From 8155b00fce18d377077ce16063aacb95e6666b3e Mon Sep 17 00:00:00 2001
From: rebel228 <58699696+rebel228@users.noreply.github.com>
Date: Tue, 26 May 2020 08:42:11 +0300
Subject: [PATCH] Library computer fix (#13486)

fixes library computer printing wrong manuals
fixes a bug with an empty interface button in "print manual" section
---
 code/modules/library/computers/checkout.dm | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/code/modules/library/computers/checkout.dm b/code/modules/library/computers/checkout.dm
index 99f7e2cb8fe..31eebc5d05c 100644
--- a/code/modules/library/computers/checkout.dm
+++ b/code/modules/library/computers/checkout.dm
@@ -165,7 +165,7 @@
 			dat += "<table>"
 
 			var/list/forbidden = list(
-				/obj/item/book/manual
+				/obj/item/book/manual/random
 			)
 
 			if(!emagged)
@@ -174,11 +174,12 @@
 			var/manualcount = 1
 			var/obj/item/book/manual/M = null
 
-			for(var/manual_type in (typesof(/obj/item/book/manual) - forbidden))
-				M = new manual_type()
-				dat += "<tr><td><A href='?src=[UID()];manual=[manualcount]'>[M.title]</A></td></tr>"
+			for(var/manual_type in subtypesof(/obj/item/book/manual))
+				if(!(manual_type in forbidden))
+					M = new manual_type()
+					dat += "<tr><td><A href='?src=[UID()];manual=[manualcount]'>[M.title]</A></td></tr>"
+					QDEL_NULL(M)
 				manualcount++
-				QDEL_NULL(M)
 			dat += "</table>"
 			dat += "<BR><A href='?src=[UID()];switchscreen=0'>(Return to main menu)</A><BR>"