From fd1494cf75cca6803f2887fb6d90cb4951b3a6d8 Mon Sep 17 00:00:00 2001
From: Noah <noah@caskir.net>
Date: Tue, 26 Nov 2019 17:30:31 -0800
Subject: [PATCH] Tags List page

---
 pkg/controllers/posts.go          | 17 +++++++++
 pkg/models/posts.go               |  7 ----
 pkg/models/tags.go                | 57 +++++++++++++++++++++++++++++++
 pvt-www/.layout.gohtml            |  3 ++
 pvt-www/_builtin/blog/tags.gohtml | 13 +++++++
 5 files changed, 90 insertions(+), 7 deletions(-)
 create mode 100644 pkg/models/tags.go
 create mode 100644 pvt-www/_builtin/blog/tags.gohtml

diff --git a/pkg/controllers/posts.go b/pkg/controllers/posts.go
index 081ef6f..10016e4 100644
--- a/pkg/controllers/posts.go
+++ b/pkg/controllers/posts.go
@@ -26,6 +26,11 @@ func init() {
 		Methods: []string{"GET"},
 		Handler: BlogIndex(models.Public, false),
 	})
+	glue.Register(glue.Endpoint{
+		Path:    "/tagged",
+		Methods: []string{"GET"},
+		Handler: TagIndex,
+	})
 	glue.Register(glue.Endpoint{
 		Path:    "/tagged/{tag}",
 		Methods: []string{"GET"},
@@ -158,6 +163,18 @@ func PartialBlogIndex(r *http.Request, tag, privacy string) template.HTML {
 	return template.HTML(html.String())
 }
 
+// TagIndex for "/tagged" to return all tags sorted by popularity.
+func TagIndex(w http.ResponseWriter, r *http.Request) {
+	// If not logged in, only summarize public post tags.
+	var public = !authentication.LoggedIn(r)
+
+	tags := models.SummarizeTags(public)
+
+	v := responses.NewTemplateVars(w, r)
+	v.V["tags"] = tags
+	responses.RenderTemplate(w, r, "_builtin/blog/tags.gohtml", v)
+}
+
 // EditPost at "/blog/edit"
 func EditPost(w http.ResponseWriter, r *http.Request) {
 	v := responses.NewTemplateVars(w, r)
diff --git a/pkg/models/posts.go b/pkg/models/posts.go
index fa1abb6..3497052 100644
--- a/pkg/models/posts.go
+++ b/pkg/models/posts.go
@@ -48,13 +48,6 @@ type PagedPosts struct {
 	PreviousPage int
 }
 
-// TaggedPost associates tags to their posts.
-type TaggedPost struct {
-	ID     uint `gorm:"primary_key"`
-	Tag    string
-	PostID uint // foreign key to Post
-}
-
 // New creates a new Post model.
 func (m postMan) New() Post {
 	return Post{
diff --git a/pkg/models/tags.go b/pkg/models/tags.go
new file mode 100644
index 0000000..d5c7abb
--- /dev/null
+++ b/pkg/models/tags.go
@@ -0,0 +1,57 @@
+package models
+
+import (
+	"git.kirsle.net/apps/gophertype/pkg/console"
+)
+
+// TaggedPost associates tags to their posts.
+type TaggedPost struct {
+	ID     uint `gorm:"primary_key"`
+	Tag    string
+	PostID uint // foreign key to Post
+}
+
+// SummarizeTags returns the list of all tags ordered by frequency used.
+// public: true for public view, don't count tags on private posts.
+func SummarizeTags(public bool) []TagSummary {
+	var result []TagSummary
+
+	query := DB.Table("tagged_posts").
+		Select("tagged_posts.tag, count(tagged_posts.post_id) AS count").
+		Joins("JOIN posts ON posts.id = tagged_posts.post_id").
+		Group("tagged_posts.tag").
+		Order("count desc")
+
+	if public {
+		query = query.Where("posts.privacy = ?", Public)
+	}
+
+	rows, err := query.Rows()
+	if err != nil {
+		console.Error("SummarizeTags: query.Rows: %s", err)
+	}
+
+	for rows.Next() {
+		var (
+			tagName string
+			count   int
+		)
+
+		if err := rows.Scan(&tagName, &count); err != nil {
+			console.Error("SummarizeTags: rows.Scan: %s", err)
+		}
+
+		result = append(result, TagSummary{
+			Tag:   tagName,
+			Count: count,
+		})
+	}
+
+	return result
+}
+
+// TagSummary holds the result for SummarizeTags
+type TagSummary struct {
+	Tag   string
+	Count int
+}
diff --git a/pvt-www/.layout.gohtml b/pvt-www/.layout.gohtml
index bb53691..6ee4723 100644
--- a/pvt-www/.layout.gohtml
+++ b/pvt-www/.layout.gohtml
@@ -32,6 +32,9 @@
             <li class="nav-item">
                 <a href="/about" class="nav-link">About</a>
             </li>
+            <li class="nav-item">
+                <a href="/tagged" class="nav-link">Tags</a>
+            </li>
             <li class="nav-item">
                 <a href="/archive" class="nav-link">Archive</a>
             </li>
diff --git a/pvt-www/_builtin/blog/tags.gohtml b/pvt-www/_builtin/blog/tags.gohtml
new file mode 100644
index 0000000..443b736
--- /dev/null
+++ b/pvt-www/_builtin/blog/tags.gohtml
@@ -0,0 +1,13 @@
+{{ define "title" }}Tags{{ end }}
+{{ define "content" }}
+<h1>Tags</h1>
+
+<p>Sorted by most frequently used:</p>
+
+<ul>
+{{ range $tag := .V.tags }}
+	<li><a href="/tagged/{{ $tag.Tag }}">{{ $tag.Tag }}</a> ({{ $tag.Count }})</li>
+{{ end }}
+</ul>
+
+{{ end }}