viewing geno'd monsters at "genocide what?" prompt

At either of the genocide prompts,
|What type of monster do you want to genocide?
or
|What class of monsters do you want to genocide?
answering "?<return>" will show the list of monster types that have
already been genocided, then re-prompt.

doc/fixes3-7-0.txt

@@ -2234,6 +2234,9 @@ new status highlight rule type for hitpoints:  "criticalhp" rule overrides
 	hit point rules if current HP is so low that prayer will consider it
 	to be major problem; applies to hitpointbar as well as HP status
 high skill level in martial arts or bare-handed combat sometimes hits twice
+answering '?<return>' at the "genocide what?" prompt (for either monster class
+	or single species) runs the #genocided command to show what types of
+	monsters have already been genocided and then re-prompts
 
 
 Platform- and/or Interface-Specific New Features

src/insight.c

@@ -2882,14 +2882,18 @@ list_genocided(char defquery, boolean ask)
     char c;
     winid klwin;
     char buf[BUFSZ];
-    boolean dumping; /* for DUMPLOG; doesn't need to be conditional */
+    boolean genoing, /* prompting for genocide or class genocide */
+            dumping; /* for DUMPLOG; doesn't need to be conditional */
     boolean both = (gp.program_state.gameover || wizard || discover);
 
     dumping = (defquery == 'd');
-    if (dumping)
+    genoing = (defquery == 'g');
+    if (dumping || genoing)
         defquery = 'y';
+    if (genoing)
+        both = FALSE; /* genocides only, not extinctions */
 
-    /* this goess through the whole monster list up to three times but will
+    /* this goes through the whole monster list up to three times but will
        happen rarely and is simpler than a more general single pass check;
        extinctions are only revealed during end of game disclosure or when
        running in wizard or explore mode */
@@ -2985,7 +2989,7 @@ list_genocided(char defquery, boolean ask)
     } else if (!gp.program_state.gameover) {
         /* #genocided rather than final disclosure, so pline() is ok and
            extinction has been ignored */
-        pline("No creatures have been genocided.");
+        pline("No creatures have been genocided%s.", genoing ? " yet" : "");
 #ifdef DUMPLOG
     } else if (dumping) { /* 'gameover' is True if we make it here */
         putstr(0, 0, "No species were genocided or became extinct.");

src/read.c

@@ -2506,15 +2506,18 @@ do_class_genocide(void)
     boolean gameover = FALSE; /* true iff killed self */
 
     buf[0] = '\0'; /* for EDIT_GETLIN */
-    for (j = 0;; j++) {
+    for (j = 0; ; j++) {
         if (j >= 5) {
             pline1(thats_enough_tries);
             return;
         }
         Strcpy(promptbuf, "What class of monsters do you want to genocide?");
-        if (iflags.cmdassist && j > 0)
-            Strcat(promptbuf,
-                   " [enter the symbol or name representing a class]");
+        if (j > 0)
+            Snprintf(eos(promptbuf), sizeof promptbuf - strlen(promptbuf),
+                     " [enter %s]",
+                     iflags.cmdassist
+                       ? "the symbol or name representing a class, or '?'"
+                       : "'?' to see previous genocides");
         getlin(promptbuf, buf);
         (void) mungspaces(buf);
         /* avoid 'that does not represent any monster' for empty input */
@@ -2534,6 +2537,13 @@ do_class_genocide(void)
                            "declined to perform class genocide");
             return;
         }
+        /* "?" runs #genocided to show existing genocides, then re-prompts;
+           accept "'?'" too because the prompt's hint shows it that way */
+        if (!strcmp(buf, "?") || !strcmp(buf, "'?'")) {
+            list_genocided('g', FALSE);
+            --j; /* don't count this iteration as one of the tries */
+            continue;
+        }
 
         class = name_to_monclass(buf, (int *) 0);
         if (class == 0 && (i = name_to_mon(buf, (int *) 0)) != NON_PM)
@@ -2705,8 +2715,12 @@ do_genocide(
                 return;
             }
             Strcpy(promptbuf, "What type of monster do you want to genocide?");
-            if (iflags.cmdassist && i > 0)
-                Strcat(promptbuf, " [enter the name of a type of monster]");
+            if (i > 0)
+                Snprintf(eos(promptbuf), sizeof promptbuf - strlen(promptbuf),
+                         " [enter %s]",
+                         iflags.cmdassist
+                           ? "the name of a type of monster, or '?'"
+                           : "'?' to see previous genocides");
             getlin(promptbuf, buf);
             (void) mungspaces(buf);
             /* avoid 'such creatures do not exist' for empty input */
@@ -2728,6 +2742,12 @@ do_genocide(
                 livelog_printf(LL_GENOCIDE, "declined to perform genocide");
                 return;
             }
+            /* "?" or "'?'" runs #genocided to show existing genocides */
+            if (!strcmp(buf, "?") || !strcmp(buf, "'?'")) {
+                list_genocided('g', FALSE);
+                --i; /* don't count this iteration as one of the tries */
+                continue;
+            }
 
             mndx = name_to_mon(buf, (int *) 0);
             if (mndx == NON_PM || (gm.mvitals[mndx].mvflags & G_GENOD)) {