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[plomrogue] / roguelike-server

#!/usr/bin/python3

# This file is part of PlomRogue. PlomRogue is licensed under the GPL version 3
# or any later version. For details on its copyright, license, and warranties,
# see the file NOTICE in the root directory of the PlomRogue source package.


import argparse
import errno
import os
import shlex
import shutil
import time
import ctypes
import math  # #


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 ./redo first?")
    libpr = ctypes.cdll.LoadLibrary(libpath)
    libpr.seed_rrand.restype = ctypes.c_uint32
    return libpr


def c_pointer_to_bytearray(ba):
    """Return C char * pointer to ba."""
    type = ctypes.c_char * len(ba)
    return type.from_buffer(ba)


def strong_write(file, string):
    """Apply write(string), then flush()."""
    file.write(string)
    file.flush()


def setup_server_io():
    """Fill IO files DB with proper file( path)s. Write process IO test string.

    Ensure IO files directory at server/. Remove any old input file if found.
    Set up new input file for reading, and new output file for writing. Start
    output file with process hash line of format PID + " " + floated UNIX time
    (io_db["teststring"]). Raise SystemExit if file is found at path of either
    record or save file plus io_db["tmp_suffix"].
    """
    def detect_atomic_leftover(path, tmp_suffix):
        path_tmp = path + tmp_suffix
        msg = "Found file '" + path_tmp + "' that may be a leftover from an " \
              "aborted previous attempt to write '" + path + "'. Aborting " \
             "until matter is resolved by removing it from its current path."
        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")
    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")
    io_db["file_in"].close()
    io_db["file_in"] = open(io_db["path_in"], "r")
    detect_atomic_leftover(io_db["path_save"], io_db["tmp_suffix"])
    detect_atomic_leftover(io_db["path_record"], io_db["tmp_suffix"])


def cleanup_server_io():
    """Close and (if io_db["kicked_by_rival"] false) remove files in io_db."""
    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_in", "path_in")
    helper("file_out", "path_out")
    helper("file_worldstate", "path_worldstate")
    if "file_record" in io_db:
        io_db["file_record"].close()


def obey(command, prefix, replay=False, do_record=False):
    """Call function from commands_db mapped to command's first token.

    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. Commands that start with a lowercase
    letter are ignored when world_db["WORLD_ACTIVE"] is False/0.
    """
    server_test()
    if io_db["verbose"]:
        print("input " + prefix + ": " + command)
    try:
        tokens = shlex.split(command, comments=True)
    except ValueError as err:
        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:
        if commands_db[tokens[0]][1]:
            commands_db[tokens[0]][2](*tokens[1:])
        elif tokens[0][0].islower() and not world_db["WORLD_ACTIVE"]:
            print("Ignoring lowercase-starting commands when world inactive.")
        elif replay:
            print("Due to replay mode, reading command as 'go on in record'.")
            line = io_db["file_record"].readline()
            if len(line) > 0:
                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
            else:
                print("Reached end of record file.")
        else:
            commands_db[tokens[0]][2](*tokens[1:])
            if do_record:
                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)
                    if world_db["WORLD_ACTIVE"]:
                        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.")


def atomic_write(path, text, do_append=False, delete=True):
    """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 delete and os.access(path, os.F_OK):
        os.remove(path)
    os.rename(path_tmp, path)


def save_world():
    """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=None):
            string = ""
            if key == "MAP" or world_db["Things"][id][key]:
                map = world_db["MAP"] if key == "MAP" \
                                      else 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 != "altar"  # #
            and key != "MAP" and key != "WORLD_ACTIVE"):
            string = string + key + " " + str(world_db[key]) + "\n"
    string = string + mapsetter("MAP")()
    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):
    """Call obey() on each line of path's file, use name in input prefix."""
    file = open(path, "r")
    line_n = 1
    for line in file.readlines():
        obey(line.rstrip(), name + "file line " + str(line_n),
             do_record=do_record)
        line_n = line_n + 1
    file.close()


def parse_command_line_arguments():
    """Return settings values read from 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


def server_test():
    """Ensure valid server out file belonging to current process.

    This is done by comparing io_db["teststring"] to what's found at the start
    of the current file at io_db["path_out"]. On failure, set
    io_db["kicked_by_rival"] and raise SystemExit.
    """
    if not os.access(io_db["path_out"], os.F_OK):
        raise SystemExit("Server output file has disappeared.")
    file = open(io_db["path_out"], "r")
    test = file.readline().rstrip("\n")
    file.close()
    if test != io_db["teststring"]:
        io_db["kicked_by_rival"] = True
        msg = "Server test string in server output file does not match. This" \
              " indicates that the current server process has been " \
              "superseded by another one."
        raise SystemExit(msg)


def read_command():
    """Return next newline-delimited command from server in file.

