fix(language): add nix language support with my own config

lua/plugins/all_imports.lua

@@ -0,0 +1,3 @@
+return {
+  import = "plugins.languages.nix",
+}

lua/plugins/languages/nix/nil_nix_lsp.lua

@@ -0,0 +1,35 @@
+-- nix lsp client named nil
+return {
+  -- tell mason to install nil
+  {
+    "williamboman/mason.nvim",
+    opts = function(_, opts)
+      vim.list_extend(opts.ensure_installed or {}, { "nil" })
+    end,
+  },
+  -- add nil to nvim-lspconfig
+
+  {
+    "neovim/nvim-lspconfig",
+    opts = {
+      servers = { nil_ls = {} },
+      setup = {
+        ["nil_ls"] = function()
+          LazyVim.lsp.on_attach(function(client, _)
+            if client.name == "nil_ls" then
+              client.settings = {
+                ["nil"] = {
+                  testSetting = 42,
+                  formatting = {
+                    command = { "nixpkgs-fmt" },
+                  },
+                },
+              }
+            end
+          end)
+        end,
+      },
+    },
+  },
+  -- added nix to telescope languages
+}

lua/plugins/languages/nix/nixpkgs_fmt.lua

@@ -0,0 +1,28 @@
+-- nix formatter named nixpkgs_fmt
+return {
+  -- tell mason to install nixpkgs_fmt
+  {
+    "williamboman/mason.nvim",
+    opts = function(_, opts)
+      vim.list_extend(opts.ensure_installed or {}, { "nixpkgs-fmt" })
+    end,
+  },
+  -- add alejandra to null-ls
+  {
+    "nvimtools/none-ls.nvim",
+    opts = function(_, opts)
+      local nls = require("null-ls")
+      opts.sources = opts.sources or {}
+      table.insert(opts.sources, nls.builtins.formatting.nixpkgs_fmt)
+    end,
+  },
+  -- tell conform to use alejandra
+  {
+    "stevearc/conform.nvim",
+    opts = {
+      formatters_by_ft = {
+        ["nix"] = { "nixpkgs-fmt " },
+      },
+    },
+  },
+}