mason-org/mason.nvim

[New package]: Topiary Formatter

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#2044 opened on Dec 11, 2025

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help wantednew-package-request

Description

I've searched open & closed issues for similar requests

  • Yes

Package name

Topiary

Package homepage

https://github.com/tweag/topiary?tab=readme-ov-file

Languages

Bash , JSON, Nickel, OCaml, OCamllex, TOML, Tree Sitter Queries, CSS, OpenSCAD, SDML, WIT

How is this package distributed?

  • Cargo
  • OPAM
  • Nix
  • Aruch AUR
  • Homebrew

PS: there are a couple more projects that uses Topiary as a lib to build upon it

Contributor guide

Tech stack
lua
Domain
developer experiencetooling
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
Basic Lua knowledgeFamiliarity with NeovimUnderstanding of mason.nvim's package structure
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
Examine existing package definitions in the mason.nvim repository, particularly the Lua files in lua/mason/registries/ or similar. Look at how other formatters like 'prettier' or 'stylua' are defined. The contributor needs to add a new package entry for Topiary, including its install commands (Cargo, OPAM, Nix, etc.) and supported languages. The issue body lists the languages Topiary supports, which should be mapped to mason.nvim's language identifiers.