# HG changeset patch
# User Kim Alvefur <zash@zash.se>
# Date 1720703069 -7200
# Node ID 1f93e4f78c53218e23a2468dc91f25b6be1911d6
# Parent  aefbc76ac8d2192829db28059c1bcafe308f6c01
util.xtemplate: Fix error on applying each() to zero stanzas

diff -r aefbc76ac8d2 -r 1f93e4f78c53 spec/util_xtemplate_spec.lua
--- a/spec/util_xtemplate_spec.lua	Sun Jul 07 18:40:25 2024 +0200
+++ b/spec/util_xtemplate_spec.lua	Thu Jul 11 15:04:29 2024 +0200
@@ -38,6 +38,10 @@
 				x:reset();
 				assert.same("12345", xtemplate.render("{foo/bar|each(i){{#}}}", x));
 			end)
+			it("handles missing inputs", function ()
+				local x = st.stanza("root");
+				assert.same("", xtemplate.render("{foo/bar|each(i){{#}}}", x));
+			end)
 		end)
 	end)
 end)
diff -r aefbc76ac8d2 -r 1f93e4f78c53 teal-src/prosody/util/xtemplate.tl
--- a/teal-src/prosody/util/xtemplate.tl	Sun Jul 07 18:40:25 2024 +0200
+++ b/teal-src/prosody/util/xtemplate.tl	Thu Jul 11 15:04:29 2024 +0200
@@ -54,7 +54,10 @@
 			if tmpl then tmpl = s_sub(tmpl, 2, -2); end
 			if args then args = s_sub(args, 2, -2); end
 
-			if func == "each" and tmpl and st.is_stanza(value) then
+			if func == "each" and tmpl then
+				if not st.is_stanza(value) then
+					return pre_blank..post_blank;
+				end
 				if not args then value, args = root, path; end
 				local ns, name = s_match(args, "^(%b{})(.*)$");
 				if ns then ns = s_sub(ns, 2, -2); else name, ns = args, nil; end
diff -r aefbc76ac8d2 -r 1f93e4f78c53 util/xtemplate.lua
--- a/util/xtemplate.lua	Sun Jul 07 18:40:25 2024 +0200
+++ b/util/xtemplate.lua	Thu Jul 11 15:04:29 2024 +0200
@@ -39,7 +39,8 @@
 			if tmpl then tmpl = s_sub(tmpl, 2, -2); end
 			if args then args = s_sub(args, 2, -2); end
 
-			if func == "each" and tmpl and st.is_stanza(value) then
+			if func == "each" and tmpl then
+				if not st.is_stanza(value) then return pre_blank .. post_blank end
 				if not args then value, args = root, path; end
 				local ns, name = s_match(args, "^(%b{})(.*)$");
 				if ns then