Fix build failure when RSS limit is unset

Hugo's default for services.rss.limit is -1 (unlimited), and passing a
negative length to "first" aborts the build with "sequence length must
be non-negative". Every feed template did this unconditionally, so any
site that did not explicitly set services.rss.limit failed to build at
all, rather than degrading to an unlimited feed.

Only apply "first" when a positive limit is configured, which is the
same guard Hugo's own internal RSS template uses.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

6 files changed, 36 insertions, 6 deletions

diff --git a/layouts/home.atom.xml b/layouts/home.atom.xml
index c4f4eae..47b4233 100644
--- a/layouts/home.atom.xml
+++ b/layouts/home.atom.xml
@@ -18,6 +18,11 @@
   {{- end }}
 {{- end -}}
 
+{{- $pages := .Site.RegularPages }}
+{{- $limit := .Site.Config.Services.RSS.Limit }}
+{{- if ge $limit 1 }}
+{{- $pages = first $limit $pages }}
+{{- end -}}
 {{ "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" | safeHTML }}
 <feed xmlns="http://www.w3.org/2005/Atom">
     <id>{{ .Permalink }}</id>
@@ -33,7 +38,7 @@
     </author>{{ end }}
     <generator>Hugo -- gohugo.io</generator>
     <rights type="html">{{ replace .Site.Copyright "{currentYear}" (now.Format "2006") }}</rights>
-    <subtitle>{{ .Site.Params.Description }}</subtitle>{{ range first .Site.Config.Services.RSS.Limit .Site.RegularPages }}
+    <subtitle>{{ .Site.Params.Description }}</subtitle>{{ range $pages }}
     <entry>
         <id>{{ .Permalink }}</id>
         <title type="html">{{ .Title }}</title>
diff --git a/layouts/home.gemini_atom.xml b/layouts/home.gemini_atom.xml
index 6189f83..ac8f412 100644
--- a/layouts/home.gemini_atom.xml
+++ b/layouts/home.gemini_atom.xml
@@ -18,6 +18,11 @@
   {{- end }}
 {{- end -}}
 
+{{- $pages := .Site.RegularPages }}
+{{- $limit := .Site.Config.Services.RSS.Limit }}
+{{- if ge $limit 1 }}
+{{- $pages = first $limit $pages }}
+{{- end -}}
 {{ "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" | safeHTML }}
 <feed xmlns="http://www.w3.org/2005/Atom">
     <id>{{ .Permalink | strings.TrimSuffix "index.gmi" }}</id>
@@ -33,7 +38,7 @@
     </author>{{ end }}
     <generator>Hugo -- gohugo.io</generator>
     <rights type="html">{{ replace .Site.Copyright "{currentYear}" (now.Format "2006") }}</rights>
-    <subtitle>{{ .Site.Params.Description }}</subtitle>{{ range first .Site.Config.Services.RSS.Limit .Site.RegularPages }}
+    <subtitle>{{ .Site.Params.Description }}</subtitle>{{ range $pages }}
     <entry>
         <id>{{ .Permalink | strings.TrimSuffix "index.gmi" }}</id>
         <title>{{ .Title }}</title>
diff --git a/layouts/taxonomy.atom.xml b/layouts/taxonomy.atom.xml
index 1364f27..3b5a1ca 100644
--- a/layouts/taxonomy.atom.xml
+++ b/layouts/taxonomy.atom.xml
@@ -18,6 +18,11 @@
   {{- end }}
 {{- end -}}
 
+{{- $pages := .Data.Pages }}
+{{- $limit := .Site.Config.Services.RSS.Limit }}
+{{- if ge $limit 1 }}
+{{- $pages = first $limit $pages }}
+{{- end -}}
 {{ "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" | safeHTML }}
 <feed xmlns="http://www.w3.org/2005/Atom">
     <id>{{ .Permalink }}</id>
@@ -33,7 +38,7 @@
     </author>{{ end }}
     <generator>Hugo -- gohugo.io</generator>
     <rights type="html">{{ replace .Site.Copyright "{currentYear}" (now.Format "2006") }}</rights>
-    <subtitle>{{ .Site.Params.Description }}</subtitle>{{ range first .Site.Config.Services.RSS.Limit .Data.Pages }}
+    <subtitle>{{ .Site.Params.Description }}</subtitle>{{ range $pages }}
     <entry>
         <id>{{ .Permalink }}</id>
         <title type="html">{{ .Title }}</title>
diff --git a/layouts/taxonomy.gemini_atom.xml b/layouts/taxonomy.gemini_atom.xml
index d8ab06e..5341d32 100644
--- a/layouts/taxonomy.gemini_atom.xml
+++ b/layouts/taxonomy.gemini_atom.xml
@@ -18,6 +18,11 @@
   {{- end }}
 {{- end -}}
 
