From b72a51a3ea4b268ab1ea78d79f1b8e69f46be962 Mon Sep 17 00:00:00 2001
From: Dennis <me@dnsc.io>
Date: Fri, 13 Jun 2025 00:39:43 +0200
Subject: [PATCH] adds tailwind lsp config

---
 hosts/dnsc-air/default.nix                  |   1 +
 hosts/dnsc-work/default.nix                 |   1 +
 modules/nvim/config/lsp/tailwindcss.lua     | 153 ++++++++++++++++++++
 modules/nvim/config/lua/plugins/conform.lua |   3 +-
 4 files changed, 157 insertions(+), 1 deletion(-)
 create mode 100644 modules/nvim/config/lsp/tailwindcss.lua

diff --git a/hosts/dnsc-air/default.nix b/hosts/dnsc-air/default.nix
index 35d2804..5d0aea3 100644
--- a/hosts/dnsc-air/default.nix
+++ b/hosts/dnsc-air/default.nix
@@ -43,6 +43,7 @@
     typescript-language-server
     vscode-langservers-extracted
     astro-language-server
+    tailwindcss-language-server
     lua-language-server
     prettierd
     eslint_d
diff --git a/hosts/dnsc-work/default.nix b/hosts/dnsc-work/default.nix
index f5e2466..2ad2d82 100644
--- a/hosts/dnsc-work/default.nix
+++ b/hosts/dnsc-work/default.nix
@@ -40,6 +40,7 @@
     stylua
     typescript-language-server
     vscode-langservers-extracted
+    tailwindcss-language-server
     lua-language-server
     prettierd
     eslint_d
diff --git a/modules/nvim/config/lsp/tailwindcss.lua b/modules/nvim/config/lsp/tailwindcss.lua
new file mode 100644
index 0000000..d6a9383
--- /dev/null
+++ b/modules/nvim/config/lsp/tailwindcss.lua
@@ -0,0 +1,153 @@
+function root_markers_with_field(root_files, new_names, field, fname)
+  local path = vim.fn.fnamemodify(fname, ":h")
+  local found = vim.fs.find(new_names, { path = path, upward = true })
+
+  for _, f in ipairs(found or {}) do
+    -- Match the given `field`.
+    for line in io.lines(f) do
+      if line:find(field) then
+        root_files[#root_files + 1] = vim.fs.basename(f)
+        break
+      end
+    end
+  end
+
+  return root_files
+end
+
+function insert_package_json(root_files, field, fname)
+  return root_markers_with_field(root_files, { "package.json", "package.json5" }, field, fname)
+end
+
+return {
+  cmd = { "tailwindcss-language-server", "--stdio" },
+  -- filetypes copied and adjusted from tailwindcss-intellisense
+  filetypes = {
+    -- html
+    "aspnetcorerazor",
+    "astro",
+    "astro-markdown",
+    "blade",
+    "clojure",
+    "django-html",
+    "htmldjango",
+    "edge",
+    "eelixir", -- vim ft
+    "elixir",
+    "ejs",
+    "erb",
+    "eruby", -- vim ft
+    "gohtml",
+    "gohtmltmpl",
+    "haml",
+    "handlebars",
+    "hbs",
+    "html",
+    "htmlangular",
+    "html-eex",
+    "heex",
+    "jade",
+    "leaf",
+    "liquid",
+    "markdown",
+    "mdx",
+    "mustache",
+    "njk",
+    "nunjucks",
+    "php",
+    "razor",
+    "slim",
+    "twig",
+    -- css
+    "css",
+    "less",
+    "postcss",
+    "sass",
+    "scss",
+    "stylus",
+    "sugarss",
+    -- js
+    "javascript",
+    "javascriptreact",
+    "reason",
+    "rescript",
+    "typescript",
+    "typescriptreact",
+    -- mixed
+    "vue",
+    "svelte",
+    "templ",
+  },
+  settings = {
+    tailwindCSS = {
+      validate = true,
+      lint = {
+        cssConflict = "warning",
+        invalidApply = "error",
+        invalidScreen = "error",
+        invalidVariant = "error",
+        invalidConfigPath = "error",
+        invalidTailwindDirective = "error",
+        recommendedVariantOrder = "warning",
+      },
+      classAttributes = {
+        "class",
+        "className",
+        "class:list",
+        "classList",
+        "ngClass",
+      },
+      includeLanguages = {
+        eelixir = "html-eex",
+        elixir = "phoenix-heex",
+        eruby = "erb",
+        heex = "phoenix-heex",
+        htmlangular = "html",
+        templ = "html",
+      },
+    },
+  },
+  before_init = function(_, config)
+    if not config.settings then
+      config.settings = {}
+    end
+    if not config.settings.editor then
+      config.settings.editor = {}
+    end
+    if not config.settings.editor.tabSize then
+      config.settings.editor.tabSize = vim.lsp.util.get_effective_tabstop()
+    end
+  end,
+  workspace_required = true,
+  root_dir = function(bufnr, on_dir)
+    local root_files = {
+      -- Generic
+      "tailwind.config.js",
+      "tailwind.config.cjs",
+      "tailwind.config.mjs",
+      "tailwind.config.ts",
+      "postcss.config.js",
+      "postcss.config.cjs",
+      "postcss.config.mjs",
+      "postcss.config.ts",
+      -- Phoenix
+      "assets/tailwind.config.js",
+      "assets/tailwind.config.cjs",
+      "assets/tailwind.config.mjs",
+      "assets/tailwind.config.ts",
+      -- Django
+      "theme/static_src/tailwind.config.js",
+      "theme/static_src/tailwind.config.cjs",
+      "theme/static_src/tailwind.config.mjs",
+      "theme/static_src/tailwind.config.ts",
+      "theme/static_src/postcss.config.js",
+      -- Rails
+      "app/assets/stylesheets/application.tailwind.css",
+      "app/assets/tailwind/application.css",
+    }
+    local fname = vim.api.nvim_buf_get_name(bufnr)
+    root_files = insert_package_json(root_files, "tailwindcss", fname)
+    root_files = root_markers_with_field(root_files, { "mix.lock" }, "tailwind", fname)
+    on_dir(vim.fs.dirname(vim.fs.find(root_files, { path = fname, upward = true })[1]))
+  end,
+}
diff --git a/modules/nvim/config/lua/plugins/conform.lua b/modules/nvim/config/lua/plugins/conform.lua
index c7e01a1..b492904 100644
--- a/modules/nvim/config/lua/plugins/conform.lua
+++ b/modules/nvim/config/lua/plugins/conform.lua
@@ -3,6 +3,7 @@ return {
   opts = {
     formatters_by_ft = {
       typescriptreact = { "prettierd" },
+      astro = { "prettierd" },
       typescript = { "prettierd" },
       javascript = { "prettierd" },
       javascriptreact = { "prettierd" },
@@ -15,7 +16,7 @@ return {
     },
     format_on_save = {
       -- These options will be passed to conform.format()
-      timeout_ms = 300,
+      timeout_ms = 500,
       lsp_format = "fallback",
     },
   },