    Keep building return string until a newline is encountered. Pause between
    unsuccessful reads, and after too much waiting, run server_test().
    """
    wait_on_fail = 0.03333
    max_wait = 5
    now = time.time()
    command = ""
    while True:
        add = io_db["file_in"].readline()
        if len(add) > 0:
            command = command + add
            if len(command) > 0 and "\n" == command[-1]:
                command = command[:-1]
                break
        else:
            time.sleep(wait_on_fail)
            if now + max_wait < time.time():
                server_test()
                now = time.time()
    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_TOOL"] == "food"
                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"
        # 7DRL additions:  GOD_MOOD, GOD_FAVOR
        string = str(world_db["TURN"]) + "\n" + \
                 str(world_db["GOD_MOOD"]) + "\n" + \
                 str(world_db["GOD_FAVOR"]) + "\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_TOOL"] == "food"
                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, delete=False)
        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 make_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).
    """
    # 7DRL: Also add some ":" cells, and (not surrounded by trees!) "_" altar.

    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

    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
    # This all-too-precise replica of the original C code misses iter_limit().
    n_colons = int((length ** 2) / 16)  # #
    i_colons = 0  # #
    while (i_colons <= n_colons):  # #
        single_allowed = rand.next() % 256  # #
        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), ":"))):  # #
            world_db["MAP"][pos] = ord(":")  # #
            i_colons += 1  # #
    altar_placed = False  # #
    while not altar_placed:  # #
        y = rand.next() % length  # #
        x = rand.next() % length  # #
        pos = (y * length) + x  # #
        if (("." == chr(world_db["MAP"][pos]  # #
             or ":" == chr(world_db["MAP"][pos]))
            and not is_neighbor((y, x), "X"))):  # #
            world_db["MAP"][pos] = ord("_")  # #
            world_db["altar"] = (y, x)  # #
            altar_placed = True  # #


def update_map_memory(t, age_map=True):
    """Update t's T_MEMMAP with what's in its FOV now,age its T_MEMMEPTHMAP."""

    def age_some_memdepthmap_on_nonfov_cells():
        # OUTSOURCED FOR PERFORMANCE REASONS TO libplomrogue.so:
        # ord_v = ord("v")
        # ord_0 = ord("0")
        # ord_9 = ord("9")
        # for pos in [pos for pos in range(world_db["MAP_LENGTH"] ** 2)
        #             if not ord_v == t["fovmap"][pos]
        #             if ord_0 <= t["T_MEMDEPTHMAP"][pos]
        #             if ord_9 > t["T_MEMDEPTHMAP"][pos]
        #             if not rand.next() % (2 **
        #                                   (t["T_MEMDEPTHMAP"][pos] - 48))]:
        #     t["T_MEMDEPTHMAP"][pos] += 1
        memdepthmap = c_pointer_to_bytearray(t["T_MEMDEPTHMAP"])
        fovmap = c_pointer_to_bytearray(t["fovmap"])
        libpr.age_some_memdepthmap_on_nonfov_cells(memdepthmap, fovmap)

    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))
    ord_v = ord("v")
    ord_0 = ord("0")
    ord_space = ord(" ")
    for pos in [pos for pos in range(world_db["MAP_LENGTH"] ** 2)
                if ord_v == t["fovmap"][pos]]:
        t["T_MEMDEPTHMAP"][pos] = ord_0
        t["T_MEMMAP"][pos] = world_db["MAP"][pos]
    if age_map:
        age_some_memdepthmap_on_nonfov_cells()
    t["T_MEMTHING"] = [mt for mt in t["T_MEMTHING"]
                       if ord_v != t["fovmap"][(mt[1] * world_db["MAP_LENGTH"])
                                               + mt[2]]]
    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 ord_v == 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=None):
    """Return val_string if possible integer >= min and <= max, else None."""
    try:
        val = int(val_string)
        if val < min or (max is not None and val > max):
            raise ValueError
        return val
    except ValueError:
        msg = "Ignoring: Please use integer >= " + str(min)
        if max is not None:
            msg += " and <= " + str(max)
        msg += "."
        print(msg)
        return None


def setter(category, key, min, max=None):
    """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))
    fovmap = c_pointer_to_bytearray(t["fovmap"])
    map = c_pointer_to_bytearray(world_db["MAP"])
    if libpr.build_fov_map(t["T_POSY"], t["T_POSX"], fovmap, map):
        raise RuntimeError("Malloc error in build_fov_Map().")


