#!/bin/bash


usage="
   $(basename "$0") pagenum report-pdf-files

   Use pdftk to create a report containing a single page (pagenum)
   extract from all PDF files report-pdf-files

   ex:
   $(basename "$0") 4 *OIFITS.pdfGRAVI*fits

"
if [[ "$1" == "" ]]; then
   echo "$usage"
   exit
fi
if [[ "$1" == "-h" ]]; then
   echo "$usage"
   exit
fi


pagenum="0"

#
# Extract page from all PDF
#
for arg in "$@"
do
	if [[ $pagenum == "0" ]]
	then
		pagenum=$arg
	else
		file="${arg%.*}"
		ext="${arg##*.}"
		if [[ $ext == "pdf" ]]
		then 
			echo "Extract page "$pagenum" from "$file
			# pdftk $file".pdf" cat $pagenum output $file"-pagenumtmp"$pagenum".pdf"
			cpdf $file".pdf" $pagenum -o $file"-pagenumtmp"$pagenum".pdf"
		fi
	fi
done
#
#
# Merge them into a single PDF document
#
# pdftk `ls *-pagenumtmp"$pagenum".pdf` cat output "gravi_series_page"$pagenum".pdf"
# pdftk *"-pagenumtmp"$pagenum".pdf" cat output "gravi_series_page"$pagenum".pdf"
cpdf *"-pagenumtmp"$pagenum".pdf" -o "gravi_series_page"$pagenum".pdf"
rm -rf *"-pagenumtmp"*.pdf
echo "Create:"
echo " gravi_series_page"$pagenum".pdf"