home · contact · privacy
Server/py: Fix memdepthmapping bug.
[plomrogue] / plomrogue-server.py
index db5789bfb2eadad09d062ab625796ee52d6e6b36..a44f751313a057e04c432f5ba48df264a9d4e222 100755 (executable)
@@ -4,6 +4,52 @@ import os
 import shlex
 import shutil
 import time
+import ctypes
+
+
+class RandomnessIO:
+    """"Interface to libplomrogue's pseudo-randomness generator."""
+
+    def set_seed(self, seed):
+        libpr.seed_rrand(1, seed)
+
+    def get_seed(self):
+        return libpr.seed_rrand(0, 0)
+
+    def next(self):
+        return libpr.rrand()
+
+    seed = property(get_seed, set_seed)
+
+
+def prep_library():
+    """Prepare ctypes library at ./libplomrogue.so"""
+    libpath = ("./libplomrogue.so")
+    if not os.access(libpath, os.F_OK):
+        raise SystemExit("No library " + libpath + ", run ./compile.sh first?")
+    libpr = ctypes.cdll.LoadLibrary(libpath)
+    libpr.seed_rrand.argtypes = [ctypes.c_uint8, ctypes.c_uint32]
+    libpr.seed_rrand.restype = ctypes.c_uint32
+    libpr.rrand.argtypes = []
+    libpr.rrand.restype = ctypes.c_uint16
+    libpr.set_maplength.argtypes = [ctypes.c_uint16]
+    libpr.mv_yx_in_dir_legal_wrap.argtypes = [ctypes.c_char, ctypes.c_uint8,
+                                              ctypes.c_uint8]
+    libpr.mv_yx_in_dir_legal_wrap.restype = ctypes.c_uint8
+    libpr.result_y.restype = ctypes.c_uint8
+    libpr.result_x.restype = ctypes.c_uint8
+    libpr.set_maplength(world_db["MAP_LENGTH"])
+    libpr.build_fov_map.argtypes = [ctypes.c_uint8, ctypes.c_uint8,
+                                    ctypes.c_char_p, ctypes.c_char_p]
+    libpr.build_fov_map.restype = ctypes.c_uint8
+    return libpr
+
+
+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():
@@ -25,8 +71,7 @@ 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")
@@ -54,12 +99,13 @@ 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. Non-meta commands are recorded in
-    non-replay mode if do_record is set. The prefix string is inserted into the
-    server's input message between its beginning 'input ' and ':'. All activity
-    is preceded by a call to server_test().
+    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.
     """
     server_test()
     print("input " + prefix + ": " + command)
@@ -69,9 +115,9 @@ def obey(command, prefix, replay=False, do_record=False):
         print("Can't tokenize command string: " + str(err) + ".")
         return
     if len(tokens) > 0 and tokens[0] in commands_db \
-       and len(tokens) >= commands_db[tokens[0]][0] + 1:
+       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()
@@ -82,29 +128,104 @@ def obey(command, prefix, replay=False, do_record=False):
             else:
                 print("Reached end of record file.")
         else:
-            commands_db[tokens[0]][2]()
+            commands_db[tokens[0]][2](*tokens[1:])
             if do_record:
                 record(command)
-    else:
+                save_world()
+            io_db["worldstate_updateable"] = world_db["WORLD_ACTIVE"]
+    elif 0 != len(tokens):
         print("Invalid command/argument, or bad number of tokens.")
 
 
+def atomic_write(path, text, do_append=False):
+    """Atomic write of text to file at path, appended if do_append is set."""
+    path_tmp = path + io_db["tmp_suffix"]
+    mode = "w"
+    if do_append:
+        mode = "a"
+        if os.access(path, os.F_OK):
+            shutil.copyfile(path, path_tmp)
+    file = open(path_tmp, mode)
+    strong_write(file, text)
+    file.close()
+    if os.access(path, os.F_OK):
+        os.remove(path)
+    os.rename(path_tmp, path)
+
+
 def record(command):
     """Append command string plus newline to record file. (Atomic.)"""
     # This misses some optimizations from the original record(), namely only
     # finishing the atomic write with expensive flush() and fsync() every 15
     # seconds unless explicitely forced. Implement as needed.
-    path_tmp = io_db["path_record"] + io_db["tmp_suffix"]
-    if os.access(io_db["path_record"], os.F_OK):
-        shutil.copyfile(io_db["path_record"], path_tmp)
-    file = open(path_tmp, "a")
-    file.write(command + "\n")
-    file.flush()
-    os.fsync(file.fileno())
-    file.close()
-    if os.access(io_db["path_record"], os.F_OK):
-        os.remove(io_db["path_record"])
-    os.rename(path_tmp, io_db["path_record"])
+    atomic_write(io_db["path_record"], command + "\n", do_append=True)
+
+
+def save_world():
+    """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]:
+                map = world_db["Things"][id][key]
+                length = world_db["MAP_LENGTH"]
+                for i in range(length):
+                    line = map[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]) and key != "MAP" and \
+           key != "WORLD_ACTIVE" and key != "SEED_MAP":
+            string = string + key + " " + str(world_db[key]) + "\n"
+    string = string + "SEED_MAP " + str(world_db["SEED_MAP"]) + "\n"
+    string = string + helper("ThingActions", "TA_ID")
+    string = string + helper("ThingTypes", "TT_ID", {"TT_CORPSE_ID": False})
+    for id in world_db["ThingTypes"]:
+        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, "fovmap": False,
+                              "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 + "SEED_RANDOMNESS " + str(rand.seed) + "\n" + \
+             "WORLD_ACTIVE " + str(world_db["WORLD_ACTIVE"])
+    atomic_write(io_db["path_save"], string)
 
 
 def obey_lines_in_file(path, name, do_record=False):
@@ -153,11 +274,11 @@ def read_command():
     Keep building return string until a newline is encountered. Pause between
     unsuccessful reads, and after too much waiting, run server_test().