def log_help():
    """Send quick usage info to log."""
    strong_write(io_db["file_out"], "LOG "
                 + "Use 'w'/'e'/'s'/'d'/'x'/'c' to move, and 'w' to wait.\n")
    strong_write(io_db["file_out"], "LOG "
                 + "Use 'p' to pick up objects, and 'D' to drop them.\n")
    strong_write(io_db["file_out"], "LOG "
                 + "Some objects can be used (such as: eaten) by 'u' if "
                 + "they are in your inventory. "
                 + "Use 'UP'/'DOWN' to navigate the inventory.\n")
    strong_write(io_db["file_out"], "LOG "
                 + "Use 'l' to toggle 'look' mode (move an exploration cursor "
                 + "instead of the player over the map).\n")
    strong_write(io_db["file_out"], "LOG See README file for more details.\n")
    strong_write(io_db["file_out"], "LOG \n")


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.
    Dying actors drop all their things.
    """
    # 7DRL: Also decrements God's mood; deaths heavily so.
    # 7DRL: Return 1 if death, else 0.
    t["T_LIFEPOINTS"] -= 1
    world_db["GOD_MOOD"] -= 1  # #
    if 0 == t["T_LIFEPOINTS"]:
        sadness = world_db["ThingTypes"][t["T_TYPE"]]["TT_LIFEPOINTS"]  # #
        world_db["GOD_MOOD"] -= sadness  # #        
        for id in t["T_CARRIES"]:
            t["T_CARRIES"].remove(id)
            world_db["Things"][id]["T_POSY"] = t["T_POSY"]
            world_db["Things"][id]["T_POSX"] = t["T_POSX"]
            world_db["Things"][id]["carried"] = False
        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")
            strong_write(io_db["file_out"],
                         "LOG See README on how to start over.\n")
        else:
            t["fovmap"] = False
            t["T_MEMMAP"] = False
            t["T_MEMDEPTHMAP"] = False
            t["T_MEMTHING"] = []
        return sadness  # #
    return 0  # #


def add_gods_favor(i): # #
    """"Add to GOD_FAVOR, multiplied with factor growing log. with GOD_MOOD."""
    def favor_multiplier(i):
        x = 100
        threshold = math.e * x
        mood = world_db["GOD_MOOD"]
        if i > 0:
            if mood > threshold:
                i = i * math.log(mood / x)
            elif -mood > threshold:
                i = i / math.log(-mood / x)
        elif i < 0:
            if -mood > threshold:
                i = i * math.log(-mood / x)
            if mood > threshold:
                i = i / math.log(mood / x)
        return int(i)
    world_db["GOD_FAVOR"] += favor_multiplier(i)


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 enter_altar():  # #
     """What happens when the player enters the altar."""
     if world_db["FAVOR_STAGE"] > 9000:
        strong_write(io_db["file_out"],
                     "LOG You step on a soul-less slab of stone.\n")
        return
     strong_write(io_db["file_out"], "LOG YOU ENTER SACRED GROUND.\n")
     if world_db["FAVOR_STAGE"] == 0:
        world_db["FAVOR_STAGE"] = 1
        strong_write(io_db["file_out"], "LOG The Island God speaks to you: "
                     + "\"I don't trust you. You intrude on the island's "
                     + "affairs. I think you're a nuisance at best, and a "
                     + "danger to my children at worst. I will give you a "
                     + "chance to lighten my mood, however: For a while now, "
                     + "I've been trying to spread the plant "
                     + world_db["ThingTypes"][world_db["PLANT_0"]]["TT_NAME"]
                     + " (\""
                     + world_db["ThingTypes"][world_db["PLANT_0"]]["TT_SYMBOL"]
                     + "\"). I have not been very successful so far. Maybe "
                     + "you can make yourself useful there. I will count "
                     + "each further "
                     + world_db["ThingTypes"][world_db["PLANT_0"]]["TT_NAME"]
                     + " that grows to your favor.\n")
     elif world_db["GOD_FAVOR"] > 9000:
         world_db["FAVOR_STAGE"] = 9001
         strong_write(io_db["file_out"], "LOG The Island God speaks to you: "
                      + "\"You have proven yourself worthy of my respect. "
                      + "You were a good citizen to the island, and sometimes "
                      + "a better steward to its inhabitants than me. The "
                      + "island shall miss you when you leave. But you have "
                      + "earned the right to do so. Take this "
                      + world_db["ThingTypes"][world_db["SLIPPERS"]]["TT_NAME"]
                      + " and USE it when you please. It will take you to "
                      + "where you came from. (But do feel free to stay here "
                      + "as long as you like.)\"\n")
         id = id_setter(-1, "Things")
         world_db["Things"][id] = new_Thing(world_db["SLIPPERS"],
                                            world_db["altar"])


