From 5b5a0438682ecb69bbc8d7cb9904ad4b049033a3 Mon Sep 17 00:00:00 2001
From: Brian Picciano <mediocregopher@gmail.com>
Date: Sun, 22 Jan 2023 12:45:03 +0100
Subject: Implement gemini atom feed

---
 src/gmi/tpl.go              | 104 +++++++++++++++++++++++++++-----------------
 src/gmi/tpl/feed.xml        |  28 ++++++++++++
 src/gmi/tpl/posts/index.gmi |   2 +-
 3 files changed, 94 insertions(+), 40 deletions(-)
 create mode 100644 src/gmi/tpl/feed.xml

(limited to 'src/gmi')

diff --git a/src/gmi/tpl.go b/src/gmi/tpl.go
index c648abd..edd3a75 100644
--- a/src/gmi/tpl.go
+++ b/src/gmi/tpl.go
@@ -35,10 +35,9 @@ type rendererGetPostSeriesNextPreviousRes struct {
 }
 
 type renderer struct {
-	url           *url.URL
-	postStore     post.Store
-	gmiPublicURL  *url.URL
-	httpPublicURL *url.URL
+	url             *url.URL
+	postStore       post.Store
+	preprocessFuncs post.PreprocessFunctions
 }
 
 func (r renderer) GetPosts(page, count int) (rendererGetPostsRes, error) {
@@ -91,39 +90,9 @@ func (r renderer) GetPostSeriesNextPrevious(p post.StoredPost) (rendererGetPostS
 
 func (r renderer) PostBody(p post.StoredPost) (string, error) {
 
-	preprocessFuncs := post.PreprocessFunctions{
-		BlogURL: func(path string) string {
-			return filepath.Join("/", r.gmiPublicURL.Path, path)
-		},
-		AssetURL: func(id string) string {
-			return filepath.Join("/assets", id)
-		},
-		PostURL: func(id string) string {
-			return filepath.Join("/posts", id)
-		},
-		StaticURL: func(path string) string {
-			httpPublicURL := *r.httpPublicURL
-			httpPublicURL.Path = filepath.Join(httpPublicURL.Path, "/static", path)
-			return httpPublicURL.String()
-		},
-		Image: func(args ...string) (string, error) {
-
-			var (
-				id    = args[0]
-				descr = "Image"
-			)
-
-			if len(args) > 1 {
-				descr = args[1]
-			}
-
-			return fmt.Sprintf("=> %s %s", filepath.Join("/assets", id), descr), nil
-		},
-	}
-
 	buf := new(bytes.Buffer)
 
-	if err := p.PreprocessBody(buf, preprocessFuncs); err != nil {
+	if err := p.PreprocessBody(buf, r.preprocessFuncs); err != nil {
 		return "", fmt.Errorf("preprocessing post body: %w", err)
 	}
 
@@ -159,8 +128,66 @@ func (r renderer) Add(a, b int) int { return a + b }
 
 func (a *api) tplHandler() (gemini.Handler, error) {
 
+	blogURL := func(path string, abs bool) string {
+		path = filepath.Join(a.params.PublicURL.Path, path)
+
+		if !abs {
+			return path
+		}
+
+		u := *a.params.PublicURL
+		u.Path = path
+		return u.String()
+	}
+
+	preprocessFuncs := post.PreprocessFunctions{
+		BlogURL: func(path string) string {
+			return blogURL(path, false)
+		},
+		AssetURL: func(id string) string {
+			path := filepath.Join("assets", id)
+			return blogURL(path, false)
+		},
+		PostURL: func(id string) string {
+			path := filepath.Join("posts", id) + ".gmi"
+			return blogURL(path, false)
+		},
+		StaticURL: func(path string) string {
+			httpPublicURL := *a.params.HTTPPublicURL
+			httpPublicURL.Path = filepath.Join(httpPublicURL.Path, "/static", path)
+			return httpPublicURL.String()
+		},
+		Image: func(args ...string) (string, error) {
+
+			var (
+				id    = args[0]
+				descr = "Image"
+			)
+
+			if len(args) > 1 {
+				descr = args[1]
+			}
+
+			path := blogURL(filepath.Join("assets", id), false)
+
+			return fmt.Sprintf("=> %s %s", path, descr), nil
+		},
+	}
+
 	allTpls := template.New("")
 
+	allTpls.Funcs(preprocessFuncs.ToFuncsMap())
+
+	allTpls.Funcs(template.FuncMap{
+		"BlogURLAbs": func(path string) string {
+			return blogURL(path, true)
+		},
+		"PostURLAbs": func(id string) string {
+			path := filepath.Join("posts", id) + ".gmi"
+			return blogURL(path, true)
+		},
+	})
+
 	err := fs.WalkDir(tplFS, "tpl", func(path string, d fs.DirEntry, err error) error {
 
 		if err != nil {
@@ -219,10 +246,9 @@ func (a *api) tplHandler() (gemini.Handler, error) {
 		buf := new(bytes.Buffer)
 
 		err := tpl.Execute(buf, renderer{
-			url:           r.URL,
-			postStore:     a.params.PostStore,
-			gmiPublicURL:  a.params.PublicURL,
-			httpPublicURL: a.params.HTTPPublicURL,
+			url:             r.URL,
+			postStore:       a.params.PostStore,
+			preprocessFuncs: preprocessFuncs,
 		})
 
 		if err != nil {
diff --git a/src/gmi/tpl/feed.xml b/src/gmi/tpl/feed.xml
new file mode 100644
index 0000000..497fb11
--- /dev/null
+++ b/src/gmi/tpl/feed.xml
@@ -0,0 +1,28 @@
+{{ $getPostsRes := .GetPosts 0 15 -}}
+{{ $posts := $getPostsRes.Posts -}}
+
+<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom">
+  <title>mediocregopher's lil web corner</title>
+  <id>{{ BlogURLAbs "/" }}</id>
+  {{ if gt (len $posts) 0 -}}
+  <updated>{{ (index $posts 0).PublishedAt.Format "2006-01-02T15:04:05Z07:00" }}</updated>
+  {{ end -}}
+  <link href="{{ BlogURLAbs "/" }}"></link>
+  <author>
+    <name>mediocregopher</name>
+  </author>
+  {{ range $posts -}}
+  <entry>
+    <title>{{ .Title }}</title>
+    <updated>{{ .PublishedAt.Format "2006-01-02T15:04:05Z07:00" }}</updated>
+    <id>{{ PostURLAbs .ID }}</id>
+    <link href="{{ PostURLAbs .ID }}" rel="alternate"></link>
+    {{ if .Description -}}
+    <summary type="html">{{ .Description }}</summary>
+    {{ end -}}
+    <author>
+      <name>mediocregopher</name>
+    </author>
+  </entry>
+  {{ end -}}
+</feed>
diff --git a/src/gmi/tpl/posts/index.gmi b/src/gmi/tpl/posts/index.gmi
index dd4c84c..9d0f6e2 100644
--- a/src/gmi/tpl/posts/index.gmi
+++ b/src/gmi/tpl/posts/index.gmi
@@ -9,7 +9,7 @@
 {{ end -}}
 
 {{ range $getPostsRes.Posts -}}
-=> /posts/{{ .ID }}.gmi {{ .PublishedAt.Format "2006-01-02" }} - {{ .Title }}
+=> {{ PostURL .ID }} {{ .PublishedAt.Format "2006-01-02" }} - {{ .Title }}
 
 {{ end -}}
 
-- 
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