server/pod/events.pod

=head1 CROSSFIRE+ PLUG-IN EVENTS

This document briefly describes each plug-in event. It is also used to
generate the event-list itself, so is always complete. Be careful wehn
changing it, though.

=head2 NOTATION

the event description below uses a variant of the forth stack notation -
an opening parenthesis followed by the type of each parameter, optionally
followed by two dashes and the returning parameters. If the latter is
missing, the event will be invoked but cannot change wether the event gets
processed.

If it is specified (even if no return values are supported), a plug-in
can override (e.g. using C<cf::override> in Perl) event processing,
basically short-circuiting it. For example, if you override from within a
player BIRTH event, nothing much will happen with respect to the built-in
processing, but if you override from within a player TELL event, the tell
will be ignored (presumably your plug-in took care of it).


=head2 ATTACHABLE EVENTS

No time to document this, screw me.

=head3 instantiate (object init-args...)

An object was instantiated.

For objects, this event occurs when a map is loaded for the first time
when it was instantiated from an archetype, or when the object was created
dynamically. The arguments are as specified in the C<attach> attribute of
the object or archetype.

This is useful to initialise any per-object state you might need.

=head3 reattach (object)

Invoked whenever attachments/plug-ins need to get reattached to the
object. This usually happens when it was loaded from disk, or when the
server was reloaded. This event will only be generated if the object has
attachments.

=head3 clone (object destination)

An object with _attached plugin_ is cloned, that is, a copy was made. The
copy automatically has all attachments the original object had. The perl
variables get copied in a shallow way (references are shared between
instances). If this is not the behaviour you need, you have to adjust the
B<destination> object as you see fit.

=head3 destroy (object -- )

Invoked when the crossfire object gets destroyed, and only when the object
has a handler for this event. This event can occur many times, as its
called when the in-memory object is destroyed, not when the object itself
dies.


=head2 OBJECT EVENTS

Object events always relate to a specific object, which is always the
first argument. Not all events get generated for every object, some are
specific to an object type.

=head3 add_bonus (item creator difficulty max_magic flags)

A basic item has been created (e.g. for shops, monsters drops etc.)
that needs bonus values applied. The B<creator> object is a template
object that can be used to inherit stuff (and can be NULL). Flags is a
combination of GT_ENVIRONMENT (???) or GT_STARTEQUIP (set FLAG_STARTEQUIP
on item or set its value to 0) or GT_MINIMAL (???)

When overriden, built-in bonus generation is skipped, otherwise
treasure generation continues as it would without this hook.

In general, if flags != 0 or creator != 0 you should just return and leave
item generation to the standard code.

=head3 remove (object -- )

Invoked before the object is removed from its environment.

=head3 insert (object -- )

Called after the object was inserted into a container or map.

=head3 tick (object -- )

Invoked whenever the object "ticks", i.e. has positive B<speed_left>. Only
during ticks should an objetc process any movement or other events.

=head3 kill (object hitter -- )

Invoked whenever an object is dead and about to get removed. Overriding
processing will skip removal, but to do this successfully you have to
objetc from dieing, otherwise the event gets invoked again and again.

=head3 apply (object who -- applytype)

Invoked whenever the object is being applied in some way. The applytype is one of:

=over 4

=item B<0> player or monster can't apply objects of that type

=item B<1> has been applied, or there was an error applying the object

=item B<2> objects of that type can't be applied if not in inventory

=back

=head3 throw (object thrower)

Invoked when an B<object> is thrown by B<thrower>.

=head3 stop (object -- )

Invoked when a thrown B<object> (arrow, other stuff) hits something and is
thus being "stopped".

=head3 can_apply (who object -- reason)

=head3 can_be_applied (object who -- reason)

Check wether the B<object> can be applied/readied/etc. by the
object B<who> and return reason otherwise. Reason is a bitset composed of
C<CAN_APPLY_*>-flags.

=head3 be_ready (object who -- success)

=head3 ready (who object -- success)

Invoked whenever an B<object> is being applied by object B<who>. See
I<can_apply> for an alternative if you just want to check wether something
can apply an object.

=head3 be_unready (object who -- deleted)

=head3 unready (who object -- deleted)

Unwield/unapply/unready the given spell/weapon/skill/etc. B<object>,
currently applied by B<who>. If your override, make sure you give 'who'
(if it is a player) an indication of whats wrong. Must return true if the
object was freed.

