mfw

#!/bin/bash

#----------------------------------------------------------------------------------
# Project Name      - miscellaneous/mfw (Mint Forum Watch)
# Started On        - Sun 21 Jan 14:15:13 GMT 2018
# Last Change       - Wed 31 Jan 12:46:40 GMT 2018
# Author E-Mail     - terminalforlife@yahoo.com
# Author GitHub     - https://github.com/terminalforlife
#----------------------------------------------------------------------------------
# As I frequent the Mint forums so often, in an effort to help people, it'd be
# helpful to me if I can be apprised of thread posts in the Newbie Questions
# forums. This small program does just that; designed to run in the background.
#
# At some point, I may introduce the ability to watch different forums.
#----------------------------------------------------------------------------------

XERR(){ printf "[L%0.4d] ERROR: %s\n" "$1" "$2" 1>&2; exit 1; }
ERR(){ printf "[L%0.4d] ERROR: %s\n" "$1" "$2" 1>&2; }

declare -i DEPCOUNT=0
for DEP in /bin/sleep /usr/bin/{notify-send,wget}; {
	[ -x "$DEP" ] || {
		ERR "$LINENO" "Dependency '$DEP' not met."
		DEPCOUNT+=1
	}
}

[ $DEPCOUNT -eq 0 ] || exit 1

USAGE(){
	while read -r; do
		printf "%s\n" "$REPLY"
	done <<-EOF
		            MFW - Mint Forum Watch (31st January 2018)
		            Written by terminalforlife (terminalforlife@yahoo.com)
		
		            Notifier for page-one threads on the Newbie Questions Linux Mint forum.

		SYNTAX:     mfw [OPTS] [INTERVAL]
		
		OPTS:       --help|-h|-?            - Displays this help information.
		            --debug|-D              - Enables the built-in bash debugging.
		            --filter|-F ID          - Omit threads by their ID number. (See URL)
		            --no-notify-wait        - Display all notifications at once.
		            --run-once|-O           - Don't run in the background; run only once.

		EXAMPLE:    mfw -F 12345 -F 54321 --no-notify-wait 30

		NOTE:       Where INTERVAL is the time between each check, in minutes.

		SITE:       https://forums.linuxmint.com
	EOF
}

while [ "$1" ]; do
	case "$1" in
		--help|-h|-\?)
			USAGE; exit 0 ;;
		--debug|-D)
			DEBUGME="true" ;;
		--filter|-F)
			shift; ID="$1" ;;
		--no-notify-wait)
			NO_NOTIFY_WAIT="true" ;;
		--run-once|-O)
			RUN_ONCE="true" ;;
		-*)
			XERR "$LINENO" "Incorrect argument(s) specified." ;;
		*)
			break ;;
	esac

	shift
done

INTERVAL="$1"

[ "$DEBUGME" == "true" ] && set -xeu

URL='https://forums.linuxmint.com/viewforum.php?f=90'
REGEX='\?f=90\&amp\;t=[0-9]+\&amp;sid=[0-9a-z]+\"\sclass=\"topictitle\">.*<'

# Filter out the old standard, stickied threads, plus user specified threads.
FILTER=(83444 83314 81997 97158 245700 230142 219089 224270 $FILTER_ADD)

while :; do
	PARSE(){
		while IFS=">" read -a X; do
			if [[ "${X[*]}" =~ class=\"posts\"\ [0-9]+\ \< ]]; then
				T_REP="${X[1]//[!0-9]}"
				[ $T_REP -eq 0 ] || continue
			elif [[ "${X[*]}" =~ class=\"topictitle\" ]]; then
				IFS=";" read -a Y <<< "${X[0]/*<a href=}"
				T_ID="${Y[1]//[!0-9]}"
				T_STR="${X[1]%</a}"

				for Z in ${FILTER[@]}; {
					[ "$Z" == "$T_ID" ] && continue 2
				}

				printf "%6d[%0.2d]: %s\n" "$T_ID" "$T_REP" "$T_STR"
			fi
		done <<< "$(/usr/bin/wget -q "$URL" -O -)"
	}

	while read -a R; do
		BUF="${R/???????}"

		if ! [ "$NO_NOTIFY_WAIT" == "true" ]; then
			printf -v SECS "%0.5d" "$RANDOM"
			/bin/sleep ${SECS%???}s
		fi

		/usr/bin/notify-send "${R[*]}"
	done <<< "$(PARSE)"

	if ! [ "$RUN_ONCE" == "true" ]; then
		/bin/sleep ${INTERVAL}m
	else
		break
	fi
done &

# vim: noexpandtab colorcolumn=84 tabstop=8 noswapfile nobackup