Debug: Add vehicle index and flag dump to NewGRF debug window

src/newgrf_debug_gui.cpp

@@ -11,6 +11,7 @@
 
 #include "stdafx.h"
 #include <stdarg.h>
+#include <functional>
 #include "window_gui.h"
 #include "window_func.h"
 #include "fileio_func.h"
@@ -199,6 +200,8 @@ public:
 		return NULL;
 	}
 
+	virtual void ExtraInfo(uint index, std::function<void(const char *)> print) const {}
+
 protected:
 	/**
 	 * Helper to make setting the strings easier.
@@ -292,6 +295,8 @@ struct NewGRFInspectWindow : Window {
 
 	Scrollbar *vscroll;
 
+	int first_variable_line_index = 0;
+
 	/**
 	 * Check whether the given variable has a parameter.
 	 * @param variable the variable to check.
@@ -459,6 +464,17 @@ struct NewGRFInspectWindow : Window {
 		const void *base_spec = nih->GetSpec(index);
 
 		uint i = 0;
+
+		nih->ExtraInfo(index, [&](const char *buf) {
+			int offset = i++;
+			offset -= this->vscroll->GetPosition();
+			if (offset < 0 || offset >= this->vscroll->GetCapacity()) return;
+
+			::DrawString(r.left + LEFT_OFFSET, r.right - RIGHT_OFFSET, r.top + TOP_OFFSET + (offset * this->resize.step_height), buf, TC_BLACK);
+		});
+
+		const_cast<NewGRFInspectWindow*>(this)->first_variable_line_index = i;
+
 		if (nif->variables != NULL) {
 			this->DrawString(r, i++, "Variables:");
 			for (const NIVariable *niv = nif->variables; niv->name != NULL; niv++) {
@@ -586,6 +602,8 @@ struct NewGRFInspectWindow : Window {
 				/* Get the line, make sure it's within the boundaries. */
 				int line = this->vscroll->GetScrolledRowFromWidget(pt.y, this, WID_NGRFI_MAINPANEL, TOP_OFFSET);
 				if (line == INT_MAX) return;
+				if (line < this->first_variable_line_index) return;
+				line -= this->first_variable_line_index;
 
 				/* Find the variable related to the line */
 				for (const NIVariable *niv = nif->variables; niv->name != NULL; niv++, line--) {

src/table/newgrf_debug_data.h

@@ -82,6 +82,19 @@ class NIHVehicle : public NIHelper {
 		VehicleResolverObject ro(v->engine_type, v, VehicleResolverObject::WO_CACHED);
 		return ro.GetScope(VSG_SCOPE_SELF)->GetVariable(var, param, avail);
 	}
+
+	/* virtual */ void ExtraInfo(uint index, std::function<void(const char *)> print) const
+	{
+		char buffer[1024];
+		Vehicle *v = Vehicle::Get(index);
+		print("Debug Info:");
+		seprintf(buffer, lastof(buffer), "  Index: %u", index);
+		print(buffer);
+		char *b = buffer;
+		b += seprintf(b, lastof(buffer), "  Flags: ");
+		b = v->DumpVehicleFlags(b, lastof(buffer));
+		print(buffer);
+	}
 };
 
 static const NIFeature _nif_vehicle = {