dead & killed flag separation

squashed 4 commits from #1297

library/LuaApi.cpp

@@ -1633,6 +1633,9 @@ static const LuaWrapper::FunctionReg dfhack_units_module[] = {
     WRAPM(Units, isGay),
     WRAPM(Units, isNaked),
     WRAPM(Units, isUndead),
+    WRAPM(Units, isGhost),
+    WRAPM(Units, isActive),
+    WRAPM(Units, isKilled),
     WRAPM(Units, isGelded),
     WRAPM(Units, isDomesticated),
     WRAPM(Units, getMainSocialActivity),

library/include/modules/Units.h

@@ -146,6 +146,9 @@ DFHACK_EXPORT bool isTrained(df::unit* unit);
 DFHACK_EXPORT bool isGay(df::unit* unit);
 DFHACK_EXPORT bool isNaked(df::unit* unit);
 DFHACK_EXPORT bool isUndead(df::unit* unit);
+DFHACK_EXPORT bool isGhost(df::unit *unit);
+DFHACK_EXPORT bool isActive(df::unit *unit);
+DFHACK_EXPORT bool isKilled(df::unit *unit);
 DFHACK_EXPORT bool isGelded(df::unit* unit);
 DFHACK_EXPORT bool isDomesticated(df::unit* unit);
 

library/modules/Units.cpp

@@ -388,7 +388,7 @@ bool Units::isDead(df::unit *unit)
 {
     CHECK_NULL_POINTER(unit);
 
-    return unit->flags1.bits.dead ||
+    return unit->flags2.bits.killed ||
            unit->flags3.bits.ghostly;
 }
 
@@ -396,7 +396,7 @@ bool Units::isAlive(df::unit *unit)
 {
     CHECK_NULL_POINTER(unit);
 
-    return !unit->flags1.bits.dead &&
+    return !unit->flags2.bits.killed &&
            !unit->flags3.bits.ghostly &&
            !unit->curse.add_tags1.bits.NOT_LIVING;
 }
@@ -1568,6 +1568,27 @@ bool Units::isUndead(df::unit* unit)
              && !unit->curse.add_tags1.bits.BLOODSUCKER ));
 }
 
+bool Units::isGhost(df::unit *unit)
+{
+    CHECK_NULL_POINTER(unit);
+
+    return !unit->flags3.bits.ghostly;
+}
+
+bool Units::isActive(df::unit *unit)
+{
+    CHECK_NULL_POINTER(unit);
+
+    return !unit->flags1.bits.dead;
+}
+
+bool Units::isKilled(df::unit *unit)
+{
+    CHECK_NULL_POINTER(unit);
+
+    return unit->flags2.bits.killed;
+}
+
 bool Units::isGelded(df::unit* unit)
 {
     CHECK_NULL_POINTER(unit);