Add "-a author" option

This option is useful when creating a PDF file with embedded collection
by the same author. Then one can specify the author on the command line
and it will be shown correctly instead of the email address in Amazon's
Personal Documents area.

utils/pdfattach

@@ -19,7 +19,7 @@ function escape_tex_specialchars()
 
 function usage()
 {
-	echo "Usage: $progname -o file.pdf file1.djvu [file2.mp3] ..."
+	echo "Usage: $progname -o file.pdf [-a author] file1.djvu [file2.mp3] ..."
 	exit 1
 }
 
@@ -43,9 +43,13 @@ declare -a infiles=()
 declare -a infiles_texclean=()
 declare -a infilesize=()
 declare -i infcount=0 outfcount=0 totalsize=0
+declare author=""
 
-while getopts ":o:" opt; do
+while getopts ":o:a:" opt; do
 	case $opt in
+	a)
+		author="$OPTARG"
+		;;
 	o)
 		outfile=$(readlink -f "$OPTARG")
 		((outfcount++))
@@ -96,6 +100,9 @@ cd $workdir
 echo -E "\documentclass{book}" >> tmp.tex
 echo -E "\usepackage[margin={1mm},papersize={9cm,12cm}]{geometry}" >> tmp.tex
 echo -E "\usepackage{hyperref,attachfile}" >> tmp.tex
+if [ ! -z "$author" ] ; then
+	echo -E "\AtBeginDocument{\hypersetup{pdfauthor={$author}}}" >> tmp.tex
+fi
 echo -E "\begin{document}" >> tmp.tex
 echo -E "\tolerance=10000\pagestyle{empty}\fontsize{7}{13}\selectfont" >> tmp.tex