Ports /tg/ & Paradise ghost sight.

Ghosts can now toggle darkness and seeing ghostly things independently.
Includes some extra work to allow observers to see AI eyes while (mostly) preventing cultists from doing the same.

code/modules/mob/dead/observer/login.dm

@@ -1,2 +1,5 @@
 /mob/dead/observer/Login()
-	..()
+	..()
+	if (ghostimage)
+		ghostimage.icon_state = src.icon_state
+	updateghostimages()

code/modules/mob/dead/observer/observer.dm

@@ -1,3 +1,6 @@
+var/global/list/image/ghost_darkness_images = list() //this is a list of images for things ghosts should still be able to see when they toggle darkness
+var/global/list/image/ghost_sightless_images = list() //this is a list of images for things ghosts should still be able to see even without ghost sight
+
 /mob/dead/observer
 	name = "ghost"
 	desc = "It's a g-g-g-g-ghooooost!" //jinkies!
@@ -23,15 +26,22 @@
 	var/atom/movable/following = null
 	var/admin_ghosted = 0
 	var/anonsay = 0
+	var/image/ghostimage = null //this mobs ghost image, for deleting and stuff
+	var/ghostvision = 1 //is the ghost able to see things humans can't?
+	var/seedarkness = 1
 
 /mob/dead/observer/New(mob/body)
 	sight |= SEE_TURFS | SEE_MOBS | SEE_OBJS | SEE_SELF
-	see_invisible = SEE_INVISIBLE_OBSERVER_AI_EYE
+	see_invisible = SEE_INVISIBLE_OBSERVER
 	see_in_dark = 100
 	verbs += /mob/dead/observer/proc/dead_tele
 
 	stat = DEAD
 
+	ghostimage = image(src.icon,src,src.icon_state)
+	ghost_darkness_images |= ghostimage
+	updateallghostimages()
+
 	var/turf/T
 	if(ismob(body))
 		T = get_turf(body)				//Where is the body located?
@@ -70,7 +80,13 @@
 	real_name = name
 	..()
 
-
+/mob/dead/observer/Del()
+	if (ghostimage)
+		ghost_darkness_images -= ghostimage
+		del(ghostimage)
+		ghostimage = null
+		updateallghostimages()
+	..()
 
 /mob/dead/observer/Topic(href, href_list)
 	if (href_list["track"])
@@ -403,22 +419,6 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 		src << "\blue Temperature: [round(environment.temperature-T0C,0.1)]&deg;C ([round(environment.temperature,0.1)]K)"
 		src << "\blue Heat Capacity: [round(environment.heat_capacity(),0.1)]"
 
-
-/mob/dead/observer/verb/toggle_sight()
-	set name = "Toggle Sight"
-	set category = "Ghost"
-
-	switch(see_invisible)
-		if(SEE_INVISIBLE_OBSERVER_AI_EYE)
-			see_invisible = SEE_INVISIBLE_OBSERVER_NOOBSERVERS
-			usr << "<span class='notice'>You no longer see other observers or the AI eye.</span>"
-		if(SEE_INVISIBLE_OBSERVER_NOOBSERVERS)
-			see_invisible = SEE_INVISIBLE_OBSERVER_NOLIGHTING
-			usr << "<span class='notice'>You no longer see darkness.</span>"
-		else
-			see_invisible = SEE_INVISIBLE_OBSERVER_AI_EYE
-			usr << "<span class='notice'>You again see everything.</span>"
-
 /mob/dead/observer/verb/become_mouse()
 	set name = "Become mouse"
 	set category = "Ghost"
@@ -620,3 +620,43 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 
 /mob/dead/observer/canface()
 	return 1
+
+/mob/dead/observer/verb/toggle_ghostsee()
+	set name = "Toggle Ghost Vision"
+	set desc = "Toggles your ability to see things only ghosts can see, like other ghosts"
+	set category = "Ghost"
+	ghostvision = !(ghostvision)
+	updateghostsight()
+	usr << "You [(ghostvision?"now":"no longer")] have ghost vision."
+
+/mob/dead/observer/verb/toggle_darkness()
+	set name = "Toggle Darkness"
+	set category = "Ghost"
+	seedarkness = !(seedarkness)
+	updateghostsight()
+
+/mob/dead/observer/proc/updateghostsight()
+	if (!seedarkness)
+		see_invisible = SEE_INVISIBLE_OBSERVER_NOLIGHTING
+	else
+		see_invisible = SEE_INVISIBLE_OBSERVER
+		if (!ghostvision)
+			see_invisible = SEE_INVISIBLE_LIVING;
+	updateghostimages()
+
+/proc/updateallghostimages()
+	for (var/mob/dead/observer/O in player_list)
+		O.updateghostimages()
+
+/mob/dead/observer/proc/updateghostimages()
+	if (!client)
+		return
+	if (seedarkness || !ghostvision)
+		client.images -= ghost_darkness_images
+		client.images |= ghost_sightless_images
+	else
+		//add images for the 60inv things ghosts can normally see when darkness is enabled so they can see them now
+		client.images -= ghost_sightless_images
+		client.images |= ghost_darkness_images
+		if (ghostimage)
+			client.images -= ghostimage //remove ourself

code/modules/mob/living/carbon/human/life.dm

@@ -324,7 +324,7 @@
 					if(istype(O)) O.add_autopsy_data("Radiation Poisoning", damage)
 
 	/** breathing **/
-	
+
 	handle_chemical_smoke(var/datum/gas_mixture/environment)
 		if(wear_mask && (wear_mask.flags & BLOCK_GAS_SMOKE_EFFECT))
 			return
@@ -1201,7 +1201,7 @@
 			if(seer==1)
 				var/obj/effect/rune/R = locate() in loc
 				if(R && R.word1 == cultwords["see"] && R.word2 == cultwords["hell"] && R.word3 == cultwords["join"])
-					see_invisible = SEE_INVISIBLE_OBSERVER
+					see_invisible = SEE_INVISIBLE_CULT
 				else
 					see_invisible = SEE_INVISIBLE_LIVING
 					seer = 0

code/modules/mob/living/silicon/ai/freelook/eye.dm

@@ -14,17 +14,34 @@
 	status_flags = GODMODE  // You can't damage it.
 	see_in_dark = 7
 	invisibility = INVISIBILITY_AI_EYE
+	var/ghostimage = null
+
+/mob/aiEye/New()
+	ghostimage = image(src.icon,src,src.icon_state)
+	ghost_darkness_images |= ghostimage //so ghosts can see the AI eye when they disable darkness
+	ghost_sightless_images |= ghostimage //so ghosts can see the AI eye when they disable ghost sight
+	updateallghostimages()
+	..()
+
+mob/aiEye/Del()
+	if (ghostimage)
+		ghost_darkness_images -= ghostimage
+		ghost_sightless_images -= ghostimage
+		del(ghostimage)
+		ghostimage = null;
+		updateallghostimages()
+	..()
 
 // Movement code. Returns 0 to stop air movement from moving it.
 /mob/aiEye/Move()
 	return 0
 
-/mob/aiEye/examinate(atom/A as mob|obj|turf in view())
+/mob/aiEye/examinate()
 	set popup_menu = 0
 	set src = usr.contents
 	return 0
 
-/mob/aiEye/pointed(atom/A as mob|obj|turf in view())
+/mob/aiEye/pointed()
 	set popup_menu = 0
 	set src = usr.contents
 	return 0