From 293655452cfc6a106c55384e839f9c07d340b954 Mon Sep 17 00:00:00 2001
From: Brian Picciano <mediocregopher@gmail.com>
Date: Sat, 21 Jan 2023 16:46:11 +0100
Subject: [PATCH] Continue to polish up posts pages

---
 src/gmi/gmi.go              | 20 ++++++++++++++++-
 src/gmi/tpl.go              | 44 +++++++++++++++++++++++++++++++++----
 src/gmi/tpl/index.gmi       |  4 ++--
 src/gmi/tpl/posts/index.gmi | 11 ++++++----
 src/gmi/tpl/posts/post.gmi  | 24 ++++++++++++++++++++
 5 files changed, 92 insertions(+), 11 deletions(-)

diff --git a/src/gmi/gmi.go b/src/gmi/gmi.go
index 7d4d186..b543e05 100644
--- a/src/gmi/gmi.go
+++ b/src/gmi/gmi.go
@@ -119,6 +119,21 @@ func (a *api) Shutdown(ctx context.Context) error {
 	return a.srv.Shutdown(ctx)
 }
 
+func indexMiddleware(h gemini.Handler) gemini.Handler {
+
+	return gemini.HandlerFunc(func(
+		ctx context.Context,
+		rw gemini.ResponseWriter,
+		r *gemini.Request,
+	) {
+		if strings.HasSuffix(r.URL.Path, "/") {
+			r.URL.Path += "index.gmi"
+		}
+
+		h.ServeGemini(ctx, rw, r)
+	})
+}
+
 func postsMiddleware(tplHandler gemini.Handler) gemini.Handler {
 
 	return gemini.HandlerFunc(func(
@@ -156,7 +171,10 @@ func (a *api) handler() (gemini.Handler, error) {
 	mux.Handle("/posts/", postsMiddleware(tplHandler))
 	mux.Handle("/", tplHandler)
 
-	h := mux
+	var h gemini.Handler
+
+	h = mux
+	h = indexMiddleware(h)
 
 	// TODO logging
 	// TODO caching
diff --git a/src/gmi/tpl.go b/src/gmi/tpl.go
index 7aa1a2f..7959b8e 100644
--- a/src/gmi/tpl.go
+++ b/src/gmi/tpl.go
@@ -25,6 +25,11 @@ type rendererGetPostsRes struct {
 	HasMore bool
 }
 
+type rendererGetPostSeriesNextPreviousRes struct {
+	Next     *post.StoredPost
+	Previous *post.StoredPost
+}
+
 type renderer struct {
 	url       *url.URL
 	postStore post.Store
@@ -43,6 +48,41 @@ func (r renderer) GetPostByID(id string) (post.StoredPost, error) {
 	return p, nil
 }
 
+func (r renderer) GetPostSeriesNextPrevious(p post.StoredPost) (rendererGetPostSeriesNextPreviousRes, error) {
+
+	seriesPosts, err := r.postStore.GetBySeries(p.Series)
+	if err != nil {
+		return rendererGetPostSeriesNextPreviousRes{}, fmt.Errorf(
+			"fetching posts for series %q: %w", p.Series, err,
+		)
+	}
+
+	var (
+		res       rendererGetPostSeriesNextPreviousRes
+		foundThis bool
+	)
+
+	for i := range seriesPosts {
+
+		seriesPost := seriesPosts[i]
+
+		if seriesPost.ID == p.ID {
+			foundThis = true
+			continue
+		}
+
+		if !foundThis {
+			res.Next = &seriesPost
+			continue
+		}
+
+		res.Previous = &seriesPost
+		break
+	}
+
+	return res, nil
+}
+
 func (r renderer) GetQueryValue(key, def string) string {
 	v := r.url.Query().Get(key)
 	if v == "" {
@@ -97,10 +137,6 @@ func (a *api) tplHandler() (gemini.Handler, error) {
 		r *gemini.Request,
 	) {
 
-		if strings.HasSuffix(r.URL.Path, "/") {
-			r.URL.Path += "index.gmi"
-		}
-
 		tplPath := strings.TrimPrefix(r.URL.Path, "/")
 
 		ctx = mctx.Annotate(ctx,
diff --git a/src/gmi/tpl/index.gmi b/src/gmi/tpl/index.gmi
index 7c68b92..9f12e0d 100644
--- a/src/gmi/tpl/index.gmi
+++ b/src/gmi/tpl/index.gmi
@@ -1,3 +1,3 @@
-# Index
+# mediocregopher's lil web corner
 
-=> /posts/index.gmi See all posts
+=> /posts/ See all posts
diff --git a/src/gmi/tpl/posts/index.gmi b/src/gmi/tpl/posts/index.gmi
index 12eb39c..dd4c84c 100644
--- a/src/gmi/tpl/posts/index.gmi
+++ b/src/gmi/tpl/posts/index.gmi
@@ -1,10 +1,10 @@
 # mediocregopher's Posts
 
 {{ $page := .GetQueryIntValue "page" 0 -}}
-{{ $getPostsRes := .GetPosts $page 20 -}}
+{{ $getPostsRes := .GetPosts $page 15 -}}
 
 {{ if gt $page 0 -}}
-=> /posts.gmi?page={{ .Add $page -1 }} Previous Page
+=> /posts/?page={{ .Add $page -1 }} Previous Page
 
 {{ end -}}
 
@@ -14,5 +14,8 @@
 {{ end -}}
 
 {{ if $getPostsRes.HasMore -}}
-=> /posts.gmi?page={{ .Add $page 1 }} Next page
-{{ end -}}
+=> /posts/?page={{ .Add $page 1 }} Next page
+{{ end }}
+================================================================================
+
+=> / Home
diff --git a/src/gmi/tpl/posts/post.gmi b/src/gmi/tpl/posts/post.gmi
index 52ac5ff..4f58c84 100644
--- a/src/gmi/tpl/posts/post.gmi
+++ b/src/gmi/tpl/posts/post.gmi
@@ -7,3 +7,27 @@
 {{ end -}}
 
 {{ $post.Body }}
+
+--------------------------------------------------------------------------------
+
+Published {{ $post.PublishedAt.Format "2006-01-02" }}
+
+{{- if $post.Series }}
+
+This post is part of a series!
+
+{{ $seriesNextPrev := .GetPostSeriesNextPrevious $post -}}
+
+{{ if $seriesNextPrev.Next -}}
+=> /posts/{{ $seriesNextPrev.Next.ID }}.gmi Next: {{ $seriesNextPrev.Next.Title }}
+{{ end -}}
+
+{{ if $seriesNextPrev.Previous -}}
+=> /posts/{{ $seriesNextPrev.Previous.ID }}.gmi Previously: {{ $seriesNextPrev.Previous.Title }}
+{{ end -}}
+
+{{ end }}
+================================================================================
+
+=> /posts/ More posts
+=> /       Home