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Server/py: Use -O3 for libplomrogue.
[plomrogue] / plomrogue-server.py
index 5028e609b905cf0fc58a93fad9dfdc5b2a19cd70..77c19acd498326b49f9796c43b7a7b9ad7fc215e 100755 (executable)
@@ -1,9 +1,66 @@
+#!/usr/bin/python3
 import argparse
 import errno
 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-server.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
+    libpr.init_score_map.restype = ctypes.c_uint8
+    libpr.set_map_score.argtypes = [ctypes.c_uint16, ctypes.c_uint16]
+    libpr.set_map_score.restype = ctypes.c_uint8
+    libpr.get_map_score.argtypes = [ctypes.c_uint16]
+    libpr.get_map_score.restype = ctypes.c_int32
+    libpr.get_neighbor_score.argtypes = [ctypes.c_uint8]
+    libpr.get_neighbor_score.restype = ctypes.c_uint16
+    libpr.ready_neighbor_scores.argtpes = [ctypes.c_uint16]
+    libpr.ready_neighbor_scores.restype = ctypes.c_uint8
+    libpr.dijkstra_map.restype = ctypes.c_uint8
+    return libpr
+
+
+def strong_write(file, string):
+    """Apply write(string), then flush()."""
+    file.write(string)
+    file.flush()
 
 
 def setup_server_io():
@@ -23,10 +80,12 @@ def setup_server_io():
         if os.access(path_tmp, os.F_OK):
             raise SystemExit(msg)
     io_db["teststring"] = str(os.getpid()) + " " + str(time.time())
+    io_db["save_wait"] = 0
+    io_db["verbose"] = False
+    io_db["record_chunk"] = ""
     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")
@@ -41,11 +100,11 @@ def cleanup_server_io():
     def helper(file_key, path_key):
         if file_key in io_db:
             io_db[file_key].close()
-            if not io_db["kicked_by_rival"] \
-               and os.access(io_db[path_key], os.F_OK):
-                os.remove(io_db[path_key])
-    helper("file_out", "path_out")
+        if not io_db["kicked_by_rival"] \
+           and os.access(io_db[path_key], os.F_OK):
+            os.remove(io_db[path_key])
     helper("file_in", "path_in")
+    helper("file_out", "path_out")
     helper("file_worldstate", "path_worldstate")
     if "file_record" in io_db:
         io_db["file_record"].close()
@@ -54,15 +113,19 @@ 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.
-    The prefix string is inserted into the server's input message between its
-    beginning 'input ' & ':'. All activity is preceded by a server_test() call.
+    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 to io_db["record_chunk"], and save_world()
+    is called (and io_db["record_chunk"] written) if 15 seconds have passed
+    since the last time it was called. The prefix string is inserted into the
+    server's input message between its beginning 'input ' and ':'. All activity
+    is preceded by a server_test() call.
     """
     server_test()
-    print("input " + prefix + ": " + command)
+    if io_db["verbose"]:
+        print("input " + prefix + ": " + command)
     try:
         tokens = shlex.split(command, comments=True)
     except ValueError as err:
@@ -71,7 +134,7 @@ 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()
@@ -84,9 +147,15 @@ def obey(command, prefix, replay=False, do_record=False):
         else:
             commands_db[tokens[0]][2](*tokens[1:])
             if do_record:
-                record(command)
-                save_world()
-    else:
+                io_db["record_chunk"] += command + "\n"
+                if time.time() > io_db["save_wait"] + 15:
+                    atomic_write(io_db["path_record"], io_db["record_chunk"],
+                                 do_append=True)
+                    save_world()
+                    io_db["record_chunk"] = ""
+                    io_db["save_wait"] = time.time()
+            io_db["worldstate_updateable"] = world_db["WORLD_ACTIVE"]
+    elif 0 != len(tokens):
         print("Invalid command/argument, or bad number of tokens.")
 
