First version of replacing hugo-atom-feed (issue #714)

.gitignore

@@ -11,3 +11,7 @@ public
 .*.swp
 
 .DS_Store
+
+__pycache__
+__pycache__/
+*.py[cod]

config.yaml

@@ -1,7 +1,5 @@
 disableKinds:
   - taxonomy
-theme:
-  - scientific-python-hugo-theme/themes/hugo-atom-feed
 params:
   colorScheme: auto # can be auto (browser setting), light, or dark
   images:
@@ -11,3 +9,14 @@ params:
   plausible:
     dataDomain: null
     javaScript: "https://views.scientific-python.org/js/script.js"
+
+mediaTypes:
+  application/atom+xml:
+    suffixes:
+      - xml
+
+outputFormats:
+  atom:
+    baseName: atom
+    mediaType: application/atom+xml
+    noUgly: true

layouts/_default/baseof.html

@@ -6,6 +6,9 @@
     {{ with .Params.canonicalURL -}}
     <link rel="canonical" href="{{ . }}">
     {{- end }}
+    {{- range .AlternativeOutputFormats }}
+    <link rel="{{ .Rel }}" type="{{ .MediaType.Type }}" href="{{ .Permalink }}">
+    {{- end }}
     <title>{{ block "title" . }}{{ .Site.Title }}{{ if not (eq .Site.Title .Title) }} - {{ .Title }}{{end}}{{ end }}</title>
 
     <!-- Render theme css -->

layouts/list.atom.xml

@@ -0,0 +1,47 @@
+{{ printf `<?xml version="1.0" encoding="utf-8"?>` | safeHTML }}
+<feed xmlns="http://www.w3.org/2005/Atom" {{- with site.Language.Locale }} xml:lang="{{ . }}"{{ end }}>
+    <generator uri="https://gohugo.io/" version="{{ hugo.Version }}">Hugo</generator>
+    <title>{{ .Title }}</title>
+    {{- with site.Params.description }}
+    <subtitle>{{ . }}</subtitle>
+    {{- end }}
+    <id>{{ .Permalink }}</id>
+    {{- $entries := .RegularPagesRecursive.ByDate.Reverse -}}
+    {{- $limit := site.Config.Services.RSS.Limit -}}
+    {{- if ge $limit 1 -}}
+        {{- $entries = first $limit $entries -}}
+    {{- end -}}
+    {{- $updated := .Lastmod -}}
+    {{- with $entries.ByLastmod.Reverse -}}
+        {{- $updated = (index . 0).Lastmod -}}
+    {{- end }}
+    <updated>{{ $updated.Format "2006-01-02T15:04:05Z07:00" }}</updated>
+    <author>
+        <name>{{ site.Params.author.name | default site.Title }}</name>
+    {{- with site.Params.author.email }}
+        <email>{{ . }}</email>
+    {{- end }}
+    </author>
+    {{- with .OutputFormats.Get "atom" }}
+    <link rel="self" href="{{ .Permalink }}" type="{{ .MediaType.Type }}" />
+    {{- end }}
+    {{- with .OutputFormats.Get "html" }}
+    <link rel="alternate" href="{{ .Permalink }}" type="{{ .MediaType.Type }}" />
+    {{- end }}
+
+    {{- range $entries }}
+    <entry>
+      <title>{{ .Title }}</title>
+      <id>{{ .Permalink }}</id>
+      <updated>{{ .Lastmod.Format "2006-01-02T15:04:05Z07:00" }}</updated>
+      <published>{{ .Date.Format "2006-01-02T15:04:05Z07:00" }}</published>
+      {{- with .OutputFormats.Get "html" }}
+      <link rel="alternate" href="{{ .Permalink }}" type="{{ .MediaType.Type }}" />
+      {{- end }}
+      <content type="html" xml:base="{{ .Permalink }}">{{ printf "%s" .Content }}</content>
+      {{- range .GetTerms "tags" }}
+      <category term="{{ .LinkTitle }}" scheme="{{ site.Home.Permalink }}tags/" label="{{ .LinkTitle }}" />
+      {{- end }}
+    </entry>
+    {{- end }}
+</feed>