slayrace: add single-creature targetting, add magma column mode

README.rst

@@ -1401,18 +1401,30 @@ Kills any unit of a given race.
 
 With no argument, lists the available races.
 
+With the special argument 'him', targets only the selected creature.
+
 Any non-dead non-caged unit of the specified race gets its ``blood_count``
-set to 0, which means immediate death at the next game tick. May not work
-on vampires and other weird creatures.
+set to 0, which means immediate death at the next game tick. For creatures
+such as vampires, also set animal.vanish_countdown to 2.
+
+An alternate mode is selected by adding a 2nd argument to the command,
+``magma``. In this case, a column of 7/7 magma is generated on top of the
+targets until they die (Warning: do not call on magma-safe creatures. Also,
+using this mode for birds is not recommanded.)
+
+Will target any unit on a revealed tile of the map, including ambushers.
 
-Targets any unit on a revealed tile of the map, including ambushers. Ex:
+Ex:
 :: 
     slayrace gob
 
-To kill a single creature in the same way, you can use the following line,
-after selecting the unit with the 'v' cursor:
+To kill a single creature, select the unit with the 'v' cursor and:
+:: 
+    slayrace him
+
+To purify all elves on the map with fire (may have side-effects):
 :: 
-    rb_eval df.unit_find.body.blood_count = 0
+    slayrace elve magma
 
 
 magmasource

scripts/slayrace.rb

@@ -1,6 +1,9 @@
 # slay all creatures of a given race
 
+# race = name of the race to eradicate, use 'him' to target only the selected creature
 race = $script_args[0]
+# if the 2nd parameter is 'magma', magma rain for the targets instead of instant death
+magma = ($script_args[1] == 'magma')
 
 checkunit = lambda { |u|
 	u.body.blood_count != 0 and
@@ -9,12 +12,39 @@ checkunit = lambda { |u|
 	not df.map_designation_at(u).hidden
 }
 
+slayit = lambda { |u|
+	if not magma
+		# just make them drop dead
+		u.body.blood_count = 0
+		# some races dont mind having no blood, ensure they are still taken care of.
+		u.animal.vanish_countdown = 2
+	else
+		# it's getting hot around here
+		# !!WARNING!! do not call on a magma-safe creature
+		ouh = df.onupdate_register(1) {
+			if u.flags1.dead
+				df.onupdate_unregister(ouh)
+			else
+				x, y, z = u.pos.x, u.pos.y, u.pos.z
+				z += 1 while tile = df.map_tile_at(x, y, z+1) and tile.shape_passableflow
+				df.map_tile_at(x, y, z).spawn_magma(7)
+			end
+		}
+	end
+}
+
 all_races = df.world.units.active.map { |u|
 	u.race_tg.creature_id if checkunit[u]
 }.compact.uniq.sort
 
 if !race
 	puts all_races
+elsif race == 'him'
+	if him = df.unit_find
+		slayit[him]
+	else
+		puts "Choose target"
+	end
 else
 	raw_race = df.match_rawname(race, all_races)
 	raise 'invalid race' if not raw_race
@@ -24,7 +54,7 @@ else
 	count = 0
 	df.world.units.active.each { |u|
 		if u.race == race_nr and checkunit[u]
-			u.body.blood_count = 0
+			slayit[u]
 			count += 1
 		end
 	}