     """
-    wait_on_fail = 1
+    wait_on_fail = 0.03333
     max_wait = 5
     now = time.time()
     command = ""
-    while 1:
+    while True:
         add = io_db["file_in"].readline()
         if len(add) > 0:
             command = command + add
@@ -172,15 +293,616 @@ def read_command():
     return command
 
 
-def command_makeworld():
-    """Mere dummy so far."""
-    print("I would build a whole world now if only I knew how.")
+def try_worldstate_update():
+    """Write worldstate file if io_db["worldstate_updateable"] is set."""
+    if io_db["worldstate_updateable"]:
+
+        def draw_visible_Things(map, run):
+            for id in world_db["Things"]:
+                type = world_db["Things"][id]["T_TYPE"]
+                consumable = world_db["ThingTypes"][type]["TT_CONSUMABLE"]
+                alive = world_db["ThingTypes"][type]["TT_LIFEPOINTS"]
+                if (0 == run and not consumable and not alive) \
+                   or (1 == run and consumable and not alive) \
+                   or (2 == run and alive):
+                    y = world_db["Things"][id]["T_POSY"]
+                    x = world_db["Things"][id]["T_POSX"]
+                    fovflag = world_db["Things"][0]["fovmap"][(y * length) + x]
+                    if 'v' == chr(fovflag):
+                        c = world_db["ThingTypes"][type]["TT_SYMBOL"]
+                        map[(y * length) + x] = ord(c)
+
+        def write_map(string, map):
+            for i in range(length):
+                line = map[i * length:(i * length) + length].decode()
+                string = string + line + "\n"
+            return string
+
+        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"]
+        fov = bytearray(b' ' * (length ** 2))
+        for pos in range(length ** 2):
+            if 'v' == chr(world_db["Things"][0]["fovmap"][pos]):
+                fov[pos] = world_db["MAP"][pos]
+        for i in range(3):
+            draw_visible_Things(fov, i)
+        string = write_map(string, fov)
+        mem = world_db["Things"][0]["T_MEMMAP"][:]
+        for i in range(2):
+            for mt in world_db["Things"][0]["T_MEMTHING"]:
+                consumable = world_db["ThingTypes"][mt[0]]["TT_CONSUMABLE"]
+                if (i == 0 and not consumable) or (i == 1 and consumable):
+                    c = world_db["ThingTypes"][mt[0]]["TT_SYMBOL"]
+                    mem[(mt[1] * length) + mt[2]] = ord(c)
+        string = write_map(string, mem)
+        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
+    print("Replay mode. Auto-replaying up to turn " + str(opts.replay) +
+          " (if so late a turn is to be found).")
+    if not os.access(io_db["path_record"], os.F_OK):
+        raise SystemExit("No record file found to replay.")
+    io_db["file_record"] = open(io_db["path_record"], "r")
+    io_db["file_record"].prefix = "record file line "
+    io_db["file_record"].line_n = 1
+    while world_db["TURN"] < opts.replay:
+        line = io_db["file_record"].readline()
+        if "" == line:
+            break
+        obey(line.rstrip(), io_db["file_record"].prefix
+             + 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)
+
+
+def play_game():
+    """Play game by server input file commands. Before, load save file found.
+
+    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. 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")
+    else:
+        if not os.access(io_db["path_worldconf"], os.F_OK):
+            msg = "No world config file from which to start a new world."
+            raise SystemExit(msg)
+        obey_lines_in_file(io_db["path_worldconf"], "world config ",
+                           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():
+    """(Re-)make island map.
+
+    Let "~" represent water, "." land, "X" trees: Build island shape randomly,
+    start with one land cell in the middle, then go into cycle of repeatedly
+    selecting a random sea cell and transforming it into land if it is neighbor
+    to land. The cycle ends when a land cell is due to be created at the map's
+    border. Then put some trees on the map (TODO: more precise algorithm desc).
+    """
+    def is_neighbor(coordinates, type):
+        y = coordinates[0]
+        x = coordinates[1]
+        length = world_db["MAP_LENGTH"]
+        ind = y % 2
+        diag_west = x + (ind > 0)
+        diag_east = x + (ind < (length - 1))
+        pos = (y * length) + x
+        if (y > 0 and diag_east
+            and type == chr(world_db["MAP"][pos - length + ind])) \
+           or (x < (length - 1)
+               and type == chr(world_db["MAP"][pos + 1])) \
+           or (y < (length - 1) and diag_east
+               and type == chr(world_db["MAP"][pos + length + ind])) \
+           or (y > 0 and diag_west
+               and type == chr(world_db["MAP"][pos - length - (not ind)])) \
+           or (x > 0
+               and type == chr(world_db["MAP"][pos - 1])) \
+           or (y < (length - 1) and diag_west
+               and type == chr(world_db["MAP"][pos + length - (not ind)])):
+            return True
+        return False
+    store_seed = rand.seed
+    rand.seed = world_db["SEED_MAP"]
+    world_db["MAP"] = bytearray(b'~' * (world_db["MAP_LENGTH"] ** 2))
+    length = world_db["MAP_LENGTH"]
+    add_half_width = (not (length % 2)) * int(length / 2)
+    world_db["MAP"][int((length ** 2) / 2) + add_half_width] = ord(".")
