#!/bin/bash

# $1 is the action (append, show, remove)
# $2 is the filename

# Configuration
LFILE="$HOME/.labels"


ACTION="$1"
FNAME="$2"
NFNAME="/tmp/editlabels-`basename "$2"`.$$"

function asklabel() {
	read -e -p "Insert label: " $1
	CVAL=${!1}
	while ( ! grep -q "^$CVAL$" "$LFILE" ) || ( [ "$CVAL" == "" ] ) ; do
		echo "Invalid label \"$CVAL\""
		read -e -p "Insert label: " $1
		CVAL=${!1}
	done
}


if [ "$ACTION" == "menu" ]; then
	function getact() {
		read -p "Append/Remove/Show/Clean/List: " ACT
		if [ "$ACT" == "a" ]; then
			ACTION=append
		elif [ "$ACT" == "r" ]; then
			ACTION=remove
		elif [ "$ACT" == "s" ]; then
			ACTION=show
		elif [ "$ACT" == "c" ]; then
			ACTION=clean
		elif [ "$ACT" == "l" ]; then
			ACTION=list
		else
			echo "Invalid action"
			getact
		fi
	}
	getact
fi


if [ "$ACTION" == "append" ]; then
	ACT=`formail -c -X X-Label < "$FNAME"`
	asklabel LNAME
	if [ "$ACT" == "" ]; then
		NEW="X-Label: $LNAME"
	else
		NEW="$ACT, $LNAME"
	fi

	formail -I "$NEW" < "$FNAME" > "$NFNAME"

elif [ "$ACTION" == "remove" ]; then
	ACT=`formail -c -X X-Label < "$FNAME"`
	asklabel LNAME
	NEW=`echo $ACT | sed "s/, $LNAME//g" | sed "s/$LNAME, //g" | sed "s/: $LNAME/:/g"`
	formail -I "$NEW" < "$FNAME" > "$NFNAME"

elif [ "$ACTION" == "show" ]; then
	formail -c -X "X-Label:" < "$FNAME"
	read -p "Press any key to continue"

elif [ "$ACTION" == "clean" ]; then
	formail -I "X-Label:" < "$FNAME" > "$NFNAME"

elif [ "$ACTION" == "list" ]; then
	echo "Available labels (from ~/.labels):"
	cat $LFILE
	read -p "Press any key to continue"
fi


# if we created a new file, step over the old one
if [ -f "$NFNAME" ]; then
	mv "$NFNAME" "$FNAME"
fi