Remember price quotes that have been seen for types of item

These are displayed in discoveries, and a new 'price_quotes' option
allows them to be displayed for un-IDed objects in other contexts
too (the idea is that you turn on the option while identifying
objects and off for general play).

Invalidates existing save files.

include/extern.h

@@ -2860,6 +2860,8 @@ extern void bclose(int);
 /* setpaid() has a conditional code block near the end of the
    function, where arg1 is tested for NULL, preventing NONNULLARG1 */
 extern void setpaid(struct monst *) NO_NNARGS;
+extern void record_price_quote(int, unsigned long, boolean);
+extern void append_price_quote(char *, char **, int) NONNULLARG12;
 extern long money2mon(struct monst *, long) NONNULLARG1;
 extern void money2u(struct monst *, long) NONNULLARG1;
 extern void shkgone(struct monst *) NONNULLARG1;

include/flag.h

@@ -330,6 +330,7 @@ struct instance_flags {
     boolean num_pad;          /* use numbers for movement commands */
     boolean perm_invent;      /* display persistent inventory window */
     boolean perm_invent_pending;  /* need to try again */
+    boolean pricequotes;      /* display price quotes on unIDd objects */
     boolean renameallowed;    /* can change hero name during role selection */
     boolean renameinprogress; /* we are changing hero name */
     boolean sounds;           /* master on/off switch for using soundlib */

include/objclass.h

@@ -104,6 +104,11 @@ struct objclass {
 #define oc_level oc_oc2 /* books: spell level */
 
     unsigned short oc_nutrition; /* food value */
+
+    unsigned long oc_sell_minseen;
+    unsigned long oc_sell_maxseen;
+    unsigned long oc_buy_minseen;
+    unsigned long oc_buy_maxseen;
 };
 
 struct class_sym {

include/objects.h

@@ -44,7 +44,7 @@
 #define OBJECT(obj,bits,prp,sym,prob,dly,wt,        \
                cost,sdam,ldam,oc1,oc2,nut,color,sn) \
   { 0, 0, (char *) 0, bits, prp, sym, dly, color, prob, wt, \
-    cost, sdam, ldam, oc1, oc2, nut }
+    cost, sdam, ldam, oc1, oc2, nut, -1UL, 0, -1UL, 0 }
 #define MARKER(tag,sn) /*empty*/
 
 #elif defined(OBJECTS_ENUM)

include/optlist.h

@@ -589,6 +589,9 @@ static int optfn_##a(int, int, boolean, char *, char *);
     NHOPTB(preload_tiles, Advanced, 0, opt_out, set_in_config, /* MSDOS only */
            On, Yes, No, No, NoAlias, &iflags.wc_preload_tiles, Term_False,
            (char *)0)
+    NHOPTB(price_quotes, General, 0, opt_in, set_in_game,
+           Off, Yes, No, No, NoAlias, &iflags.pricequotes, Term_False,
+           "display prices you have seen for unidentified objects")
     NHOPTB(pushweapon, Behavior, 0, opt_in, set_in_game,
            Off, Yes, No, No, NoAlias, &flags.pushweapon, Term_False,
            "previous weapon goes to secondary slot")

include/patchlevel.h

@@ -17,7 +17,7 @@
  * Incrementing EDITLEVEL can be used to force invalidation of old bones
  * and save files.
  */
-#define EDITLEVEL 132
+#define EDITLEVEL 133
 
 /*
  * Development status possibilities.