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Server/py: Fix replay to turn 1.
[plomrogue] / plomrogue-server.py
index eb1267157f2a6598c347e10ab7b895721c7090cc..0e42ceeccbaf3d0665a29cecf1e94aae1048a848 100755 (executable)
@@ -6,6 +6,13 @@ import shutil
 import time
 
 
+def strong_write(file, string):
+    """Apply write(string), flush() and os.fsync() to file."""
+    file.write(string)
+    file.flush()
+    os.fsync(file)
+
+
 def setup_server_io():
     """Fill IO files DB with proper file( path)s. Write process IO test string.
 
@@ -25,8 +32,7 @@ def setup_server_io():
     io_db["teststring"] = str(os.getpid()) + " " + str(time.time())
     os.makedirs(io_db["path_server"], exist_ok=True)
     io_db["file_out"] = open(io_db["path_out"], "w")
-    io_db["file_out"].write(io_db["teststring"] + "\n")
-    io_db["file_out"].flush()
+    strong_write(io_db["file_out"], io_db["teststring"] + "\n")
     if os.access(io_db["path_in"], os.F_OK):
         os.remove(io_db["path_in"])
     io_db["file_in"] = open(io_db["path_in"], "w")
@@ -54,10 +60,11 @@ def cleanup_server_io():
 def obey(command, prefix, replay=False, do_record=False):
     """Call function from commands_db mapped to command's first token.
 
-    The command string is tokenized by shlex.split(comments=True). If replay is
-    set, a non-meta command from the commands_db merely triggers obey() on the
-    next command from the records file. If not, and do do_record is set,
-    non-meta commands are recorded via record(), and save_world() is called.
+    Tokenize command string with shlex.split(comments=True). If replay is set,
+    a non-meta command from the commands_db merely triggers obey() on the next
+    command from the records file. If not, non-meta commands set
+    io_db["worldstate_updateable"] to world_db["WORLD_EXISTS"], and, if
+    do_record is set, are recorded via record(), and save_world() is called.
     The prefix string is inserted into the server's input message between its
     beginning 'input ' & ':'. All activity is preceded by a server_test() call.
     """
@@ -71,7 +78,7 @@ def obey(command, prefix, replay=False, do_record=False):
     if len(tokens) > 0 and tokens[0] in commands_db \
        and len(tokens) == commands_db[tokens[0]][0] + 1:
         if commands_db[tokens[0]][1]:
-            commands_db[tokens[0]][2]()
+            commands_db[tokens[0]][2](*tokens[1:])
         elif replay:
             print("Due to replay mode, reading command as 'go on in record'.")
             line = io_db["file_record"].readline()
@@ -86,6 +93,7 @@ def obey(command, prefix, replay=False, do_record=False):
             if do_record:
                 record(command)
                 save_world()
+            io_db["worldstate_updateable"] = world_db["WORLD_ACTIVE"]
     elif 0 != len(tokens):
         print("Invalid command/argument, or bad number of tokens.")
 
@@ -99,9 +107,7 @@ def atomic_write(path, text, do_append=False):
         if os.access(path, os.F_OK):
             shutil.copyfile(path, path_tmp)
     file = open(path_tmp, mode)
-    file.write(text)
-    file.flush()
-    os.fsync(file.fileno())
+    strong_write(file, text)
     file.close()
     if os.access(path, os.F_OK):
         os.remove(path)
@@ -117,40 +123,66 @@ def record(command):
 
