Better number formating

Is it 120000 or 1200000?

technic/helpers.lua

@@ -1,3 +1,16 @@
+--load config
+local sepchar, baresepchar = nil, nil
+do
+	local sepcode = technic.config:get("thousand_separator")
+	--default is SI style
+	sepchar = sepcode and string.char(sepcode) or " "
+	baresepchar = sepchar
+	--handling if sepchar is magic...
+	for magic in string.gmatch("().%+-*?[^$", ".") do
+		if sepchar == magic then sepchar = "%"..sepchar end
+	end
+end
+
 -- Only changes name, keeps other params
 function technic.swap_node(pos, name)
 	local node = minetest.get_node(pos)
@@ -44,3 +57,39 @@ function technic.get_or_load_node(pos)
 	local MinEdge, MaxEdge = vm:read_from_map(pos, pos)
 	return nil
 end
+
+function technic.format(str, ...)
+	local arg={...}
+	local param = nil
+	local percent = false
+	local res = ""
+	local i = 1
+	for c in str:gmatch"." do
+		if percent then
+			assert(c ~= "%") --syntax error
+			if c == "e" then
+				-- use enhanced number formatting
+				-- only works for unsigned numbers
+				local numstr = tostring(math.abs(arg[i]))
+				local a, b, body, frac = numstr:find("^(%d+)([.]?.-)$")
+				a = 1
+				body = body..baresepchar
+				while a ~= 0 do
+					body, a = body:gsub("(%d)(%d%d%d)"..sepchar, "%1"..sepchar.."%2"..sepchar, 1)
+				end
+				body = body:gsub(sepchar.."$", "")
+				res = res .. body .. frac
+			else
+				--use traditional string:format
+				res = res .. (string.format(("%"..c), arg[i]))
+				i = i + 1
+			end
+			percent = false
+		elseif c == "%" then
+			percent = true
+		else
+			res = res .. c
+		end
+	end
+	return res
+end

technic/machines/LV/solar_panel.lua

@@ -24,7 +24,7 @@ local run = function(pos, node)
 		local charge_to_give = math.floor((light + pos1.y) * 3)
 		charge_to_give = math.max(charge_to_give, 0)
 		charge_to_give = math.min(charge_to_give, 200)
-		meta:set_string("infotext", S("%s Active"):format(machine_name).." ("..charge_to_give.."EU)")
+		meta:set_string("infotext", technic.format(S("%s Active (%e EU)"), machine_name, charge_to_give))
 		meta:set_int("LV_EU_supply", charge_to_give)
 	else
 		meta:set_string("infotext", S("%s Idle"):format(machine_name))

technic/machines/MV/wind_mill.lua

@@ -55,7 +55,7 @@ local run = function(pos, node)
 		meta:set_int("MV_EU_supply", power)
 	end
 
-	meta:set_string("infotext", machine_name.." ("..power.."EU)")
+	meta:set_string("infotext", technic.format("%s (%eEU)", machine_name, power))
 end
 
 minetest.register_node("technic:wind_mill", {

technic/machines/register/battery_box.lua

@@ -142,7 +142,7 @@ function technic.register_battery_box(data)
 			.."^[lowpart:"..charge_percent
 			..":technic_power_meter_fg.png]")
 
-		local infotext = S("%s Battery Box: %d/%d"):format(tier,
+		local infotext = technic.format(S("%s Battery Box: %e/%e"), tier,
 				current_charge, max_charge)
 		if eu_input == 0 then
 			infotext = S("%s Idle"):format(infotext)

technic/machines/register/solar_array.lua

@@ -28,7 +28,7 @@ function technic.register_solar_array(data)
 			local charge_to_give = math.floor((light + pos.y) * data.power)
 			charge_to_give = math.max(charge_to_give, 0)
 			charge_to_give = math.min(charge_to_give, data.power * 50)
-			meta:set_string("infotext", S("%s Active"):format(machine_name).." ("..charge_to_give.."EU)")
+			meta:set_string("infotext", technic.format(S("%s Active (%e EU)"), machine_name, charge_to_give))
 			meta:set_int(tier.."_EU_supply", charge_to_give)
 		else
 			meta:set_string("infotext", S("%s Idle"):format(machine_name))

technic/machines/switching_station.lua

@@ -291,7 +291,7 @@ minetest.register_abm({
 		--dprint("Total BA demand:"..BA_eu_demand)
 
 		meta:set_string("infotext",
-				S("%s. Supply: %d Demand: %d"):format(
+				technic.format(S("%s. Supply: %e Demand: %e"),
 				machine_name, PR_eu_supply, RE_eu_demand))
 
 		-- If the PR supply is enough for the RE demand supply them all