#!/bin/bash

# Add terzina tags to each canto.xml file in a directory
# Also add canto number attribute.

echo -e "\nAdding terzina tags and numbers."

for file in *;
do
	if [[ "$file" != 'terzina-tags.sh' ]]; then		# exclude this script
		if [[ "$file" != sed* ]]; then			# exclude sed file made later
			echo -e "Modifying $file"
			# Every third line (mod 3) add a closing tag, newline, and opening tag.
			awk -i inplace '{print}; NR % 3 == 0 {print "\t\t</terzina>\n\t\t<terzina num=~NUM~>"}' "$file"
			# Add an opening tag at the beginning and a closing tag at the end because the above awk doesn't.
			sed -i '1s/^/\t\t<terzina num="1">\n/' "$file"
			echo -e "\t\t</terzina>" >> "$file"
			# Add the canto number attribute (at most 160/3 ~ 54 terzine)
			for i in $(seq 1 54);
			do
				# Substitute in the actual number with sed. I couldn't figure out
				# how to include the $i variable with the surrounding attribute
				# quotes in the awk statement, so I just used sed here separately.

				# We start at i=2 because the awk command above
				# doesn't add a terzina tag to the first terzina.
				TERZ_NUM=$((i + 1))
				# Replace only first occurence of ~NUM~.
				sed -i -e "0,/~NUM~/ s/~NUM~/\"$TERZ_NUM\"/" "$file"
			done
		fi
	fi
done