Support custom buildings in dfhack.buildings.getFiltersByType.

Also document it and constructBuilding in Lua API docs.

LUA_API.rst

@@ -971,6 +971,80 @@ Low-level building creation functions;
 More high-level functions are implemented in lua and can be loaded by
 ``require('dfhack.buildings')``. See ``hack/lua/dfhack/buildings.lua``.
 
+Among them are:
+
+* ``dfhack.buildings.getFiltersByType(argtable,type,subtype,custom)``
+
+  Returns a sequence of lua structures, describing input item filters
+  suitable for the specified building type, or *nil* if unknown or invalid.
+  The returned sequence is suitable for use as the ``job_items`` argument
+  of ``constructWithFilters``.
+  Uses tables defined in ``buildings.lua``.
+
+  Argtable members ``material`` (the default name), ``bucket``, ``barrel``,
+  ``chain``, ``mechanism``, ``screw``, ``pipe``, ``anvil``, ``weapon`` are used to
+  augment the basic attributes with more detailed information if the
+  building has input items with the matching name (see the tables for naming details).
+  Note that it is impossible to *override* any properties this way, only supply those that
+  are not mentioned otherwise; one exception is that flags2.non_economic
+  is automatically cleared if an explicit material is specified.
+
+* ``dfhack.buildings.constructBuilding{...}``
+
+  Creates a building in one call, using options contained
+  in the argument table. Returns the building, or *nil, error*.
+
+  **NOTE:** Despite the name, unless the building is abstract,
+  the function creates it in an 'unconstructed' stage, with
+  a queued in-game job that will actually construct it. I.e.
+  the function replicates programmatically what can be done
+  through the construct building menu in the game ui, except
+  that it does less environment constraint checking.
+
+  The following options can be used:
+
+  - ``pos = coordinates``, or ``x = ..., y = ..., z = ...``
+
+    Mandatory. Specifies the left upper corner of the building.
+
+  - ``type = df.building_type.FOO, subtype = ..., custom = ...``
+
+    Mandatory. Specifies the type of the building. Obviously, subtype
+    and custom are only expected if the type requires them.
+
+  - ``fields = { ... }``
+
+    Initializes fields of the building object after creation with ``df.assign``.
+
+  - ``width = ..., height = ..., direction = ...``
+
+    Sets size and orientation of the building. If it is
+    fixed-size, specified dimensions are ignored.
+
+  - ``full_rectangle = true``
+
+    For buildings like stockpiles or farm plots that can normally
+    accomodate individual tile exclusion, forces an error if any
+    tiles within the specified width*height are obstructed.
+
+  - ``items = { item, item ... }``, or ``filters = { {...}, {...}... }``
+
+    Specifies explicit items or item filters to use in construction.
+    It is the job of the user to ensure they are correct for the building type.
+
+  - ``abstract = true``
+
+    Specifies that the building is abstract and does not require construction.
+    Required for stockpiles and civzones; an error otherwise.
+
+  - ``material = {...}, mechanism = {...}, ...``
+
+    If none of ``items``, ``filter``, or ``abstract`` is used,
+    the function uses ``getFiltersByType`` to compute the input
+    item filters, and passes the argument table through. If no filters
+    can be determined this way, ``constructBuilding`` throws an error.
+
+
 Constructions module
 --------------------
 

