Use nix for testing environment

.busted

@@ -0,0 +1,13 @@
+return {
+  _all = {
+    coverage = false,
+    lpath = "lua/?.lua;lua/?/init.lua",
+    lua = "nlua",
+  },
+  default = {
+    verbose = true
+  },
+  tests = {
+    verbose = true
+  },
+}

.github/workflows/ci.yaml

@@ -2,15 +2,28 @@
 name: NeoVim tests
 on: [push]
 jobs:
-  plenary-tests:
+  code-quality:
     runs-on: ubuntu-latest
     env:
       XDG_CONFIG_HOME: ${{ github.workspace }}/.config/
     steps:
       - uses: actions/checkout@v4
-      - uses: rhysd/action-setup-vim@v1
+      - uses: cachix/install-nix-action@v31
         with:
-          neovim: true
-          version: v0.11.0
-          arch: 'x86_64'
-      - run: make test
+          nix_path: nixpkgs=channel:nixos-unstable
+
+      - name: Populate Nix store
+        run:
+          nix-shell --run 'true'
+
+      - name: Type-check with lua-language-server
+        run:
+          nix-shell --run 'make lint'
+
+      - name: Check formatting with stylua
+        run:
+          nix-shell --run 'make fmt-check'
+
+      - name: Run busted tests
+        run:
+          nix-shell --run 'make test'

.gitignore

@@ -1,4 +1,2 @@
-/.lux/
-lux.lock
 *.src.rock
 *.aider*

Makefile

@@ -1,16 +1,14 @@
-PLENARY_DIR=~/.local/share/nvim/site/pack/test/opt/plenary.nvim
-
-all: lint test
+all: lint fmt-check test
 
 lint:
 	lua-language-server --check=lua/u/ --checklevel=Error
-	lx check
+	@# lx check
+
+fmt-check:
+	stylua --check .
 
 fmt:
 	stylua .
 
-test: $(PLENARY_DIR)
-	NVIM_APPNAME=noplugstest nvim -u NORC --headless -c 'set packpath+=~/.local/share/nvim/site' -c 'packadd plenary.nvim' -c "PlenaryBustedDirectory spec/"
-
-$(PLENARY_DIR):
-	git clone https://github.com/nvim-lua/plenary.nvim/ $(PLENARY_DIR)
+test:
+	busted

lux.toml

@@ -1,19 +0,0 @@
-package = "u.nvim"
-version = "0.2.0"
-lua = ">=5.1"
-
-[description]
-summary = ""
-maintainer = "jrop"
-labels = [ "library", "neovim", "neovim-plugin", "range", "utility" ]
-
-
-[dependencies]
-# Add your dependencies here
-# `busted = ">=2.0"`
-
-[run]
-args = [ "src/main.lua" ]
-
-[build]
-type = "builtin"

selene.toml

@@ -1,4 +0,0 @@
-std = "vim"
-
-[lints]
-multiple_statements = "allow"

shell.nix

@@ -0,0 +1,19 @@
+{
+  pkgs ?
+    import
+      # neovim@0.11.1: https://history.nix-packages.com/package/neovim/0.11.1
+      (fetchTarball "https://github.com/nixos/nixpkgs/tarball/e73c3bf29132da092f9c819b97b6e214367eb71f")
+      { },
+}:
+pkgs.mkShell {
+  packages = [
+    pkgs.git
+    pkgs.gnumake
+    pkgs.lua-language-server
+    pkgs.lua51Packages.busted
+    pkgs.lua51Packages.luarocks
+    pkgs.lua51Packages.nlua
+    pkgs.neovim
+    pkgs.stylua
+  ];
+}

vim.yml

@@ -1,36 +0,0 @@
----
-base: lua51
-globals:
-  vim:
-    any: true
-  assert.are.same:
-    args:
-      - type: any
-      - type: any
-  assert.are_not.same:
-    args:
-      - type: any
-      - type: any
-  assert.has.error:
-    args:
-      - type: any
-      - type: any
-  assert.is_true:
-    args:
-      - type: any
-      - type: any
-  assert.is_false:
-    args:
-      - type: any
-      - type: any
-  describe:
-    args:
-      - type: string
-      - type: function
-  it:
-    args:
-      - type: string
-      - type: function
-  before_each:
-    args:
-      - type: function