From 5d52eeebc678277ced0ee16f7d8dc12a89b61377 Mon Sep 17 00:00:00 2001
From: Patrick Mayr <patrick@fet.at>
Date: Thu, 20 Jan 2022 12:45:15 +0000
Subject: [PATCH] add previous post

---
 fet2020/posts/views.py            | 25 +++++++++++++++++++++++++
 fet2020/templates/posts/show.html |  2 +-
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/fet2020/posts/views.py b/fet2020/posts/views.py
index 567e0bb4..6be98a3e 100644
--- a/fet2020/posts/views.py
+++ b/fet2020/posts/views.py
@@ -202,6 +202,7 @@ def show(request, id=None):
         "author": author,
         "author_image": author_image,
         "next": __next(post, public_only),
+        "previous": get_previous_dict(p),
         "related_posts": related_posts[0:6],
         "ep_agenda_link": ep_agenda_link,
         "ep_protocol_link": ep_protocol_link,
@@ -282,3 +283,27 @@ def __next(post=None, public=True):
                 break
 
     return d
+
+
+def get_previous_dict(post=None):
+    # TODO: Docstring
+    posts = None
+    d = post.slug
+
+    if post:
+        # TODO: bad implementation but it works!!
+        if post.post_type == "N" or post.post_type == "E":
+            posts = Post.articles.get_visible_articles()
+        elif post.post_type == "F":
+            posts = FetMeeting.objects.get_queryset().order_by("-event_start")
+
+    if posts:
+        for k, v in enumerate(posts):
+            if post.slug == v.slug:
+                if k < 1:
+                    d = posts[len(posts) - 1].slug
+                else:
+                    d = posts[k - 1].slug
+                break
+
+    return d
diff --git a/fet2020/templates/posts/show.html b/fet2020/templates/posts/show.html
index 9199f5ca..3c1cba68 100644
--- a/fet2020/templates/posts/show.html
+++ b/fet2020/templates/posts/show.html
@@ -15,7 +15,7 @@
 {% block content %}
 	<!-- Main Content -->
 	<main class="container mx-auto w-full flex-1 my-8 sm:flex flex-col sm:px-4">
-		<a href="#" class="hidden z-20 fixed left-0 top-1/2 -mt-8 p-2 xl:flex items-center text-gray-400 dark:text-gray-300 rounded-md"
+		<a href="{% url 'posts:posts.show' previous %}" class="hidden z-20 fixed left-0 top-1/2 -mt-8 p-2 xl:flex items-center text-gray-400 dark:text-gray-300 rounded-md"
 			x-data="{ showPrevArticleButton : false }"
 			@mouseleave="showPrevArticleButton = false"
 			@mouseover="showPrevArticleButton = true"