stockholm/krebs/5pkgs/simple/irc-announce/default.nix

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{ 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
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IRC_TLS=$5
message=$6
export IRC_CHANNEL # for privmsg_cat
# echo2 and cat2 are used output to both, stdout and stderr
# This is used to see what we send to the irc server. (debug output)
echo2() { echo "$*"; echo "$*" >&2; }
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cat2() {
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awk '{
print $0
print $0 > "/dev/stderr"
}'
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}
# privmsg_cat transforms stdin to a privmsg
privmsg_cat() { awk '{ print "PRIVMSG "ENVIRON["IRC_CHANNEL"]" :"$0 }'; }
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tls_flag() { if [ "$IRC_TLS" -eq 1 ]; then echo "-c"; fi }
# 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
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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"
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awk 'match($0, /PING(.*)/, m) {print "PONG", m[1]; exit}'
# 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 \
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| nc $(tls_flag) "$IRC_SERVER" "$IRC_PORT" | tee -a ircin
''