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."""
    # 7DRL: Player wounding (worse: killing) others will lower God's favor.
    # 7DRL: Player entering the altar triggers enter_altar().
    # 7DRL: Player with axe chops down trees.
    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]
        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]
            if t == world_db["Things"][0]:
                hitted_type = world_db["Things"][hit_id]["T_TYPE"]
                hitted_name = world_db["ThingTypes"][hitted_type]["TT_NAME"]
                strong_write(io_db["file_out"], "LOG You wound " + hitted_name
                                                + ".\n")
                add_gods_favor(-1)  # #
            elif 0 == hit_id:
                hitter_name = world_db["ThingTypes"][t["T_TYPE"]]["TT_NAME"]
                strong_write(io_db["file_out"], "LOG " + hitter_name +
                                                " wounds you.\n")
            test = decrement_lifepoints(world_db["Things"][hit_id])  # #(test=)
            if test and t == world_db["Things"][0]:  # #
                add_gods_favor(-test)  # #
            return
        if (ord("X") == world_db["MAP"][pos]  # #
            or ord("|") == world_db["MAP"][pos]):  # #
            carries_axe = False  # #
            for id in t["T_CARRIES"]:  # # 
                type = world_db["Things"][id]["T_TYPE"]  # #
                if world_db["ThingTypes"][type]["TT_TOOL"] == "axe":  # #
                    carries_axe = True  # #
                    break  # #
            if carries_axe:  # #
                axe_name = world_db["ThingTypes"][type]["TT_NAME"]  # #
                if t == world_db["Things"][0]:  # #
                    strong_write(io_db["file_out"], "LOG With your "  # #
                                                    + axe_name  # #
                                                    + ", you chop!\n")  # #
                    add_gods_favor(-1)  # #
                chop_power = world_db["ThingTypes"][type]["TT_TOOLPOWER"]
                case_X = world_db["MAP"][pos] == ord("X")  # #
                if (chop_power > 0  # #
                    and ((case_X and  # #
                          0 == int(rand.next() / chop_power))  # #
                    or (not case_X and  # #
                             0 == int(rand.next() / (3 * chop_power))))):  # #
                    if t == world_db["Things"][0]:  # #
                        strong_write(io_db["file_out"],  # #
                                     "LOG You chop it down.\n")  # #
                    add_gods_favor(-10)  # #
                    world_db["MAP"][pos] = ord(".")   # #
                    i = 3 if case_X else 1  # #
                    for i in range(i):  # #
                        id = id_setter(-1, "Things")  # #
                        world_db["Things"][id] = \
                          new_Thing(world_db["LUMBER"],  # #
                                    (move_result[1], move_result[2]))  # # 
                    build_fov_map(t)  # #
                return   # #
        passable = ("." == chr(world_db["MAP"][pos]) or
                    ":" == chr(world_db["MAP"][pos]) or # #
                    "_" == chr(world_db["MAP"][pos])) # #
    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")
            if (move_result[1] == world_db["altar"][0] and  # #
                move_result[2] == world_db["altar"][1]):  # #
                enter_altar()  # #
    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 most nutritious Thing.
    # 7DRL: Non-player picking up player-dropped consumable -> GOD_FAVOR gain.
    used_slots = len(t["T_CARRIES"]) # #
    if used_slots < world_db["ThingTypes"][t["T_TYPE"]]["TT_STORAGE"]: # #
        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 = ids[0]
            nutritious = 0
            for id in ids:
                type = world_db["Things"][id]["T_TYPE"]
                if world_db["ThingTypes"][type]["TT_TOOL"] == "food" \
                and world_db["ThingTypes"][type]["TT_TOOLPOWER"] > nutritious:
                    nutritious = world_db["ThingTypes"][type]["TT_TOOLPOWER"]
                    highest_id = id
            world_db["Things"][highest_id]["carried"] = True
            type = world_db["Things"][highest_id]["T_TYPE"]  # #
            if (t != world_db["Things"][0] # #
                and world_db["Things"][highest_id]["T_PLAYERDROP"]  # #
                and world_db["ThingTypes"][type]["TT_TOOL"] == "food"):  # #
                score = world_db["ThingTypes"][type]["TT_TOOLPOWER"] / 32  # #
                add_gods_favor(score)  # #
                world_db["Things"][highest_id]["T_PLAYERDROP"] = 0  # #
            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")
    elif t == world_db["Things"][0]: # #
        strong_write(io_db["file_out"], "LOG Can't pick up object: " + # #
                                        "No storage room to carry more.\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")
            world_db["Things"][id]["T_PLAYERDROP"] = 1  # #
    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.
    # 7DLR: Handle SLIPPERS-type Thing use.
    if len(t["T_CARRIES"]):
        id = t["T_CARRIES"][t["T_ARGUMENT"]]
        type = world_db["Things"][id]["T_TYPE"]
        if type == world_db["SLIPPERS"]:  # #
            if t == world_db["Things"][0]:  # #
                strong_write(io_db["file_out"], "LOG You use the "  # #
                             + world_db["ThingTypes"][type]["TT_NAME"]  # #
                             + ". It glows in wondrous colors, and emits "  # #
                             + "a sound as if from a dying cat. The "  # #
                             + "Island God laughs.\n")  # #
            t["T_LIFEPOINTS"] = 1  # #
            decrement_lifepoints(t)  # #
        elif (world_db["ThingTypes"][type]["TT_TOOL"] == "axe"  # #
              and t == world_db["Things"][0]):  # #
                strong_write(io_db["file_out"],  # #
                             "LOG To use this item for chopping, move "  # #
                             "towards a tree while carrying it in "  # #
                             "your inventory.\n")  # #
        elif (world_db["ThingTypes"][type]["TT_TOOL"] == "carpentry"):  # #
            pos = t["T_POSY"] * world_db["MAP_LENGTH"] + t["T_POSX"]
            if (world_db["MAP"][pos] == ord("X")  # #
                or world_db["MAP"][pos] == ord("|")):  # #
                strong_write(io_db["file_out"],  # #
                             "LOG Can't build when standing on barrier.\n")  # #
                return
            for id in [id for id in world_db["Things"]
                       if not 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"]]:
                 strong_write(io_db["file_out"],
                              "LOG Can't build when standing objects.\n")  # #
                 return
            for id in t["T_CARRIES"]:  # #
                type_tool = world_db["Things"][id]["T_TYPE"]  # #
                if (world_db["ThingTypes"][type_tool]["TT_TOOL"]  # #
                    == "carpentry"):  # #
                    break  # #
            wood_id = None  # #
            for id in t["T_CARRIES"]:  # #
                type_material = world_db["Things"][id]["T_TYPE"]  # #
                if (world_db["ThingTypes"][type_material]["TT_TOOL"]  # #
                    == "wood"):  # #
                    wood_id = id  # #
                    break  # #
            if wood_id != None:  # #
                t["T_CARRIES"].remove(wood_id)  # #
                del world_db["Things"][wood_id]  # #
                world_db["MAP"][pos] = ord("|")  # #
                strong_write(io_db["file_out"], "LOG With your "  # #
                             + world_db["ThingTypes"][type_tool]["TT_NAME"]  # #
                             + " you build a wooden barrier from your "  # #
                             + world_db["ThingTypes"][type_material]  # #
                               ["TT_NAME"]  # #
                             + ".\n")  # #
            else:  # #
                strong_write(io_db["file_out"], "LOG You can't use a "  # #
                             + world_db["ThingTypes"][type_tool]["TT_NAME"]  # #
                             + " without some wood in your inventory.\n")  # #
        elif world_db["ThingTypes"][type]["TT_TOOL"] == "food":
            t["T_CARRIES"].remove(id)
            del world_db["Things"][id]
            t["T_SATIATION"] += world_db["ThingTypes"][type]["TT_TOOLPOWER"]
            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, prol_map):
    """To chance of 1/TT_PROLIFERATE,create  t offspring in open neighbor cell.

