Of course pyright is an npm package

lua/plugins/completions.lua

@@ -1,3 +1,42 @@
+-- Language servers
+local ensure_installed = {
+  'clangd',    -- C/C++
+  'lua_ls',    -- Lua
+  'opencl_ls', -- OpenCL
+}
+
+if vim.fn.executable('npm') == 1 then
+  local ensure_install_from_npm = {
+    'ansiblels',                       -- Ansible
+    'bashls',                          -- Bash
+    'docker_compose_language_service', -- Docker Compose
+    'dockerls',                        -- Dockerfile
+    'html',                            -- HTML
+    'jsonls',                          -- JSON
+    'pyright',                         -- Python
+    'vimls',                           -- VimScript
+    'yamlls',                          -- YAML
+  }
+  for _, package in ipairs(ensure_install_from_npm) do
+    table.insert(ensure_installed, package)
+  end
+end
+
+if vim.fn.executable('pip') == 1 then
+  local ensure_install_from_pip = {
+    'cmake',    -- CMake
+    'esbonio',  -- Sphinx
+    'ruff_lsp', -- Python
+  }
+  for _, package in ipairs(ensure_install_from_pip) do
+    table.insert(ensure_installed, package)
+  end
+end
+
+if vim.fn.has('win32') == 1 then
+  table.insert(ensure_installed, 'powershell_es')
+end
+
 return {
   'neovim/nvim-lspconfig',
   dependencies = {
@@ -35,26 +74,7 @@ return {
     require('mason').setup()
     require('mason-lspconfig').setup({
       automatic_installation = false,
-      ensure_installed = {
-        -- Language servers
-        'ansiblels',                       -- Ansible
-        'bashls',                          -- Bash
-        'clangd',                          -- C/C++
-        'cmake',                           -- CMake
-        'docker_compose_language_service', -- Docker Compose
-        'dockerls',                        -- Dockerfile
-        'esbonio',                         -- Sphinx
-        'html',                            -- HTML
-        'jsonls',                          -- JSON
-        'lemminx',                         -- XML
-        'lua_ls',                          -- Lua
-        'opencl_ls',                       -- OpenCL
-        'powershell_es',                   -- Powershell
-        'pyright',                         -- Python
-        'ruff_lsp',                        -- Python
-        'vimls',                           -- VimScript
-        'yamlls',                          -- YAML
-      },
+      ensure_installed = ensure_installed,
 
       handlers = {
         -- Default handler, sets up everything unless a custom language server