 
 def save_world():
-    # Dummy for saving all commands to reconstruct current world state.
-    # Misses same optimizations as record() from the original record().
-    ta_string = ""
-    for id in world_db["ThingActions"]:
-        ta = world_db["ThingActions"][id]
-        ta_string = ta_string + "TA_ID " + str(id) + "\n" + \
-                                "TA_EFFORT " + str(ta["TA_EFFORT"]) + "\n" + \
-                                "TA_NAME '" + ta["TA_NAME"] + "'\n"
-    tt_string = ""
+    """Save all commands needed to reconstruct current world state."""
+    # TODO: Misses same optimizations as record() from the original record().
+
+    def quote(string):
+        string = string.replace("\u005C", '\u005C\u005C')
+        return '"' + string.replace('"', '\u005C"') + '"'
+
+    def mapsetter(key):
+        def helper(id):
+            string = ""
+            if world_db["Things"][id][key]:
+                rmap = world_db["Things"][id][key]
+                length = world_db["MAP_LENGTH"]
+                for i in range(length):
+                    line = rmap[i * length:(i * length) + length].decode()
+                    string = string + key + " " + str(i) + quote(line) + "\n"
+            return string
+        return helper
+
+    def memthing(id):
+        string = ""
+        for memthing in world_db["Things"][id]["T_MEMTHING"]:
+            string = string + "T_MEMTHING " + str(memthing[0]) + " " + \
+                     str(memthing[1]) + " " + str(memthing[2]) + "\n"
+        return string
+
+    def helper(category, id_string, special_keys={}):
+        string = ""
+        for id in world_db[category]:
+            string = string + id_string + " " + str(id) + "\n"
+            for key in world_db[category][id]:
+                if not key in special_keys:
+                    x = world_db[category][id][key]
+                    argument = quote(x) if str == type(x) else str(x)
+                    string = string + key + " " + argument + "\n"
+                elif special_keys[key]:
+                    string = string + special_keys[key](id)
+        return string
+
+    string = ""
+    for key in world_db:
+        if dict != type(world_db[key]):
+            string = string + key + " " + str(world_db[key]) + "\n"
+    string = string + helper("ThingActions", "TA_ID")
+    string = string + helper("ThingTypes", "TT_ID", {"TT_CORPSE_ID": False})
     for id in world_db["ThingTypes"]:
-        tt = world_db["ThingTypes"][id]
-        tt_string = tt_string + "TT_ID " + str(id) + "\n" + \
-                                "TT_CONSUMABLE " + \
-                                str(tt["TT_CONSUMABLE"]) + "\n" + \
-                                "TT_LIFEPOINTS " + \
-                                str(tt["TT_LIFEPOINTS"]) + "\n" + \
-                                "TT_CORPSE_ID " + \
-                                str(tt["TT_CORPSE_ID"]) + "\n" + \
-                                "TT_PROLIFERATE " + \
-                                str(tt["TT_PROLIFERATE"]) + "\n" + \
-                                "TT_START_NUMBER " + \
-                                str(tt["TT_START_NUMBER"]) + "\n" + \
-                                "TT_NAME '" + tt["TT_NAME"] + "'\n" + \
-                                "TT_SYMBOL '" + tt["TT_SYMBOL"] + "'\n"
-    atomic_write(io_db["path_save"],
-                 "WORLD_ACTIVE " + str(world_db["WORLD_ACTIVE"]) + "\n" +
-                 "MAP_LENGTH " + str(world_db["MAP_LENGTH"]) + "\n" +
-                 "PLAYER_TYPE " + str(world_db["PLAYER_TYPE"]) + "\n" +
-                 "TURN " + str(world_db["TURN"]) + "\n" +
-                 "SEED_RANDOMNESS " + str(world_db["SEED_RANDOMNESS"]) + "\n" +
-                 "SEED_MAP " + str(world_db["SEED_MAP"]) + "\n" +
-                 ta_string + tt_string)
-    # TODO: If all this ever does is just writing down what's in world_db, some
-    # loop over its entries should be all that's needed.
+        string = string + "TT_ID " + str(id) + "\n" + "TT_CORPSE_ID " + \
+                 str(world_db["ThingTypes"][id]["TT_CORPSE_ID"]) + "\n"
+    string = string + helper("Things", "T_ID",
+                             {"T_CARRIES": False, "carried": False,
+                              "T_MEMMAP": mapsetter("T_MEMMAP"),
+                              "T_MEMTHING": memthing,
+                              "T_MEMDEPTHMAP": mapsetter("T_MEMDEPTHMAP")})
+    for id in world_db["Things"]:
+        if [] != world_db["Things"][id]["T_CARRIES"]:
+            string = string + "T_ID " + str(id) + "\n"
+            for carried_id in world_db["Things"][id]["T_CARRIES"]:
+                string = string + "T_CARRIES " + str(carried_id) + "\n"
+    string = string + "WORLD_ACTIVE " + str(world_db["WORLD_ACTIVE"])
+    atomic_write(io_db["path_save"], string)
 
 
 def obey_lines_in_file(path, name, do_record=False):
@@ -218,12 +250,41 @@ def read_command():
     return command
 
