From 8e6bcdb0e54e142841f9454f0eaf3f03d003b45b Mon Sep 17 00:00:00 2001
From: Nick Chambers <nchambers@lightspeedsystems.com>
Date: Tue, 15 Jun 2021 01:33:30 -0500
Subject: [PATCH] Implement the IRC protocol

---
 rowbot | 170 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 169 insertions(+), 1 deletion(-)

diff --git a/rowbot b/rowbot
index b835afb..ea7b7bd 100755
--- a/rowbot
+++ b/rowbot
@@ -88,13 +88,18 @@ else
   log=1
 fi
 
+nick=${opts[nick]:-rowbot-dev}
+ident=${opts[ident]:-rowbot}
+realname=${opts[realname]:-rowbot}
+chan=${opts[chan]:-}
+
 ###
 # net code
 ###
 
 if [[ $tls = yes ]]; then
   coproc sock { socat OPENSSL:"$server":"$port" -; }
-  in_sock=${sock[0]} out_sock=${sock[1]}
+  exec {in_sock}<&"${sock[0]}" {out_sock}>&"${sock[1]}"
 else
   exec {sock}<>/dev/tcp/"$server"/"$port"
   in_sock=$sock out_sock=$sock
@@ -104,18 +109,177 @@ send() {
   local fmt
   printf -v fmt "$1" "${@:2}"
   printf '%s\r\n' "$fmt" >&"$out_sock"
+  debug "sending line: %s" "$fmt"
 }
 
 recv() {
   declare -n sock_line=$1
   IFS= read -r "$1" <&"$in_sock"
   sock_line=${sock_line%$'\r'}
+  debug "received line: %s" "$sock_line"
+}
+
+###
+# irc recv code
+###
+
+on_ERROR() {
+  error "${params[0]}"
+  exit
+}
+
+on_MODE() {
+  if (( ${#params[@]} == 2 )); then
+    info "%s sets mode(s) %s on %s" "$from" "${params[1]}" "${params[0]}"
+  else
+    warn "mode line was not handled: %s" "$orig_line"
+  fi
+}
+
+on_NOTICE() {
+  info "[%s/%s] %s" "$from" "${params[0]}" "${params[1]}"
+}
+
+on_PING() {
+  pong "${params[1]}"
+  debug "received ping: %s" "${params[0]}"
+}
+
+on_PONG() {
+  debug "received pong: %s" "${params[1]}"
+}
+
+on_QUIT() {
+  info "%s has disconnected: %s" "$from" "${params[0]}"
+}
+
+on_001() {
+  info %s "${params[1]}"
+
+  if [[ $chan ]]; then
+    join "$chan"
+  fi
+
+  while true; do
+    ping "row your bot gently down the stream"
+    sleep 10
+  done &
+
+  trap "kill $!" EXIT
+}
+
+on_002() {
+  info %s "${params[1]}"
+}
+
+on_003() {
+  info %s "${params[1]}"
+}
+
+on_004() {
+  debug "%s " "${params[@]:1}"
+}
+
+declare -A isupport
+
+on_005() {
+  local param key value
+
+  for param in "${params[@]:1:${#params[@]}-2}"; do
+    IFS== read -r key value <<< "$param"
+    isupport[$key]=$value
+    debug "isupport: %s = %s" "$key" "$value"
+  done
+}
+
+on_250() {
+  info %s "${params[1]}"
+}
+
+on_251() {
+  info %s "${params[1]}"
+}
+
+on_252() {
+  info "There are %d operators online" "${params[1]}"
+}
+
+on_253() {
+  info "There are %d unknown connections" "${params[1]}"
+}
+
+on_254() {
+  info "There are %d channels formed" "${params[1]}"
+}
+
+on_255() {
+  info %s "${params[1]}"
+}
+
+on_265() {
+  info %s "${params[3]}"
+}
+
+on_266() {
+  info %s "${params[3]}"
+}
+
+on_372() {
+  info %s "${params[1]}"
+}
+
+on_375() {
+  debug %s "${params[1]}"
+}
+
+on_376() {
+  debug %s "${params[1]}"
+}
+
+###
+# irc send code
+###
+
+join() {
+  send "JOIN %s" "$1"
+}
+
+nick() {
+  send "NICK %s" "$1"
+  info "changing nickname to %s" "$1"
+}
+
+ping() {
+  send "PING :%s" "$1"
+}
+
+pong() {
+  send "PONG %s" "$1"
+}
+
+privmsg() {
+  send "PRIVMSG %s :%s" "$1" "$2"
+}
+
+user() {
+  send "USER %s * * :%s" "$ident" "$realname"
+}
+
+###
+# utility hooks
+##
+
+hook_JOIN_greet() {
+  privmsg "${params[0]}" "Hello, $from!"
 }
 
 ###
 # driver
 ###
 
+nick "$nick"
+user "$ident" "$realname"
+
 while recv line; do
   params=( )
   has_words=no
@@ -150,6 +314,10 @@ while recv line; do
     words=( )
   fi
 
+  while IFS= read -r hook; do
+    "$hook"
+  done < <(compgen -A function "hook_${cmd^^}_")
+
   if hash "on_${cmd^^}" 2>/dev/null; then
     "on_${cmd^^}"
   else