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How to add Lua scripting to SMAUG

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Posted by Darwin   USA  (125 posts)  [Biography] bio
Date Reply #60 on Sat 28 Jul 2007 06:10 AM (UTC)
Message
Thanks for all your help.

Now on to adding the tasks.
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Posted by Darwin   USA  (125 posts)  [Biography] bio
Date Reply #61 on Sat 28 Jul 2007 10:14 AM (UTC)
Message
Well, so much for that. After setting up the resets, editing the tasks and setting locations for whereis, I find that the lua call for the reset crashes the mud. Comment that out since it's not really needed. Recompile, start it up log in, the task and whereis commands display no output

The mud registers that the commands are being used but it seems as though the call_lua function isn't returning anything or processing any data given to it.

I've been at this all day so it's probably something minor that I overlooked. I'll try again tomorrow.
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Posted by Darwin   USA  (125 posts)  [Biography] bio
Date Reply #62 on Sat 28 Jul 2007 09:12 PM (UTC)
Message
I added some debugging stuff in the call_lua function to confirm that the function was being called. It is indeed being called and with the right arguments. It appears that the find_lua_function err.. function isn't finding the uh.. function.
This is the output I get from the debugging I added:
task

Inside call_lua function.
        ch = Darwin, fname = task, argument = 
Did not find lua function: task

whereis

Inside call_lua function.
        ch = Darwin, fname = whereis, argument = 
Did not find lua function: whereis

The call_lua function gets called in the other events and also prints out the debugging info as well:
Inside call_lua function.
        ch = Darwin, fname = looking, argument = (null)
Inside call_lua function.
        ch = Darwin, fname = entered_game, argument = Darwin

So I know those, at least, are working.

Ideas on what broke this?
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Posted by Nick Gammon   Australia  (23,016 posts)  [Biography] bio   Forum Administrator
Date Reply #63 on Sat 28 Jul 2007 09:41 PM (UTC)
Message
Look at the MUD output log (ie. for bug messages). It won't find those functions if there was an error loading the Lua startup script. For example, if I deliberately introduce an error into it, and connect, I see stuff like this:


Sun Jul 29 07:35:12 2007 :: Admin (10.0.0.4) has connected.
Sun Jul 29 07:35:12 2007 :: [*****] BUG: Error loading Lua startup file ../lua/startup.lua:
 ../lua/startup.lua:2: '=' expected near 'afd'
Sun Jul 29 07:35:12 2007 :: [*****] BUG: Warning: Lua script function 'reconnected' does not exist


The startup.lua file implements those commands by "requiring" (loading in) extra files, like this:


-- install other stuff here (like task system)

task    = require ("tasks").task  -- module - provides 'task' command handler
whereis = require ("whereis").whereis -- module - provides 'whereis' command handler


If that isn't it, take a look at the start of find_lua_function:


static lua_State * find_lua_function (CHAR_DATA * ch, const char * fname)
  {
  lua_State *L = ch->L;
  
  if (!L || !fname)
    return NULL;  /* can't do it */


The first thing it checks is that you have a Lua state set up (ie. not a NULL pointer). If the state wasn't initialized on a reconnect that would be it. It was working yesterday.

Have you done a hotboot? We found you needed to set up the Lua state after doing that. You need a call to open the Lua state when the hotboot finishes. This is the code I had there:


        char_to_room( d->character, d->character->in_room );
         act( AT_MAGIC, "A puff of ethereal smoke dissipates around you!", d->character, NULL, NULL, TO_CHAR );
         act( AT_MAGIC, "$n appears in a puff of ethereal smoke!", d->character, NULL, NULL, TO_ROOM );
         d->connected = CON_PLAYING;
         open_lua (d->character);  /* fire up Lua state */
         call_lua (d->character, "reconnected", d->character->name);


- Nick Gammon

www.gammon.com.au, www.mushclient.com
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Posted by Darwin   USA  (125 posts)  [Biography] bio
Date Reply #64 on Sat 28 Jul 2007 10:19 PM (UTC)
Message
Ah, as usual, it was my tweaking that lead to my own downfall. I mistakenly left out a double quote from a task function I added. After fixing that, it all works as it should.

Thanks a ton. This will certainly help to add a lot of variety to the game.
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Posted by Darwin   USA  (125 posts)  [Biography] bio
Date Reply #65 on Sun 29 Jul 2007 07:45 AM (UTC)
Message
Thanks, Nick. This is really nice having this scripting available for added functionality to the mud code. I'm actually having fun adding tasks and stuff. The flexibility of this code is really nice. There's so many possibilities with it.
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Posted by Nick Gammon   Australia  (23,016 posts)  [Biography] bio   Forum Administrator
Date Reply #66 on Sun 29 Jul 2007 07:54 AM (UTC)
Message
Glad it is working for you.

