liquid_tags: added speakerdeck tag

liquid_tags/Readme.md

@@ -93,6 +93,12 @@ are not specified, then the dimensions will be 640 (wide) by 390 (tall).
 If you experience issues with code generation (e.g., missing closing tags),
 add `SUMMARY_MAX_LENGTH = None` to your settings file.
 
+## Speakerdeck Tag
+To insert a Speakerdeck viewer into your content, enable the
+`liquid_tags.speakerdeck` plugin and add the following to your source document:
+
+    {% speakerdeck speakerdeck_id %}
+
 ## Video Tag
 To insert HTML5-friendly video into your content, enable the `liquid_tags.video`
 plugin and add the following to your source document:

liquid_tags/speakerdeck.py

@@ -0,0 +1,35 @@
+"""
+Speakerdeck Tag
+---------------
+This implements a Liquid-style speakerdeck tag for Pelican.
+
+Syntax
+------
+{% speakerdeck id %}
+
+Example
+-------
+{% speakerdeck 82b209c0f181013106da6eb14261a8ef %}
+
+Output
+------
+<script async class="speakerdeck-embed" data-id="82b209c0f181013106da6eb14261a8ef"
+ data-ratio="1.33333333333333" src="//speakerdeck.com/assets/embed.js"></script>
+"""
+from .mdx_liquid_tags import LiquidTags
+
+SYNTAX = "{% speakerdeck id %}"
+
+@LiquidTags.register('speakerdeck')
+def speakerdeck(preprocessor, tag, markup):
+    speakerdeck_out = """
+<script async class="speakerdeck-embed" data-id="{id}"
+data-ratio="1.33333333333333" src="//speakerdeck.com/assets/embed.js"></script>
+        """.format(id=markup)
+
+    return speakerdeck_out
+
+
+# ---------------------------------------------------
+# This import allows speakerdeck tag to be a Pelican plugin
+from liquid_tags import register  # noqa