gluon/package/gluon-mesh-batman-adv-core/files/lib/gluon/announce/nodeinfo.d/network/mesh/bat0/interfaces

local list = util.exec('batctl if')

local wireless = {}
local tunnel = {}
local other = {}

local function get_address(t, ifname)
  pcall(
    function()
      table.insert(t, util.trim(fs.readfile('/sys/class/net/' .. ifname .. '/address')))
    end
  )
end

local function is_wireless(ifname)
  local type = fs.stat('/sys/class/net/' .. ifname .. '/wireless', 'type')

  return type == 'directory'
end

local function is_tuntap(ifname)
  local type = fs.stat('/sys/class/net/' .. ifname .. '/tun_flags', 'type')

  return type == 'regular'
end

local function nil_table(t)
  if next(t) ~= nil then
    return t
  else
    return nil
  end
end

for _, line in ipairs(util.split(list)) do
  local ifname = line:match('^(.-):')
  if ifname ~= nil then
    if is_wireless(ifname) then
      get_address(wireless, ifname)
    elseif is_tuntap(ifname) then
      get_address(tunnel, ifname)
    else
      get_address(other, ifname)
    end
  end
end

return {
  wireless = nil_table(wireless),
  tunnel = nil_table(tunnel),
  other = nil_table(other)
}