feat(sharing): Enable customizing the sharing links

Previously the sharing links were fixed at twitter, facebook, email.
This patch makes it possible to opt in and out of the networks
supported by the share_post plug-in.

documentation/content/Supported Plugins/share-post-plugin.md

@@ -35,6 +35,16 @@ configuration variable in your Pelican configuration.
 PLUGINS = ['share_post']
 ```
 
+Optionally, customize the list of networks where the article can be shared using `SHARE_LINKS`.
+
+```python
+SHARE_LINKS = [ ('twitter', 'Twitter'), ('facebook', 'Facebook'), ('email', 'Email') ]
+```
+
+The first item in each pair refers to a network recognized by `share_post`. Currently the list of supported networks includes `twitter`, `facebook`, `email`, `hacker-news`, `linkedin` and `reddit`. The second item in each pair is the text displayed for the link on the page. 
+
+The sharing links are displayed in the order of `SHARE_LINKS`, therefore this variable can also be used to customize the link order.
+
 !!! note
 
     The [share_post plugin](https://github.com/getpelican/pelican-plugins/blob/master/share_post/README.md) requires the Python `beautifulsoup4` package to be installed.

documentation/pelicanconf.py

@@ -122,6 +122,10 @@
     "Documentation of Elegant, a theme for Pelican, originally created by Talha Mansoor"
 )
 
+# Share links at bottom of articles
+# Supported: twitter, facebook, hacker-news, reddit, linkedin, email
+SHARE_LINKS = [ ('twitter', 'Twitter'), ('facebook', 'Facebook'), ('email', 'Email') ]
+
 # Landing Page
 PROJECTS_TITLE = "Related Projects"
 PROJECTS = [

templates/_includes/_defaults.html

@@ -224,3 +224,9 @@
 {% else %}
 {% set APPLAUSE_BUTTON = APPLAUSE_BUTTON %}
 {% endif %}
+
+{% if not SHARE_LINKS %}
+{% set SHARE_LINKS = [ ('twitter', 'Twitter'), ('facebook', 'Facebook'), ('email', 'Email') ] %}
+{% else %}
+{% set SHARE_LINKS = SHARE_LINKS %}
+{% endif %}

templates/_includes/share_links.html

@@ -1,17 +1,16 @@
 {% macro share_links(article) %}
-    {% if article.share_post and article.status != 'draft' %}
+    {% from '_includes/_defaults.html' import SHARE_LINKS with context %}
+    {% if article.share_post and article.status != 'draft' and SHARE_LINKS %}
     <p id="post-share-links">
     {% if article.share_post_intro %}
     {{ article.share_post_intro }}
     {% else %}
     {% from '_includes/_defaults.html' import SHARE_POST_INTRO with context %}
     {{ SHARE_POST_INTRO }}
     {% endif %}
-    <a href="{{ article.share_post['twitter'] }}" target="_blank" rel="nofollow noopener noreferrer" title="Share on Twitter">Twitter</a>
-    ❄
-    <a href="{{ article.share_post['facebook'] }}" target="_blank" rel="nofollow noopener noreferrer" title="Share on Facebook">Facebook</a>
-    ❄
-    <a href="{{ article.share_post['email'] }}" target="_blank" rel="nofollow noopener noreferrer" title="Share via Email">Email</a>
-    </p>
+    {% for network, label in SHARE_LINKS %}
+      {% if not loop.first %} ❄ {% endif %}
+      <a href="{{ article.share_post[network] }}" target="_blank" rel="nofollow noopener noreferrer" title="Share {% if network == 'email' %}via{% else %}on{% endif %} {{ label }}">{{ label }}</a>
+    {% endfor %}
     {% endif %}
 {% endmacro %}