There is a lot of scope here for MUDs to make quests (tasks) that are fun, and also help advance players along (eg. to find new towns).

For higher level players, you can give them quests which reward them with gold, experience, and equipment for doing the quests.

Another interesting add-on would be a reputation system, but I might leave that for a while. :)

- Nick Gammon

www.gammon.com.au, www.mushclient.com
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Posted by Darwin   USA  (125 posts)  [Biography] bio
Date Reply #67 on Sun 29 Jul 2007 08:45 AM (UTC)
Message
I've been tinkering with the finish_task function trying to make it use the mud.msg_game function to send a mud-wide [INFO] line informing everyone of a completed task. This is the same kind of line that serves the same function for the other various quests we have. I've tried this with no success:
mud.msg_game (string.format("&Y[INFO] %s has completed task: %s", mud.char_name, task.name))

Basically, I want the line to be in yellow and formatted like:
[INFO] <player> has completed task: <task name>

I'm hoping that is the right function to use. However, it just sends out a script error message and exits the finish_task function prematurely before marking the task complete.

The task module is great and my players are loving it. They also think the whereis command is "awesome" too. :)
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Posted by Nick Gammon   Australia  (23,016 posts)  [Biography] bio   Forum Administrator
Date Reply #68 on Sun 29 Jul 2007 09:24 AM (UTC)
Message
It helps to copy and paste the error message.

- Nick Gammon

www.gammon.com.au, www.mushclient.com
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Posted by Nick Gammon   Australia  (23,016 posts)  [Biography] bio   Forum Administrator
Date Reply #69 on Sun 29 Jul 2007 09:26 AM (UTC)
Message
Probably the problem is your use of mud.char_name.

That is a function, see:

http://www.gammon.com.au/forum/?id=8015

That means, to call it you need to supply arguments, even if it is an empty argument string. Try this:


mud.msg_game (string.format("&Y[INFO] %s has completed task: %s", mud.char_name (), task.name))


- Nick Gammon

www.gammon.com.au, www.mushclient.com
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Posted by Darwin   USA  (125 posts)  [Biography] bio
Date Reply #70 on Mon 30 Jul 2007 12:24 AM (UTC)
Message
The error message, I think, was something generic about a script error and the premature exiting of the function was due to where I had placed that line. In either case, your suggestion worked and I moved the line to below setting the task complete so even if it did error again, the task would still be marked as completed. The players are loving these things and wanting more. Great job on such a simple and flexible questing system. :)
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Posted by Orik   USA  (182 posts)  [Biography] bio
Date Reply #71 on Fri 17 Aug 2007 06:56 AM (UTC)
Message
Ok, my server has lua 5.1 on it. I put my mud on and tried to compile. It compiles all the way to the very end and them I get a ton of undefined references. I'm not linking correctly or something, I don't know.

here's my makefile:

CC      = g++
#PROF    = -p

#Uncomment to compile in Cygwin
#CYGWIN = -DCYGWIN

#Uncomment the line below if you are getting undefined references to dlsym, dlopen, and dlclose.
#Comment it out if you get errors about ldl not being found.
NEED_DL = -ldl

#Some systems need this for dynamic linking to work.
EXPORT_SYMBOLS = -export-dynamic

# Uncomment the two lines below if compiling on a Solaris box
#SOLARIS_FLAG = -Dsun -DSYSV
#SOLARIS_LINK = -lnsl -lsocket

#IMC2 - Comment out to disable IMC2 support
IMC = 1

W_FLAGS = -Wall -Werror -Wshadow -Wformat-security -Wpointer-arith -Wcast-align -Wredundant-decls -Wconversion

C_FLAGS = -g2 $(W_FLAGS) $(SOLARIS_FLAG) $(PROF) $(EXPORT_SYMBOLS)
L_FLAGS = $(PROF) $(SOLARIS_LINK) -lz $(NEED_DL) ~/old/lua/lib/liblua.a -llua -lm
#D_FLAGS : For the DNS Slave process. No need in linking all the extra libs for this.
D_FLAGS = -g2 -O $(PROF) $(SOLARIS_LINK)

C_FILES = act_comm.c act_info.c act_move.c act_obj.c act_wiz.c ban.c board.c boards.c \
          build.c chess.c clans.c color.c comm.c comments.c const.c db.c deity.c \
          dns.c fight.c handler.c hashstr.c hint.c hotboot.c imm_host.c interp.c \
          liquids.c magic.c makeobjs.c mapout.c mapper.c mccp.c \
          misc.c mpxset.c mud_comm.c mud_prog.c news.c planes.c player.c polymorph.c \
          renumber.c reset.c save.c services.c sha256.c shops.c skills.c special.c tables.c \
          track.c update.c variables.c lua_scripting.c lua_bits.c mt19937ar.c lua_tables.c \
          mem.c


ifdef IMC
   C_FILES := imc.c $(C_FILES)
   C_FLAGS := $(C_FLAGS) -DIMC -DIMCSMAUG
endif