=head3 use_skill (skill who part direction strignarg -- )

Invoked whenever a skill is used by somebody or something.

=head3 cast_spell (spell casting_object owner direction stringarg -- )

Invoked whenever a given spell is cast by B<casting_object> (used by
B<owner>).

=head3 drop (object who -- )

Invoked whenever an item gets dropped by somebody, e.g. as a result of a
drop command.

=head3 drop_on (floor object who -- )

Invoked whenever some B<object> is being dropped on the B<floor> object.

=head3 say (object player message)

Invoked whenever the I<object> can hear a B<message> being said by
B<player> in its vicinity.

=head3 monster_move (monster enemy -- )

Invoked whenever the B<monster> tries to move, just after B<enemy> and
other parameters have been determined, but before movement is actually
executed.

=head3 attack (object hitter -- damage)

Object gets attacked by somebody - when overriden, should return the
damage that has been dealt.

=head3 skill_attack (attacker victim message skill -- success)

Invoked whenever an B<attacker> attacks B<victim> using a B<skill> (skill
cna be C<undef>). B<message> is the message that describes the attack when
damage is done.

=head3 weapon_attack (weapon hitter victim)

Invoked whenever an object is used as a B<weapon> by B<hitter> to attack
B<victim>.

=head3 inscribe_note (book pl message skill -- )

Used whenever a book gets inscribed with a message.

=head3 trigger (object who -- )

Invoked whenever a lever-like B<object> has been activated/triggered in some
(manual) way.

=head3 move_trigger (object victim originator -- )

Invoked whenever a trap-like B<object> has been activated, usually by
moving onto it. This includes not just traps, but also buttons, holes,
signs and similar stuff.

=head3 close (container who -- )

Invoked whenever a container gets closed (this event is not yet reliable!).


=head2 GLOBAL EVENTS

Global events have no relation to specific objects.

=head3 cleanup ()

Called when the server is cleaning up, just before it calls exit.

=head3 clock ( )

Is invoked on every server tick, usually every 0.12 seconds.


=head2 PLAYER EVENTS

Player events always have a player object as first argument.

=head3 birth (player)

Invoked as very first thing after creating a player.

=head3 quit (player)

Invoked wheneever a player quits, before actually removing him/her.

=head3 kick (player params -- )

Invoked when the given plaer is being kicked, before the kick is executed.

=head3 load (player)

Invoked whenever a player has been loaded from disk, but before
actual login.

=head3 save (player)

Invoked just before a player gets saved.

=head3 login (player)

Invoked whenever a player logs in.

=head3 logout (player)

Invoked whenever a player logs out, gets disconnected etc.

=head3 death (player)

Invoked whenever a player dies, before the death actually gets processed.

=head3 map_change (player newmap x y -- )

Invoked before a player moves from one map to another, can override the movement.

=head3 command (player command args -- time)

Execute a user command send by the client. Programmable plug-ins usually
handle this event internally.

=head3 extcmd (player string)

Invoked whenever a client issues the C<extcmd> protocol command.
Programmable plug-ins usually handle this event internally.

=head3 move (player direction -- )

=head3 pray_altar (player altar skill -- )

Invoked whenever the B<player> prays over an B<altar>, using the given B<skill>.

=head3 tell (player name message -- )

Invoked whenever the player uses the B<tell> or B<reply> command, before
it gets processed.

=head3 say (player message --)

=head3 chat (player message --)

=head3 shout (player message --)

Invoked whenever the player uses the B<say>, B<chat> or B<shout> command,
before it gets processed.


=head2 MAP EVENTS

These events are generally dependent on a map and thus all have a map
as first argument.

=head3 instantiate (map)

Original B<map> has been loaded (e.g. on first use, or after a map
reset).

=head3 swapin (map)

Invoked when a previously swapped-out temporary B<map> has been loaded again.

=head3 swapout (map)

Invoked after a B<map> has been swapped out to disk.

=head3 reset (map)

Invoked when a B<map> gets reset.

=head3 clean (map)

Invoked when a temporary B<map> gets deleted on-disk.

=head3 enter (map player x y -- )

Invoked whenever a player tries to enter the B<map>, while he/she is still
on the old map. Overriding means the player won't be able to enter, and,
if newmap/x/y are given, will be redirected to that map instead.

