Use rel permalink as feed ID fallback

layouts/_default/list.atom.xml

@@ -118,7 +118,7 @@
     {{ range $subpage := $subpages }}
         <entry>
             {{ $content := .Content }}
-            {{ $id := "" }}
+            {{ $id := printf "tag:%s,%s:%s" (urls.Parse site.BaseURL).Host (.PublishDate.Format "2006-01-02") (cond (.Params.id | not) .RelPermalink .Params.id) }}
             {{ $paramlink := and .Params.link (not (.Param "paige.feed.link_to_page")) | not | not }}
             {{ $published := cond (not .PublishDate.IsZero) (.PublishDate.Format $format) "" }}
             {{ $rights := site.Copyright | markdownify }}
@@ -139,14 +139,6 @@
                 {{ $content = .Description | markdownify}}
             {{ end }}
 
-            {{ if .Params.id }}
-                {{ $id = printf "%s?id=%v" (urls.JoinPath site.BaseURL "/") .Params.id }}
-            {{ else if not .Date.IsZero }}
-                {{ $id = printf "tag:%s,%s:%s" (urls.Parse site.BaseURL).Host (.Date.Format "2006-01-02") (.Date.Format $format) }}
-            {{ else }}
-                {{ $id = .Permalink }}
-            {{ end }}
-
             {{ with index $ids $id }}
                 {{ warnf "layouts/_default/list.atom.xml: pages %s and %s have the same ID" . $subpage.RelPermalink }}
             {{ end }}

layouts/_default/list.rss.xml

@@ -74,9 +74,8 @@
                 {{ $author := "" }}
                 {{ $authors := partial "paige/authors.html" . }}
                 {{ $description := .Content }}
-                {{ $guid := "" }}
+                {{ $guid := printf "tag:%s,%s:%s" (urls.Parse site.BaseURL).Host (.PublishDate.Format "2006-01-02") (cond (.Params.id | not) .RelPermalink .Params.id) }}
                 {{ $paramlink := and .Params.link (not (.Param "paige.feed.link_to_page")) | not | not }}
-                {{ $permalink := false }}
                 {{ $pubdate := .PublishDate.Format $format }}
                 {{ $title := .Title | markdownify | plainify | htmlUnescape }}
 
@@ -110,15 +109,6 @@
                     {{ warnf "layouts/_default/rss.xml: page %s does not have a title or description" .RelPermalink }}
                 {{ end }}
 
-                {{ if .Params.id }}
-                    {{ $guid = .Params.id }}
-                {{ else if not .Date.IsZero }}
-                    {{ $guid = printf "tag:%s,%s:%s" (urls.Parse site.BaseURL).Host (.Date.Format "2006-01-02") (.Date.Format "2006-01-02T15:04:05Z07:00") }}
-                {{ else }}
-                    {{ $guid = .Permalink }}
-                    {{ $permalink = false }}
-                {{ end }}
-
                 {{ with index $guids $guid }}
                     {{ warnf "layouts/_default/rss.xml: pages %s and %s have the same GUID" . $subpage.RelPermalink }}
                 {{ end }}
@@ -133,7 +123,7 @@
                     <description>{{ printf "<![CDATA[%s]]>" . | safeHTML }}</description>
                 {{ end }}
 
-                <guid {{ if not $permalink }} isPermaLink="false" {{ end }}>{{ $guid }}</guid>
+                <guid isPermaLink="false">{{ $guid }}</guid>
 
                 {{ with $link }}
                     <link>{{ . }}</link>