Lua API.html

@@ -1163,6 +1163,69 @@ Returns <em>true</em> if the building was destroyed and deallocated immediately.
 </ul>
 <p>More high-level functions are implemented in lua and can be loaded by
 <tt class="docutils literal"><span class="pre">require('dfhack.buildings')</span></tt>. See <tt class="docutils literal">hack/lua/dfhack/buildings.lua</tt>.</p>
+<p>Among them are:</p>
+<ul>
+<li><p class="first"><tt class="docutils literal">dfhack.buildings.getFiltersByType(argtable,type,subtype,custom)</tt></p>
+<p>Returns a sequence of lua structures, describing input item filters
+suitable for the specified building type, or <em>nil</em> if unknown or invalid.
+The returned sequence is suitable for use as the <tt class="docutils literal">job_items</tt> argument
+of <tt class="docutils literal">constructWithFilters</tt>.
+Uses tables defined in <tt class="docutils literal">buildings.lua</tt>.</p>
+<p>Argtable members <tt class="docutils literal">material</tt> (the default name), <tt class="docutils literal">bucket</tt>, <tt class="docutils literal">barrel</tt>,
+<tt class="docutils literal">chain</tt>, <tt class="docutils literal">mechanism</tt>, <tt class="docutils literal">screw</tt>, <tt class="docutils literal">pipe</tt>, <tt class="docutils literal">anvil</tt>, <tt class="docutils literal">weapon</tt> are used to
+augment the basic attributes with more detailed information if the
+building has input items with the matching name (see the tables for naming details).
+Note that it is impossible to <em>override</em> any properties this way, only supply those that
+are not mentioned otherwise; one exception is that flags2.non_economic
+is automatically cleared if an explicit material is specified.</p>
+</li>
+<li><p class="first"><tt class="docutils literal"><span class="pre">dfhack.buildings.constructBuilding{...}</span></tt></p>
+<p>Creates a building in one call, using options contained
+in the argument table. Returns the building, or <em>nil, error</em>.</p>
+<p><strong>NOTE:</strong> Despite the name, unless the building is abstract,
+the function creates it in an 'unconstructed' stage, with
+a queued in-game job that will actually construct it. I.e.
+the function replicates programmatically what can be done
+through the construct building menu in the game ui, except
+that it does less environment constraint checking.</p>
+<p>The following options can be used:</p>
+<ul>
+<li><p class="first"><tt class="docutils literal">pos = coordinates</tt>, or <tt class="docutils literal">x = <span class="pre">...,</span> y = <span class="pre">...,</span> z = ...</tt></p>
+<p>Mandatory. Specifies the left upper corner of the building.</p>
+</li>
+<li><p class="first"><tt class="docutils literal">type = df.building_type.FOO, subtype = <span class="pre">...,</span> custom = ...</tt></p>
+<p>Mandatory. Specifies the type of the building. Obviously, subtype
+and custom are only expected if the type requires them.</p>
+</li>
+<li><p class="first"><tt class="docutils literal">fields = { ... }</tt></p>
+<p>Initializes fields of the building object after creation with <tt class="docutils literal">df.assign</tt>.</p>
+</li>
+<li><p class="first"><tt class="docutils literal">width = <span class="pre">...,</span> height = <span class="pre">...,</span> direction = ...</tt></p>
+<p>Sets size and orientation of the building. If it is
+fixed-size, specified dimensions are ignored.</p>
+</li>
+<li><p class="first"><tt class="docutils literal">full_rectangle = true</tt></p>
+<p>For buildings like stockpiles or farm plots that can normally
+accomodate individual tile exclusion, forces an error if any
+tiles within the specified width*height are obstructed.</p>
+</li>
+<li><p class="first"><tt class="docutils literal">items = { item, item ... }</tt>, or <tt class="docutils literal">filters = { <span class="pre">{...},</span> <span class="pre">{...}...</span> }</tt></p>
+<p>Specifies explicit items or item filters to use in construction.
+It is the job of the user to ensure they are correct for the building type.</p>
+</li>
+<li><p class="first"><tt class="docutils literal">abstract = true</tt></p>
+<p>Specifies that the building is abstract and does not require construction.
+Required for stockpiles and civzones; an error otherwise.</p>
+</li>
+<li><p class="first"><tt class="docutils literal">material = <span class="pre">{...},</span> mechanism = <span class="pre">{...},</span> ...</tt></p>
+<p>If none of <tt class="docutils literal">items</tt>, <tt class="docutils literal">filter</tt>, or <tt class="docutils literal">abstract</tt> is used,
+the function uses <tt class="docutils literal">getFiltersByType</tt> to compute the input
+item filters, and passes the argument table through. If no filters
+can be determined this way, <tt class="docutils literal">constructBuilding</tt> throws an error.</p>
+</li>
+</ul>
+</li>
+</ul>
 </div>
 <div class="section" id="constructions-module">
 <h3><a class="toc-backref" href="#id21">Constructions module</a></h3>

library/lua/dfhack/buildings.lua

@@ -4,7 +4,32 @@ local buildings = dfhack.buildings
 
 local utils = require 'utils'
 