 
+def try_worldstate_update():
+    """Write worldstate file if io_db["worldstate_updateable"] is set."""
+    if io_db["worldstate_updateable"]:
+        inventory = ""
+        if [] == world_db["Things"][0]["T_CARRIES"]:
+            inventory = "(none)\n"
+        else:
+            for id in world_db["Things"][0]["T_CARRIES"]:
+                type_id = world_db["Things"][id]["T_TYPE"]
+                name = world_db["ThingTypes"][type_id]["TT_NAME"]
+                inventory = inventory + name + "\n"
+        string = str(world_db["TURN"]) + "\n" + \
+                 str(world_db["Things"][0]["T_LIFEPOINTS"]) + "\n" + \
+                 str(world_db["Things"][0]["T_SATIATION"]) + "\n" + \
+                 inventory + "%\n" + \
+                 str(world_db["Things"][0]["T_POSY"]) + "\n" + \
+                 str(world_db["Things"][0]["T_POSX"]) + "\n" + \
+                 str(world_db["MAP_LENGTH"]) + "\n"
+        length = world_db["MAP_LENGTH"]
+        for i in range(length):
+            line = world_db["MAP"][i * length:(i * length) + length].decode()
+            string = string + line + "\n"
+        # TODO: no proper user-subjective map
+        atomic_write(io_db["path_worldstate"], string)
+        strong_write(io_db["file_out"], "WORLD_UPDATED\n")
+        io_db["worldstate_updateable"] = False
+
+
 def replay_game():
     """Replay game from record file.
 
     Use opts.replay as breakpoint turn to which to replay automatically before
     switching to manual input by non-meta commands in server input file
     triggering further reads of record file. Ensure opts.replay is at least 1.
+    Run try_worldstate_update() before each interactive obey()/read_command().
     """
     if opts.replay < 1:
         opts.replay = 1
@@ -242,6 +303,7 @@ def replay_game():
              + str(io_db["file_record"].line_n))
         io_db["file_record"].line_n = io_db["file_record"].line_n + 1
     while True:
+        try_worldstate_update()
         obey(read_command(), "in file", replay=True)
 
 
@@ -250,7 +312,8 @@ def play_game():
 
     If no save file is found, a new world is generated from the commands in the
     world config plus a 'MAKE WORLD [current Unix timestamp]'. Record this
-    command and all that follow via the server input file.
+    command and all that follow via the server input file. Run
+    try_worldstate_update() before each interactive obey()/read_command().
     """
     if os.access(io_db["path_save"], os.F_OK):
         obey_lines_in_file(io_db["path_save"], "save")
@@ -262,12 +325,13 @@ def play_game():
                            do_record=True)
         obey("MAKE_WORLD " + str(int(time.time())), "in file", do_record=True)
     while True:
+        try_worldstate_update()
         obey(read_command(), "in file", do_record=True)
 
 
 def remake_map():
-    # DUMMY.
-    print("I'd (re-)make the map now, if only I knew how.")
+    # DUMMY map creator.
+    world_db["MAP"] = bytearray(b'.' * (world_db["MAP_LENGTH"] ** 2))
 
 
 def set_world_inactive():
@@ -291,19 +355,70 @@ def integer_test(val_string, min, max):
         return None
 
