eliminate plane.watchers feature

. we don't use them anywhere
. they have no tests
. they crash readgame when watchers have died

src/battle.c

@@ -228,21 +228,11 @@ static void message_faction(battle * b, faction * f, struct message *m)
 void message_all(battle * b, message * m)
 {
     bfaction *bf;
-    plane *p = rplane(b->region);
-    watcher *w;
 
     for (bf = b->factions; bf; bf = bf->next) {
         assert(bf->faction);
         message_faction(b, bf->faction, m);
     }
-    if (p)
-        for (w = p->watchers; w; w = w->next) {
-            for (bf = b->factions; bf; bf = bf->next)
-                if (bf->faction == w->faction)
-                    break;
-            if (bf == NULL)
-                message_faction(b, w->faction, m);
-        }
 }
 
 static void fbattlerecord(battle * b, faction * f, const char *s)

src/kernel/plane.c

@@ -290,14 +290,3 @@ int read_plane_reference(plane ** pp, struct storage *store)
         ur_add(id, pp, resolve_plane);
     return AT_READ_OK;
 }
-
-bool is_watcher(const struct plane * p, const struct faction * f)
-{
-    struct watcher *w;
-    if (!p)
-        return false;
-    w = p->watchers;
-    while (w && w->faction != f)
-        w = w->next;
-    return (w != NULL);
-}

src/kernel/plane.h

@@ -43,15 +43,8 @@ extern "C" {
 #define PFL_NOMONSTERS  16384   /* no monster randenc */
 #define PFL_SEESPECIAL  32768   /* far seeing */
 
-    typedef struct watcher {
-        struct watcher *next;
-        struct faction *faction;
-        unsigned char mode;
-    } watcher;
-
     typedef struct plane {
         struct plane *next;
-        struct watcher *watchers;
         int id;
         char *name;
         int minx, maxx, miny, maxy;
@@ -76,7 +69,6 @@ extern "C" {
     struct plane *get_homeplane(void);
     extern int rel_to_abs(const struct plane *pl, const struct faction *f,
         int rel, unsigned char index);
-    extern bool is_watcher(const struct plane *p, const struct faction *f);
     extern void write_plane_reference(const plane * p, struct storage *store);
     extern int read_plane_reference(plane ** pp, struct storage *store);
     extern int plane_width(const plane * pl);

src/kernel/save.c

@@ -1502,17 +1502,14 @@ int readgame(const char *filename, bool backup)
             }
         }
         else {
+            /* WATCHERS - eliminated in February 2016, ca. turn 966 */
+            if (gdata.version < CRYPT_VERSION) {
                 fno = read_faction_reference(&store);
                 while (fno.i) {
-                watcher *w = (watcher *)malloc(sizeof(watcher));
-                ur_add(fno, &w->faction, resolve_faction);
-                READ_INT(&store, &n);
-                w->mode = (unsigned char)n;
-                w->next = pl->watchers;
-                pl->watchers = w;
                     fno = read_faction_reference(&store);
                 }
             }
+        }
         a_read(&store, &pl->attribs, pl);
         if (pl->id != 1094969858) { // Regatta
             addlist(&planes, pl);
@@ -1791,7 +1788,6 @@ int writegame(const char *filename)
     WRITE_SECTION(&store);
 
     for (pl = planes; pl; pl = pl->next) {
-        watcher *w;
         WRITE_INT(&store, pl->id);
         WRITE_STR(&store, pl->name);
         WRITE_INT(&store, pl->minx);
@@ -1799,15 +1795,9 @@ int writegame(const char *filename)
         WRITE_INT(&store, pl->miny);
         WRITE_INT(&store, pl->maxy);
         WRITE_INT(&store, pl->flags);
-        w = pl->watchers;
-        while (w) {
-            if (w->faction) {
-                write_faction_reference(w->faction, &store);
-                WRITE_INT(&store, w->mode);
-            }
-            w = w->next;
-        }
-        write_faction_reference(NULL, &store);       /* mark the end of the list */
+#if RELEASE_VERSION < CRYPT_VERSION
+        write_faction_reference(NULL, &store);  /* mark the end of pl->watchers (gone since T966)  */
+#endif
         a_write(&store, pl->attribs, pl);
         WRITE_SECTION(&store);
     }

src/kernel/version.h

@@ -33,7 +33,7 @@
 #define SPELL_LEVEL_VERSION 348 /* f->max_spelllevel gets stored, not calculated */
 #define OWNER_3_VERSION 349 /* regions store last owner, not last alliance */
 #define ATTRIBOWNER_VERSION 350 /* all attrib_type functions know who owns the attribute */
-#define CRYPT_VERSION 351 /* passwords are encrypted */
+#define CRYPT_VERSION 351 /* passwords are encrypted (3.8.2), plane.watchers are gone (3.8.3) */
 #define RELEASE_VERSION CRYPT_VERSION /* current datafile */
 #define MIN_VERSION INTPAK_VERSION      /* minimal datafile we support */
 #define MAX_VERSION RELEASE_VERSION /* change this if we can need to read the future datafile, and we can do so */

src/reports.c

@@ -1385,17 +1385,9 @@ static void prepare_reports(void)
 
     for (r = regions; r; r = r->next) {
         unit *u;
-        plane *p = rplane(r);
 
         reorder_units(r);
 
-        if (p) {
-            watcher *w = p->watchers;
-            for (; w; w = w->next) {
-                faction_add_seen(w->faction, r, w->mode);
-            }
-        }
-
         /* Region owner get always the Lighthouse report */
         if (bt_lighthouse && config_token("rules.region_owner_pay_building", bt_lighthouse->_name)) {
             for (b = rbuildings(r); b; b = b->next) {
@@ -1464,8 +1456,6 @@ static region *lastregion(faction * f)
 
     /* we continue from the best region and look for travelthru etc. */
     for (r = f->last->next; r; r = r->next) {
-        plane *p = rplane(r);
-
         /* search the region for travelthru-attributes: */
         if (fval(r, RF_TRAVELUNIT)) {
             travelthru_map(r, cb_set_last, f);
@@ -1474,9 +1464,6 @@ static region *lastregion(faction * f)
             continue;
         if (check_leuchtturm(r, f))
             f->last = r;
-        if (p && is_watcher(p, f)) {
-            f->last = r;
-        }
     }
     return f->last->next;
 #else