---[[ Building input material tables. ]]
+-- Uninteresting values for filter attributes when reading them from DF memory.
+-- Differs from the actual defaults of the job_item constructor in allow_artifact.
+
+buildings.input_filter_defaults = {
+    item_type = -1,
+    item_subtype = -1,
+    mat_type = -1,
+    mat_index = -1,
+    flags1 = {},
+    -- Instead of noting those that allow artifacts, mark those that forbid them.
+    -- Leaves actually enabling artifacts to the discretion of the API user,
+    -- which is the right thing because unlike the game UI these filters are
+    -- used in a way that does not give the user a chance to choose manually.
+    flags2 = { allow_artifact = true },
+    flags3 = {},
+    flags4 = 0,
+    flags5 = 0,
+    reaction_class = '',
+    has_material_reaction_product = '',
+    metal_ore = -1,
+    min_dimension = -1,
+    has_tool_use = -1,
+    quantity = 1
+}
+
+--[[ Building input material table. ]]
 
 local building_inputs = {
     [df.building_type.Chair] = { { item_type=df.item_type.CHAIR, vector_id=df.job_item_vector_id.CHAIR } },
@@ -12,7 +37,6 @@ local building_inputs = {
     [df.building_type.Table] = { { item_type=df.item_type.TABLE, vector_id=df.job_item_vector_id.TABLE } },
     [df.building_type.Coffin] = { { item_type=df.item_type.COFFIN, vector_id=df.job_item_vector_id.COFFIN } },
     [df.building_type.FarmPlot] = { },
-    [df.building_type.Furnace] = { { flags2={ building_material=true, fire_safe=true, non_economic=true } } },
     [df.building_type.TradeDepot] = { { flags2={ building_material=true, non_economic=true }, quantity=3 } },
     [df.building_type.Door] = { { item_type=df.item_type.DOOR, vector_id=df.job_item_vector_id.DOOR } },
     [df.building_type.Floodgate] = {
@@ -40,7 +64,6 @@ local building_inputs = {
             vector_id=df.job_item_vector_id.ARMORSTAND
         }
     },
-    [df.building_type.Workshop] = { { flags2={ building_material=true, non_economic=true } } },
     [df.building_type.Cabinet] = {
         { item_type=df.item_type.CABINET, vector_id=df.job_item_vector_id.CABINET }
     },
@@ -89,7 +112,7 @@ local building_inputs = {
     [df.building_type.ArcheryTarget] = { { flags2={ building_material=true, non_economic=true } } },
     [df.building_type.Chain] = { { item_type=df.item_type.CHAIN, vector_id=df.job_item_vector_id.CHAIN } },
     [df.building_type.Cage] = { { item_type=df.item_type.CAGE, vector_id=df.job_item_vector_id.CAGE } },
-    [df.building_type.Weapon] = { { vector_id=df.job_item_vector_id.ANY_SPIKE } },
+    [df.building_type.Weapon] = { { name='weapon', vector_id=df.job_item_vector_id.ANY_SPIKE } },
     [df.building_type.ScrewPump] = {
         {
             item_type=df.item_type.BLOCKS,
@@ -158,6 +181,8 @@ local building_inputs = {
     [df.building_type.Hive] = { { has_tool_use=df.tool_uses.HIVE, item_type=df.item_type.TOOL } }
 }
 