 
-def worlddb_value_setter(key, min, max):
-    """Generate: Set world_db[key] to int(val_string) if >= min and <= max."""
-    def func(val_string):
-        val = integer_test(val_string, min, max)
-        if val:
-            world_db[key] = val
-    return func
+def setter(category, key, min, max):
+    """Build setter for world_db([category + "s"][id])[key] to >=min/<=max."""
+    if category is None:
+        def f(val_string):
+            val = integer_test(val_string, min, max)
+            if None != val:
+                world_db[key] = val
+    else:
+        if category == "Thing":
+            id_store = command_tid
+            decorator = test_Thing_id
+        elif category == "ThingType":
+            id_store = command_ttid
+            decorator = test_ThingType_id
+        elif category == "ThingAction":
+            id_store = command_taid
+            decorator = test_ThingAction_id
+
+        @decorator
+        def f(val_string):
+            val = integer_test(val_string, min, max)
+            if None != val:
+                world_db[category + "s"][id_store.id][key] = val
+    return f
+
+
+def id_setter(id, category, id_store=False, start_at_1=False):
+    """Set ID of object of category to manipulate ID unused? Create new one.
+
+    The ID is stored as id_store.id (if id_store is set). If the integer of the
+    input is valid (if start_at_1, >= 0 and <= 255, else >= -32768 and <=
+    32767), but <0 or (if start_at_1) <1, calculate new ID: lowest unused ID
+    >=0 or (if start_at_1) >= 1, and <= 255. None is always returned when no
+    new object is created, otherwise the new object's ID.
+    """
+    min = 0 if start_at_1 else -32768
+    max = 255 if start_at_1 else 32767
+    if str == type(id):
+        id = integer_test(id, min, max)
+    if None != id:
+        if id in world_db[category]:
+            if id_store:
+                id_store.id = id
+            return None
+        else:
+            if (start_at_1 and 0 == id) \
+               or ((not start_at_1) and (id < 0 or id > 255)):
+                id = -1
+                while 1:
+                    id = id + 1
+                    if id not in world_db[category]:
+                        break
+                if id > 255:
+                    print("Ignoring: "
+                          "No unused ID available to add to ID list.")
+                    return None
+            if id_store:
+                id_store.id = id
+    return id
 
 
 def command_ping():
     """Send PONG line to server output file."""
-    io_db["file_out"].write("PONG\n")
-    io_db["file_out"].flush()
+    strong_write(io_db["file_out"], "PONG\n")
 
 
 def command_quit():
@@ -311,79 +426,99 @@ def command_quit():
     raise SystemExit("received QUIT command")
 
 
+def command_thingshere(y, x):
+    # DUMMY
+    print("Ignoring not-yet implemented THINGS_HERE command.")
+
+
 def command_seedmap(seed_string):
     """Set world_db["SEED_MAP"] to int(seed_string), then (re-)make map."""
-    worlddb_value_setter("SEED_MAP", 0, 4294967295)(seed_string)
+    setter(None, "SEED_MAP", 0, 4294967295)(seed_string)
     remake_map()
 
 
 def command_makeworld(seed_string):
     # DUMMY.
-    worlddb_value_setter("SEED_MAP", 0, 4294967295)(seed_string)
-    worlddb_value_setter("SEED_RANDOMNESS", 0, 4294967295)(seed_string)
-    # TODO: Test for existence of player thing and 'wait' thing action?
+    setter(None, "SEED_RANDOMNESS", 0, 4294967295)(seed_string)
+    player_will_be_generated = False
+    playertype = world_db["PLAYER_TYPE"]
+    for ThingType in world_db["ThingTypes"]:
+        if playertype == ThingType:
+            if 0 < world_db["ThingTypes"][ThingType]["TT_START_NUMBER"]:
+                player_will_be_generated = True
+            break
+    if not player_will_be_generated:
+        print("Ignoring beyond SEED_MAP: " +
+              "No player type with start number >0 defined.")
+        return
+    wait_action = False
+    for ThingAction in world_db["ThingActions"]:
+        if "wait" == world_db["ThingActions"][ThingAction]["TA_NAME"]:
+            wait_action = True
+    if not wait_action:
+        print("Ignoring beyond SEED_MAP: " +
+              "No thing action with name 'wait' defined.")
+        return
+    setter(None, "SEED_MAP", 0, 4294967295)(seed_string)
+    world_db["Things"] = {}
+    remake_map()
+    world_db["WORLD_ACTIVE"] = 1
+    world_db["TURN"] = 1
+    for i in range(world_db["ThingTypes"][playertype]["TT_START_NUMBER"]):
+        world_db["Things"][id_setter(-1, "Things")] = {
+            "T_LIFEPOINTS": world_db["ThingTypes"][playertype]["TT_LIFEPOINTS"],
+            "T_TYPE": playertype,
+            "T_POSY": 0, # randomize safely
+            "T_POSX": 0, # randomize safely
+            "T_ARGUMENT": 0,
+            "T_PROGRESS": 0,
+            "T_SATIATION": 0,
+            "T_COMMAND": 0,
+            "T_CARRIES": [],
+            "carried": False,
+            "T_MEMTHING": [],
+            "T_MEMMAP": False,
+            "T_MEMDEPTHMAP": False
+        }
+    # generate fov map?
+    # TODO: Generate things (player first, with updated memory)
+    strong_write(io_db["file_out"], "NEW_WORLD\n")
 