=head3 leave (map player -- )

Invoked whenever a player tries to leave the B<map>. Overriding means the
player won't be able to leave.

=head3 trigger (map connection state -- )

Invoked whenever something activates a B<connection> on the B<map>. If B<state>
is true the connection was 'state' and if false it is 'released'.


=head2 CLIENT EVENTS

These events are very similar to player events, but they are might be
handled asynchronously as soon as the command reaches the server, even when
the player hasn't logged in yet (meaning there is no player yet).

=head3 connect (client -- )

Called as soon as a new connection to the server is established. Should
not be overriden.

=head3 addme (client -- )

The client sent an addme, thus ending the initial handshaking. If overriden, the server
will not send any response.

=head3 reply (client replystring -- )

Called when the client submits a reply in the ST_CUSTOM state. Usually
handled internally by language plugins.

=head3 exticmd (client string -- )

Like C<extcmd>, but can be called before a player has logged in.

Programmable plug-ins usually handle this event internally.

Revision:	1.12
Committed:	Mon Dec 25 11:25:49 2006 UTC (17 years, 5 months ago) by root
Branch:	MAIN
Changes since 1.11:	+32 -46 lines
Log Message:	- small, but subtle, rewrite of object management - perl will now keep attachable objects alive - objects are now refcounted - refcouts need to be tested explicitly (refcnt_chk) - explicit destroy is required current - explicit destroy asks "nicely" for the object to self destruct, if possible - refcounts will be used during mortal killing - minor bugfixes, optimisations etc. - some former hacks removed.
#	Content
1	=head1 CROSSFIRE+ PLUG-IN EVENTS
2
3	This document briefly describes each plug-in event. It is also used to
4	generate the event-list itself, so is always complete. Be careful wehn
5	changing it, though.
6
7	=head2 NOTATION
8
9	the event description below uses a variant of the forth stack notation -
10	an opening parenthesis followed by the type of each parameter, optionally
11	followed by two dashes and the returning parameters. If the latter is
12	missing, the event will be invoked but cannot change wether the event gets
13	processed.
14
15	If it is specified (even if no return values are supported), a plug-in
16	can override (e.g. using C<cf::override> in Perl) event processing,
17	basically short-circuiting it. For example, if you override from within a
18	player BIRTH event, nothing much will happen with respect to the built-in
19	processing, but if you override from within a player TELL event, the tell
20	will be ignored (presumably your plug-in took care of it).
21
22
23	=head2 ATTACHABLE EVENTS
24
25	No time to document this, screw me.
26
27	=head3 instantiate (object init-args...)
28
29	An object was instantiated.
30
31	For objects, this event occurs when a map is loaded for the first time
32	when it was instantiated from an archetype, or when the object was created
33	dynamically. The arguments are as specified in the C<attach> attribute of
34	the object or archetype.
35
36	This is useful to initialise any per-object state you might need.
37
38	=head3 reattach (object)
39
40	Invoked whenever attachments/plug-ins need to get reattached to the
41	object. This usually happens when it was loaded from disk, or when the
42	server was reloaded. This event will only be generated if the object has
43	attachments.
44
45	=head3 clone (object destination)
46
47	An object with _attached plugin_ is cloned, that is, a copy was made. The
48	copy automatically has all attachments the original object had. The perl
49	variables get copied in a shallow way (references are shared between
50	instances). If this is not the behaviour you need, you have to adjust the
51	B<destination> object as you see fit.
52
53	=head3 destroy (object -- )
54
55	Invoked when the crossfire object gets destroyed, and only when the object
56	has a handler for this event. This event can occur many times, as its
57	called when the in-memory object is destroyed, not when the object itself
58	dies.
59
60
61	=head2 OBJECT EVENTS
62
63	Object events always relate to a specific object, which is always the
64	first argument. Not all events get generated for every object, some are
65	specific to an object type.
66
67	=head3 add_bonus (item creator difficulty max_magic flags)
68
69	A basic item has been created (e.g. for shops, monsters drops etc.)
70	that needs bonus values applied. The B<creator> object is a template
