app/themes/hugo-theme-stack/layouts/_default/rss.xml

{{- $pctx := . -}}
{{- if .IsHome -}}{{ $pctx = .Site }}{{- end -}}
{{- $pages := slice -}}
{{- if or $.IsHome $.IsSection -}}
{{- $pages = $pctx.RegularPages -}}
{{- else -}}
{{- $pages = $pctx.Pages -}}
{{- end -}}
{{- $pages := where $pages "Params.hidden" "!=" true -}}
{{- $limit := .Site.Config.Services.RSS.Limit -}}
{{- if ge $limit 1 -}}
{{- $pages = $pages | first $limit -}}
{{- end -}}
{{- printf "<?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"yes\"?>" | safeHTML }}
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
    <channel>
        <title>{{ if eq  .Title  .Site.Title }}{{ .Site.Title }}{{ else }}{{ with .Title }}{{.}} on {{ end }}{{ .Site.Title }}{{ end }}</title>
        <link>{{ .Permalink }}</link>
        <description>Recent content {{ if ne  .Title  .Site.Title }}{{ with .Title }}in {{.}} {{ end }}{{ end }}on {{ .Site.Title }}</description>
        <generator>Hugo -- gohugo.io</generator>{{ with .Site.LanguageCode }}
        <language>{{.}}</language>{{end}}{{ with .Site.Params.Author.email }}
        <managingEditor>{{.}}{{ with $.Site.Params.Author.name }} ({{.}}){{end}}</managingEditor>{{end}}{{ with .Site.Params.Author.email }}
        <webMaster>{{.}}{{ with $.Site.Params.Author.name }} ({{.}}){{end}}</webMaster>{{end}}{{ with .Site.Copyright }}
        <copyright>{{.}}</copyright>{{end}}{{ if not .Date.IsZero }}
        <lastBuildDate>{{ (index $pages.ByLastmod.Reverse 0).Lastmod.Format "Mon, 02 Jan 2006 15:04:05 -0700" | safeHTML }}</lastBuildDate>{{ end }}
        {{- with .OutputFormats.Get "RSS" -}}
        {{ printf "<atom:link href=%q rel=\"self\" type=%q />" .Permalink .MediaType | safeHTML }}
        {{- end -}}
        {{ range $pages }}
        {{- $content := safeHTML (.Summary | html) -}}
        {{- if .Site.Params.rssFullContent -}}
            {{- $content = safeHTML (.Content | html) -}}
        {{- end -}}
        <item>
        <title>{{ .Title }}</title>
        <link>{{ .Permalink }}</link>
        <pubDate>{{ .Date.Format "Mon, 02 Jan 2006 15:04:05 -0700" | safeHTML }}</pubDate>
        {{ with .Site.Params.Author.email }}<author>{{.}}{{ with $.Site.Params.Author.name }} ({{.}}){{end}}</author>{{end}}
        <guid>{{ .Permalink }}</guid>
        <description>
            {{- $image := partial "helper/image" (dict "Context" . "Type" "rss") -}}
            {{- if $image.exists -}}
                {{ "<" | html }}img src="{{ $image.permalink | absURL }}" alt="Featured image of post {{ .Title }}" {{ "/>" | html}}
            {{- end -}}{{ $content }}</description>
        </item>
        {{ end }}
    </channel>
</rss>