+    while (1):
+        y = rand.next() % length
+        x = rand.next() % length
+        pos = (y * length) + x
+        if "~" == chr(world_db["MAP"][pos]) and is_neighbor((y, x), "."):
+            if y == 0 or y == (length - 1) or x == 0 or x == (length - 1):
+                break
+            world_db["MAP"][pos] = ord(".")
+    n_trees = int((length ** 2) / 16)
+    i_trees = 0
+    while (i_trees <= n_trees):
+        single_allowed = rand.next() % 32
+        y = rand.next() % length
+        x = rand.next() % length
+        pos = (y * length) + x
+        if "." == chr(world_db["MAP"][pos]) \
+          and ((not single_allowed) or is_neighbor((y, x), "X")):
+            world_db["MAP"][pos] = ord("X")
+            i_trees += 1
+    rand.seed = store_seed
+    # This all-too-precise replica of the original C code misses iter_limit().
+
+
+def update_map_memory(t):
+    """Update t's T_MEMMAP with what's in its FOV now,age its T_MEMMEPTHMAP."""
+    if not t["T_MEMMAP"]:
+        t["T_MEMMAP"] = bytearray(b' ' * (world_db["MAP_LENGTH"] ** 2))
+    if not t["T_MEMDEPTHMAP"]:
+        t["T_MEMDEPTHMAP"] = bytearray(b' ' * (world_db["MAP_LENGTH"] ** 2))
+    for pos in range(world_db["MAP_LENGTH"] ** 2):
+        if "v" == chr(t["fovmap"][pos]):
+            t["T_MEMDEPTHMAP"][pos] = ord("0")
+            if " " == chr(t["T_MEMMAP"][pos]):
+                t["T_MEMMAP"][pos] = world_db["MAP"][pos]
+            continue
+        if ord('0') <= t["T_MEMDEPTHMAP"][pos] \
+           and ord('9') > t["T_MEMDEPTHMAP"][pos] \
+           and not rand.next() % (2 ** (t["T_MEMDEPTHMAP"][pos] - 48)):
+            t["T_MEMDEPTHMAP"][pos] += 1
+    for mt in [mt for mt in t["T_MEMTHING"]
+               if "v" == chr(t["fovmap"][(mt[1] * world_db["MAP_LENGTH"])
+                                         + mt[2]])]:
+            t["T_MEMTHING"].remove(mt)
+    for id in world_db["Things"]:
+        type = world_db["Things"][id]["T_TYPE"]
+        if not world_db["ThingTypes"][type]["TT_LIFEPOINTS"]:
+            y = world_db["Things"][id]["T_POSY"]
+            x = world_db["Things"][id]["T_POSX"]
+            if "v" == chr(t["fovmap"][(y * world_db["MAP_LENGTH"]) + x]):
+                t["T_MEMTHING"].append((type, y, x))
+
+
+def set_world_inactive():
+    """Set world_db["WORLD_ACTIVE"] to 0 and remove worldstate file."""
+    server_test()
+    if os.access(io_db["path_worldstate"], os.F_OK):
+        os.remove(io_db["path_worldstate"])
+    world_db["WORLD_ACTIVE"] = 0
+
+
+def integer_test(val_string, min, max):
+    """Return val_string if possible integer >= min and <= max, else None."""
+    try:
+        val = int(val_string)
+        if val < min or val > max:
+            raise ValueError
+        return val
+    except ValueError:
+        print("Ignoring: Please use integer >= " + str(min) + " and <= " +
+              str(max) + ".")
+        return None
+
+
+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 build_fov_map(t):
+    """Build Thing's FOV map."""
+    t["fovmap"] = bytearray(b'v' * (world_db["MAP_LENGTH"] ** 2))
+    maptype = ctypes.c_char * len(world_db["MAP"])
+    test = libpr.build_fov_map(t["T_POSY"], t["T_POSX"],
+                               maptype.from_buffer(t["fovmap"]),
+                               maptype.from_buffer(world_db["MAP"]))
+    if test:
+        raise RuntimeError("Malloc error in build_fov_Map().")
+
+
+def decrement_lifepoints(t):
+    """Decrement t's lifepoints by 1, and if to zero, corpse it.
+
+    If t is the player avatar, only blank its fovmap, so that the client may
+    still display memory data. On non-player things, erase fovmap and memory.
+    """
+    t["T_LIFEPOINTS"] -= 1
+    if 0 == t["T_LIFEPOINTS"]:
+        t["T_TYPE"] = world_db["ThingTypes"][t["T_TYPE"]]["TT_CORPSE_ID"]
+        if world_db["Things"][0] == t:
+            t["fovmap"] = bytearray(b' ' * (world_db["MAP_LENGTH"] ** 2))
+            strong_write(io_db["file_out"], "LOG You die.\n")
+        else:
+            t["fovmap"] = False
+            t["T_MEMMAP"] = False
+            t["T_MEMDEPTHMAP"] = False
+            t["T_MEMTHING"] = []
+            strong_write(io_db["file_out"], "LOG It dies.\n")
+
+
+def mv_yx_in_dir_legal(dir, y, x):
+    """Wrapper around libpr.mv_yx_in_dir_legal to simplify its use."""
+    dir_c = dir.encode("ascii")[0]
+    test = libpr.mv_yx_in_dir_legal_wrap(dir_c, y, x)
+    if -1 == test:
+        raise RuntimeError("Too much wrapping in mv_yx_in_dir_legal_wrap()!")
+    return (test, libpr.result_y(), libpr.result_x())
+
+
+def actor_wait(t):
+    """Make t do nothing (but loudly, if player avatar)."""
