#!/usr/bin/perl -w
use strict;
# n21pdf.pl: A quick and dirty little program to convert multiple PDFs
# to one PDF requires pdf2ps and Ghostscript
# written by Faber Fedor (faber@linuxnj.com) 2003-05-27
# Tweaked by Ben Okopnik 05-27-2003

die "Usage: ", $0 =~ /([^\/]+)$/, " <outfile.pdf> <directory_of_pdf_files>\n"
	unless @ARGV == 2;

my $filelist;
my ( $GS, $PDF2PS ) = qw#/usr/bin/gs /usr/bin/pdf2ps#;
my $GS_ARGS = "-dNOPAUSE -sDEVICE=pdfwrite -sOUTPUTFILE=$PDFFILE  -dBATCH";

my ( $PDFFILE, $PDFDIR ) = @ARGV;

print "Combining all .pdf files in $PDFDIR into $PDFFILE\n" ;

for ( <$PDFDIR/*pdf> ){
	system "$PDF2PS", "$_", "$_.ps"
		and die "$_ to $_.ps: PDF-PS conversion problem!\n";
	$filelist .= " $_.ps";
}

#convert ps files to a pdf file
system $GS, $GS_ARGS, $filelist
	and die "Problem combining files!\n";

# clean up after yourself
unlink or die "$_: $!\n" for split ' ', $filelist