    Naturally only works with TT_PROLIFERATE > 0. The neighbor cell must be be
    marked "." in prol_map. If there are several map cell candidates, one is
    selected randomly.
    """
    # 7DRL: success increments God's mood
    # 7DRL: Things proliferate only on ":" ground.
    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 ord(":") == prol_map[mv_result[1]  # #
            # if mv_result[0] and ord(".") == prol_map[mv_result[1]
                                                     * world_db["MAP_LENGTH"]
                                                     + 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
            world_db["GOD_MOOD"] += 1  # #
            if (world_db["FAVOR_STAGE"] > 0  # #
                and t["T_TYPE"] == world_db["PLANT_0"]):
                world_db["GOD_FAVOR"] += 5


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.
    """
    # 7DRL: Successful heals increment God's mood.
    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
        world_db["GOD_MOOD"] += 1  # #
        t["T_SATIATION"] -= 32
        if t == world_db["Things"][0]:
            strong_write(io_db["file_out"], "LOG You heal.\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")
        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 zero_score_map_where_char_on_memdepthmap(c):
        # OUTSOURCED FOR PERFORMANCE REASONS TO libplomrogue.so:
        # 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)
        map = c_pointer_to_bytearray(t["T_MEMDEPTHMAP"])
        if libpr.zero_score_map_where_char_on_memdepthmap(c, map):
            raise RuntimeError("No score map allocated for "
                               "zero_score_map_where_char_on_memdepthmap().")

