flake8 config not recognized

[svartkanin]

I'm probably doing something wrong but in my current setup the .flake8 configuration file doesn't seem to be used when the linter is applied?

Example test.py which includes tabs

def test():
    print('hello')

.flake8 config file

[flake8]
ignore = W191
show-source = True

linter configuration nvim/lua/plugins/nvim-lint.lua

return {
  'mfussenegger/nvim-lint',
  event = { 'BufReadPre', 'BufNewFile' },
}

nvim/after/plugins/nvim-lint.lua

require('lint').linters_by_ft = {
  markdown = { 'vale' },
  python = { 'mypy', 'flake8' },
}

local lint = require 'lint'
local lint_augroup = vim.api.nvim_create_augroup('lint', { clear = true })

vim.api.nvim_create_autocmd({
  'BufEnter', -- trigger whenever we open a new buffer or we move the cursor into another buffer
  'BufWritePost', -- trigger whenever we save a buffer
  'InsertLeave', -- trigger whenever we leave insert mode
}, {
  group = lint_augroup,
  callback = function() -- will trigger when any of the above events are triggered
    lint.try_lint() -- the lint plugin which we loaded will try to execute linting
  end,
})

Which will show a flake8 warning

However, running flake8 manually with $ flake8 test.py

will not show the warning as it locates the .flake8 configuration inside the folder

[samharju]

I tried it out and could not reproduce. Steps for what I did:

Created minimal config for neovim with lazy:

local lazypath = vim.fn.stdpath("data") .. "/lazy/lazy.nvim"
if not vim.loop.fs_stat(lazypath) then
        vim.fn.system({
                "git",
                "clone",
                "--filter=blob:none",
                "https://github.com/folke/lazy.nvim.git",
                "--branch=stable",
                lazypath,
        })
end
vim.opt.rtp:prepend(lazypath)

require("lazy").setup({
        {
                "mfussenegger/nvim-lint",
                config = function()
                        local lint = require("lint")

                        lint.linters_by_ft = {
                                python = { "flake8" },
                        }

                        local lint_augroup = vim.api.nvim_create_augroup("nvim_lint_au", { clear = true })

                        vim.api.nvim_create_autocmd({ "BufEnter", "BufWritePost", "InsertLeave" }, {
                                group = lint_augroup,
                                callback = function()
                                        lint.try_lint()
                                end,
                        })
                end,
        },
})

Created the same .flake8 and test.py that you have, then:

mkdir flake
cd flake
python -m venv venv
source venv/bin/activate
pip install flake8
pip freeze
#flake8==7.0.0
#mccabe==0.7.0
#pycodestyle==2.11.1
#pyflakes==3.2.0
vim -u conf.lua test.py

And the config file seems to be picked up correctly. Confirmed by seeing the diagnostic when commenting out the ignore in .flake8.

[svartkanin]

Thanks for the confirmation. I found the culprit, had this in my lsp config

    require('mason-lspconfig').setup {
      handlers = {
        function(server_name)
          local server = servers[server_name] or {}
          -- This handles overriding only values explicitly passed
          -- by the server configuration above. Useful when disabling
          -- certain features of an LSP (for example, turning off formatting for tsserver)
          server.capabilities = vim.tbl_deep_extend('force', {}, capabilities, server.capabilities or {})
          require('lspconfig')[server_name].setup(server)
        end,
      },
    }

which seems to have disabled the loading of the flake8 config.