 
@@ -99,41 +168,77 @@ 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)
     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.
-    atomic_write(io_db["path_record"], command + "\n", do_append=True)
-
-
 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"
-    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)
-    # 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.
+    """Save all commands needed to reconstruct current world state."""
+
+    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):
@@ -152,6 +257,9 @@ def parse_command_line_arguments():
     parser = argparse.ArgumentParser()
     parser.add_argument('-s', nargs='?', type=int, dest='replay', const=1,
                         action='store')
+    parser.add_argument('-l', nargs="?", const="save", dest='savefile',
+                        action="store")
+    parser.add_argument('-v', dest='verbose', action='store_true')
     opts, unknown = parser.parse_known_args()
     return opts
 
@@ -182,7 +290,7 @@ 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 = ""
@@ -201,12 +309,74 @@ def read_command():
     return command
 
 
+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
@@ -225,6 +395,7 @@ 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)
 
 
@@ -233,7 +404,8 @@ 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")
@@ -245,12 +417,98 @@ 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.")
+    """(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, age_map=True):
+    """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 age_map and 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 [id for id in world_db["Things"]
+               if not world_db["Things"][id]["carried"]]:
+        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():
@@ -262,7 +520,7 @@ def set_world_inactive():
 
 
 def integer_test(val_string, min, max):
-    """Return val_string if possible integer >= min and <= max, else False."""
+    """Return val_string if possible integer >= min and <= max, else None."""
     try:
         val = int(val_string)
         if val < min or val > max:
@@ -271,106 +529,1004 @@ def integer_test(val_string, min, max):
     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)
+        if t == world_db["Things"][0]:
+            strong_write(io_db["file_out"], "LOG You move " + dir + ".\n")
+    elif t == world_db["Things"][0]:
+        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. Picks Thing with highest ID.
+    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):
+        highest_id = 0
+        for id in ids:
+            if id > highest_id:
+                highest_id = id
+        world_db["Things"][highest_id]["carried"] = True
+        t["T_CARRIES"].append(highest_id)
+        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"]
+            if t == world_db["Things"][0]:
+                strong_write(io_db["file_out"],
+                             "LOG You consume this object.\n")
+        elif t == world_db["Things"][0]:
+            strong_write(io_db["file_out"],
+                         "LOG You try to use this object, but fail.\n")
+    elif t == world_db["Things"][0]:
+        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_target(t, filter):
+    """Try to set T_COMMAND/T_ARGUMENT for move to "filter"-determined target.
+
+    The path-wise nearest target is chosen, via the shortest available path.
+    Target must not be t. On succcess, return positive value, else False.
+    Filters:
+    "a": Thing in FOV is below a certain distance, animate, but of ThingType
+         that is not t's, and starts out weaker than t is; build path as
+         avoiding things of t's ThingType
+    "f": neighbor cell (not inhabited by any animate Thing) further away from
+         animate Thing not further than x steps away and in FOV and of a
+         ThingType that is not t's, and starts out stronger or as strong as t
+         is currently; or (cornered), if no such flight cell, but Thing of
+         above criteria is too near,1 a cell closer to it, or, if less near,
+         just wait
+    "c": Thing in memorized map is consumable
+    "s": memory map cell with greatest-reachable degree of unexploredness
+    """
 
+    def set_map_score(pos, score):
+        test = libpr.set_map_score(pos, score)
+        if test:
+            raise RuntimeError("No score map allocated for set_map_score().")
+
+    def get_map_score(pos):
+        result = libpr.get_map_score(pos)
+        if result < 0:
+            raise RuntimeError("No score map allocated for get_map_score().")
+        return result
+
+    def seeing_thing():
+        if t["fovmap"] and ("a" == filter or "f" == filter):
+            for id in world_db["Things"]:
+                Thing = world_db["Things"][id]
+                if Thing != t and Thing["T_LIFEPOINTS"] and \
+                   t["T_TYPE"] != Thing["T_TYPE"] and \
+                   'v' == chr(t["fovmap"][(Thing["T_POSY"]
+                                          * world_db["MAP_LENGTH"])
+                                          + Thing["T_POSX"]]):
+                    ThingType = world_db["ThingTypes"][Thing["T_TYPE"]]
+                    if ("f" == filter and ThingType["TT_LIFEPOINTS"] >=
+                                          t["T_LIFEPOINTS"]) \
+                       or ("a" == filter and ThingType["TT_LIFEPOINTS"] <
+                                             t["T_LIFEPOINTS"]):
+                        return True
+        elif t["T_MEMMAP"] and "c" == filter:
+            for mt in t["T_MEMTHING"]:
+                if ' ' != chr(t["T_MEMMAP"][(mt[1] * world_db["MAP_LENGTH"])
+                                         + mt[2]]) \
+                   and world_db["ThingTypes"][mt[0]]["TT_CONSUMABLE"]:
+                    return True
+        return False
 
