How to keep on_attach keybindings with build_options?

[Pesky01]

I am using rust tools and using the recommend build_options but how do i keep my keybinds that I defined in lsp.on_attach? I tried making an on_attach field with the exact same code for the regular lsp.on_attach, but that didnt seem to work?

Also how am I supposed to do the language server settings with build_options? Is the way I did it correct?

Thanks!

My base rust analyzer setup that I want to add/share the lsp.on_attach keybinds to:

lsp.preset('recommended')
local rust_settings = {
  settings = {
    ["rust-analyzer"] = {
      checkOnSave = {
        allFeatures = true,
        command = "clippy",
      }
    }
  },
  -- tried this but didnt work
  on_attach = function(_, bufnr)
    local opts = { buffer = bufnr, remap = false }
    vim.keymap.set('n', '<C-x>', vim.lsp.buf.format, opts)
  end
}

local rust_lsp = lsp.build_options('rust_analyzer', { rust_settings })

-- want rust-tools/rust-analyzer to use/share this keybinding
lsp.on_attach(function(client, bufnr)
  local opts = { buffer = bufnr, remap = false }
  vim.keymap.set('n', '<C-x>', vim.lsp.buf.format, opts)
end)

lsp.setup()

require('rust-tools').setup({
  tools = {
    server = rust_lsp,
    inlay_hints = {
      show_parameter_hints = false,
      parameter_hints_prefix = "",
      other_hints_prefix = "",
    }
  }
})

[VonHeikemen]

Just pass the variable as the second argument. No need for the extra {}

local rust_lsp = lsp.build_options('rust_analyzer', rust_settings)

[Pesky01]

Maybe its something with my rust-tools then? I tried that and doesn't work for the rust files, but calling :lua vim.lsp.format() works.

[VonHeikemen]

Looks like server is not part of tools option. Did you tried this?

require('rust-tools').setup({
  server = rust_lsp,
  tools = {
    inlay_hints = {
      show_parameter_hints = false,
      parameter_hints_prefix = "",
      other_hints_prefix = "",
    }
  }
})

[Pesky01]

Ahh im dumb! Yes that works, thank you so much.