    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_TOOL"] == "food":
                    return True
        return False

    def set_cells_passable_on_memmap_to_65534_on_scoremap():
        # OUTSOURCED FOR PERFORMANCE REASONS TO libplomrogue.so:
        # ord_dot = ord(".")
        # memmap = t["T_MEMMAP"]
        # for i in [i for i in range(world_db["MAP_LENGTH"] ** 2)
        #            if ord_dot == memmap[i]]:
        #     set_map_score(i, 65534) # i.e. 65535-1
        map = c_pointer_to_bytearray(t["T_MEMMAP"])
        if libpr.set_cells_passable_on_memmap_to_65534_on_scoremap(map):
            raise RuntimeError("No score map allocated for "
                        "set_cells_passable_on_memmap_to_65534_on_scoremap().")

    def init_score_map():
        test = libpr.init_score_map()
        if test:
            raise RuntimeError("Malloc error in init_score_map().")
        ord_v = ord("v")
        ord_blank = ord(" ")
        set_cells_passable_on_memmap_to_65534_on_scoremap()
        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 \
                   ord_v == 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 \
                   ord_v == 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 ord_blank != t["T_MEMMAP"][mt[1]
                                                    * world_db["MAP_LENGTH"]
                                                    + mt[2]]
                       if world_db["ThingTypes"][mt[0]]["TT_TOOL"] == "food"]:
                set_map_score(mt[1] * world_db["MAP_LENGTH"] + mt[2], 0)
        elif "s" == filter:
            zero_score_map_where_char_on_memdepthmap(mem_depth_c[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_food(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_TOOL"] == "food"]:
        return True
    return False


def get_inventory_slot_to_consume(t):
    """Return slot Id of strongest consumable in t's inventory, else -1."""
    cmp_food = 0
    selection = -1
    i = 0
    for id in t["T_CARRIES"]:
        type = world_db["Things"][id]["T_TYPE"]
        if world_db["ThingTypes"][type]["TT_TOOL"] == "food" \
           and world_db["ThingTypes"][type]["TT_TOOLPOWER"] > cmp_food:
            cmp_food = world_db["ThingTypes"][type]["TT_TOOLPOWER"]
            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.
    """
    # 7DRL add: Don't pick up or search things when inventory is full.
    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_food(t) \
             and (len(t["T_CARRIES"]) < # #
                 world_db["ThingTypes"][t["T_TYPE"]]["TT_STORAGE"]): # #
            t["T_COMMAND"] = [id for id in world_db["ThingActions"]
                              if world_db["ThingActions"][id]["TA_NAME"]
                                 == "pick_up"][0]
        elif (not
              (len(t["T_CARRIES"]) < # #
                world_db["ThingTypes"][t["T_TYPE"]]["TT_STORAGE"] # #
               and 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"]:
        proliferable_map = world_db["MAP"][:]
        for id in [id for id in world_db["Things"]
                   if not world_db["Things"][id]["carried"]]:
            y = world_db["Things"][id]["T_POSY"]
            x = world_db["Things"][id]["T_POSX"]
            proliferable_map[y * world_db["MAP_LENGTH"] + x] = ord("X")
        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)
                hunger(Thing)
                if Thing["T_LIFEPOINTS"]:
                    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
            thingproliferation(Thing, proliferable_map)
        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_PLAYERDROP": 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, else >= -1), but <0 or (if start_at_1)
    <1, calculate new ID: lowest unused ID >=0 or (if start_at_1) >= 1. None is
    always returned when no new object is created, otherwise the new object's
    ID.
    """
    min = 0 if start_at_1 else -1
    if str == type(id):
        id = integer_test(id, min)
    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)):
                id = 0 if start_at_1 else -1
                while 1:
                    id = id + 1
                    if id not in world_db[category]:
                        break
            if id_store:
                id_store.id = id
    return id


def command_ping():
    """Send PONG line to server output file."""
    strong_write(io_db["file_out"], "PONG\n")


def command_quit():
    """Abort server process."""
    if None == opts.replay:
        if world_db["WORLD_ACTIVE"]:
            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_makeworld(seed_string):
    """(Re-)build game world, i.e. map, things, to a new turn 1 from seed.