+    if t == world_db["Things"][0]:
+        strong_write(io_db["file_out"], "LOG You wait.\n")
+
+
+def actor_move(t):
+    """If passable, move/collide(=attack) thing into T_ARGUMENT's direction."""
+    passable = False
+    move_result = mv_yx_in_dir_legal(chr(t["T_ARGUMENT"]),
+                                     t["T_POSY"], t["T_POSX"])
+    if 1 == move_result[0]:
+        pos = (move_result[1] * world_db["MAP_LENGTH"]) + move_result[2]
+        passable = "." == chr(world_db["MAP"][pos])
+        hitted = [id for id in world_db["Things"]
+                  if world_db["Things"][id] != t
+                  if world_db["Things"][id]["T_LIFEPOINTS"]
+                  if world_db["Things"][id]["T_POSY"] == move_result[1]
+                  if world_db["Things"][id]["T_POSX"] == move_result[2]]
+        if len(hitted):
+            hit_id = hitted[0]
+            hitter_name = world_db["ThingTypes"][t["T_TYPE"]]["TT_NAME"]
+            hitter = "You" if t == world_db["Things"][0] else hitter_name
+            hitted_type = world_db["Things"][hit_id]["T_TYPE"]
+            hitted_name = world_db["ThingTypes"][hitted_type]["TT_NAME"]
+            hitted = "you" if hit_id == 0 else hitted_name
+            verb = " wound " if hitter == "You" else " wounds "
+            strong_write(io_db["file_out"], "LOG " + hitter + verb + hitted +
+                                            ".\n")
+            decrement_lifepoints(world_db["Things"][hit_id])
+            return
+    dir = [dir for dir in directions_db
+           if directions_db[dir] == chr(t["T_ARGUMENT"])][0]
+    if passable:
+        t["T_POSY"] = move_result[1]
+        t["T_POSX"] = move_result[2]
+        for id in t["T_CARRIES"]:
+            world_db["Things"][id]["T_POSY"] = move_result[1]
+            world_db["Things"][id]["T_POSX"] = move_result[2]
+        build_fov_map(t)
+        strong_write(io_db["file_out"], "LOG You move " + dir + ".\n")
+    else:
+        strong_write(io_db["file_out"], "LOG You fail to move " + dir + ".\n")
+
+
+def actor_pick_up(t):
+    """Make t pick up (topmost?) Thing from ground into inventory."""
+    # Topmostness is actually not defined so far.
+    ids = [id for id in world_db["Things"] if world_db["Things"][id] != t
+           if not world_db["Things"][id]["carried"]
+           if world_db["Things"][id]["T_POSY"] == t["T_POSY"]
+           if world_db["Things"][id]["T_POSX"] == t["T_POSX"]]
+    if len(ids):
+        world_db["Things"][ids[0]]["carried"] = True
+        t["T_CARRIES"].append(ids[0])
+        if t == world_db["Things"][0]:
+            strong_write(io_db["file_out"], "LOG You pick up an object.\n")
+    elif t == world_db["Things"][0]:
+        err = "You try to pick up an object, but there is none."
+        strong_write(io_db["file_out"], "LOG " + err + "\n")
+
+
+def actor_drop(t):
+    """Make t rop Thing from inventory to ground indexed by T_ARGUMENT."""
+    # TODO: Handle case where T_ARGUMENT matches nothing.
+    if len(t["T_CARRIES"]):
+        id = t["T_CARRIES"][t["T_ARGUMENT"]]
+        t["T_CARRIES"].remove(id)
+        world_db["Things"][id]["carried"] = False
+        if t == world_db["Things"][0]:
+            strong_write(io_db["file_out"], "LOG You drop an object.\n")
+    elif t == world_db["Things"][0]:
+        err = "You try to drop an object, but you own none."
+        strong_write(io_db["file_out"], "LOG " + err + "\n")
+
+
+def actor_use(t):
+    """Make t use (for now: consume) T_ARGUMENT-indexed Thing in inventory."""
+    # TODO: Handle case where T_ARGUMENT matches nothing.
+    if len(t["T_CARRIES"]):
+        id = t["T_CARRIES"][t["T_ARGUMENT"]]
+        type = world_db["Things"][id]["T_TYPE"]
+        if world_db["ThingTypes"][type]["TT_CONSUMABLE"]:
+            t["T_CARRIES"].remove(id)
+            del world_db["Things"][id]
+            t["T_SATIATION"] += world_db["ThingTypes"][type]["TT_CONSUMABLE"]
+            t["T_LIFEPOINTS"] += 1
+            # Wrongly increment HPs is a replica of the original code.
+            strong_write(io_db["file_out"], "LOG You consume this object.\n")
+        else:
+            strong_write(io_db["file_out"], "LOG You try to use this object," +
+                                            "but fail.\n")
+    else:
+        strong_write(io_db["file_out"], "LOG You try to use an object, but " +
+                                        "you own none.\n")
+
+
+def thingproliferation(t):
+    """To chance of 1/TT_PROLIFERATE, create t offspring in neighbor cell.
+
+    Naturally only works with TT_PROLIFERATE > 0. The neighbor cell must be
+    passable and not be inhabited by a Thing of the same type, or, if Thing is
+    animate, any other animate Thing. If there are several map cell candidates,
+    one is selected randomly.
