Add "regrass" plugin, regrows grass for pre-0.31.19 fortresses

plugins/CMakeLists.txt

@@ -61,6 +61,7 @@ DFHACK_PLUGIN(initflags initflags.cpp)
 DFHACK_PLUGIN(stockpiles stockpiles.cpp)
 DFHACK_PLUGIN(rename rename.cpp)
 DFHACK_PLUGIN(fixwagons fixwagons.cpp)
+DFHACK_PLUGIN(regrass regrass.cpp)
 #DFHACK_PLUGIN(versionosd versionosd.cpp)
 
 # this is the skeleton plugin. If you want to make your own, make a copy and then change it

plugins/regrass.cpp

@@ -0,0 +1,83 @@
+// All above-ground soil not covered by buildings will be covered with grass.
+// Necessary for worlds generated prior to version 0.31.19 - otherwise, outdoor shrubs and trees no longer grow.
+
+#include "Core.h"
+#include <Console.h>
+#include <Export.h>
+#include <PluginManager.h>
+
+#include <DataDefs.h>
+#include <TileTypes.h>
+#include <df/world.h>
+#include <df/map_block.h>
+
+using std::string;
+using std::vector;
+using namespace DFHack;
+
+using df::global::world;
+using df::map_block;
+
+DFhackCExport command_result df_regrass (Core * c, vector <string> & parameters)
+{
+	if (!parameters.empty())
+		return CR_WRONG_USAGE;
+
+        CoreSuspender suspend(c);
+
+	int count = 0;
+	for (int i = 0; i < world->map.map_blocks.size(); i++)
+	{
+		map_block *cur = world->map.map_blocks[i];
+		for (int x = 0; x < 16; x++)
+		{
+			for (int y = 0; y < 16; y++)
+			{
+				if (DFHack::tileShape(cur->tiletype[x][y]) != DFHack::FLOOR)
+					continue;
+				if (DFHack::tileMaterial(cur->tiletype[x][y]) != DFHack::SOIL)
+					continue;
+				if (cur->designation[x][y].bits.subterranean)
+					continue;
+				if (cur->occupancy[x][y].bits.building)
+					continue;
+
+				switch (rand() % 8)
+				{
+				// light grass
+				case 0:	cur->tiletype[x][y] = 0x015C;	break;
+				case 1:	cur->tiletype[x][y] = 0x015D;	break;
+				case 2:	cur->tiletype[x][y] = 0x015E;	break;
+				case 3:	cur->tiletype[x][y] = 0x015F;	break;
+				// dark grass
+				case 4:	cur->tiletype[x][y] = 0x018E;	break;
+				case 5:	cur->tiletype[x][y] = 0x018F;	break;
+				case 6:	cur->tiletype[x][y] = 0x0190;	break;
+				case 7:	cur->tiletype[x][y] = 0x0191;	break;
+				}
+				count++;
+			}
+		}
+	}
+
+	if (count)
+		c->con.print("Regrew %d tiles of grass.\n", count);
+	return CR_OK;
+}
+
+DFhackCExport const char *plugin_name ( void )
+{
+	return "regrass";
+}
+
+DFhackCExport command_result plugin_init (Core *c, std::vector<PluginCommand> &commands)
+{
+	commands.clear();
+	commands.push_back(PluginCommand("regrass", "Regrows all surface grass, restoring outdoor plant growth for pre-0.31.19 worlds.", df_regrass));
+	return CR_OK;
+}
+
+DFhackCExport command_result plugin_shutdown ( Core * c )
+{
+	return CR_OK;
+}