Error in Neovim: “attempt to compare string with number”

[klmr]

Based on the error stack traceback, this is related to #481. Unfortunately #565 did not fix it, and the error persists in the current HEAD revision (adc2189).

To reproduce the issue, create a file containing the following and open it in Neovim with LSP configured to use ‘languageserver’:

a =
b = 2

Here’s the full error message:

Error executing vim.schedule lua callback: /opt/local/share/nvim/runtime/lua/vim/diagnostic.lua:431: attempt to compare string with number
stack traceback:
        /opt/local/share/nvim/runtime/lua/vim/diagnostic.lua:431: in function 'add'
        /opt/local/share/nvim/runtime/lua/vim/diagnostic.lua:468: in function 'get_diagnostics'
        /opt/local/share/nvim/runtime/lua/vim/diagnostic.lua:1162: in function 'show'
        /opt/local/share/nvim/runtime/lua/vim/diagnostic.lua:724: in function 'set'
        /opt/local/share/nvim/runtime/lua/vim/lsp/diagnostic.lua:206: in function 'handler'
        /opt/local/share/nvim/runtime/lua/vim/lsp.lua:1049: in function ''
        vim/_editor.lua: in function <vim/_editor.lua:0>

[randy3k]

It sounds like an issue of lintr reporting the row number and column number: https://github.com/REditorSupport/languageserver/blob/master/R/diagnostics.R#L17

We may need to check if the numbers are NAs?

[klmr]

Are you able to reproduce the issue? Otherwise I am happy to patch my local ‘languageserver’ version with instrumentation code. Unfortunately I know absolutely nothing about the Lua/client side of things.

[randy3k]

It has been a while since I used neovim and it seems that neovim supports LSP officially. Could you share how you configure neovim to setup R languageserver?

[klmr]

Here’s a minimal configuration (the config is macOS but on a Linux system using the path ~/.config/nvim instead of ~/Library/Preferences/nvim should have the sam effect):

cat ~/Library/Preferences/nvim/init.lua

vim.opt.runtimepath:append('~/Library/Preferences/nvim/mason.nvim')
vim.opt.runtimepath:append('~/Library/Preferences/nvim/nvim-lspconfig')

require('mason').setup()
require('lspconfig').r_language_server.setup{}

Afterwards, do the following inside the nvim config path to initialise the LSP support plugins:

git clone --depth 1 git@github.com:williamboman/mason.nvim.git
git clone --depth 1 git@github.com:neovim/nvim-lspconfig.git

nvim +:MasonInstall\ r-languageserver

And restart Neovim afterwards.

… in theory these plugins are not necessary but in practice the manual nvim LSP configuration is so complicated that it is recommended to use these plugins.

[klmr]

Hi, I went ahead and locally modified diagnostic_range to include logging the return value (via dput). And, indeed, for the snippet above I am getting the following values after this line:

languageserver/R/diagnostics.R

Line 28 in adc2189

cols <- code_point_to_unit(text, c(result$ranges[[1]][1] - 1, result$ranges[[1]][2]))

result == structure(
  list(
    filename = "/path/to/test.r",
    line_number = 2L,
    column_number = 0L,
    type = "style",
    message = "Indentation should be 4 spaces but is 0 spaces.",
    line = "b = 2",
    ranges = list(c(0L, 4L)),
    linter = "indentation_linter"
  ),
  class = c("lint", "list")
)

text == "b = 2"

cols == c(4, NA)

So there’s a NA length, just as you suspected. Does this help?

[milanglacier]

Here’s a minimal configuration (the config is macOS but on a Linux system using the path ~/.config/nvim instead of ~/Library/Preferences/nvim should have the sam effect):

cat ~/Library/Preferences/nvim/init.lua

vim.opt.runtimepath:append('~/Library/Preferences/nvim/mason.nvim')
vim.opt.runtimepath:append('~/Library/Preferences/nvim/nvim-lspconfig')

require('mason').setup()
require('lspconfig').r_language_server.setup{}

Afterwards, do the following inside the nvim config path to initialise the LSP support plugins:

git clone --depth 1 git@github.com:williamboman/mason.nvim.git
git clone --depth 1 git@github.com:neovim/nvim-lspconfig.git

nvim +:MasonInstall\ r-languageserver

And restart Neovim afterwards.

… in theory these plugins are not necessary but in practice the manual nvim LSP configuration is so complicated that it is recommended to use these plugins.

If languageserver package (install.packages("languageserver") is installed in the R in the PATH, this config should be enough:

vim.opt.runtimepath:append('~/Library/Preferences/nvim/nvim-lspconfig')

require('lspconfig').r_language_server.setup{}

remember git clone --depth 1 git@github.com:neovim/nvim-lspconfig.git.

There's no need to use mason to install r-language-server

[milanglacier]

with neovim 0.9, I can't reproduce the problem. I guess maybe neovim 0.9 has improved the robustness of error handling.

In fact if you go to the source code of in the latest commit of neovim the function add in the top level of the traceback has been moved to line 396.

stack traceback:
        /opt/local/share/nvim/runtime/lua/vim/diagnostic.lua:431: in function 'add'

[klmr]

@milanglacier I am running nvim v0.9.0 and I can still reproduce this bug. The line numbers in the stack trace did change slightly, but the line number now is not 396, it’s 406:

Error executing vim.schedule lua callback: /opt/local/share/nvim/runtime/lua/vim/diagnostic.lua:406: attempt to compare string with number
stack traceback:
        /opt/local/share/nvim/runtime/lua/vim/diagnostic.lua:406: in function 'add'
        /opt/local/share/nvim/runtime/lua/vim/diagnostic.lua:422: in function 'add_all_diags'
        /opt/local/share/nvim/runtime/lua/vim/diagnostic.lua:443: in function 'get_diagnostics'
        /opt/local/share/nvim/runtime/lua/vim/diagnostic.lua:1191: in function 'show'
        /opt/local/share/nvim/runtime/lua/vim/diagnostic.lua:703: in function 'set'
        /opt/local/share/nvim/runtime/lua/vim/lsp/diagnostic.lua:236: in function 'handler'
        /opt/local/share/nvim/runtime/lua/vim/lsp.lua:1057: in function ''
        vim/_editor.lua: in function <vim/_editor.lua:0>

[randy3k]

@klmr Could you check if #614 fixes the issue?

remotes::install_github("REditorSupport/languageserver#614")

[chunyunma]

Sadly, the same error occurred for me today, even after applying the #614 patch.
neovim version = 0.9.1
The error would only appear when I am working .Rmd files, but not with .R file type.