O_FILES := $(patsubst %.c,o/%.o,$(C_FILES))

H_FILES = $(wildcard *.h)

all:
        $(MAKE) -s smaug
        $(MAKE) -s dns

# pull in dependency info for *existing* .o files
-include dependencies.d

ifdef CYGWIN
smaug: $(O_FILES)
        rm -f smaug.exe
        dlltool --export-all --output-def smaug.def $(O_FILES)
        dlltool --dllname smaug.exe --output-exp smaug.exp --def smaug.def
        $(CC) -o smaug.exe $(O_FILES) smaug.exp $(L_FLAGS)
        @echo "Generating dependency file ...";
        @$(CC) -MM $(C_FLAGS) $(C_FILES) > dependencies.d
        @perl -pi -e 's.^([a-z]).o/$$1.g' dependencies.d
        @echo "Done compiling mud.";
        chmod g+w smaug.exe
        chmod a+x smaug
        chmod g+w $(O_FILES)

clean:
        @rm -f o/*.o smaug dependencies.d resolver resolver.o *~
endif

dns: resolver.o
        rm -f resolver
        $(CC) $(D_FLAGS) -o resolver resolver.o
        @echo "Done compiling DNS resolver.";
        chmod g+w resolver
        chmod a+x resolver
        chmod g+w resolver.o

indent:
        indent -ts3 -nut -nsaf -nsai -nsaw -npcs -npsl -ncs -nbc -bls -prs -bap -cbi0 -cli3 -bli0 -l125 -lp -i3 -cdb -c1 -cd1 -sc -pmt $(C_FILES)
        indent -ts3 -nut -nsaf -nsai -nsaw -npcs -npsl -ncs -nbc -bls -prs -bap -cbi0 -cli3 -bli0 -l125 -lp -i3 -cdb -c1 -cd1 -sc -pmt $(H_FILES)

indentclean:
        rm *.c~ *.h~

o/%.o: %.c
        echo "  Compiling $@....";
        $(CC) -c $(C_FLAGS) $< -o $@

.c.o: mud.h
        $(CC) -c $(C_FLAGS) $<
                                                        


I've tried different types of L_FLAGS
This:

L_FLAGS = $(PROF) $(SOLARIS_LINK) -lz $(NEED_DL) ~/old/lua/lib/liblua.a -llua -lm


This:

L_FLAGS = $(PROF) $(SOLARIS_LINK) -lz $(NEED_DL) ~/old/lua/lib/liblua.a -lm


This:

L_FLAGS = $(PROF) $(SOLARIS_LINK) -lz $(NEED_DL) -llua -lm


This:

L_FLAGS = $(PROF) $(SOLARIS_LINK) -lz $(NEED_DL) -lm


and it still errors at the very end.

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Posted by David Haley   USA  (3,881 posts)  [Biography] bio
Date Reply #72 on Fri 17 Aug 2007 09:41 AM (UTC)
Message
What kind of errors are we talking about here?

David Haley aka Ksilyan
Head Programmer,
Legends of the Darkstone

http://david.the-haleys.org
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Posted by Orik   USA  (182 posts)  [Biography] bio
Date Reply #73 on Fri 17 Aug 2007 08:56 PM (UTC)

Amended on Fri 17 Aug 2007 08:57 PM (UTC) by Orik

Message
I installed it locally and it worked first time.

For future reference, to make locally, you have to do this:

make linux

then

make local

Then point to your liblua.a file in your Makefile:

L_FLAGS = $(PROF) $(SOLARIS_LINK) -lz $(NEED_DL) ~/your/folder/lib/liblua.a -lm
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Posted by Keberus   (31 posts)  [Biography] bio
Date Reply #74 on Mon 01 Oct 2007 01:59 AM (UTC)
Message
Okay, I am trying to add lua to my FotE based mud. I got all of the regular errors out and get to the end. I think there's a problem linking the lua headers but don't know why. Here are the errors...


lua_scripting.c:732: undefined reference to `lua_isnumber(lua_State*, int)'
lua_scripting.c:739: undefined reference to `lua_createtable(lua_State*, int, int)'
lua_scripting.c:743: undefined reference to `lua_pushstring(lua_State*, char const*)'
lua_scripting.c:743: undefined reference to `lua_setfield(lua_State*, int, char const*)'


Thats not all of them, but a bunch that look like that. I have the -llua in the L_FLAGS of my makefile like I read to do. Also, I downloaded FUSS with lua support added by Nick, and it compiled error free. So can anyone tell me what I am doing wrong. Apparently the lua is working globally for it to work with FUSS w/lua.

Thanks in Advance,
KeB
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