LoW: merged two lua files and cleaned up contents

This drops preload events for the [shift_labels] WML tag, now putting it cleanly
in the global campaign "namespace"

data/campaigns/Legend_of_Wesmere/_main.cfg

@@ -23,7 +23,7 @@
 [/units]
 
 [lua]
-    code = "wesnoth.dofile 'campaigns/Legend_of_Wesmere/lua/replace_map.lua'"
+    code = "wesnoth.dofile 'campaigns/Legend_of_Wesmere/lua/wml_tags.lua'"
 [/lua]
 #endif
 

data/campaigns/Legend_of_Wesmere/lua/wml_tags.lua

@@ -0,0 +1,63 @@
+--! #textdomain wesnoth-low
+
+local labels = {}
+local wml_label = wesnoth.wml_actions.label
+local replace_map = wesnoth.wml_actions.replace_map
+
+function wesnoth.wml_actions.shift_labels(cfg)
+	for k, v in ipairs(labels) do
+		wml_label { x = v.x, y = v.y }
+	end
+
+	for k, v in ipairs(labels) do
+		v.x = v.x + cfg.x
+		v.y = v.y + cfg.y
+		wml_label(v)
+	end
+end
+
+--
+-- Overrides of core tags
+--
+
+function wesnoth.wml_actions.label(cfg)
+	table.insert(labels, cfg.__parsed)
+	wml_label(cfg)
+end
+
+function wesnoth.wml_actions.replace_map(cfg)
+	if not cfg.x and not cfg.y then
+		return replace_map(cfg)
+	end
+
+	local x1,x2 = string.match(cfg.x, "(%d+)-(%d+)")
+	local y1,y2 = string.match(cfg.y, "(%d+)-(%d+)")
+	local map = cfg.map_data
+
+	x1 = tonumber(x1)
+	y1 = tonumber(y1)
+	x2 = x2 + 2
+	y2 = y2 + 2
+
+	local t = {}
+	local y = 1
+
+	for row in string.gmatch(map, "[^\n]+") do
+		if y >= y1 and y <= y2 then
+			local r = {}
+			local x = 1
+
+			for tile in string.gmatch(row, "[^,]+") do
+				if x >= x1 and x <= x2 then r[x - x1 + 1] = tile end
+				x = x + 1
+			end
+
+			t[y - y1 + 1] = table.concat(r, ',')
+		end
+
+		y = y + 1
+	end
+
+	local new_map = table.concat(t, '\n')
+	replace_map { map = new_map, expand = true, shrink = true }
+end

data/campaigns/Legend_of_Wesmere/maps/Kalian_map.cfg

@@ -6,15 +6,6 @@
 #     image=items/archery-target-right.png
 # [/item]
 
-# Override the [label] WML tag so that labels are properly shifted when the map is replaced.
-[event]
-    name = preload
-    first_time_only = no
-    [lua]
-        code = "wesnoth.dofile 'campaigns/Legend_of_Wesmere/lua/label.lua'"
-    [/lua]
-[/event]
-
 [event]
     name=prestart