Alex66
Visual hierarchical graph editor that generates configuration.nix and deploys via nixos-rebuild switch.
- Nodes are Nix fragments
- Gateways descend into subgraphs (floors)
- NixOS merges the composed fragments automatically
- One-click deploy to a real NixOS machine
- OODN registry for ambient config (hostname, timezone, stateVersion…)
- Pre-built stacks (Grafana+Prometheus, Web Server, etc.)
Built with Elixir/Phoenix. Early stage but working end-to-end.
Looking for feedback, improvement ideas, and anyone interested in contributing templates or backends.
All discussion welcome.
GitHub:
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NobbZ
Hi Alex!
The description reads nice, I am searching for a nicer config editor for a while already!
Some screenshots here and/or in the README would be nice. I barely can imagine how this might look like in practice, and at the same time, I can not just try it out, as my NixOS setup is… Not quite the norm.
Also are flakes supported or flake support planned?
Alex66
Here dev.to article with screenshot Tomato
Flakes support is not yet implemented — currently targeting classic configuration.nix — but it’s high on the roadmap. The backend is pluggable so it’s a natural next step. What’s your NixOS setup if you don’t mind sharing?
NobbZ
https://github.com/NobbZ/nixos-config
Alex66
That’s a beautiful config — exactly the kind of complexity Tomato aims to make navigable visually. Flakes support is the clear gap right now.
With flakes you’d have per-host graphs, shared module subgraphs reused across machines, home-manager as another floor.
That’s the roadmap. Mind if I use your config as a reference for the flakes backend design?
Alex66
For Tomato v0.2 flake support, the Walker needs a FlakeBackend that generates:
This is totally doable with the current architecture. The DAG model already supports it — it’s just a different finalize function.
NobbZ
Sure, though especially the flake parts abstraction I have spun around it, might make things a little less easy