+    """
+    def test_cell(t, y, x):
+        if "." == chr(world_db["MAP"][(y * world_db["MAP_LENGTH"]) + x]):
+            for id in [id for id in world_db["Things"]
+                       if y == world_db["Things"][id]["T_POSY"]
+                       if x == world_db["Things"][id]["T_POSX"]
+                       if (t["T_TYPE"] == world_db["Things"][id]["T_TYPE"])
+                       or (t["T_LIFEPOINTS"] and
+                           world_db["Things"][id]["T_LIFEPOINTS"])]:
+                return False
+            return True
+        return False
+    prolscore = world_db["ThingTypes"][t["T_TYPE"]]["TT_PROLIFERATE"]
+    if prolscore and (1 == prolscore or 1 == (rand.next() % prolscore)):
+        candidates = []
+        for dir in [directions_db[key] for key in directions_db]:
+            mv_result = mv_yx_in_dir_legal(dir, t["T_POSY"], t["T_POSX"])
+            if mv_result[0] and test_cell(t, mv_result[1], mv_result[2]):
+                candidates.append((mv_result[1], mv_result[2]))
+        if len(candidates):
+            i = rand.next() % len(candidates)
+            id = id_setter(-1, "Things")
+            newT = new_Thing(t["T_TYPE"], (candidates[i][0], candidates[i][1]))
+            world_db["Things"][id] = newT
+
+
+def try_healing(t):
+    """Grow t's HP to a 1/32 chance if < HP max, satiation > 0, and waiting.
+
+    On success, decrease satiation score by 32.
+    """
+    if t["T_SATIATION"] > 0 \
+       and t["T_LIFEPOINTS"] < \
+           world_db["ThingTypes"][t["T_TYPE"]]["TT_LIFEPOINTS"] \
+       and 0 == (rand.next() % 31) \
+       and t["T_COMMAND"] == [id for id in world_db["ThingActions"]
+                              if world_db["ThingActions"][id]["TA_NAME"] ==
+                                 "wait"][0]:
+        t["T_LIFEPOINTS"] += 1
+        t["T_SATIATION"] -= 32
+        if t == world_db["Things"][0]:
+            strong_write(io_db["file_out"], "LOG You heal.\n")
+        else:
+            name = world_db["ThingTypes"][t["T_TYPE"]]["TT_NAME"]
+            strong_write(io_db["file_out"], "LOG " + name + "heals.\n")
+
+
+def hunger(t):
+    """Decrement t's satiation,dependent on it trigger lifepoint dec chance."""
+    if t["T_SATIATION"] > -32768:
+        t["T_SATIATION"] -= 1
+    testbase = t["T_SATIATION"] if t["T_SATIATION"] >= 0 else -t["T_SATIATION"]
+    if not world_db["ThingTypes"][t["T_TYPE"]]["TT_LIFEPOINTS"]:
+        raise RuntimeError("A thing that should not hunger is hungering.")
+    stomach = int(32767 / world_db["ThingTypes"][t["T_TYPE"]]["TT_LIFEPOINTS"])
+    if int(int(testbase / stomach) / ((rand.next() % stomach) + 1)):
+        if t == world_db["Things"][0]:
+            strong_write(io_db["file_out"], "LOG You suffer from hunger.\n")
+        else:
+            name = world_db["ThingTypes"][t["T_TYPE"]]["TT_NAME"]
+            strong_write(io_db["file_out"], "LOG " + name +
+                                            " suffers from hunger.\n")
+        decrement_lifepoints(t)
+
+
+def get_dir_to_nearest_target(t, c):
+    # Dummy
+    return False
+
+
+def standing_on_consumable(t):
+    """Return True/False whether t is standing on a consumable."""
+    for id in [id for id in world_db["Things"] if world_db["Things"][id] != t
+               if world_db["Things"][id]["T_POSY"] == t["T_POSY"]
+               if world_db["Things"][id]["T_POSX"] == t["T_POSX"]
+               if world_db["ThingTypes"][world_db["Things"][id]["T_TYPE"]]
+                          ["TT_CONSUMABLE"]]:
+        return True
+    return False
+
+
+def get_inventory_slot_to_consume(t):
+    """Return slot Id of strongest consumable in t's inventory, else -1."""
+    cmp_consumability = 0
+    selection = -1
+    i = 0
+    for id in t["T_CARRIES"]:
+        type = world_db["Things"][id]["T_TYPE"]
+        if world_db["ThingTypes"][type]["TT_CONSUMABLE"] > cmp_consumability:
+            cmp_consumability = world_db["ThingTypes"][type]["TT_CONSUMABLE"]
+            selection = i
+        i += 1
+    return selection
+
+
+def ai(t):
+    """Determine next command/argment for actor t via AI algorithms.
+
+    AI will look for, and move towards, enemies (animate Things not of their
+    own ThingType); if they see none, they will consume consumables in their
+    inventory; if there are none, they will pick up what they stand on if they
+    stand on consumables; if they stand on none, they will move towards the
+    next consumable they see or remember on the map; if they see or remember
+    none, they will explore parts of the map unseen since ever or for at least
+    one turn; if there is nothing to explore, they will simply wait.
+    """
+    t["T_COMMAND"] = [id for id in world_db["ThingActions"]
+                      if world_db["ThingActions"][id]["TA_NAME"] == "wait"][0]
+    if not get_dir_to_nearest_target(t, "f"):
+        sel = get_inventory_slot_to_consume(t)
+        if -1 != sel:
+            t["T_COMMAND"] = [id for id in world_db["ThingActions"]
+                              if world_db["ThingActions"][id]["TA_NAME"]
+                                 == "use"][0]
+            t["T_ARGUMENT"] = sel
+        elif standing_on_consumable(t):
+            t["T_COMMAND"] = [id for id in world_db["ThingActions"]
+                              if world_db["ThingActions"][id]["TA_NAME"]
+                                 == "pick_up"][0]
+        elif (not get_dir_to_nearest_target(t, "c")) and \
+             (not get_dir_to_nearest_target(t, "a")):
+            get_dir_to_nearest_target(t, "s")
+
+
+def turn_over():
+    """Run game world and its inhabitants until new player input expected."""