    Seed rand with seed. Do more only with a "wait" ThingAction and
    world["PLAYER_TYPE"] matching ThingType of TT_START_NUMBER > 0. Then,
    world_db["Things"] emptied, call make_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.
    Call log_help().
    """

    # def free_pos(plant=False):
    def free_pos(plant=False):  # #
        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"]
                pos = y * world_db["MAP_LENGTH"] + x;
                if (not plant  # #
                    and "." == chr(world_db["MAP"][pos])) \
                   or ":" == chr(world_db["MAP"][pos]):  # #
                    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
    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: 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: No thing action with name 'wait' defined.")
        return
    if not world_db["SLIPPERS"] in world_db["ThingTypes"]:  # #
        print("Ignoring: No valid SLIPPERS set.")  # #
        return  # #
    if not world_db["PLANT_0"] in world_db["ThingTypes"]:  # #
        print("Ignoring: No valid PLANT_0 set.")  # #
        return  # #
    if not world_db["LUMBER"] in world_db["ThingTypes"]:  # #
        print("Ignoring: No valid LUMBER set.")  # #
        return  # #
    world_db["Things"] = {}
    make_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())
    if not world_db["Things"][0]["fovmap"]:
        empty_fovmap = bytearray(b" " * world_db["MAP_LENGTH"] ** 2)
        world_db["Things"][0]["fovmap"] = empty_fovmap
    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")
                plantness = world_db["ThingTypes"][type]["TT_PROLIFERATE"]  # #
                world_db["Things"][id] = new_Thing(type, free_pos(plantness))
    strong_write(io_db["file_out"], "NEW_WORLD\n")
    log_help()


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
        world_db["MAP"] = False
        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), and a
    map. On activation, rebuild all Things' FOVs, and the player's map memory.
    Also call log_help().
    """
    # 7DRL: altar must be on map, and (valid) SLIPPERS and PLANT_0 and LUMBER
    # must be set for world activation.
    val = integer_test(worldactive_string, 0, 1)
    if None != 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
            valid_slippers = world_db["SLIPPERS"] in world_db["ThingTypes"]  # #
            valid_plant0 = world_db["PLANT_0"] in world_db["ThingTypes"]  # #
            valid_lumber = world_db["PLANT_0"] in world_db["ThingTypes"]  # #
            altar_found = False  # #
            if world_db["MAP"]:  # #
                pos = world_db["MAP"].find(b'_')  # #
                if pos > 0:  # #
                    y = int(pos / world_db["MAP_LENGTH"])  # #
                    x = pos % world_db["MAP_LENGTH"]  # #
                    world_db["altar"] = (y, x)  # #
                    altar_found = True  # #
            if (wait_exists and player_exists and world_db["MAP"]
                and altar_found and valid_slippers and valid_plant0  # #
                and valid_lumber):  # #
                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)
                if not world_db["Things"][0]["T_LIFEPOINTS"]:
                    empty_fovmap = bytearray(b" " * world_db["MAP_LENGTH"] ** 2)
                    world_db["Things"][0]["fovmap"] = empty_fovmap
                world_db["WORLD_ACTIVE"] = 1
                log_help()
            else:
                print("Ignoring: Not all conditions for world activation met.")


def command_slippers(str_int):  # #
    """Set SLIPPERS, but deactivate world if not in ThingTypes."""
    val = integer_test(str_int, 0)
    if None != val:
        world_db["SLIPPERS"] = val
        if world_db["WORLD_ACTIVE"] and \
           world_db["SLIPPERS"] not in world_db["ThingTypes"]:
            world_db["WORLD_ACTIVE"] = 0
            print("SLIPPERS matches no known ThingTypes, deactivating world.")


def command_plant0(str_int):  # #
    """Set PLANT_0, but deactivate world if not in ThingTypes."""
    val = integer_test(str_int, 0)
    if None != val:
        world_db["PLANT_0"] = val
        if world_db["WORLD_ACTIVE"] and \
           world_db["PLANT_0"] not in world_db["ThingTypes"]:
            world_db["WORLD_ACTIVE"] = 0
            print("PLANT_0 matches no known ThingTypes, deactivating world.")


def command_lumber(str_int):  # #
    """Set LUMBER, but deactivate world if not in ThingTypes."""
    val = integer_test(str_int, 0)
    if None != val:
        world_db["LUMBER"] = val
        if world_db["WORLD_ACTIVE"] and \
           world_db["LUMBER"] not in world_db["ThingTypes"]:
            world_db["WORLD_ACTIVE"] = 0
            print("LUMBER matches no known ThingTypes, deactivating world.")


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)
    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)
    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)
    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)
    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 (world or Thing's) map of maptype's int(str_int)-th line to mapline.