-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 init_score_map():
+        test = libpr.init_score_map()
+        if test:
+            raise RuntimeError("Malloc error in init_score_map().")
+        for i in [i for i in range(world_db["MAP_LENGTH"] ** 2)
+                  if '.' == chr(t["T_MEMMAP"][i])]:
+            set_map_score(i, 65535 - 1)
+        if "a" == filter:
+            for id in world_db["Things"]:
+                Thing = world_db["Things"][id]
+                pos = Thing["T_POSY"] * world_db["MAP_LENGTH"] \
+                      + Thing["T_POSX"]
+                if t != Thing and Thing["T_LIFEPOINTS"] and \
+                   t["T_TYPE"] != Thing["T_TYPE"] and \
+                   'v' == chr(t["fovmap"][pos]) and \
+                   t["T_LIFEPOINTS"] > \
+                   world_db["ThingTypes"][Thing["T_TYPE"]]["TT_LIFEPOINTS"]:
+                    set_map_score(pos, 0)
+                elif t["T_TYPE"] == Thing["T_TYPE"]:
+                    set_map_score(pos, 65535)
+        elif "f" == filter:
+            for id in [id for id in world_db["Things"]
+                       if world_db["Things"][id]["T_LIFEPOINTS"]]:
+                Thing = world_db["Things"][id]
+                pos = Thing["T_POSY"] * world_db["MAP_LENGTH"] \
+                      + Thing["T_POSX"]
+                if t["T_TYPE"] != Thing["T_TYPE"] and \
+                   'v' == chr(t["fovmap"][pos]) and \
+                   t["T_LIFEPOINTS"] <= \
+                   world_db["ThingTypes"][Thing["T_TYPE"]]["TT_LIFEPOINTS"]:
+                    set_map_score(pos, 0)
+        elif "c" == filter:
+            for mt in [mt for mt in t["T_MEMTHING"]
+                       if ' ' != chr(t["T_MEMMAP"][mt[1]
+                                                   * world_db["MAP_LENGTH"]
+                                                   + mt[2]])
+                       if world_db["ThingTypes"][mt[0]]["TT_CONSUMABLE"]]:
+                set_map_score(mt[1] * world_db["MAP_LENGTH"] + mt[2], 0)
+        elif "s" == filter:
+            for i in [i for i in range(world_db["MAP_LENGTH"] ** 2)
+                      if t["T_MEMDEPTHMAP"][i] == mem_depth_c[0]]:
+                set_map_score(i, 0)
+
+    def rand_target_dir(neighbors, cmp, dirs):
+        candidates = []
+        n_candidates = 0
+        for i in range(len(dirs)):
+            if cmp == neighbors[i]:
+                candidates.append(dirs[i])
+                n_candidates += 1
+        return candidates[rand.next() % n_candidates] if n_candidates else 0
+
+    def get_neighbor_scores(dirs, eye_pos):
+        scores = []
+        if libpr.ready_neighbor_scores(eye_pos):
+            raise RuntimeError("No score map allocated for " +
+                               "ready_neighbor_scores.()")
+        for i in range(len(dirs)):
+            scores.append(libpr.get_neighbor_score(i))
+        return scores
+
+    def get_dir_from_neighbors():
+        dir_to_target = False
+        dirs = "edcxsw"
+        eye_pos = t["T_POSY"] * world_db["MAP_LENGTH"] + t["T_POSX"]
+        neighbors = get_neighbor_scores(dirs, eye_pos)
+        if "f" == filter:
+            inhabited = [world_db["Things"][id]["T_POSY"]
+                         * world_db["MAP_LENGTH"]
+                         + world_db["Things"][id]["T_POSX"]
+                         for id in world_db["Things"]
+                         if world_db["Things"][id]["T_LIFEPOINTS"]]
+            for i in range(len(dirs)):
+                mv_yx_in_dir_legal(dirs[i], t["T_POSY"], t["T_POSX"])
+                pos_cmp = libpr.result_y() * world_db["MAP_LENGTH"] \
+                          + libpr.result_x()
+                for pos in [pos for pos in inhabited if pos == pos_cmp]:
+                    neighbors[i] = 65535
+                    break
+        minmax_start = 0 if "f" == filter else 65535 - 1
+        minmax_neighbor = minmax_start
+        for i in range(len(dirs)):
+            if ("f" == filter and get_map_score(eye_pos) < neighbors[i] and
+                minmax_neighbor < neighbors[i] and 65535 != neighbors[i]) \
+               or ("f" != filter and minmax_neighbor > neighbors[i]):
+                minmax_neighbor = neighbors[i]
+        if minmax_neighbor != minmax_start:
+            dir_to_target = rand_target_dir(neighbors, minmax_neighbor, dirs)
+        if "f" == filter:
+            if not dir_to_target:
+                if 1 == get_map_score(eye_pos):
+                    dir_to_target = rand_target_dir(neighbors, 0, dirs)
+                elif 3 >= get_map_score(eye_pos):
+                    t["T_COMMAND"] = [id for id in world_db["ThingActions"]
+                                      if
+                                      world_db["ThingActions"][id]["TA_NAME"]
+                                         == "wait"][0]
+                    return 1
+            elif dir_to_target and 3 < get_map_score(eye_pos):
+                dir_to_target = 0
+        elif "a" == filter and 10 <= get_map_score(eye_pos):
+            dir_to_target = 0
+        return dir_to_target
+
+    dir_to_target = False
+    mem_depth_c = b' '
+    run_i = 9 + 1 if "s" == filter else 1
+    while run_i and not dir_to_target and ("s" == filter or seeing_thing()):
+        run_i -= 1
+        init_score_map()
+        mem_depth_c = b'9' if b' ' == mem_depth_c \
+                           else bytes([mem_depth_c[0] - 1])
+        if libpr.dijkstra_map():
+            raise RuntimeError("No score map allocated for dijkstra_map().")
+        dir_to_target = get_dir_from_neighbors()
+        libpr.free_score_map()
+        if dir_to_target and str == type(dir_to_target):
+            t["T_COMMAND"] = [id for id in world_db["ThingActions"]
+                              if world_db["ThingActions"][id]["TA_NAME"]
+                                 == "move"][0]
+            t["T_ARGUMENT"] = ord(dir_to_target)
+    return dir_to_target
+
+
+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_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_target(t, "c")) and \
+             (not get_dir_to_target(t, "a")):
+            get_dir_to_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"]]:  # Only what's from start!
+            if not id in world_db["Things"] or \
+               world_db["Things"][id]["carried"]:   # May have been consumed or
+                continue                            # picked up 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)
+                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():
     """Abort server process."""
+    save_world()
+    atomic_write(io_db["path_record"], io_db["record_chunk"], do_append=True)
     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"]:
+                    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."""
-    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?
+    """(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):
-    # DUMMY.
-    set_world_inactive()
-    # TODO: remove things, map
-    worlddb_value_setter("MAP_LENGTH", 1, 256)(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):
-    # DUMMY.
+    """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"] 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?
-            if wait_exists and player_exists and map_exists:
-                # TODO: rebuild al things' FOVs, map memories
+            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], False)
                 world_db["WORLD_ACTIVE"] = 1
 
