From a118c995e937603b13df3bd38addd44d69b76ac0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Abel=20Alfonso=20F=C3=ADrvida=20Don=C3=A9stevez?=
 <abel@merchise.org>
Date: Mon, 16 Mar 2020 14:41:03 -0400
Subject: [PATCH] Add image tag for cover image of articles.

So many blogs may need cover image in their articles. In this commit we add a
way to insert image in the article metadata. Also an example of how to use it
in a theme is added to the simple theme.
---
 pelican/generators.py                        | 1 +
 pelican/readers.py                           | 4 +++-
 pelican/themes/simple/templates/article.html | 3 +++
 pelican/writers.py                           | 1 +
 4 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/pelican/generators.py b/pelican/generators.py
index 02667cd7..ae6f1bb1 100644
--- a/pelican/generators.py
+++ b/pelican/generators.py
@@ -286,6 +286,7 @@ class ArticlesGenerator(CachingGenerator):
         self.categories = defaultdict(list)
         self.related_posts = []
         self.authors = defaultdict(list)
+        self.images = defaultdict(list)
         self.drafts = []                   # only drafts in default language
         self.drafts_translations = []
         super().__init__(*args, **kwargs)
diff --git a/pelican/readers.py b/pelican/readers.py
index 673b637e..dff607c5 100644
--- a/pelican/readers.py
+++ b/pelican/readers.py
@@ -42,7 +42,8 @@ DUPLICATES_DEFINITIONS_ALLOWED = {
     'save_as': False,
     'url': False,
     'authors': False,
-    'slug': False
+    'slug': False,
+    'image': False
 }
 
 METADATA_PROCESSORS = {
@@ -60,6 +61,7 @@ METADATA_PROCESSORS = {
         for author in ensure_metadata_list(x)
     ] or _DISCARD),
     'slug': lambda x, y: x.strip() or _DISCARD,
+    'image': lambda x, y: x.strip() or _DISCARD
 }
 
 logger = logging.getLogger(__name__)
diff --git a/pelican/themes/simple/templates/article.html b/pelican/themes/simple/templates/article.html
index 5a1c093d..49d9d915 100644
--- a/pelican/themes/simple/templates/article.html
+++ b/pelican/themes/simple/templates/article.html
@@ -30,6 +30,9 @@
  {% import 'translations.html' as translations with context %}
  {{ translations.translations_for(article) }}
   </header>
+  {% if article.image %}
+    <img src="{{ article.image }}"/>
+  {% endif %}
   <footer class="post-info">
     <time class="published" datetime="{{ article.date.isoformat() }}">
       {{ article.locale_date }}
diff --git a/pelican/writers.py b/pelican/writers.py
index 7bbd216e..852b4744 100644
--- a/pelican/writers.py
+++ b/pelican/writers.py
@@ -81,6 +81,7 @@ class Writer(object):
         feed.add_item(
             title=title,
             link=link,
+            image=item.image,
             unique_id=get_tag_uri(link, item.date),
             description=description,
             content=content,