spacevim/bundle/trouble.nvim/lua/trouble/providers/qf.lua

local util = require("trouble.util")

local M = {}

local severities = { E = 1, W = 2, I = 3, H = 4 }

function M.get_list(winid)
  local list = winid == nil and vim.fn.getqflist({ all = true }) or vim.fn.getloclist(winid, { all = true })

  local ret = {}
  for _, item in pairs(list.items) do
    local row = (item.lnum == 0 and 1 or item.lnum) - 1
    local col = (item.col == 0 and 1 or item.col) - 1

    local pitem = {
      row = row,
      col = col,
      message = item.text,
      severity = severities[item.type] or 0,
      range = {
        start = { line = row, character = col },
        ["end"] = { line = row, character = -1 },
      },
    }

    table.insert(ret, util.process_item(pitem, item.bufnr))
  end
  return ret
end

function M.loclist(win, _buf, cb, _options)
  return cb(M.get_list(win))
end

function M.qflist(_win, _buf, cb, _options)
  return cb(M.get_list())
end

return M