ci: nix

Problem: no nix dev shell existed, making it harder to get local
tooling for formatting, linting, and type checking.

Solution: add a flake with a devShell providing prettier, stylua,
selene, and lua-language-server.

.github/workflows/quality.yaml

@@ -11,7 +11,6 @@ jobs:
     runs-on: ubuntu-latest
     outputs:
       lua: ${{ steps.changes.outputs.lua }}
-      python: ${{ steps.changes.outputs.python }}
       markdown: ${{ steps.changes.outputs.markdown }}
     steps:
       - uses: actions/checkout@v4
@@ -25,10 +24,7 @@ jobs:
               - '*.lua'
               - '.luarc.json'
               - '*.toml'
-            python:
-              - 'scripts/**/*.py'
-              - 'pyproject.toml'
-              - 'uv.lock'
+              - 'vim.yaml'
             markdown:
               - '*.md'
 
@@ -39,11 +35,8 @@ jobs:
     if: ${{ needs.changes.outputs.lua == 'true' }}
     steps:
       - uses: actions/checkout@v4
-      - uses: JohnnyMorganz/stylua-action@v4
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          version: 2.1.0
-          args: --check .
+      - uses: cachix/install-nix-action@v31
+      - run: nix develop --command stylua --check .
 
   lua-lint:
     name: Lua Lint Check
@@ -52,11 +45,8 @@ jobs:
     if: ${{ needs.changes.outputs.lua == 'true' }}
     steps:
       - uses: actions/checkout@v4
-      - name: Lint with Selene
-        uses: NTBBloodbath/selene-action@v1.0.0
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          args: --display-style quiet .
+      - uses: cachix/install-nix-action@v31
+      - run: nix develop --command selene --display-style quiet .
 
   lua-typecheck:
     name: Lua Type Check
@@ -72,48 +62,6 @@ jobs:
           directories: lua
           configpath: .luarc.json
 
-  python-format:
-    name: Python Format Check
-    runs-on: ubuntu-latest
-    needs: changes
-    if: ${{ needs.changes.outputs.python == 'true' }}
-    steps:
-      - uses: actions/checkout@v4
-      - name: Install uv
-        uses: astral-sh/setup-uv@v4
-      - name: Install ruff
-        run: uv tool install ruff
-      - name: Check Python formatting with ruff
-        run: ruff format --check .
-
-  python-lint:
-    name: Python Lint Check
-    runs-on: ubuntu-latest
-    needs: changes
-    if: ${{ needs.changes.outputs.python == 'true' }}
-    steps:
-      - uses: actions/checkout@v4
-      - name: Install uv
-        uses: astral-sh/setup-uv@v4
-      - name: Install ruff
-        run: uv tool install ruff
-      - name: Lint Python files with ruff
-        run: ruff check .
-
-  python-typecheck:
-    name: Python Type Check
-    runs-on: ubuntu-latest
-    needs: changes
-    if: ${{ needs.changes.outputs.python == 'true' }}
-    steps:
-      - uses: actions/checkout@v4
-      - name: Install uv
-        uses: astral-sh/setup-uv@v4
-      - name: Install dependencies with mypy
-        run: uv sync --dev
-      - name: Type check Python files with mypy
-        run: uv run mypy .
-
   markdown-format:
     name: Markdown Format Check
     runs-on: ubuntu-latest
@@ -121,15 +69,5 @@ jobs:
     if: ${{ needs.changes.outputs.markdown == 'true' }}
     steps:
       - uses: actions/checkout@v4
-      - name: Setup pnpm
-        uses: pnpm/action-setup@v4
-        with:
-          version: 8
-      - name: Setup Node.js
-        uses: actions/setup-node@v4
-        with:
-          node-version: '20'
-      - name: Install prettier
-        run: pnpm add -g prettier@3.1.0
-      - name: Check markdown formatting with prettier
-        run: prettier --check .
+      - uses: cachix/install-nix-action@v31
+      - run: nix develop --command prettier --check .

