where module

clicking a player name in the player list now follows that player.

commands/where.lua

@@ -2,9 +2,35 @@
 
 local Color = require 'utils.color_presets'
 local Event = require 'utils.event'
+local Global = require 'utils.global'
+
+local this = {
+    players = {}
+}
+
+Global.register(
+    this,
+    function(t)
+        this = t
+    end
+)
 
 local Public = {}
 
+local function get_player_data(player, remove)
+    local player_data = this.players[player.index]
+    if player_data then
+        if not remove then
+            return player_data
+        else
+            this.players[player.index] = nil
+        end
+    end
+
+    this.players[player.index] = {}
+    return this.players[player.index]
+end
+
 local function validate_player(player)
     if not player then
         return false
@@ -24,12 +50,33 @@ local function validate_player(player)
     return true
 end
 
-local function create_mini_camera_gui(player, caption, position, surface)
+local function create_mini_camera_gui(player, caption, position, surface, refresh)
-    if player.gui.center['where_camera'] then
+    local target_player = game.players[caption]
+
+    if validate_player(target_player) then
+        local player_data = get_player_data(player)
+        player_data.target_player = target_player
+    else
+        get_player_data(player, true)
+        player.print('Please type a name of a player who is connected.', Color.warning)
+        return
+    end
+
+    if player.gui.center['where_camera'] and not refresh then
         player.gui.center['where_camera'].destroy()
     end
-    local frame = player.gui.center.add({type = 'frame', name = 'where_camera', caption = caption})
+
+    local frame = player.gui.center.where_camera
+    if not frame then
+        frame = player.gui.center.add({type = 'frame', name = 'where_camera', caption = caption})
+    end
+
     surface = tonumber(surface)
+
+    if frame.where_camera then
+        frame.where_camera.destroy()
+    end
+
     local camera =
         frame.add(
         {
@@ -57,8 +104,11 @@ commands.add_command(
             local target_player = game.players[cmd.parameter]
 
             if validate_player(target_player) then
+                local player_data = get_player_data(player)
+                player_data.target_player = target_player
                 create_mini_camera_gui(player, target_player.name, target_player.position, target_player.surface.index)
             else
+                get_player_data(player, true)
                 player.print('Please type a name of a player who is connected.', Color.warning)
             end
         else
@@ -78,12 +128,35 @@ local function on_gui_click(event)
 
     if name == 'where_camera' then
         player.gui.center['where_camera'].destroy()
+        get_player_data(player, true)
         return
     end
 end
 
+local function on_nth_tick()
+    local players = game.connected_players
+    for i = 1, #players do
+        local player = players[i]
+
+        local player_data = get_player_data(player)
+        if player_data and player_data.target_player then
+            local target_player = player_data.target_player
+
+            if not validate_player(target_player) then
+                get_player_data(player, true)
+                goto continue
+            end
+
+            create_mini_camera_gui(player, target_player.name, target_player.position, target_player.surface.index, true)
+
+            ::continue::
+        end
+    end
+end
+
 Public.create_mini_camera_gui = create_mini_camera_gui
 
 Event.add(defines.events.on_gui_click, on_gui_click)
+Event.on_nth_tick(2, on_nth_tick)
 
 return Public