{ pkgs, lib, ... }: with lib; pkgs.writeDashBin "irc-announce" '' set -euf export PATH=${makeSearchPath "bin" (with pkgs; [ coreutils gawk gnused netcat nettools ])} IRC_SERVER=$1 IRC_PORT=$2 IRC_NICK=$3_$$ IRC_CHANNEL=$4 message=$5 export IRC_CHANNEL # for privmsg_cat # echo2 and cat2 are used output to both, stdout and stderr # This is used to see what we send to the irc server. (debug output) echo2() { echo "$*"; echo "$*" >&2; } cat2() { tee /dev/stderr; } # privmsg_cat transforms stdin to a privmsg privmsg_cat() { awk '{ print "PRIVMSG "ENVIRON["IRC_CHANNEL"]" :"$0 }'; } # ircin is used to feed the output of netcat back to the "irc client" # so we can implement expect-like behavior with sed^_^ # XXX mkselfdestructingtmpfifo would be nice instead of this cruft tmpdir=$(mktemp --tmpdir -d irc-announce_XXXXXXXX) cd "$tmpdir" mkfifo ircin trap " rm ircin cd '$OLDPWD' rmdir '$tmpdir' trap - EXIT INT QUIT " EXIT INT QUIT { echo2 "USER $LOGNAME 0 * :$LOGNAME@$(hostname)" echo2 "NICK $IRC_NICK" # wait for MODE message sed -n '/^:[^ ]* MODE /q' echo2 "JOIN $IRC_CHANNEL" printf '%s' "$message" \ | privmsg_cat \ | cat2 echo2 "PART $IRC_CHANNEL" # wait for PART confirmation sed -n '/:'"$IRC_NICK"'![^ ]* PART /q' echo2 'QUIT :Gone to have lunch' } < ircin \ | nc "$IRC_SERVER" "$IRC_PORT" | tee -a ircin ''