/\.(cpp|h)$/ || (-d $abs_extra)); # C++ Source/Header, or directory
 		if (-l $abs_source) {
 			# Symlink, is it in the right place?
 			my $targ = readlink($abs_source);
 			my $abs_targ = File::Spec->rel2abs($targ, $abs_srcdir);
 			if ($abs_targ eq $abs_extra) {
 				$extras{$extra} = "\e[32;1menabled\e[0m";
 			} else {
 				$extras{$extra} = sprintf("\e[31;1mwrong symlink target (%s)\e[0m", $abs_targ);
 			}
 		} elsif (-e $abs_source) {
 			my ($devext, $inoext) = stat($abs_extra);
 			my ($devsrc, $inosrc, undef, $lnksrc) = stat($abs_source);
 			if ($lnksrc > 1) {
 				if ($devsrc == $devext && $inosrc == $inoext) {
 					$extras{$extra} = "\e[32;1menabled\e[0m";
 				} else {
 					$extras{$extra} = sprintf("\e[31;1mwrong hardlink target (%d:%d)\e[0m", $devsrc, $inosrc);
 				}
 			} else {
 				open my $extfd, "<", $abs_extra;
 				open my $srcfd, "<", $abs_source;
 				local $/ = undef;
 				if (scalar(<$extfd>) eq scalar(<$srcfd>)) {
 					$extras{$extra} = "\e[32;1menabled\e[0m";
 				} else {
 					$extras{$extra} = sprintf("\e[31;1mout of synch (re-copy)\e[0m");
 				}
 			}
 		} else {
 			$extras{$extra} = "\e[33;1mdisabled\e[0m";
 		}
 	}
 
 	for my $extra (sort {$a cmp $b} keys(%extras)) {
 		my $text = $extras{$extra};
 		if ($text =~ m/needed by/ && $text !~ m/enabled/) {
 			printf "\e[31;1;5m%-*s = %s%s\e[0m\n", $maxlen, $extra, $text, ($text =~ m/needed by/ ? ")" : "");
 		} else {
 			printf "%-*s = %s%s\n", $maxlen, $extra, $text, ($text =~ m/needed by/ ? "\e[0m)" : "");
 		}
 	}
 	return keys(%extras) if wantarray; # Can be used by manage_extras.
 }
 
 sub enable_extras (@) {
 	my (@extras) = @_;
 	for my $extra (@extras) {
 		my $extrapath = "modules/extra/$extra";
 		if (!-e $extrapath) {
 			print STDERR "Cannot enable \e[32;1m$extra\e[0m : No such file or directory in modules/extra\n";
 			next;
 		}
 		my $source = "modules/$extra";
 		if (-e $source) {
 			print STDERR "Cannot enable \e[32;1m$extra\e[0m : destination in modules exists (might already be enabled?)\n";
 			next;
 		}
 		print "Enabling $extra ... \n";
 		symlink "extra/$extra", $source or print STDERR "$source: Cannot link to 'extra/$extra': $!\n";
 	}
 }
 
 sub disable_extras (@)
 {
 	opendir my $dd, "modules/extra/";
 	my @files = readdir($dd);
 	closedir $dd;
 	my (@extras) = @_;
 EXTRA:	for my $extra (@extras) {
 		my $extrapath = "modules/extra/$extra";
 		my $source = "modules/$extra";
 		if (!-e $extrapath) {
 			print STDERR "Cannot disable \e[32;1m$extra\e[0m : Is not an extra\n";
 			next;
 		}
 		if ((! -l $source) || readlink($source) ne "extra/$extra") {
 			print STDERR "Cannot disable \e[32;1m$extra\e[0m : Source is not a link or doesn't refer to the right file. Remove manually if this is in error.\n";
 			next;
 		}
 		# Now remove.
 		print "Disabling $extra ... \n";
 		unlink "modules/$extra" or print STDERR "Cannot disable \e[32;1m$extra\e[0m : $!\n";
 	}
 }
 
 my $clearscreen = `clear`;
 print $clearscreen;
 while (1)
 {
 	list_extras;     # print the module list
 	print "\nPlease enter the name of the module or type 'q' to quit.: ";
 	my $input = <STDIN>;
 	chop($input); # remove the trailing \n from the user input
 
 	if ($input eq "q") {
 		if (-e "build/CMakeFiles") {
 			system("cmake", "build/.");
 			print "\nNow cd build, then run make to build Anope.\n\n";
 		} else {
 			print "\nBuild directory not found. You should run ./Config now.\n\n"
 		}
 		exit 0;
 	}
 	print $clearscreen;
 	if ($input eq "") {
 		next;
 	}
 
 	if (-e "modules/$input") {
 		disable_extras($input)
 	} else {
 		enable_extras($input)
 	}
 }

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