Extract compiled fields from a PDF form and save as CSV

#!/bin/bash
filename=$1

if [[ -z $1 ]]; then
echo "USAGE: ./pdf-to-csv.sh compiledform.pdf outputtable.csv H"
echo "The last argument can be both V or H. If V (or not specified) the table is going to be vertical, if H the table is going to be horizontal. The letter O is an alias for H, they both mean horizontal."
echo "If the second argument is not specified, the program just prints on screen a vertical tables."
echo "Please notice that this script works if you build your PDF form with LibreOffice Writer, and if the user compiles it with LibreOffice Writer. Did not try other tools, they might works as well but I can't guarantee."
echo "Script by Luca Tringali, tringalinvent [at] libero.it"
else


pdftk $filename dump_data_fields output filled_form.txt

names=$(less filled_form.txt | grep "FieldName:" | cut -d ":" -f 2 | cut -c 2-)
values=$(less filled_form.txt | grep "FieldValue:" | cut -d ":" -f 2 | cut -c 2-)

if [[ -z $3 ]] || [[ $3 == "V" ]]; then
header="FieldName;FieldValue"
data=$(paste <(echo "$names") <(echo "$values") --delimiters ';')
else

if [[ $3 == "H" ]] || [[ $3 == "O" ]]; then
header=""
while read -r line
do
    header="$header$line;"
done <<<"$names"

data=""
while read -r line
do
    data="$data$line;"
done <<<"$values"
fi
fi

csvtext="${header}\n${data}"


if [[ -z $2 ]]; then
echo -e "${csvtext}"
else
echo -e "${csvtext}"  > $2
fi

rm filled_form.txt

fi