[Sync] Kazimir: img -> figure with caption

utils/Sync/kazimir/__init__.py

@@ -3,11 +3,13 @@ import requests
 from markdown import markdown
 
 from kazimir.video import VideoExtension
+from kazimir.figure import FigureExtension
 from kazimir.instagram import InstagramExtension
 
 
 def markdown_to_html(text):
     return markdown(text, extensions=[
+        FigureExtension(),
         VideoExtension(),
         InstagramExtension(),
     ])

utils/Sync/kazimir/figure.py

@@ -0,0 +1,44 @@
+from markdown import Extension
+from markdown.inlinepatterns import IMAGE_LINK_RE, IMAGE_REFERENCE_RE
+from markdown.blockprocessors import BlockProcessor
+from markdown.util import etree
+import re
+
+FIGURES = [
+    u'^\s*' + IMAGE_LINK_RE + u'\s*$',
+    u'^\s*' + IMAGE_REFERENCE_RE + u'\s*$',
+]
+
+TAG_FIGURE = 'figure'
+TAG_FIGCAPTION = 'figcaption'
+NAME = 'FigureAltCaption'
+
+
+class FigureProcessor(BlockProcessor):
+    FIGURES_RE = re.compile('|'.join(f for f in FIGURES))
+
+    def test(self, parent, block):
+        is_image = bool(self.FIGURES_RE.search(block))
+        is_single_list = (len(block.splitlines()) == 1)
+        is_in_figure = parent.tag == TAG_FIGURE
+
+        return is_image and is_single_list and not is_in_figure
+
+    def run(self, parent, blocks):
+        raw_block = blocks.pop(0)
+        caption_text = self.FIGURES_RE.search(raw_block).group(1)
+
+        figure = etree.SubElement(parent, TAG_FIGURE)
+        figure.text = raw_block
+
+        figcaption_elem = etree.SubElement(figure, TAG_FIGCAPTION)
+        figcaption_elem.text = caption_text
+
+
+class FigureExtension(Extension):
+    def extendMarkdown(self, md, md_globals):
+        md.parser.blockprocessors.add(
+            NAME,
+            FigureProcessor(md.parser),
+            '<ulist'
+        )