environment/home/.config/nvim/lua/lsp.lua

local lspconfig = require("lspconfig")

-- Swift LSP
lspconfig.sourcekit.setup {}

-- Go LSP
lspconfig.gopls.setup {
  cmd = { "gopls" },
  filetypes = { "go", "gomod" },
  root_dir = lspconfig.util.root_pattern("go.mod", ".git"),
  settings = {
    gopls = {
      analyses = { unusedparams = true },
      staticcheck = true,
    },
  },
}

-- ruby LSP
lspconfig.ruby_lsp.setup({
  cmd = { "ruby-lsp" }, -- or provide full path if needed
  filetypes = { "ruby" },
  root_dir = lspconfig.util.root_pattern("Gemfile", ".git"),
})

-- Completion
local cmp = require("cmp")
cmp.setup({
  snippet = {
    expand = function(args)
      vim.fn["vsnip#anonymous"](args.body)
    end,
  },
  mapping = cmp.mapping.preset.insert({
    ["<Tab>"] = cmp.mapping.select_next_item(),
    ["<S-Tab>"] = cmp.mapping.select_prev_item(),
    ["<CR>"] = cmp.mapping.confirm({ select = true }),
  }),
  sources = cmp.config.sources({
    { name = "nvim_lsp" },
    { name = "vsnip" },
  }, {
    { name = "buffer" },
    { name = "path" },
  })
})

-- Syntastic config
vim.g.syntastic_swift_checkers = { 'swiftlint', 'swiftpm' }