 
 def command_maplength(maplength_string):
     # DUMMY.
     set_world_inactive()
-    # TODO: remove things, map
-    worlddb_value_setter("MAP_LENGTH", 1, 256)(maplength_string)
+    # TODO: remove map (is this necessary? no memory management trouble …)
+    world_db["Things"] = {}
+    setter(None, "MAP_LENGTH", 1, 256)(maplength_string)
 
 
 def command_worldactive(worldactive_string):
     # DUMMY.
     val = integer_test(worldactive_string, 0, 1)
     if val:
-        if 0 != world_db["WORLD_ACTIVE"] and 0 == val:
-            set_world_inactive()
+        if 0 != world_db["WORLD_ACTIVE"]:
+            if 0 == val:
+                set_world_inactive()
+            else:
+                print("World already active.")
         elif 0 == world_db["WORLD_ACTIVE"]:
             wait_exists = False
+            for ThingAction in world_db["ThingActions"]:
+                if "wait" == world_db["ThingActions"][ThingAction]["TA_NAME"]:
+                    wait_exists = True
+                    break
             player_exists = False
-            map_exists = False
-            # TODO: perform tests:
-            # Is there thing action of name 'wait'?
-            # Is there a player thing?
-            # Is there a map?
+            for Thing in world_db["Things"]:
+                if 0 == Thing:
+                    player_exists = True
+                    break
+            map_exists = "MAP" in world_db
             if wait_exists and player_exists and map_exists:
-                # TODO: rebuild al things' FOVs, map memories
+                # TODO: rebuild all things' FOVs, map memories
                 world_db["WORLD_ACTIVE"] = 1
 
 
-def command_ttid(id_string):
-    """Set ID of ThingType to manipulate. ID unused? Create new ThingType.
-
-    The ID of the ThingType to manipulate is stored as command_ttid.id. If
-    the integer of the input value is valid (>= -32768 and <= 32767), but <0 or
-    >255, a new ID is calculated: the lowest unused ID >=0 and <= 255.
-    """
-    id = integer_test(id_string, -32768, 32767)
-    if None != id:
-        if id in world_db["ThingTypes"]:
-            command_ttid.id = id
-        else:
-            if id < 0 or id > 255:
-                id = -1
-                while 1:
-                    id = id + 1
-                    if id not in world_db["ThingTypes"]:
-                        break
-                if id > 255:
-                    print("Ignoring: "
-                          "No unused ID available to add to ID list.")
-                    return
-            command_ttid.id = id
-            world_db["ThingTypes"][id] = {
-                "TT_NAME": "(none)",
-                "TT_CONSUMABLE": 0,
-                "TT_LIFEPOINTS": 0,
-                "TT_PROLIFERATE": 0,
-                "TT_START_NUMBER": 0,
-                "TT_SYMBOL": "?",
-                "TT_CORPSE_ID": id
-            }
-
-
 def test_for_id_maker(object, category):
     """Return decorator testing for object having "id" attribute."""
     def decorator(f):
@@ -397,28 +532,167 @@ def test_for_id_maker(object, category):
     return decorator
 
 
-test_ThingType_id = test_for_id_maker(command_ttid, "ThingType")
+def command_tid(id_string):
+    """Set ID of Thing to manipulate. ID unused? Create new one.
 