+    id = 0
+    whilebreaker = False
+    while world_db["Things"][0]["T_LIFEPOINTS"]:
+        for id in [id for id in world_db["Things"]]:
+            if not id in world_db["Things"]: # Thing may have been consumed
+                continue                     # during turn …
+            Thing = world_db["Things"][id]
+            if Thing["T_LIFEPOINTS"]:
+                if not Thing["T_COMMAND"]:
+                    update_map_memory(Thing)
+                    if 0 == id:
+                        whilebreaker = True
+                        break
+                    ai(Thing)
+                    Thing["T_COMMAND"] = 1
+                try_healing(Thing)
+                Thing["T_PROGRESS"] += 1
+                taid = [a for a in world_db["ThingActions"]
+                          if a == Thing["T_COMMAND"]][0]
+                ThingAction = world_db["ThingActions"][taid]
+                if Thing["T_PROGRESS"] == ThingAction["TA_EFFORT"]:
+                    eval("actor_" + ThingAction["TA_NAME"])(Thing)
+                    Thing["T_COMMAND"] = 0
+                    Thing["T_PROGRESS"] = 0
+                hunger(Thing)
+            thingproliferation(Thing)
+        if whilebreaker:
+            break
+        world_db["TURN"] += 1
+
+
+def new_Thing(type, pos=(0, 0)):
+    """Return Thing of type T_TYPE, with fovmap if alive and world active."""
+    thing = {
+        "T_LIFEPOINTS": world_db["ThingTypes"][type]["TT_LIFEPOINTS"],
+        "T_ARGUMENT": 0,
+        "T_PROGRESS": 0,
+        "T_SATIATION": 0,
+        "T_COMMAND": 0,
+        "T_TYPE": type,
+        "T_POSY": pos[0],
+        "T_POSX": pos[1],
+        "T_CARRIES": [],
+        "carried": False,
+        "T_MEMTHING": [],
+        "T_MEMMAP": False,
+        "T_MEMDEPTHMAP": False,
+        "fovmap": False
+    }
+    if world_db["WORLD_ACTIVE"] and thing["T_LIFEPOINTS"]:
+        build_fov_map(thing)
+    return thing
+
+
+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():
@@ -188,25 +910,499 @@ def command_quit():
     raise SystemExit("received QUIT command")
 
 
+def command_thingshere(str_y, str_x):
+    """Write to out file list of Things known to player at coordinate y, x."""
+    if world_db["WORLD_ACTIVE"]:
+        y = integer_test(str_y, 0, 255)
+        x = integer_test(str_x, 0, 255)
+        length = world_db["MAP_LENGTH"]
+        if None != y and None != x and y < length and x < length:
+            pos = (y * world_db["MAP_LENGTH"]) + x
+            strong_write(io_db["file_out"], "THINGS_HERE START\n")
+            if "v" == chr(world_db["Things"][0]["fovmap"][pos]):
+                for id in world_db["Things"]:
+                    # write_thing_if_here()
+                    if y == world_db["Things"][id]["T_POSY"] \
+                       and x == world_db["Things"][id]["T_POSX"] \
+                       and not world_db["Things"][id]["carried"]:
+                        type = world_db["Things"][id]["T_TYPE"]
+                        name = world_db["ThingTypes"][type]["TT_NAME"]
+                        strong_write(io_db["file_out"], name + "\n")
+            else:
+                for mt in world_db["Things"][0]["T_MEMTHING"]:
+                    if y == mt[1] and x == mt[2]:
+                        name = world_db["ThingTypes"][mt[0]]["TT_NAME"]
+                        strong_write(io_db["file_out"], name + "\n")
+            strong_write(io_db["file_out"], "THINGS_HERE END\n")
+        else:
+            print("Ignoring: Invalid map coordinates.")
+    else:
+        print("Ignoring: Command only works on existing worlds.")
+
+
+def play_commander(action, args=False):
+    """Setter for player's T_COMMAND and T_ARGUMENT, then calling turn_over().
+
+    T_ARGUMENT is set to direction char if action=="wait",or 8-bit int if args.
+    """
+
+    def set_command():
+        id = [x for x in world_db["ThingActions"]
+                if world_db["ThingActions"][x]["TA_NAME"] == action][0]
+        world_db["Things"][0]["T_COMMAND"] = id
+        turn_over()
+
+    def set_command_and_argument_int(str_arg):
+        val = integer_test(str_arg, 0, 255)
+        if None != val:
+            world_db["Things"][0]["T_ARGUMENT"] = val
+            set_command()
+
+    def set_command_and_argument_movestring(str_arg):
+        if str_arg in directions_db:
+            world_db["Things"][0]["T_ARGUMENT"] = ord(directions_db[str_arg])
+            set_command()
+        else:
+            print("Ignoring: Argument must be valid direction string.")
+
+    if action == "move":
+        return set_command_and_argument_movestring
+    elif args:
+        return set_command_and_argument_int
+    else:
+        return set_command
+
+
+def command_seedrandomness(seed_string):
+    """Set rand seed to int(seed_string)."""
+    val = integer_test(seed_string, 0, 4294967295)
+    if None != val:
+        rand.seed = val
+
+
+def command_seedmap(seed_string):
+    """Set world_db["SEED_MAP"] to int(seed_string), then (re-)make map."""
