lualine.nvim/lua/lualine/extensions/quickfix.lua

-- Copyright (c) 2020-2021 hoob3rt
-- MIT license, see LICENSE for more details.
--
local function is_loclist()
  return vim.fn.getloclist(0, {filewinid = 1}).filewinid ~= 0
end

local function label()
  return is_loclist() and 'Location List' or 'Quickfix List'
end

local function title()
  if is_loclist() then
    return vim.fn.getloclist(0, {title = 0}).title
  end
  return vim.fn.getqflist({title = 0}).title
end

local M = {}

function M.init()
  -- Make sure ft wf doesn't create a custom statusline
  vim.g.qf_disable_statusline = true
end

M.sections = {
  lualine_a = {label},
  lualine_b = {title},
  lualine_z = {'location'}
}

M.filetypes = {'qf'}

return M