+--[[ Furnace building input material table. ]]
+
 local furnace_inputs = {
     [df.furnace_type.WoodFurnace] = { { flags2={ building_material=true, fire_safe=true, non_economic=true } } },
     [df.furnace_type.Smelter] = { { flags2={ building_material=true, fire_safe=true, non_economic=true } } },
@@ -168,6 +193,8 @@ local furnace_inputs = {
     [df.furnace_type.MagmaKiln] = { { flags2={ building_material=true, magma_safe=true, non_economic=true } } }
 }
 
+--[[ Workshop building input material table. ]]
+
 local workshop_inputs = {
     [df.workshop_type.Carpenters] = { { flags2={ building_material=true, non_economic=true } } },
     [df.workshop_type.Farmers] = { { flags2={ building_material=true, non_economic=true } } },
@@ -250,6 +277,8 @@ local workshop_inputs = {
     }
 }
 
+--[[ Trap building input material table. ]]
+
 local trap_inputs = {
     [df.trap_type.StoneFallTrap] = {
         {
@@ -264,7 +293,10 @@ local trap_inputs = {
             item_type=df.item_type.TRAPPARTS,
             vector_id=df.job_item_vector_id.TRAPPARTS
         },
-        { vector_id=df.job_item_vector_id.ANY_WEAPON }
+        {
+            name='weapon',
+            vector_id=df.job_item_vector_id.ANY_WEAPON
+        }
     },
     [df.trap_type.Lever] = {
         {
@@ -289,11 +321,28 @@ local trap_inputs = {
     }
 }
 
+--[[ Functions for lookup in tables. ]]
+
+local function get_custom_inputs(custom)
+    local defn = df.building_def.find(custom)
+    if defn ~= nil then
+        return utils.clone_with_default(defn.build_items, buildings.input_filter_defaults)
+    end
+end
+
 local function get_inputs_by_type(type,subtype,custom)
     if type == df.building_type.Workshop then
+        if subtype == df.workshop_type.Custom then
+            return get_custom_inputs(custom)
+        else
             return workshop_inputs[subtype]
+        end
     elseif type == df.building_type.Furnace then
+        if subtype == df.furnace_type.Custom then
+            return get_custom_inputs(custom)
+        else
             return furnace_inputs[subtype]
+        end
     elseif type == df.building_type.Trap then
         return trap_inputs[subtype]
     else
@@ -357,7 +406,7 @@ end
       -- Materials:
         items = { item, item ... },
       -- OR
-        filter = { { ... }, { ... }... }
+        filters = { { ... }, { ... }... }
       -- OR
         abstract = true
       -- OR

library/lua/utils.lua

@@ -221,6 +221,68 @@ function clone(obj,deep)
     end
 end
 
+local function get_default(default,key,base)
+    if type(default) == 'table' then
+        local dv = default[key]
+        if dv == nil then
+            dv = default._default
+        end
+        if dv == nil then
+            dv = base
+        end
+        return dv
+    else
+        return default
+    end
+end
+
+-- Copy the object as lua data structures, skipping values matching defaults.
+function clone_with_default(obj,default,force)
+    local rv = nil
+    local function setrv(k,v)
+        if v ~= nil then
+            if rv == nil then
+                rv = {}
+            end
+            rv[k] = v
+        end
+    end
+    if default == nil then
+        return nil
+    elseif type(obj) == 'table' then
+        for k,v in pairs(obj) do
+            setrv(k, clone_with_default(v, get_default(default,k)))
+        end
+    elseif df.isvalid(obj) == 'ref' then
+        local kind = obj._kind
+        if kind == 'primitive' then
+            return clone_with_default(obj.value,default,force)
+        elseif kind == 'bitfield' then
+            for k,v in pairs(obj) do
+                setrv(k, clone_with_default(v, get_default(default,k,false)))
+            end
+        elseif kind == 'container' then
+            for k,v in ipairs(obj) do
+                setrv(k+1, clone_with_default(v, default, true))
+            end
+        else -- struct
+            for k,v in pairs(obj) do
+                setrv(k, clone_with_default(v, get_default(default,k)))
+            end
+        end
+    elseif obj == default and not force then
+        return nil
+    elseif obj == nil then
+        return NULL
+    else
+        return obj
+    end
+    if force and rv == nil then
+        rv = {}
+    end
+    return rv
+end
+
 -- Sort a vector or lua table
 function sort_vector(vector,field,cmp)
     local fcmp = compare_field(field,cmp)

scripts/devel/list-filters.lua

@@ -1,43 +1,29 @@
 -- List input items for the building currently being built.
+--
+-- This is where the filters in lua/dfhack/buildings.lua come from.
 