71	object that can be used to inherit stuff (and can be NULL). Flags is a
72	combination of GT_ENVIRONMENT (???) or GT_STARTEQUIP (set FLAG_STARTEQUIP
73	on item or set its value to 0) or GT_MINIMAL (???)
74
75	When overriden, built-in bonus generation is skipped, otherwise
76	treasure generation continues as it would without this hook.
77
78	In general, if flags != 0 or creator != 0 you should just return and leave
79	item generation to the standard code.
80
81	=head3 remove (object -- )
82
83	Invoked before the object is removed from its environment.
84
85	=head3 insert (object -- )
86
87	Called after the object was inserted into a container or map.
88
89	=head3 tick (object -- )
90
91	Invoked whenever the object "ticks", i.e. has positive B<speed_left>. Only
92	during ticks should an objetc process any movement or other events.
93
94	=head3 kill (object hitter -- )
95
96	Invoked whenever an object is dead and about to get removed. Overriding
97	processing will skip removal, but to do this successfully you have to
98	objetc from dieing, otherwise the event gets invoked again and again.
99
100	=head3 apply (object who -- applytype)
101
102	Invoked whenever the object is being applied in some way. The applytype is one of:
103
104	=over 4
105
106	=item B<0> player or monster can't apply objects of that type
107
108	=item B<1> has been applied, or there was an error applying the object
109
110	=item B<2> objects of that type can't be applied if not in inventory
111
112	=back
113
114	=head3 throw (object thrower)
115
116	Invoked when an B<object> is thrown by B<thrower>.
117
118	=head3 stop (object -- )
119
120	Invoked when a thrown B<object> (arrow, other stuff) hits something and is
121	thus being "stopped".
122
123	=head3 can_apply (who object -- reason)
124
125	=head3 can_be_applied (object who -- reason)
126
127	Check wether the B<object> can be applied/readied/etc. by the
128	object B<who> and return reason otherwise. Reason is a bitset composed of
129	C<CAN_APPLY_*>-flags.
130
131	=head3 be_ready (object who -- success)
132
133	=head3 ready (who object -- success)
134
135	Invoked whenever an B<object> is being applied by object B<who>. See
136	I<can_apply> for an alternative if you just want to check wether something
137	can apply an object.
138
139	=head3 be_unready (object who -- deleted)
140
141	=head3 unready (who object -- deleted)
142
143	Unwield/unapply/unready the given spell/weapon/skill/etc. B<object>,
144	currently applied by B<who>. If your override, make sure you give 'who'
145	(if it is a player) an indication of whats wrong. Must return true if the
146	object was freed.
147
148	=head3 use_skill (skill who part direction strignarg -- )
149
150	Invoked whenever a skill is used by somebody or something.
151
152	=head3 cast_spell (spell casting_object owner direction stringarg -- )
153
154	Invoked whenever a given spell is cast by B<casting_object> (used by
155	B<owner>).
156
157	=head3 drop (object who -- )
158
159	Invoked whenever an item gets dropped by somebody, e.g. as a result of a
160	drop command.
161
162	=head3 drop_on (floor object who -- )
163
164	Invoked whenever some B<object> is being dropped on the B<floor> object.
165
166	=head3 say (object player message)
167
168	Invoked whenever the I<object> can hear a B<message> being said by
169	B<player> in its vicinity.
170
171	=head3 monster_move (monster enemy -- )
172
173	Invoked whenever the B<monster> tries to move, just after B<enemy> and
174	other parameters have been determined, but before movement is actually
175	executed.
176
177	=head3 attack (object hitter -- damage)
178
179	Object gets attacked by somebody - when overriden, should return the
180	damage that has been dealt.
181
182	=head3 skill_attack (attacker victim message skill -- success)
183
184	Invoked whenever an B<attacker> attacks B<victim> using a B<skill> (skill
185	cna be C<undef>). B<message> is the message that describes the attack when
186	damage is done.
187
188	=head3 weapon_attack (weapon hitter victim)
189
190	Invoked whenever an object is used as a B<weapon> by B<hitter> to attack
191	B<victim>.
192
193	=head3 inscribe_note (book pl message skill -- )
194
195	Used whenever a book gets inscribed with a message.
196
197	=head3 trigger (object who -- )
198
199	Invoked whenever a lever-like B<object> has been activated/triggered in some
200	(manual) way.
201
202	=head3 move_trigger (object victim originator -- )
203
204	Invoked whenever a trap-like B<object> has been activated, usually by
205	moving onto it. This includes not just traps, but also buttons, holes,