+{{- $pages := .Data.Pages }}
+{{- $limit := .Site.Config.Services.RSS.Limit }}
+{{- if ge $limit 1 }}
+{{- $pages = first $limit $pages }}
+{{- end -}}
 {{ "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" | safeHTML }}
 <feed xmlns="http://www.w3.org/2005/Atom">
     <id>{{ .Permalink | strings.TrimSuffix "index.gmi" }}</id>
@@ -33,7 +38,7 @@
     </author>{{ end }}
     <generator>Hugo -- gohugo.io</generator>
     <rights type="html">{{ replace .Site.Copyright "{currentYear}" (now.Format "2006") }}</rights>
-    <subtitle>{{ .Site.Params.Description }}</subtitle>{{ range first .Site.Config.Services.RSS.Limit .Data.Pages }}
+    <subtitle>{{ .Site.Params.Description }}</subtitle>{{ range $pages }}
     <entry>
         <id>{{ .Permalink | strings.TrimSuffix "index.gmi" }}</id>
         <title>{{ .Title }}</title>
diff --git a/layouts/term.atom.xml b/layouts/term.atom.xml
index 1364f27..3b5a1ca 100644
--- a/layouts/term.atom.xml
+++ b/layouts/term.atom.xml
@@ -18,6 +18,11 @@
   {{- end }}
 {{- end -}}
 
+{{- $pages := .Data.Pages }}
+{{- $limit := .Site.Config.Services.RSS.Limit }}
+{{- if ge $limit 1 }}
+{{- $pages = first $limit $pages }}
+{{- end -}}
 {{ "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" | safeHTML }}
 <feed xmlns="http://www.w3.org/2005/Atom">
     <id>{{ .Permalink }}</id>
@@ -33,7 +38,7 @@
     </author>{{ end }}
     <generator>Hugo -- gohugo.io</generator>
     <rights type="html">{{ replace .Site.Copyright "{currentYear}" (now.Format "2006") }}</rights>
-    <subtitle>{{ .Site.Params.Description }}</subtitle>{{ range first .Site.Config.Services.RSS.Limit .Data.Pages }}
+    <subtitle>{{ .Site.Params.Description }}</subtitle>{{ range $pages }}
     <entry>
         <id>{{ .Permalink }}</id>
         <title type="html">{{ .Title }}</title>
diff --git a/layouts/term.gemini_atom.xml b/layouts/term.gemini_atom.xml
index d8ab06e..5341d32 100644
--- a/layouts/term.gemini_atom.xml
+++ b/layouts/term.gemini_atom.xml
@@ -18,6 +18,11 @@
   {{- end }}
 {{- end -}}
 
+{{- $pages := .Data.Pages }}
+{{- $limit := .Site.Config.Services.RSS.Limit }}
+{{- if ge $limit 1 }}
+{{- $pages = first $limit $pages }}
+{{- end -}}
 {{ "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" | safeHTML }}
 <feed xmlns="http://www.w3.org/2005/Atom">
     <id>{{ .Permalink | strings.TrimSuffix "index.gmi" }}</id>
@@ -33,7 +38,7 @@
     </author>{{ end }}
     <generator>Hugo -- gohugo.io</generator>
     <rights type="html">{{ replace .Site.Copyright "{currentYear}" (now.Format "2006") }}</rights>
-    <subtitle>{{ .Site.Params.Description }}</subtitle>{{ range first .Site.Config.Services.RSS.Limit .Data.Pages }}
+    <subtitle>{{ .Site.Params.Description }}</subtitle>{{ range $pages }}
     <entry>
         <id>{{ .Permalink | strings.TrimSuffix "index.gmi" }}</id>
         <title>{{ .Title }}</title>