+    setter(None, "SEED_MAP", 0, 4294967295)(seed_string)
+    remake_map()
+
+
+def command_makeworld(seed_string):
+    """(Re-)build game world, i.e. map, things, to a new turn 1 from seed.
+
+    Seed rand with seed, fill it into world_db["SEED_MAP"]. Do more only with a
+    "wait" ThingAction and world["PLAYER_TYPE"] matching ThingType of
+    TT_START_NUMBER > 0. Then, world_db["Things"] emptied, call remake_map()
+    and set world_db["WORLD_ACTIVE"], world_db["TURN"] to 1. Build new Things
+    according to ThingTypes' TT_START_NUMBERS, with Thing of ID 0 to ThingType
+    of ID = world["PLAYER_TYPE"]. Place Things randomly, and actors not on each
+    other. Init player's memory map. Write "NEW_WORLD" line to out file.
+    """
+
+    def free_pos():
+        i = 0
+        while 1:
+            err = "Space to put thing on too hard to find. Map too small?"
+            while 1:
+                y = rand.next() % world_db["MAP_LENGTH"]
+                x = rand.next() % world_db["MAP_LENGTH"]
+                if "." == chr(world_db["MAP"][y * world_db["MAP_LENGTH"] + x]):
+                    break
+                i += 1
+                if i == 65535:
+                    raise SystemExit(err)
+            # Replica of C code, wrongly ignores animatedness of new Thing.
+            pos_clear = (0 == len([id for id in world_db["Things"]
+                                   if world_db["Things"][id]["T_LIFEPOINTS"]
+                                   if world_db["Things"][id]["T_POSY"] == y
+                                   if world_db["Things"][id]["T_POSX"] == x]))
+            if pos_clear:
+                break
+        return (y, x)
+
+    val = integer_test(seed_string, 0, 4294967295)
+    if None == val:
+        return
+    rand.seed = val
+    world_db["SEED_MAP"] = val
+    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
+    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"]):
+        id = id_setter(-1, "Things")
+        world_db["Things"][id] = new_Thing(playertype, free_pos())
+    update_map_memory(world_db["Things"][0])
+    for type in world_db["ThingTypes"]:
+        for i in range(world_db["ThingTypes"][type]["TT_START_NUMBER"]):
+            if type != playertype:
+                id = id_setter(-1, "Things")
+                world_db["Things"][id] = new_Thing(type, free_pos())
+    strong_write(io_db["file_out"], "NEW_WORLD\n")
+
+
+def command_maplength(maplength_string):
+    """Redefine map length. Invalidate map, therefore lose all things on it."""
+    val = integer_test(maplength_string, 1, 256)
+    if None != val:
+        world_db["MAP_LENGTH"] = val
+        set_world_inactive()
+        world_db["Things"] = {}
+        libpr.set_maplength(val)
+
+
+def command_worldactive(worldactive_string):
+    """Toggle world_db["WORLD_ACTIVE"] if possible.
+
+    An active world can always be set inactive. An inactive world can only be
+    set active with a "wait" ThingAction, and a player Thing (of ID 0). On
+    activation, rebuild all Things' FOVs, and the player's map memory.
+    """
+    # In original version, map existence was also tested (unnecessarily?).
+    val = integer_test(worldactive_string, 0, 1)
+    if val:
+        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
+            for Thing in world_db["Things"]:
+                if 0 == Thing:
+                    player_exists = True
+                    break
+            if wait_exists and player_exists:
+                for id in world_db["Things"]:
+                    if world_db["Things"][id]["T_LIFEPOINTS"]:
+                        build_fov_map(world_db["Things"][id])
+                        if 0 == id:
+                            update_map_memory(world_db["Things"][id])
+                world_db["WORLD_ACTIVE"] = 1
+
+
+def test_for_id_maker(object, category):
+    """Return decorator testing for object having "id" attribute."""
+    def decorator(f):
+        def helper(*args):
+            if hasattr(object, "id"):
+                f(*args)
+            else:
+                print("Ignoring: No " + category +
+                      " defined to manipulate yet.")
+        return helper
+    return decorator
+
+
+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
+        type = list(world_db["ThingTypes"].keys())[0]
+        world_db["Things"][id] = new_Thing(type)
+
+
+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.
+
+    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:
+            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"]
+                map = None
+                if not world_db["Things"][command_tid.id][maptype]:
+                    map = bytearray(b' ' * (length ** 2))
+                else:
+                    map = world_db["Things"][command_tid.id][maptype]
+                map[val * length:(val * length) + length] = mapline.encode()
+                world_db["Things"][command_tid.id][maptype] = map
+    return helper
+
+
+def setter_tpos(axis):
+    """Generate setter for T_POSX or  T_POSY of selected Thing.
+
+    If world is active, rebuilds animate things' fovmap, player's memory map.
+    """
+    @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
+                if world_db["WORLD_ACTIVE"] \
+                   and world_db["Things"][command_tid.id]["T_LIFEPOINTS"]:
+                    build_fov_map(world_db["Things"][command_tid.id])
+                    if 0 == command_tid.id:
+                        update_map_memory(world_db["Things"][command_tid.id])
+            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 TT_NAME of selected ThingType."""
+    world_db["ThingTypes"][command_ttid.id]["TT_NAME"] = name
+
+
+@test_ThingType_id
+def command_ttsymbol(char):
+    """Set TT_SYMBOL of selected ThingType. """
+    if 1 == len(char):
+        world_db["ThingTypes"][command_ttid.id]["TT_SYMBOL"] = char
+    else:
+        print("Ignoring: Argument must be single character.")