+    Default new Thing's type to the first available ThingType, others: zero.
+    """
+    id = id_setter(id_string, "Things", command_tid)
+    if None != id:
+        if world_db["ThingTypes"] == {}:
+            print("Ignoring: No ThingType to settle new Thing in.")
+            return
+        world_db["Things"][id] = {
+            "T_LIFEPOINTS": 0,
+            "T_ARGUMENT": 0,
+            "T_PROGRESS": 0,
+            "T_SATIATION": 0,
+            "T_COMMAND": 0,
+            "T_TYPE": list(world_db["ThingTypes"].keys())[0],
+            "T_POSY": 0,
+            "T_POSX": 0,
+            "T_CARRIES": [],
+            "carried": False,
+            "T_MEMTHING": [],
+            "T_MEMMAP": False,
+            "T_MEMDEPTHMAP": False
+        }
+
+
+test_Thing_id = test_for_id_maker(command_tid, "Thing")
+
+
+@test_Thing_id
+def command_tcommand(str_int):
+    """Set T_COMMAND of selected Thing."""
+    val = integer_test(str_int, 0, 255)
+    if None != val:
+        if 0 == val or val in world_db["ThingActions"]:
+            world_db["Things"][command_tid.id]["T_COMMAND"] = val
+        else:
+            print("Ignoring: ThingAction ID belongs to no known ThingAction.")
+
+
+@test_Thing_id
+def command_ttype(str_int):
+    """Set T_TYPE of selected Thing."""
+    val = integer_test(str_int, 0, 255)
+    if None != val:
+        if val in world_db["ThingTypes"]:
+            world_db["Things"][command_tid.id]["T_TYPE"] = val
+        else:
+            print("Ignoring: ThingType ID belongs to no known ThingType.")
+
+
+@test_Thing_id
+def command_tcarries(str_int):
+    """Append int(str_int) to T_CARRIES of selected Thing.
 
-def ThingType_value_setter(key, min, max):
-    """Build: Set selected ThingType's [key] to int(val_string) >=min/<=max."""
-    @test_ThingType_id
-    def f(val_string):
-        val = integer_test(val_string, min, max)
+    The ID int(str_int) must not be of the selected Thing, and must belong to a
+    Thing with unset "carried" flag. Its "carried" flag will be set on owning.
+    """
+    val = integer_test(str_int, 0, 255)
+    if None != val:
+        if val == command_tid.id:
+            print("Ignoring: Thing cannot carry itself.")
+        elif val in world_db["Things"] \
+             and not world_db["Things"][val]["carried"]:
+            world_db["Things"][command_tid.id]["T_CARRIES"].append(val)
+            world_db["Things"][val]["carried"] = True
+        else:
+            print("Ignoring: Thing not available for carrying.")
+    # Note that the whole carrying structure is different from the C version:
+    # Carried-ness is marked by a "carried" flag, not by Things containing
+    # Things internally.
+
+
+@test_Thing_id
+def command_tmemthing(str_t, str_y, str_x):
+    """Add (int(str_t), int(str_y), int(str_x)) to selected Thing's T_MEMTHING.
+
+    The type must fit to an existing ThingType, and the position into the map.
+    """
+    type = integer_test(str_t, 0, 255)
+    posy = integer_test(str_y, 0, 255)
+    posx = integer_test(str_x, 0, 255)
+    if None != type and None != posy and None != posx:
+        if type not in world_db["ThingTypes"] \
+           or posy >= world_db["MAP_LENGTH"] or posx >= world_db["MAP_LENGTH"]:
+            print("Ignoring: Illegal value for thing type or position.")
+        else:
+            memthing = (type, posy, posx)
+            world_db["Things"][command_tid.id]["T_MEMTHING"].append(memthing)
+
+
+def setter_map(maptype):
+    """Set selected Thing's map of maptype's int(str_int)-th line to mapline.
+
+    If Thing has no map of maptype yet, initialize it with ' ' bytes first.
+    """
+    @test_Thing_id
+    def helper(str_int, mapline):
+        val = integer_test(str_int, 0, 255)
         if None != val:
-            world_db["ThingTypes"][command_ttid.id][key] = val
-    return f
+            if val >= world_db["MAP_LENGTH"]:
+                print("Illegal value for map line number.")
+            elif len(mapline) != world_db["MAP_LENGTH"]:
+                print("Map line length is unequal map width.")
+            else:
+                length = world_db["MAP_LENGTH"]
+                rmap = None
+                if not world_db["Things"][command_tid.id][maptype]:
+                    rmap = bytearray(b' ' * (length ** 2))
+                else:
+                    rmap = world_db["Things"][command_tid.id][maptype]
+                rmap[val * length:(val * length) + length] = mapline.encode()
+                world_db["Things"][command_tid.id][maptype] = rmap
+    return helper
+
+
+def setter_tpos(axis):
+    """Generate setter for T_POSX or  T_POSY of selected Thing."""
+    @test_Thing_id
+    def helper(str_int):
+        val = integer_test(str_int, 0, 255)
+        if None != val:
+            if val < world_db["MAP_LENGTH"]:
+                world_db["Things"][command_tid.id]["T_POS" + axis] = val
+                # TODO: Delete Thing's FOV, and rebuild it if world is active.
+            else:
+                print("Ignoring: Position is outside of map.")
+    return helper
+
+
+def command_ttid(id_string):
+    """Set ID of ThingType to manipulate. ID unused? Create new one.
+
+    Default new ThingType's TT_SYMBOL to "?", TT_CORPSE_ID to self, others: 0.
+    """
+    id = id_setter(id_string, "ThingTypes", command_ttid)
+    if None != id:
+        world_db["ThingTypes"][id] = {
+            "TT_NAME": "(none)",
+            "TT_CONSUMABLE": 0,
+            "TT_LIFEPOINTS": 0,
+            "TT_PROLIFERATE": 0,
+            "TT_START_NUMBER": 0,
+            "TT_SYMBOL": "?",
+            "TT_CORPSE_ID": id
+        }
+
+
+test_ThingType_id = test_for_id_maker(command_ttid, "ThingType")
 
