Properly display fractured altars in dungeon overview.

Should have done this before making version 0.9.0 available for public
play, as this commit is save-breaking. Better late than never.

Author: k21971

doc/evilhack-changelog.md

@@ -4376,4 +4376,5 @@ The following changes to date are:
 - Latest merges from 'vanilla' NetHack 3.6.7 official release (as of
   November 6th, 2024)
 - Initial preparation for new version (0.9.1)
+- Properly display fractured altars in dungeon overview
 

include/dungeon.h

@@ -227,6 +227,7 @@ typedef struct mapseen {
         Bitfield(nfount, 2);
         Bitfield(nsink, 2);
         Bitfield(naltar, 2);
+        Bitfield(nfaltar, 2);
         Bitfield(nthrone, 2);
 
         Bitfield(ngrave, 2);

src/dungeon.c

@@ -2403,9 +2403,9 @@ d_level *lev;
 
 #define INTEREST(feat)                                                  \
     ((feat).nfount || (feat).nsink || (feat).nthrone || (feat).naltar   \
-     || (feat).ngrave || (feat).ntree || (feat).nshop || (feat).ntemple \
-     || (feat).nforge || (feat).ndeadtree || (feat).ngrass              \
-     || (feat).nsand  || (feat).nmagicchest)
+     || (feat).nfaltar || (feat).ngrave || (feat).ntree || (feat).nshop \
+     || (feat).ntemple || (feat).nforge || (feat).ndeadtree             \
+     || (feat).ngrass || (feat).nsand  || (feat).nmagicchest)
   /* || (feat).water || (feat).ice || (feat).lava */
 
 /* returns true if this level has something interesting to print out */
@@ -2651,13 +2651,23 @@ recalc_mapseen()
                         && (levl[x][y].seenv & SVALL) != SVALL)
                          ? MSA_NONE
                          : Amask2msa(levl[x][y].altarmask);
-                if (!mptr->feat.naltar)
-                    mptr->feat.msalign = atmp;
-                else if (mptr->feat.msalign != atmp)
-                    mptr->feat.msalign = MSA_NONE;
-                count = mptr->feat.naltar + 1;
-                if (count <= 3)
-                    mptr->feat.naltar = count;
+                if (levl[x][y].frac_altar == 1) {
+                    if (!mptr->feat.nfaltar)
+                        mptr->feat.msalign = atmp;
+                    else if (mptr->feat.msalign != atmp)
+                        mptr->feat.msalign = MSA_NONE;
+                    count = mptr->feat.nfaltar + 1;
+                    if (count <= 3)
+                        mptr->feat.nfaltar = count;
+                } else {
+                    if (!mptr->feat.naltar)
+                        mptr->feat.msalign = atmp;
+                    else if (mptr->feat.msalign != atmp)
+                        mptr->feat.msalign = MSA_NONE;
+                    count = mptr->feat.naltar + 1;
+                    if (count <= 3)
+                        mptr->feat.naltar = count;
+                }
                 break;
             /*  An automatic annotation is added to the Castle and
              *  to Fort Ludios once their structure's main entrance
@@ -3078,6 +3088,17 @@ boolean printdun;
                 && (u.ualign.type != A_NONE || mptr->feat.naltar == 1))
                 Sprintf(eos(buf), " to %s", align_gname(u.ualign.type));
         }
+        if (mptr->feat.nfaltar > 0) {
+            /* same for fractured altars */
+            if (mptr->feat.ntemple != mptr->feat.nfaltar)
+                ADDNTOBUF("fractured altar", mptr->feat.nfaltar);
+            else
+                ADDNTOBUF("temple", mptr->feat.ntemple);
+
+            if (Amask2align(Msa2amask(mptr->feat.msalign)) == u.ualign.type
+                && (u.ualign.type != A_NONE || mptr->feat.nfaltar == 1))
+                Sprintf(eos(buf), " to %s", align_gname(u.ualign.type));
+        }
         ADDNTOBUF("throne", mptr->feat.nthrone);
         ADDNTOBUF("forge", mptr->feat.nforge);
         ADDNTOBUF("magic chest", mptr->feat.nmagicchest);