.gitignore

@@ -8,3 +8,6 @@ venv/
 CLAUDE.md
 __pycache__
 node_modules/
+
+.direnv/
+.envrc

.luarc.json

@@ -1,8 +1,9 @@
 {
-  "runtime.version": "Lua 5.1",
+  "runtime.version": "LuaJIT",
   "runtime.path": ["lua/?.lua", "lua/?/init.lua"],
   "diagnostics.globals": ["vim"],
   "workspace.library": ["$VIMRUNTIME/lua", "${3rd}/luv/library"],
   "workspace.checkThirdParty": false,
+  "workspace.ignoreDir": [".direnv"],
   "completion.callSnippet": "Replace"
 }

.pre-commit-config.yaml

@@ -9,26 +9,6 @@ repos:
         files: \.lua$
         pass_filenames: true
 
-  - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.14.3
-    hooks:
-      - id: ruff-format
-        name: ruff (format)
-        files: \.py$
-      - id: ruff
-        name: ruff (lint imports)
-        args: ['--fix', '--select=I']
-        files: \.py$
-
-  - repo: local
-    hooks:
-      - id: mypy
-        name: mypy (type check)
-        entry: uv run mypy
-        language: system
-        args: ['.']
-        pass_filenames: false
-
   - repo: https://github.com/pre-commit/mirrors-prettier
     rev: v4.0.0-alpha.8
     hooks:

.styluaignore

@@ -0,0 +1 @@
+.direnv/

flake.lock

@@ -0,0 +1,43 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1771423170,
+        "narHash": "sha256-K7Dg9TQ0mOcAtWTO/FX/FaprtWQ8BmEXTpLIaNRhEwU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "bcc4a9d9533c033d806a46b37dc444f9b0da49dd",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "systems": "systems"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,33 @@
+{
+  description = "midnight.nvim — a dark colorscheme for Neovim";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    systems.url = "github:nix-systems/default";
+  };
+
+  outputs =
+    {
+      nixpkgs,
+      systems,
+      ...
+    }:
+    let
+      forEachSystem =
+        f: nixpkgs.lib.genAttrs (import systems) (system: f nixpkgs.legacyPackages.${system});
+    in
+    {
+      formatter = forEachSystem (pkgs: pkgs.nixfmt-tree);
+
+      devShells = forEachSystem (pkgs: {
+        default = pkgs.mkShell {
+          packages = [
+            pkgs.prettier
+            pkgs.stylua
+            pkgs.selene
+            pkgs.lua-language-server
+          ];
+        };
+      });
+    };
+}

lua/midnight/init.lua

@@ -1,7 +1,14 @@
 local M = {}
 
+local loading = false
+
 ---@return nil
 function M.load()
+  if loading then
+    return
+  end
+  loading = true
+
   if vim.g.colors_name then
     vim.cmd('hi clear')
   end
@@ -15,6 +22,21 @@ function M.load()
 
   local theme = require('midnight.theme')
   theme.apply()
+
+  loading = false
+end
+
+---@deprecated Use `vim.cmd('colorscheme midnight')` instead
+function M.setup(_opts)
+  vim.deprecate(
+    'require("midnight").setup()',
+    'vim.cmd("colorscheme midnight")',
+    'v0.1.0',
+    'midnight.nvim',
+    false
+  )
+
+  M.load()
 end
 
 return M

lua/midnight/theme.lua

@@ -121,9 +121,13 @@ function M.apply()
 
   hi('@variable', { none = true })
 
-  hi('Pmenu', { bg = cs.dark_grey }, { 'PmenuSbar' })
+  hi('Pmenu', { fg = cs.background, bg = cs.foreground }, { 'PmenuSbar' })
   hi('PmenuSel', { bg = cs.med_grey })
   hi('PmenuThumb', { bg = cs.grey })
+  hi('BlinkCmpMenu', { fg = cs.background, bg = cs.foreground })
+  hi('BlinkCmpMenuBorder', { fg = cs.background, bg = cs.foreground })
+  hi('BlinkCmpDoc', { fg = cs.background, bg = cs.foreground })
+  hi('BlinkCmpDocBorder', { fg = cs.background, bg = cs.foreground })
 
   hi('LspInlayHint', { fg = cs.light_black })
   hi('LspSignatureActiveParameter', { underline = true, italic = true })
@@ -145,7 +149,13 @@ function M.apply()
 
   hi('gitCommitSummary', { fg = cs.background })
 