 
-def command_taid(id_string):
-    """Set ID of ThingAction to manipulate. ID unused? Create new ThingAction.
+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.
 
-    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. A new ThingAction's
-    "TA_EFFORT" defaults to 1, its "TA_NAME" to "wait".
+    Default new Thing's type to the first available ThingType, others: zero.
     """
-    id = integer_test(id_string, 0, 255)
-    if id:
-        if id in world_db["ThingActions"]:
-            command_taid.id = id
+    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:
-            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
-            world_db["ThingActions"][id] = {
-                "TA_EFFORT": 1,
-                "TA_NAME": "wait"
-            }
-            command_taid.id = id
+            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.
 
-def command_taeffort(str_int):
-    """Set to int(str_int) effort value of ThingAction of command_taid.id."""
-    if hasattr(command_taid, "id"):
+    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 val:
-            world_db["ThingActions"][command_taid.id]["TA_EFFORT"] = val
+        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("No thing action defined to manipulate yet.")
+        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.
@@ -383,51 +1539,91 @@ 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, 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, 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, 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. With sane default values."""
+"""World state database. With sane default values. (Randomness is in rand.)"""
 world_db = {
-    "TURN": 1,
+    "TURN": 0,
+    "MAP_LENGTH": 64,
     "SEED_MAP": 0,
-    "SEED_RANDOMNESS": 0,
     "PLAYER_TYPE": 0,
-    "MAP_LENGTH": 64,
     "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 = {
     "path_save": "save",
-    "path_record": "record",
+    "path_record": "record_save",
     "path_worldconf": "confserver/world",
     "path_server": "server/",
     "path_in": "server/in",
     "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()
+    if opts.savefile:
+        io_db["path_save"] = opts.savefile
+        io_db["path_record"] = "record_" + opts.savefile
     setup_server_io()
-    # print("DUMMY: Run game.")
+    if opts.verbose:
+        io_db["verbose"] = True
     if None != opts.replay:
         replay_game()
     else:
@@ -439,4 +1635,3 @@ except:
     raise
 finally:
     cleanup_server_io()
-    # print("DUMMY: (Clean up C heap.)")