!/bin/sh


yank_bibkey() {
	echo -n "@$1" | wl-copy
}

BIB_FIL="/home/emanuel/Documents/bib/*.bib"
PDF_DIR="/home/emanuel/Documents/pdf/"
MENU_CMD="wmenu -i -N 000000 -n 888888 -M 020202 -m ffffff -S 020202 -s ffffff"
FONT="Iosevka Term Light 8"
PDF_CMD="sioyek"

formt_bib() {
	awk '
	BEGIN { RS="@"; FS="\n" }
	/./ {
		key = author = title = year = ""
		key = $1
		sub(/^[a-zA-Z0-9_]+\{/, "", key)
		sub(/,$/, "", key)

		for (i=2; i<=NF; i++) {
			if ($i ~ /author[[:space:]]*=/) {
				author = $i
				sub(/.*=[[:space:]]*/, "", author)
			} else if ($i ~ /^[[:space:]]*title[[:space:]]*=/) {
				title = $i
				sub(/.*=[[:space:]]*/, "", title)
			} else if ($i ~ /year[[:space:]]*=/) {
				year = $i
				sub(/.*=[[:space:]]*/, "", year)
			}
	}

	gsub(/[{"}]/, "", author); sub(/,$/, "", author); gsub(/^[ \t]+|[ \t]+$/, "", author)
	gsub(/[{"}]/, "", title); sub(/,$/, "", title); gsub(/^[ \t]+|[ \t]+$/, "", title)
	gsub(/[{"}]/, "", year); sub(/,$/, "", year); gsub(/^[ \t]+|[ \t]+$/, "", year)

	if (key && author && title && year) printf "%s|%s|%s|[%s]\n", author, year, title, key
	}' $BIB_FIL 
}

main () {
	while :;  do
		SEL_ENT=$(formt_bib | sort | column -t -s '|' -o '  ' | $MENU_CMD -f "$FONT" -l 30 -p ":bib")

		[ -z "$SEL_ENT" ] && exit 0

		BIB_KEY=$(echo "$SEL_ENT" | sed 's/.*\[//;s/\].*//')
		PDF_PATH="${PDF_DIR}${BIB_KEY}.pdf"

		if [ -f "$PDF_PATH" ]; then
			SEL_MENU=$(printf "open\nyank $BIB_KEY\n.." | $MENU_CMD -f "$FONT" -l 3 -p ":$BIB_KEY")
			case $SEL_MENU in
				"open")
					yank_bibkey "$BIB_KEY"
					"$PDF_CMD" "$PDF_PATH" &
					break
					;;
				yank*)
					yank_bibkey "$BIB_KEY"
					break
					;;
				"..")
					continue
					;;
				*) 
					break
					;;
			esac
		else
			yank_bibkey "$BIB_KEY"
			break
		fi
	done
}

main