+
+
+@test_ThingType_id
+def command_ttcorpseid(str_int):
+    """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("Ignoring: Corpse ID belongs to no known ThignType.")
+
+
+def command_taid(id_string):
+    """Set ID of ThingAction to manipulate. ID unused? Create new one.
+
+    Default new ThingAction's TA_EFFORT to 1, its TA_NAME to "wait".
+    """
+    id = id_setter(id_string, "ThingActions", command_taid, True)
+    if None != id:
+        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_taname(name):
+    """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().
+    """
+    if name == "wait" or name == "move" or name == "use" or name == "drop" \
+       or name == "pick_up":
+        world_db["ThingActions"][command_taid.id]["TA_NAME"] = name
+        if 1 == world_db["WORLD_ACTIVE"]:
+            wait_defined = False
+            for id in world_db["ThingActions"]:
+                if "wait" == world_db["ThingActions"][id]["TA_NAME"]:
+                    wait_defined = True
+                    break
+            if not wait_defined:
+                set_world_inactive()
+    else:
+        print("Ignoring: Invalid action name.")
+    # In contrast to the original,naming won't map a function to a ThingAction.
+
+
+def command_ai():
+    """Call ai() on player Thing, then turn_over()."""
+    ai(world_db["Things"][0])
+    turn_over()
+
+
 """Commands database.
 
-Map command start tokens to ([0]) minimum number of expected command arguments,
-([1]) the command's meta-ness (i.e. is it to be written to the record file, is
-it to be ignored in replay mode if read from server input file), and ([2]) a
-function to be called on it.
+Map command start tokens to ([0]) number of expected command arguments, ([1])
+the command's meta-ness (i.e. is it to be written to the record file, is it to
+be ignored in replay mode if read from server input file), and ([2]) a function
+to be called on it.
 """
 commands_db = {
     "QUIT": (0, True, command_quit),
     "PING": (0, True, command_ping),
-    "MAKE_WORLD": (1, False, command_makeworld)
+    "THINGS_HERE": (2, True, command_thingshere),
+    "MAKE_WORLD": (1, False, command_makeworld),
+    "SEED_MAP": (1, False, command_seedmap),
+    "SEED_RANDOMNESS": (1, False, command_seedrandomness),
+    "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, 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, 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")),
+    "wait": (0, False, play_commander("wait")),
+    "move": (1, False, play_commander("move")),
+    "pick_up": (0, False, play_commander("pick_up")),
+    "drop": (1, False, play_commander("drop", True)),
+    "use": (1, False, play_commander("use", True)),
+    "ai": (0, False, command_ai)
 }
 
 
-"""World state database,"""
+"""World state database. With sane default values. (Randomness is in rand.)"""
 world_db = {
-    "turn": 0
+    "TURN": 0,
+    "MAP_LENGTH": 64,
+    "SEED_MAP": 0,
+    "PLAYER_TYPE": 0,
+    "WORLD_ACTIVE": 0,
+    "ThingActions": {},
+    "ThingTypes": {},
+    "Things": {}
 }
 
+"""Mapping of direction names to internal direction chars."""
+directions_db = {"east": "d", "south-east": "c", "south-west": "x",
+                 "west": "s", "north-west": "w", "north-east": "e"}
 
 """File IO database."""
 io_db = {
@@ -218,46 +1414,20 @@ io_db = {
     "path_out": "server/out",
     "path_worldstate": "server/worldstate",
     "tmp_suffix": "_tmp",
-    "kicked_by_rival": False
+    "kicked_by_rival": False,
+    "worldstate_updateable": False
 }
 
 
 try:
+    libpr = prep_library()
+    rand = RandomnessIO()
     opts = parse_command_line_arguments()
     setup_server_io()
-    # print("DUMMY: Run game.")
     if None != opts.replay:
-        if opts.replay < 1:
-            opts.replay = 1
-        print("Replay mode. Auto-replaying up to turn " + str(opts.replay) +
-              " (if so late a turn is to be found).")
-        if not os.access(io_db["path_record"], os.F_OK):
-            raise SystemExit("No record file found to replay.")
-        io_db["file_record"] = open(io_db["path_record"], "r")
-        io_db["file_record"].prefix = "recod file line "
-        io_db["file_record"].line_n = 1
-        while world_db["turn"] < opts.replay:
-            line = io_db["file_record"].readline()
-            if "" == line:
-                break
-            obey(line.rstrip(), io_db["file_record"].prefix
-                 + str(io_db["file_record"].line_n))
-            io_db["file_record"].line_n = io_db["file_record"].line_n + 1
-        while True:
-            obey(read_command(), "in file", replay=True)
+        replay_game()
     else:
-        if os.access(io_db["path_save"], os.F_OK):
-            obey_lines_in_file(io_db["path_save"], "save")
-        else:
-            if not os.access(io_db["path_worldconf"], os.F_OK):
-                msg = "No world config file from which to start a new world."
-                raise SystemExit(msg)
-            obey_lines_in_file(io_db["path_worldconf"], "world config ",
-                               do_record=True)
-            obey("MAKE_WORLD " + str(int(time.time())), "in file",
-                 do_record=True)
-        while True:
-            obey(read_command(), "in file", do_record=True)
+        play_game()
 except SystemExit as exit:
     print("ABORTING: " + exit.args[0])
 except:
@@ -265,4 +1435,3 @@ except:
     raise
 finally:
     cleanup_server_io()
-    # print("DUMMY: (Clean up C heap.)")