adds instagram liquid tag

liquid_tags/Readme.md

@@ -36,6 +36,13 @@ To use it:
 
 Images are read on compilation phase so you can use any local path (just be sure that image will remain there on next compilation)
 
+## Instagram Tag
+To insert a sized and labeled Instagram image in your document by its shortcode (such as ``pFI0CAIZna``), enable the ``liquid_tags.gram`` plugin and use the following:
+
+    {% gram shortcode [size] [width] [class name(s)] [title text | "title text" ["alt text"]] %}
+
+You can specify a size with `t`, `m`, or `l`.
+
 ## Youtube Tag
 To insert youtube video into a post, enable the
 ``liquid_tags.youtube`` plugin, and add to your document:

liquid_tags/gram.py

@@ -0,0 +1,100 @@
+"""
+Instagram Image Tag
+-------------------
+
+By `Tom Spalding <https://github.com/digitalvapor>`_
+
+You can see a working example at `antivapor.net/instagram-tag.html <http://antivapor.net/instagram-tag.html>`_.
+
+Based on `Liquid Image Tag <https://github.com/getpelican/pelican-plugins/blob/master/liquid_tags/img.py>`_ by `Jake Vanderplas <https://github.com/jakevdp>`_.
+
+Optional Todo:
+* Query JSON to automatically include descriptions.
+  http://api.instagram.com/oembed?url=http://instagr.am/p/olw8jXiz1_/
+  and option to add wrapping anchor link to original http://instagram.com/p/olw8jXiz1_
+* Default to size m
+  http://instagr.am/p/olw8jXiz1_/media/?size=t
+  http://instagr.am/p/olw8jXiz1_/media
+* Provide examples using with [Better Figures and Images](https://github.com/getpelican/pelican-plugins/tree/master/better_figures_and_images).
+
+Syntax
+------
+
+    {% gram shortcode [size] [width] [class name(s)] [title text | "title text" ["alt text"]] %}
+
+where size is t, m, or l, and it defaults to m. see http://instagram.com/developer/embedding.
+
+Examples
+--------
+
+    {% gram pFG7naIZkr t %}
+    {% gram pFJE11IZnx %}
+    {% gram pFI0CAIZna l 400 figure 'pretty turkey tail fungus' %}
+    {% gram rOru21oZpe l 450 test_class instagram 'warehouse window title' 'alt text' %}
+
+Output
+------
+
+    <img src="http://photos-c.ak.instagram.com/hphotos-ak-xaf1/t51.2885-15/917172_604907902963826_254280879_n.jpg" width="450" title="warehouse window title" alt="alt text" class="test_class instagram">
+"""
+import re
+import urllib
+from .mdx_liquid_tags import LiquidTags
+
+SYNTAX = '{% gram shortcode [size] [width] [class name(s)] [title text | "title text" ["alt text"]] %}'
+
+# Regular expression for full syntax
+# ReGram = re.compile("""(?P<shortcode>\S+)(?:\s+(?P<size>[tml]?))?(?:\s+(?P<width>\d*))?(?:\s+(?P<class>\S*))?(?P<title>\s+.+)?""")
+ReGram = re.compile("""(?P<shortcode>\S+)(?:\s+(?P<size>[tml]?))?(?:\s+(?P<width>\d*))?(?:\s+(?P<class>[^']*))?(?P<title>.+)?""")
+
+# Regular expression to split the title and alt text
+ReTitleAlt = re.compile("""(?:"|')(?P<title>[^"']+)?(?:"|')\s+(?:"|')(?P<alt>[^"']+)?(?:"|')""")
+
+@LiquidTags.register('gram')
+def gram(preprocessor, tag, markup):
+
+    attrs = None
+
+    # Parse the markup string
+    match = ReGram.search(markup)
+    if match:
+        attrs = dict([(key, val.strip())
+                      for (key, val) in match.groupdict().iteritems() if val])
+    else:
+        raise ValueError('Error processing input. '
+                         'Expected syntax: {0}'.format(SYNTAX))
+
+    # Construct URI
+    #print(attrs)
+    shortcode = attrs['shortcode']
+    url = 'http://instagr.am/p/'+shortcode+'/media/'
+    del attrs['shortcode']
+
+    if 'size' in attrs:
+        size = '?size={0}'.format(attrs['size'])
+        url = url+size
+        del attrs['size']
+
+    r = urllib.urlopen(url)
+
+    if(r.getcode()==404):
+        raise ValueError('%s isnt a photo.'%shortcode)
+
+    gram_url = r.geturl()
+
+    # Check if alt text is present -- if so, split it from title
+    if 'title' in attrs:
+        match = ReTitleAlt.search(attrs['title'])
+        if match:
+            attrs.update(match.groupdict())
+        if not attrs.get('alt'):
+            attrs['alt'] = attrs['title']
+
+    #print('updated dict: '+repr(attrs))
+
+    # Return the formatted text
+    return '<img src="{0}"{1}>'.format(gram_url,' '.join(' {0}="{1}"'.format(key,val) for (key,val) in attrs.iteritems()))
+
+#----------------------------------------------------------------------
+# This import allows image tag to be a Pelican plugin
+from liquid_tags import register