From 56ef33ea0e5c6236239b4af43f00cb182c181987 Mon Sep 17 00:00:00 2001
From: Alexander Gavrilov <angavrilov@gmail.com>
Date: Sat, 10 Nov 2012 17:33:05 +0400
Subject: [PATCH] Support building steam engines on top of brooks without any
 down stairs.

---
 library/include/TileTypes.h | 6 ++++++
 library/xml                 | 2 +-
 plugins/steam-engine.cpp    | 8 +++++---
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/library/include/TileTypes.h b/library/include/TileTypes.h
index d21fb3c17..48c10146a 100644
--- a/library/include/TileTypes.h
+++ b/library/include/TileTypes.h
@@ -203,6 +203,12 @@ namespace DFHack
         return ENUM_ATTR(tiletype_shape, passable_flow, tileShape(tiletype));
     }
 
+    inline
+    bool FlowPassableDown(df::tiletype tiletype)
+    {
+        return ENUM_ATTR(tiletype_shape, passable_flow_down, tileShape(tiletype));
+    }
+
     inline
     bool isWalkable(df::tiletype tiletype)
     {
diff --git a/library/xml b/library/xml
index 02e0e0d7b..4b2124957 160000
--- a/library/xml
+++ b/library/xml
@@ -1 +1 @@
-Subproject commit 02e0e0d7b9a7ef708a621ef5511a24bf8657b4a2
+Subproject commit 4b2124957e282683480eaf05922e63c353364ec1
diff --git a/plugins/steam-engine.cpp b/plugins/steam-engine.cpp
index d884191e5..60f38ef83 100644
--- a/plugins/steam-engine.cpp
+++ b/plugins/steam-engine.cpp
@@ -320,7 +320,7 @@ struct workshop_hook : df::building_workshopst {
             for (int y = y1; y <= y2; y++)
             {
                 auto ptile = Maps::getTileType(x,y,z);
-                if (!ptile || !LowPassable(*ptile))
+                if (!ptile || !FlowPassableDown(*ptile))
                     continue;
 
                 auto pltile = Maps::getTileType(x,y,z-1);
@@ -891,7 +891,7 @@ IMPLEMENT_VMETHOD_INTERPOSE(dwarfmode_hook, feed);
  * Scan raws for matching workshop buildings.
  */
 
-static bool find_engines()
+static bool find_engines(color_ostream &out)
 {
     engines.clear();
 
@@ -943,6 +943,8 @@ static bool find_engines()
 
         if (!ws.gear_tiles.empty())
             engines.push_back(ws);
+        else
+            out.printerr("%s has no gear tiles - ignoring.\n", wslist[i]->code.c_str());
     }
 
     return !engines.empty();
@@ -973,7 +975,7 @@ DFhackCExport command_result plugin_onstatechange(color_ostream &out, state_chan
 {
     switch (event) {
     case SC_WORLD_LOADED:
-        if (find_engines())
+        if (find_engines(out))
         {
             out.print("Detected steam engine workshops - enabling plugin.\n");
             enable_hooks(true);