Add plugin support

rowbot

@@ -614,6 +614,64 @@ irc_on_473() {
   log_error "%s: %s" "${msg_args[1]}" "${msg_args[2]}"
 }
 
+###
+# plugin api
+###
+
+plugin_reg() {
+  declare -n plugins=irc_plugin_array_"$1"
+  local plugin
+
+  if [[ -v plugins ]]; then
+    for plugin in "${plugins[@]}"; do
+      if [[ $plugin = "$2" ]]; then
+        return 1
+      fi
+    done
+  else
+    plugins=( )
+  fi
+
+  plugins+=( "$2" )
+}
+
+plugin_run() {
+  # This is a false positive.
+  # shellcheck disable=SC2178
+  declare -n plugins=irc_plugin_array_"$1"
+  shift
+  local plugin
+
+  if [[ -v plugins ]]; then
+    for plugin in "${plugins[@]}"; do
+      "$plugin" "$@"
+    done
+  fi
+}
+
+###
+# plugins
+###
+
+# lime-o-meter
+
+limeometer() {
+  # We don't care about failures here, for better or for worse.
+  # shellcheck disable=SC2155
+  local limes=$(random 1 42) limeification
+
+  if [[ ${msg[from]} = Time-Warp ]]; then
+    limes=42
+  fi
+
+  (( limeification = (limes * 100) / 42 ))
+  irc_privmsg "${msg[to]}" "$limes limes (limes to $limeification%)"
+}
+
+on_init_limeometer() {
+  plugin_reg uplime limeometer
+}
+
 ###
 # irc send handlers
 ###
@@ -806,5 +864,6 @@ while net_recv line; do
     # This variable will be used in later code.
     # shellcheck disable=SC2034
     read -ra action_args <<< "$action_line"
+    plugin_run "$action"
   fi
 done