-  hi('@attribute.diff', { fg = cs.background })
+  hi('@attribute.diff', { fg = cs.blue })
+  hi('@diff.minus', { fg = cs.red })
+  hi('@diff.plus', { fg = cs.green })
+  hi('@diff.delta', { fg = cs.blue })
+  hi('@punctuation.special.diff', { fg = cs.blue })
+
+  link('Normal', { '@string.special.path', '@variable.parameter' })
   hi('DiffAdd', { bg = cs.diff_add, fg = cs.green }, { '@text.diff.add', 'diffAdded' })
   hi('DiffDelete', { bg = cs.diff_delete, fg = cs.red }, { '@text.diff.delete', 'diffRemoved' })
   hi('DiffChange', { bg = cs.diff_change, fg = cs.blue })
@@ -159,10 +169,12 @@ function M.apply()
   hi('@constructor.lua', { fg = cs.background })
   hi('@markup.heading.gitcommit', { none = true })
 
+  hi('@function.latex', { fg = cs.blue })
+
   hi('GitSignsCurrentLineBlame', { italic = true, fg = cs.light_black })
-  link('DiffAdd', 'GitSignsAdd')
-  link('DiffChange', 'GitSignsChange')
-  link('DiffDelete', 'GitSignsDelete')
+  hi('GitSignsAdd', { fg = cs.green })
+  hi('GitSignsChange', { fg = cs.blue })
+  hi('GitSignsDelete', { fg = cs.red })
 
   link('Search', 'HighlightUndo')
 
@@ -171,6 +183,23 @@ function M.apply()
   hi('CmpItemAbbr', { fg = cs.background })
   hi('CmpItemAbbrMatch', { fg = cs.background, bold = true })
   hi('CmpItemAbbrMatchFuzzy', { fg = cs.background, bold = true })
+  hi('BlinkCmpLabelMatch', { fg = cs.green })
+  hi('BlinkCmpGhostText', { fg = cs.light_black })
+  hi('BlinkCmpGitKindMR', { fg = cs.magenta })
+  hi('BlinkCmpGitKindPR', { fg = cs.magenta })
+  hi('BlinkCmpGitKindIssue', { fg = cs.magenta })
+  hi('BlinkCmpGitKindCommit', { fg = cs.magenta })
+  hi('BlinkCmpGitKindMention', { fg = cs.magenta })
+  hi('BlinkCmpGitKindIconMR', { fg = cs.magenta })
+  hi('BlinkCmpGitKindIconPR', { fg = cs.magenta })
+  hi('BlinkCmpGitKindIconIssue', { fg = cs.magenta })
+  hi('BlinkCmpGitKindIconCommit', { fg = cs.magenta })
+  hi('BlinkCmpGitKindIconMention', { fg = cs.magenta })
+  hi('BlinkCmpGitLabelMRId', { fg = cs.magenta })
+  hi('BlinkCmpGitLabelPRId', { fg = cs.magenta })
+  hi('BlinkCmpGitLabelIssueId', { fg = cs.magenta })
+  hi('BlinkCmpGitLabelCommitId', { fg = cs.magenta })
+  hi('BlinkCmpGitLabelMentionId', { fg = cs.magenta })
   hi('CmpItemAbbrDeprecated', { fg = cs.light_black, strikethrough = true })
   hi('CmpItemMenu', { fg = cs.light_black })
 

scripts/ci.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+set -eu
+
+nix develop --command stylua --check .
+git ls-files '*.lua' | xargs nix develop --command selene --display-style quiet
+nix develop --command prettier --check .
+nix fmt
+git diff --exit-code -- '*.nix'
+nix develop --command lua-language-server --check . --checklevel=Warning

selene.toml

@@ -1 +1,4 @@
 std = 'vim'
+
+[lints]
+bad_string_escape = 'allow'

vim.toml

@@ -1,30 +0,0 @@
-[selene]
-base = "lua51"
-name = "vim"
-
-[vim]
-any = true
-
-[jit]
-any = true
-
-[assert]
-any = true
-
-[describe]
-any = true
-
-[it]
-any = true
-
-[before_each]
-any = true
-
-[after_each]
-any = true
-
-[spy]
-any = true
-
-[stub]
-any = true

vim.yaml

@@ -0,0 +1,26 @@
+---
+base: lua51
+name: vim
+lua_versions:
+  - luajit
+globals:
+  vim:
+    any: true
+  jit:
+    any: true
+  assert:
+    any: true
+  describe:
+    any: true
+  it:
+    any: true
+  before_each:
+    any: true
+  after_each:
+    any: true
+  spy:
+    any: true
+  stub:
+    any: true
+  bit:
+    any: true