This solves no real problem — Element works, there's already a Matrix-to-IRC bridge running on half the FOSS networks, and probably nobody under 30 has opened irssi voluntarily this decade.

I wrote it anyway because I miss Esc 4 and clunky window-split commands.

Matrirc is a local IRC server that speaks Matrix on the back. Point irssi at localhost:6667, log in with Matrix creds, rooms show up as channels.

brew tap pawelb0/tap brew install matrirc