I’m using NvChad and in ~/.config/nvim/lua/core/mappings.lua there is a keybinding for LSP code action:

  ["<leader>ca"] = {
    function()
      vim.lsp.buf.code_action()
      -- TODO: write buffer to file
    end,
    "LSP code action",
},

this keybinding applies the code action, but does not write to file. I want to write changes to file as soon as I’ve applied the code action.

How can I use the documentation at https://neovim.io/doc/ to find the correct function? I’ve tried looking for a write() function but I could not find anything I can call from lua.

  • Agility0971OPEnglish
    2•1 year ago

    Ok, I found it. list of all vim functions are here :h builtin-function-list and all commands are here: :h ex-cmd-index.

    From using other programming languages, I’m always looking for a list of functions with a complete function signature, “gotcha” notes, when errors can occur and so on. But vim.cmd() does not mention anything about if the command that is being passed in will succeed or fail. Nor does it mention anything about a return value. :h :write mentions that a write might fail, but how could that be detected if it’s being called as vim.cmd.write()?

    • ashEnglish
      1•1 year ago

      You can wrap the call in pcall, which is a lua builtin for catching errors, which would suppress the error and let you know if the command failed.

      You could for example do:

      local ok, res = pcall(vim.cmd.write)
if not ok
then
    vim.notify('write failed with: ' .. res)
end

      There are both lua and vim functions for writing to files but I recommend to not use them in this scenario, they write to the file directly and dont trigger autocommands.

      I understand your frustration with no consitent error reporting and clear api, but I guess that’s the consequence of the entire history of vi and vim and trying to be backwards compatible.