twin

A lightweight CLI tool for managing tmux sessions from TOML recipes.

Born out of the frustration of manually setting up tmux workspaces every morning.

Requirements

• Go 1.24+
• tmux
• fzf

Install

go install github.com/Josef-Hlink/twin/cmd/twin@latest

Getting started

Run any twin command with no config in place and twin scaffolds a starter setup at $XDG_CONFIG_HOME/twin/ (falls back to ~/.config/twin/).

$ twin tspmo
no config found — created starter config at ~/.config/twin

This creates:

~/.config/twin/
  twin.toml              # main config
  recipes/
    home.toml            # starter recipe (active by default)
    twin.toml            # meta recipe for poking around twin's own config

From there, add your own recipes and optionally list them as active in twin.toml.

Config

Config lives at ~/.config/twin/twin.toml. Override the location with TWIN_CONFIG_DIR or XDG_CONFIG_HOME.

recipe-dir = "~/.config/twin/recipes"
active = ["front", "back", "infra"]

active controls which recipes twin tspmo spins up.

Recipes

Each recipe is a TOML file in the recipe directory. The filename becomes the session name.

# ~/.config/twin/recipes/front.toml
start-directory = "~/Developer/pro/my-frontend/"

[[windows]]
start-directory = "src/"
commands = ["nvim"]

[[windows]]
# empty window — just a shell

[[windows]]
commands = ["lazygit"]

[[windows]]
commands = ["make run"]

• start-directory (top-level) is required
• start-directory on a window is relative to the recipe's top-level directory
• commands is optional; omit it for a plain shell
• ~ and environment variables are expanded in paths

Subcommands

twin tspmo

Tmux Session Project Management Opener

Spin up tmux sessions for all active recipes. Skips sessions that already exist.

twin fr

From Recipe

Open a single recipe session.

twin fr              # fzf picker (only shows unopened recipes)
twin fr myproject    # open a specific recipe
twin fr --list       # list all available recipes

twin sybau

Switch Your Basis of Active Undertakement

Fuzzy session switcher in a tmux popup. Bind it in tmux.conf:

bind-key Space run-shell "twin sybau --preview"

Disclaimer

This project is entirely vibecoded. Virtually none of the code is written by me — it's all Claude.