    If no map of maptype exists yet, initialize it with ' ' bytes first.
    """

    def valid_map_line(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:
                return val
        return None

    def nonThingMap_helper(str_int, mapline):
        val = valid_map_line(str_int, mapline)
        if None != val:
            length = world_db["MAP_LENGTH"]
            if not world_db["MAP"]:
                map = bytearray(b' ' * (length ** 2))
            else:
                map = world_db["MAP"]
            map[val * length:(val * length) + length] = mapline.encode()
            if not world_db["MAP"]:
                world_db["MAP"] = map

    @test_Thing_id
    def ThingMap_helper(str_int, mapline):
        val = valid_map_line(str_int, mapline)
        if None != val:
            length = world_db["MAP_LENGTH"]
            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()
            if not world_db["Things"][command_tid.id][maptype]:
                world_db["Things"][command_tid.id][maptype] = map

    return nonThingMap_helper if maptype == "MAP" else ThingMap_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, TT_TOOL to
    "", others: 0.
    """
    id = id_setter(id_string, "ThingTypes", command_ttid)
    if None != id:
        world_db["ThingTypes"][id] = {
            "TT_NAME": "(none)",
            "TT_TOOLPOWER": 0,
            "TT_LIFEPOINTS": 0,
            "TT_PROLIFERATE": 0,
            "TT_START_NUMBER": 0,
            "TT_STORAGE": 0, # #
            "TT_SYMBOL": "?",
            "TT_CORPSE_ID": id,
            "TT_TOOL": ""
        }


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_tttool(name):
    """Set TT_TOOL of selected ThingType."""
    world_db["ThingTypes"][command_ttid.id]["TT_TOOL"] = 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)
    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]) 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),
    "THINGS_HERE": (2, True, command_thingshere),
    "MAKE_WORLD": (1, False, command_makeworld),
    "SEED_RANDOMNESS": (1, False, command_seedrandomness),
    "TURN": (1, False, setter(None, "TURN", 0, 65535)),
    "GOD_MOOD": (1, False, setter(None, "GOD_MOOD", -32768, 32767)),  # #
    "GOD_FAVOR": (1, False, setter(None, "GOD_FAVOR", -32768, 32767)),  # #
    "PLAYER_TYPE": (1, False, setter(None, "PLAYER_TYPE", 0)),
    "MAP_LENGTH": (1, False, command_maplength),
    "WORLD_ACTIVE": (1, False, command_worldactive),
    "MAP": (2, False, setter_map("MAP")),
    "FAVOR_STAGE": (1, False, setter(None, "FAVOR_STAGE", 0, 65535)),  # #
    "SLIPPERS": (1, False, command_slippers),  # #
    "PLANT_0": (1, False, command_plant0),  # #
    "LUMBER": (1, False, command_lumber),  # #
    "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_TOOL": (1, False, command_tttool),
    "TT_SYMBOL": (1, False, command_ttsymbol),
    "TT_CORPSE_ID": (1, False, command_ttcorpseid),
    "TT_TOOLPOWER": (1, False, setter("ThingType", "TT_TOOLPOWER", 0, 65535)),
    "TT_START_NUMBER": (1, False, setter("ThingType", "TT_START_NUMBER",
                                         0, 255)),
    "TT_PROLIFERATE": (1, False, setter("ThingType", "TT_PROLIFERATE",
                                        0, 65535)),
    "TT_LIFEPOINTS": (1, False, setter("ThingType", "TT_LIFEPOINTS", 0, 255)),
    "TT_STORAGE": (1, False, setter("ThingType", "TT_STORAGE", 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")),
    "T_PLAYERDROP": (1, False, setter("Thing", "T_PLAYERDROP", 0, 1)),  # #
    "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)
}
# TODO: Unhandled cases: (Un-)killing animates (esp. player!) with T_LIFEPOINTS.


"""World state database. With sane default values. (Randomness is in rand.)"""
world_db = {
    "TURN": 0,
    "MAP_LENGTH": 64,
    "PLAYER_TYPE": 0,
    "WORLD_ACTIVE": 0,
    "GOD_MOOD": 0,  # #
    "GOD_FAVOR": 0,  # #
    "MAP": False,
    "FAVOR_STAGE": 0,  # #
    "SLIPPERS": 0,  # #
    "PLANT_0": 0,  # #
    "LUMBER": 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_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,
    "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()
    if opts.verbose:
        io_db["verbose"] = True
    if None != opts.replay:
        replay_game()
    else:
        play_game()
except SystemExit as exit:
    print("ABORTING: " + exit.args[0])
except:
    print("SOMETHING WENT WRONG IN UNEXPECTED WAYS")
    raise
finally:
    cleanup_server_io()