 local dumper = require 'dumper'
+local utils = require 'utils'
+local buildings = require 'dfhack.buildings'
 
-local function copy_flags(tgt,src,name)
+local function name_enum(tgt,name,ename,enum)
-    local val = src[name]
+    if tgt[name] ~= nil then
-    if val.whole == 0 then
+        tgt[name] = ename..'.'..enum[tgt[name]]
-        return
-    end
-    local out = {}
-    tgt[name] = out
-    for k,v in pairs(val) do
-        if v then
-            out[k] = v
-        end
-    end
-end
-
-local function copy_value(tgt,src,name,defval)
-    if src[name] ~= defval then
-        tgt[name] = src[name]
-    end
-end
-local function copy_enum(tgt,src,name,defval,ename,enum)
-    if src[name] ~= defval then
-        tgt[name] = ename..'.'..enum[src[name]]
     end
 end
 
 local lookup = {}
+local items = df.global.world.items
 
 for i=df.job_item_vector_id._first_item,df.job_item_vector_id._last_item do
     local id = df.job_item_vector_id.attrs[i].other
     local ptr
     if id == df.items_other_id.ANY then
-        ptr = df.global.world.items.all
+        ptr = items.all
     elseif id == df.items_other_id.BAD then
-        ptr = df.global.world.items.bad
+        ptr = items.bad
     else
-        ptr = df.global.world.items.other[id]
+        ptr = items.other[id]
     end
     if ptr then
         local _,addr = df.sizeof(ptr)
@@ -46,23 +32,12 @@ for i=df.job_item_vector_id._first_item,df.job_item_vector_id._last_item do
 end
 
 local function clone_filter(src,quantity)
-    local tgt = {}
+    local tgt = utils.clone_with_default(src, buildings.input_filter_defaults, true)
-    src.flags2.allow_artifact = false
     if quantity ~= 1 then
         tgt.quantity = quantity
     end
-    copy_enum(tgt, src, 'item_type', -1, 'df.item_type', df.item_type)
+    name_enum(tgt, 'item_type', 'df.item_type', df.item_type)
-    copy_value(tgt, src, 'item_subtype', -1)
+    name_enum(tgt, 'has_tool_use', 'df.tool_uses', df.tool_uses)
-    copy_value(tgt, src, 'mat_type', -1)
-    copy_value(tgt, src, 'mat_index', -1)
-    copy_flags(tgt, src, 'flags1')
-    copy_flags(tgt, src, 'flags2')
-    copy_flags(tgt, src, 'flags3')
-    copy_value(tgt, src, 'reaction_class', '')
-    copy_value(tgt, src, 'has_material_reaction_product', '')
-    copy_value(tgt, src, 'metal_ore', -1)
-    copy_value(tgt, src, 'min_dimension', -1)
-    copy_enum(tgt, src, 'has_tool_use', -1, 'df.tool_uses', df.tool_uses)
     local ptr = src.item_vector
     if ptr and ptr ~= df.global.world.items.other[0] then
         local _,addr = df.sizeof(ptr)
@@ -78,8 +53,9 @@ local function dump(name)
     end
 
     local fmt = dumper.DataDumper(out,name,false,1,4)
-    local out = string.gsub(fmt, '"', '')
+    fmt = string.gsub(fmt, '"(df%.[^"]+)"','%1')
-    print(out)
+    fmt = string.gsub(fmt, '%s+$', '')
+    print(fmt)
 end
 
 local itype = df.global.ui_build_selector.building_type