 
 @test_ThingType_id
 def command_ttname(name):
-    """Set to name TT_NAME of selected ThingType."""
+    """Set TT_NAME of selected ThingType."""
     world_db["ThingTypes"][command_ttid.id]["TT_NAME"] = name
 
 
 @test_ThingType_id
 def command_ttsymbol(char):
-    """Set to char TT_SYMBOL of selected ThingType. """
+    """Set TT_SYMBOL of selected ThingType. """
     if 1 == len(char):
         world_db["ThingTypes"][command_ttid.id]["TT_SYMBOL"] = char
     else:
@@ -427,57 +701,34 @@ def command_ttsymbol(char):
 
 @test_ThingType_id
 def command_ttcorpseid(str_int):
-    """Set to int(str_int) TT_CORPSE_ID of selected ThingType."""
+    """Set TT_CORPSE_ID of selected ThingType."""
     val = integer_test(str_int, 0, 255)
     if None != val:
         if val in world_db["ThingTypes"]:
             world_db["ThingTypes"][command_ttid.id]["TT_CORPSE_ID"] = val
         else:
-            print("Corpse ID belongs to no known object type.")
+            print("Ignoring: Corpse ID belongs to no known ThignType.")
 
 
 def command_taid(id_string):
-    """Set ID of ThingAction to manipulate. ID unused? Create new ThingAction.
+    """Set ID of ThingAction to manipulate. ID unused? Create new one.
 
-    The ID of the ThingAction to manipulate is stored as command_taid.id. If
-    the integer of the input value is valid (>= 0 and <= 255), but 0, a new ID
-    is calculated: The lowest unused ID >0 and <= 255.
+    Default new ThingAction's TA_EFFORT to 1, its TA_NAME to "wait".
     """
-    id = integer_test(id_string, 0, 255)
+    id = id_setter(id_string, "ThingActions", command_taid, True)
     if None != id:
-        if id in world_db["ThingActions"]:
-            command_taid.id = id
-        else:
-            if 0 == id:
-                while 1:
-                    id = id + 1
-                    if id not in world_db["ThingActions"]:
-                        break
-                if id > 255:
-                    print("Ignoring: "
-                          "No unused ID available to add to ID list.")
-                    return
-            command_taid.id = id
-            world_db["ThingActions"][id] = {
-                "TA_EFFORT": 1,
-                "TA_NAME": "wait"
-            }
+        world_db["ThingActions"][id] = {
+            "TA_EFFORT": 1,
+            "TA_NAME": "wait"
+        }
 
 
 test_ThingAction_id = test_for_id_maker(command_taid, "ThingAction")
 
 
-@test_ThingAction_id
-def command_taeffort(str_int):
-    """Set to int(str_int) TA_EFFORT of selected ThingAction."""
-    val = integer_test(str_int, 0, 255)
-    if None != val:
-        world_db["ThingActions"][command_taid.id]["TA_EFFORT"] = val
-
-
 @test_ThingAction_id
 def command_taname(name):
-    """Set to name TA_NAME of selected ThingAction.
+    """Set TA_NAME of selected ThingAction.
 
