knot.nvim/lua/telescope/_extensions/telescope_knot.lua

local pickers = require("telescope.pickers")
local finders = require("telescope.finders")
local conf = require("telescope.config").values
local previewers = require("telescope.previewers")
local log = require('plenary.log').new {
  plugin = 'telescope_knot',
  level = 'info',
}

local _get_name = function(record)
    local name = record.rtype .. " " .. record.name .. " " .. record.data
    return name
end  

local _filter_records = function(rec, records)
  local r = {}
  local record_name = rec.value
  for _, record in ipairs(records) do
    local name = _get_name(record)
    if name == record_name then
      r = { "ZONE", record.zone, "RTYPE", record.rtype, "NAME", record.name, "DATA", record.data, "TTL", record.ttl, "URL", record.url }
    end
  end
  return r
end


local telescope_knot = {}
telescope_knot.zones = function(opts)
  local results = vim.json.decode(vim.fn.system("knotctl --json list"))
  local records = {}

  for _, zone in ipairs(results) do
    for _, record in ipairs(zone.records) do
      if record then
        record.zone = zone.name
        table.insert(records, record)
      end
    end
  end
  local entries = vim.tbl_map(
    function(record)
      return _get_name(record)
    end,
    records
  )
  pickers.new(opts, {
    dropdown = true,
    prompt_title = "Records",
    sorter = conf.generic_sorter(opts),
    finder = finders.new_table(entries),
    previewer = previewers.new_buffer_previewer({
      title = "Record",
      define_preview = function(self, entry)
        local record = _filter_records(entry, records)
        vim.api.nvim_buf_set_lines(self.state.bufnr, 0, 0, false, record)
      end

    }),
  }):find()
end
return require('telescope').register_extension({
  exports = {
    telescope_knot = telescope_knot.zones,
  },
})