bashbot2

#!/usr/bin/env bash

# Default values for things
nick=IrcRoboto22
name=kebab
channel=ircRobotoTestChannel
server=irc.freenode.net
port=6667
fileToTail=''

readonly modulePath="${0%/*}/modules"

# there seems to be a bug(?) in bash which makes it impossible to declare a
# global array in an included script. This is needed in the IRC module
declare -A privMsg

import() {
    # @desc import a module. Which should be another bash script.
    # @param $1 is the script to import

    local module="$1"

    if [[ -f "$modulePath/$module" ]]; then
        . "$modulePath/$module"
    else
        printf '%s\n' "Module $modulePath/$module does not exist" >&2
        exit 1;
    fi
}

import 'string'
import 'irc'

function usage() {
	read -r -d '' usageText << EOF
Usage:
    ${0##*/} [OPTIONS...]

    Options:
        -s, --server $(string.underline SERVER)
                    IP or domain name of the IRC server

        -p, --port $(string.underline PORT)
                    Which port to connect to

        -c, --channel $(string.underline CHANNEL)
                    Name of the channel this bot should join

        -n, --nick $(string.underline NICK)
                    Nickname this bot sould use

        -r, --real-name $(string.underline REALNAME)
                    Real name this bot sould use

        -t, --tail-file $(string.underline FILE)
                    Tail $(string.underline FILE) and output the conetent to the channel

        -d, --debug
                    Print debugging messages

        -h, --help
                    Print this message
EOF
	printf '%s\n\n' "$usageText"
    exit 0
}>&2

TEMP=$(getopt -o s:p:n:r:c:t:hd --long server:,port:,nick:,real-name:,\
channel:,tail-file:,help,debug -n 'bashbot2.sh' -- "$@")

if [[ $? != 0 ]]; then
    printf '%s\n' "Terminating..." >&2 ; exit 1 ;
fi
eval set -- "$TEMP"

while true ; do
    case "$1" in
        -s|--server) server=$2; shift 2 ;;
        -p|--port) port=$2; shift 2;;
        -n|--nick) nick=$2; shift 2;;
        -r|--real-name) name=$2; shift 2;;
        -c|--channel) channel=$2; shift 2;;
        -t|--tail-file) fileToTail=$2; shouldTailFile=1; shift 2;;
        -d|--debug) debug=1; shift;;
        -h|--help) usage; shift;;
        --) shift; break;;
        *) printf '%s\n' "Parsing error" >&2 ; exit 1;;
    esac
done

debugMsg() {
    # @desc Print a noticable debug message to stdout
    # @param Takes all parameters and as message

    # if debug is not set, just abort this function
    [[ ! $debug ]] && return

    local debugMessage="$@"

    printf '%s\n' "$(string.cyan 'DEBUG:') $debugMessage"
}

onExit() {
    # @desc Will send QUIT to IRC server, remove temporary tail file if there is
    # @desc any, kill forks and close the socket.

    kill 0
    irc.sendToServer 'QUIT :Shutting down'
    [[ $shouldTailFile ]] && rm -f ./$fileToTail
    exec 3<&-
    exec 3>&-

    debugMsg "Exit caught. Cleaning up and closing connection."
}

# run onExit when exiting/stopping the script
trap onExit EXIT

irc.connectToServer "$server" "$port"
irc.identify "$nick" "$name" "$channel"

# if -t is set, listen the file
[[ $shouldTailFile ]] && irc.listenToFile

# read every response from the server and handle it line by line
while read -r line; do
    # Line needs to be trimmed of spaces or it will be impossible to parse.
    line=$(string.trim "$line")

    msgType=$(irc.getMsgType "$line")
    printf '%s\n' "$(string.green '>') $line"

    case "$msgType" in
        PING) irc.handlePing "$line";;
        PRIVMSG) irc.handlePrivMsg "$line";;
        MODE) irc.handleMode "$line";;
    esac
done <&3