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divine gift of spell knowledge

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Remove the conduct-specific aspect of receiving spells as prayer boon.
Anyone now has a 25% chance of having the spell directly implanted
into their head, not just characters who have maintained illiterate
conduct.  It can now also restore a forgotten spell or refresh one
that is nearly forgotten.  It still tries to choose a spell which
isn't already known (new: or was known but has been forgotten) but if
it picks one that is known and doesn't need refreshing, a redundant
book will be given, same as the behavior in earlier versions.

The chance for receiving a blank spellbook is higher when that item
is undiscovered.  When given as a prayer reward, make it become
discovered even if hero doesn't read it so that it will be less likely
to be given again.  There's a 1% chance for that auto-discovery to
happen with other bestowed books.  Unlike blank boots, having the book
be discovered doesn't lessen their chance of being repeat gifts.

Minor bug fix:  for a spell implanted from scratch, the book remains
unknown.  That's ok; it's actually more interesting than discovering
a book you haven't seen yet.  But after acquiring and reading the book
you could get "you know <spell> quite well already" and the book would
stay undiscovered even though you were just told what spell it's for.
This commit is contained in:
PatR
2022-03-09 07:06:37 -08:00
parent 0effaf529a
commit e3490743e0
6 changed files with 151 additions and 75 deletions
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6
include/extern.h
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@@ -1,4 +1,4 @@
/* NetHack 3.7 extern.h $NHDT-Date: 1646255373 2022/03/02 21:09:33 $ $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.1064 $ */
/* NetHack 3.7 extern.h $NHDT-Date: 1646838387 2022/03/09 15:06:27 $ $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.1068 $ */
/* Copyright (c) Steve Creps, 1988. */
/* NetHack may be freely redistributed. See license for details. */
@@ -2543,9 +2543,9 @@ extern int tport_spell(int);
extern void losespells(void);
extern int dovspell(void);
extern void initialspell(struct obj *);
extern boolean known_spell(short);
extern int known_spell(short);
extern int spell_idx(short);
extern boolean force_learn_spell(short);
extern char force_learn_spell(short);
extern int num_spells(void);
/* ### steal.c ### */

9
include/spell.h
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@@ -1,4 +1,4 @@
/* NetHack 3.7 spell.h $NHDT-Date: 1596498560 2020/08/03 23:49:20 $ $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.11 $ */
/* NetHack 3.7 spell.h $NHDT-Date: 1646838388 2022/03/09 15:06:28 $ $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.14 $ */
/* Copyright 1986, M. Stephenson */
/* NetHack may be freely redistributed. See license for details. */
@@ -17,6 +17,13 @@ struct spell {
int sp_know; /* knowlege of spell */
};
enum spellknowledge {
spe_Forgotten = -1, /* known but no longer castable */
spe_Unknown = 0, /* not yet known */
spe_Fresh = 1, /* castable if various casting criteria are met */
spe_GoingStale = 2 /* still castable but nearly forgotten */
};
/* levels of memory destruction with a scroll of amnesia */
#define ALL_MAP 0x1
#define ALL_SPELLS 0x2