It is now possible to redirect IRC commands to a callback, in plugins/scripts.

First you have to add a hsignal with callback, to receive command output. Then, add redirection by sending a hsignal, and send your command to IRC server. It will automatically use your redirection.

Each redirection uses a pattern, which defines start/stop/extra commands. Default patterns are: ison, list, mode_channel, mode_channel_ban, mode_channel_ban_exception, mode_channel_invite, mode_user, names, ping, time, topic, userhost, who, whois, whowas.

You can create your own pattern with signal "irc_redirect_pattern".

Examples of redirection and pattern creation are available in WeeChat devel doc.