Rename Radar control.lua

script.on_init(function()
    for _, player in pairs(game.players) do
        gui_initialize(player)
    end
end)

script.on_event(defines.events.on_player_created, function(event)
    gui_initialize(game.players[event.player_index])
end)

script.on_event(defines.events.on_gui_click, function(event)
    if event.element.name == "rt_minimize_button" then
        gui_functions(game.players[event.player_index])
        --gui_initialize(game.players[event.player_index])
    elseif event.element.name == "train_rename_button" then
        train_rename(game.players[event.player_index])
    end
end)

script.on_event("train-rename", function(event)
  if game.players[event.player_index].selected then
    train_rename(game.players[event.player_index])
  end
end)

--create the minimize button when the game starts or when joining a server
function gui_initialize(player)
    if player.gui.top.rt_minimize_button then
        player.gui.top.rt_minimize_button.destroy()
    end
    if (not player.gui.top.rt_minimize_button) then
        player.gui.top.add{type = "button", name = "rt_minimize_button", caption = "RT", style = "rt_minimize_button_style"}
    end
end

--minimize or maximize the rename GUI
function gui_functions(player)
    if player.gui.left.train_rename_frame then
        player.gui.left.train_rename_frame.destroy()
    else
        frame = player.gui.left.add{type ="frame", name ="train_rename_frame"}
        frame.add{type = "label", name = "train_rename_label", caption = "Train name:"}
        frame.add{type = "textfield", name = "train_rename_textbox"}
        frame.add{type = "button", name = "train_rename_button", caption = "Set"}
    end
end

--rename train or building depending on open gui
function train_rename(player)
    -- local entity_with_open_gui = player.opened
    local entity_with_open_gui = player.selected
  if player.gui.left.train_rename_frame then
    local new_name = player.gui.left.train_rename_frame.train_rename_textbox.text

    if entity_with_open_gui == nil then
      player.print("You must open a locomotive or cargo wagon then press this button.")

    --rename all locomotives in a train if a locomotive or cargo wagon is open and display a confirmation message
    elseif (entity_with_open_gui.type == "locomotive") or (entity_with_open_gui.type == "cargo-wagon") then
      for _, renameme in pairs(entity_with_open_gui.train.locomotives.front_movers) do
        renameme.backer_name = new_name
      end
      for _, renameme in pairs(entity_with_open_gui.train.locomotives.back_movers) do
        renameme.backer_name = new_name
      end
      player.print("All locomotives in this train were renamed: " .. new_name)

    --rename assemling machine, furnace, rocket silo, lab, train stop or roboport if any is open and display a confirmation message
    elseif (entity_with_open_gui.type == "assembling-machine") or (entity_with_open_gui.type == "furnace") or (entity_with_open_gui.type == "rocket-silo") or (entity_with_open_gui.type == "radar") or (entity_with_open_gui.type == "lab") or (entity_with_open_gui.type == "train-stop") or (entity_with_open_gui.type == "roboport") then
      entity_with_open_gui.backer_name = new_name
      player.print("Building renamed: " .. new_name)

    else
      player.print("You must open a locomotive or cargo wagon then press this button.")

    end
  end
end