206	signs and similar stuff.
207
208	=head3 close (container who -- )
209
210	Invoked whenever a container gets closed (this event is not yet reliable!).
211
212
213	=head2 GLOBAL EVENTS
214
215	Global events have no relation to specific objects.
216
217	=head3 cleanup ()
218
219	Called when the server is cleaning up, just before it calls exit.
220
221	=head3 clock ( )
222
223	Is invoked on every server tick, usually every 0.12 seconds.
224
225
226	=head2 PLAYER EVENTS
227
228	Player events always have a player object as first argument.
229
230	=head3 birth (player)
231
232	Invoked as very first thing after creating a player.
233
234	=head3 quit (player)
235
236	Invoked wheneever a player quits, before actually removing him/her.
237
238	=head3 kick (player params -- )
239
240	Invoked when the given plaer is being kicked, before the kick is executed.
241
242	=head3 load (player)
243
244	Invoked whenever a player has been loaded from disk, but before
245	actual login.
246
247	=head3 save (player)
248
249	Invoked just before a player gets saved.
250
251	=head3 login (player)
252
253	Invoked whenever a player logs in.
254
255	=head3 logout (player)
256
257	Invoked whenever a player logs out, gets disconnected etc.
258
259	=head3 death (player)
260
261	Invoked whenever a player dies, before the death actually gets processed.
262
263	=head3 map_change (player newmap x y -- )
264
265	Invoked before a player moves from one map to another, can override the movement.
266
267	=head3 command (player command args -- time)
268
269	Execute a user command send by the client. Programmable plug-ins usually
270	handle this event internally.
271
272	=head3 extcmd (player string)
273
274	Invoked whenever a client issues the C<extcmd> protocol command.
275	Programmable plug-ins usually handle this event internally.
276
277	=head3 move (player direction -- )
278
279	=head3 pray_altar (player altar skill -- )
280
281	Invoked whenever the B<player> prays over an B<altar>, using the given B<skill>.
282
283	=head3 tell (player name message -- )
284
285	Invoked whenever the player uses the B<tell> or B<reply> command, before
286	it gets processed.
287
288	=head3 say (player message --)
289
290	=head3 chat (player message --)
291
292	=head3 shout (player message --)
293
294	Invoked whenever the player uses the B<say>, B<chat> or B<shout> command,
295	before it gets processed.
296
297
298	=head2 MAP EVENTS
299
300	These events are generally dependent on a map and thus all have a map
301	as first argument.
302
303	=head3 instantiate (map)
304
305	Original B<map> has been loaded (e.g. on first use, or after a map
306	reset).
307
308	=head3 swapin (map)
309
310	Invoked when a previously swapped-out temporary B<map> has been loaded again.
311
312	=head3 swapout (map)
313
314	Invoked after a B<map> has been swapped out to disk.
315
316	=head3 reset (map)
317
318	Invoked when a B<map> gets reset.
319
320	=head3 clean (map)
321
322	Invoked when a temporary B<map> gets deleted on-disk.
323
324	=head3 enter (map player x y -- )
325
326	Invoked whenever a player tries to enter the B<map>, while he/she is still
327	on the old map. Overriding means the player won't be able to enter, and,
328	if newmap/x/y are given, will be redirected to that map instead.
329
330	=head3 leave (map player -- )
331
332	Invoked whenever a player tries to leave the B<map>. Overriding means the
333	player won't be able to leave.
334
335	=head3 trigger (map connection state -- )
336
337	Invoked whenever something activates a B<connection> on the B<map>. If B<state>
338	is true the connection was 'state' and if false it is 'released'.
339
340
341	=head2 CLIENT EVENTS
342
343	These events are very similar to player events, but they are might be
344	handled asynchronously as soon as the command reaches the server, even when
345	the player hasn't logged in yet (meaning there is no player yet).
346
347	=head3 connect (client -- )
348
349	Called as soon as a new connection to the server is established. Should
350	not be overriden.
351
352	=head3 addme (client -- )
353
354	The client sent an addme, thus ending the initial handshaking. If overriden, the server
355	will not send any response.
356
357	=head3 reply (client replystring -- )
358
359	Called when the client submits a reply in the ST_CUSTOM state. Usually
360	handled internally by language plugins.
361
362	=head3 exticmd (client string -- )
363
364	Like C<extcmd>, but can be called before a player has logged in.
365
366	Programmable plug-ins usually handle this event internally.
367