-- Configure LSP through rust-tools.nvim plugin.
-- rust-tools will configure and enable certain LSP features for us.
-- See https://github.com/simrat39/rust-tools.nvim#configuration
local opts = {
  tools = {
    runnables = {
      use_telescope = true,
    },
    inlay_hints = {
      auto = true,
      show_parameter_hints = false,
      parameter_hints_prefix = "",
      other_hints_prefix = "",
    },
  },

  -- all the opts to send to nvim-lspconfig
  -- these override the defaults set by rust-tools.nvim
  -- see https://github.com/neovim/nvim-lspconfig/blob/master/CONFIG.md#rust_analyzer
  server = {
    -- on_attach is a callback called when the language server attachs to the buffer
    on_attach = on_attach,
    settings = {
      -- to enable rust-analyzer settings visit:
      -- https://github.com/rust-analyzer/rust-analyzer/blob/master/docs/user/generated_config.adoc
      ["rust-analyzer"] = {
        -- enable clippy on save
        checkOnSave = {
          command = "clippy",
        },
      },
    },
  },
}

require("rust-tools").setup(opts)

-- Setup Completion
-- See https://github.com/hrsh7th/nvim-cmp#basic-configuration
local cmp = require("cmp")
cmp.setup({
  preselect = cmp.PreselectMode.None,
  snippet = {
    expand = function(args)
      vim.fn["vsnip#anonymous"](args.body)
    end,
  },
  mapping = {
    ["<C-p>"] = cmp.mapping.select_prev_item(),
    ["<C-n>"] = cmp.mapping.select_next_item(),
    -- Add tab support
    ["<S-Tab>"] = cmp.mapping.select_prev_item(),
    ["<Tab>"] = cmp.mapping.select_next_item(),
    ["<C-d>"] = cmp.mapping.scroll_docs(-4),
    ["<C-f>"] = cmp.mapping.scroll_docs(4),
    ["<C-Space>"] = cmp.mapping.complete(),
    ["<C-e>"] = cmp.mapping.close(),
    ["<CR>"] = cmp.mapping.confirm({
      behavior = cmp.ConfirmBehavior.Insert,
      select = true,
    }),
  },

  -- Installed sources
  sources = {
    { name = "nvim_lsp" },
    { name = "vsnip" },
    { name = "path" },
    { name = "buffer" },
  },
})