pancakes

#!/usr/bin/env bash
# writen by Ivan c00kiemon5ter Kanakarakis ~ <ivan.kanak[at]gmail.com>

path="$(dirname "$0")"
conf="${path}/sugar.conf"
cmds="${path}/donuts"

declare -A servers

# check configuration
if [[ ! -r "${conf}" ]] || ! source "${conf}"
then
    printf -- 'error: cannot read configuration: %s\n' "${conf}"
    exit 1
fi

# check commands
if [[ ! -r "${cmds}" ]]
then
    printf -- 'error: cannot read commands: %s\n' "${cmds}"
    exit 1
fi

# set raw flag
if [[ "$1" == '-r' ]]
then declare -r -i RAW=1
else declare -r -i RAW=0
fi

# set default values
: "${prefix:="${HOME}/irc"}"
: "${nickname:=pancakes}"
: "${realname:=cookiebot}"
: "${mode:=+i}"
: "${hostname:=cookiebox}"
: "${servername:=biscuit}"
: "${port:=6667}"

for server in "${!servers[@]}"
do
    mkdir -p "${prefix}/${server}/${nickname}"
    exec {ircfd}<>"${prefix}/${server}/${server}.err" 2>&${ircfd}-

    # open connection to irc server - skip if failure
    if exec {ircfd}<>/dev/tcp/${server}/${port}
    then
        printf -- 'opened connection to server %s:%d\n' "${server}" "${port}"
    else
        printf -- 'unable to open connection to server %s:%d\n' "${server}" "${port}"
        continue
    fi

    {   # identify to server
        [[ -n "${passwd}" ]] && printf -- 'PASS %s\n' "${passwd}"
        printf -- 'NICK %s\n' "${nickname}"
        printf -- 'USER %s %s %s :%s\n' "${nickname}" "${hostname}" "${servername}" "${realname}"
        printf -- 'MODE %s %s\n' "${nickname}" "${mode}"
    } >&${ircfd}

    # wait to get authed with the server
    while read -r -u ${ircfd}
    do
        (( RAW )) && printf -- '%s\n' "$REPLY" >> "${prefix}/${server}/raw.log"

        set -- ${REPLY//$'\r'/}
        [[ "$1" == 'PING' ]] && printf -- 'PONG %s\n' "$2" >&${ircfd} && continue
        [[ "$2" == '001'  ]] && break
    done && printf -- 'authed with server %s:%d\n' "${server}" "${port}"

    # join the channels
    for channel in ${servers[${server}]}
    do
        printf -- 'joining channel %s on %s:%d\n' "${channel}" "${server}" "${port}"
        printf -- 'JOIN %s\n' "${channel}" >&${ircfd}

        mkdir -p "${prefix}/${server}/${channel}"
        fifo="${prefix}/${server}/${channel}/in"

        # create fifo to talk to channel
        rm -f "${fifo}"
        if ! mkfifo "${fifo}"
        then
            printf -- 'error: cannot create fifo %s for channel %s on %s:%d\n' "${fifo}" "${channel}" "${server}" "${port}"
            continue
        fi

        exec {fffd}<>"${fifo}"

        # read fifo input and print to appropriate channel
        while read -r -u ${fffd}
        do printf -- 'PRIVMSG %s :%s\n' "${channel}" "${REPLY}" >&${ircfd}
        done &

        printf -- '
ACTION %s
\n' "Heya peoples :]" >&${fffd}
        printf -- 'you can talk to %s through %s\n' "${channel}" "${fifo}"
    done

    (
    trap 'exec {ircfd}>&-; rm -f ${prefix}/${server}/*/in; kill -TERM 0;' EXIT

    # read raw irc feedback and process messages
    while read -r -u ${ircfd}
    do
        read -r nick action chan mesg <<< "${REPLY%
}"

        # cleanup tokens
        nick="${nick%\!*}"
        nick="${nick#:}"
        mesg="${mesg#:}"

        [[ -e "${prefix}/${server}/${chan}" ]] || mkdir -p "${prefix}/${server}/${chan}"

        (( RAW )) && printf -- '%s\n' "$REPLY" >> "${prefix}/${server}/raw.log"
        (( RAW )) && printf -- '%s\n' "$REPLY" >> "${prefix}/${server}/${chan}/raw.log"

        # keep connection alive and save feedback to log
        if [[ "$nick" == 'PING' ]]
        then printf -- 'PONG %s\n' "$2" >&${ircfd} && continue
        else printf -- '%s <%s> %s\n' "$(date +"%F %R")" "${nick}" "${mesg}" >> "${prefix}/${server}/${chan}/out"
        fi

        # handle parts and joins
        if   [[ "${action}" == 'PART' ]]
        then mesg='!PART'
        elif [[ "${action}" == 'JOIN' ]]
        then mesg='!JOIN'
        elif [[ "${action}" != 'PRIVMSG' ]]
        then continue
        fi

        # pick up urls and send a !url cmd if not a command already
        [[ "${mesg}" =~ ^[^\!]*https?:// ]] && mesg='!url '"${mesg}"

        # execute if command otherwise skip
        [[ "${nick}" != "${nickname}" && "${mesg}" =~ ^\!.+ ]] || continue
        exec "${cmds}" "${mesg#\!}" "${chan#}" "${nick#}" "${nickname}" "${prefix}" "${server}" | cut -c -255 >&${ircfd} &
    done
    ) &
done