show recipes visually instead of describing them in text

src/lib/sim/ProductionRules.cpp

@@ -81,6 +81,33 @@ computeShipyardRequiredMaterials(const GameConfig& config,
     }
     return requiredMaterials;
 }
+
+double computeShipyardProductionTimeSeconds(
+    const GameConfig& config, const std::string& recipeId,
+    const std::optional<ShipLayoutConfig>& shipLayout)
+{
+    const ShipDef* shipDef = config.ships.findShipDef(recipeId);
+    if (!shipDef)
+    {
+        return 0.0;
+    }
+
+    double seconds = shipDef->schematic.productionTimeSeconds;
+    if (shipLayout.has_value())
+    {
+        for (const PlacedModule& pm : shipLayout->placedModules)
+        {
+            const ModuleDef* modDef = config.modules.findModuleDef(pm.moduleId);
+            if (!modDef)
+            {
+                continue;
+            }
+            seconds += modDef->productionTimeSeconds;
+        }
+    }
+    return seconds;
+}
+
 bool hasInputsToStart(const GameConfig& config, const Building& b)
 {
     if (b.type == BuildingType::Shipyard)

src/lib/sim/ProductionRules.h

@@ -44,6 +44,12 @@ std::map<std::string, int> computeShipyardRequiredMaterials(
     const GameConfig& config, const std::string& recipeId,
     const std::optional<ShipLayoutConfig>& shipLayout);
 
+// The ship's base production time plus that of every module in the configured layout
+// (REQ-MOD-PRODUCTION-TIME), over a stored configuration as above.
+double computeShipyardProductionTimeSeconds(
+    const GameConfig& config, const std::string& recipeId,
+    const std::optional<ShipLayoutConfig>& shipLayout);
+
 // True when a production cycle could start right now, ignoring output-buffer space.
 bool hasInputsToStart(const GameConfig& config, const Building& b);