     The name must match a valid thing action function. If after the name
     setting no ThingAction with name "wait" remains, call set_world_inactive().
@@ -508,35 +759,48 @@ to be called on it.
 commands_db = {
     "QUIT": (0, True, command_quit),
     "PING": (0, True, command_ping),
+    "THINGS_HERE": (2, True, command_thingshere),
     "MAKE_WORLD": (1, False, command_makeworld),
     "SEED_MAP": (1, False, command_seedmap),
-    "SEED_RANDOMNESS": (1, False, worlddb_value_setter("SEED_RANDOMNESS",
-                                                       0, 4294967295)),
-    "TURN": (1, False, worlddb_value_setter("TURN", 0, 65535)),
-    "PLAYER_TYPE": (1, False, worlddb_value_setter("PLAYER_TYPE", 0, 255)),
+    "SEED_RANDOMNESS": (1, False, setter(None, "SEED_RANDOMNESS",
+                                         0, 4294967295)),
+    "TURN": (1, False, setter(None, "TURN", 0, 65535)),
+    "PLAYER_TYPE": (1, False, setter(None, "PLAYER_TYPE", 0, 255)),
     "MAP_LENGTH": (1, False, command_maplength),
     "WORLD_ACTIVE": (1, False, command_worldactive),
     "TA_ID": (1, False, command_taid),
-    "TA_EFFORT": (1, False, command_taeffort),
+    "TA_EFFORT": (1, False, setter("ThingAction", "TA_EFFORT", 0, 255)),
     "TA_NAME": (1, False, command_taname),
     "TT_ID": (1, False, command_ttid),
     "TT_NAME": (1, False, command_ttname),
     "TT_SYMBOL": (1, False, command_ttsymbol),
     "TT_CORPSE_ID": (1, False, command_ttcorpseid),
-    "TT_CONSUMABLE": (1, False, ThingType_value_setter("TT_CONSUMABLE",
-                                                       0, 65535)),
-    "TT_START_NUMBER": (1, False, ThingType_value_setter("TT_START_NUMBER",
-                                                         0, 255)),
-    "TT_PROLIFERATE": (1, False, ThingType_value_setter("TT_PROLIFERATE",
-                                                        0, 255)),
-    "TT_LIFEPOINTS": (1, False, ThingType_value_setter("TT_LIFEPOINTS",
-                                                       0, 255))
+    "TT_CONSUMABLE": (1, False, setter("ThingType", "TT_CONSUMABLE",
+                                       0, 65535)),
+    "TT_START_NUMBER": (1, False, setter("ThingType", "TT_START_NUMBER",
+                                         0, 255)),
+    "TT_PROLIFERATE": (1, False, setter("ThingType", "TT_PROLIFERATE",
+                                        0, 255)),
+    "TT_LIFEPOINTS": (1, False, setter("ThingType", "TT_LIFEPOINTS", 0, 255)),
+    "T_ID": (1, False, command_tid),
+    "T_ARGUMENT": (1, False, setter("Thing", "T_ARGUMENT", 0, 255)),
+    "T_PROGRESS": (1, False, setter("Thing", "T_PROGRESS", 0, 255)),
+    "T_LIFEPOINTS": (1, False, setter("Thing", "T_LIFEPOINTS", 0, 255)),
+    "T_SATIATION": (1, False, setter("Thing", "T_SATIATION", -32768, 32767)),
+    "T_COMMAND": (1, False, command_tcommand),
+    "T_TYPE": (1, False, command_ttype),
+    "T_CARRIES": (1, False, command_tcarries),
+    "T_MEMMAP": (2, False, setter_map("T_MEMMAP")),
+    "T_MEMDEPTHMAP": (2, False, setter_map("T_MEMDEPTHMAP")),
+    "T_MEMTHING": (3, False, command_tmemthing),
+    "T_POSY": (1, False, setter_tpos("Y")),
+    "T_POSX": (1, False, setter_tpos("X")),
 }
 
 
 """World state database. With sane default values."""
 world_db = {
-    "TURN": 1,
+    "TURN": 0,
     "SEED_MAP": 0,
     "SEED_RANDOMNESS": 0,
     "PLAYER_TYPE": 0,
@@ -558,7 +822,8 @@ io_db = {
     "path_out": "server/out",
     "path_worldstate": "server/worldstate",
     "tmp_suffix": "_tmp",
-    "kicked_by_rival": False
+    "kicked_by_rival": False,
+    "worldstate_updateable": False
 }