Add remove_code_chunks template filter

It will be needed when generating feeds

blog/templatetags/code_chunks.py

@@ -28,6 +28,39 @@ def hilite(language, code):
     formatter = CodeFormatter(style = SolarizedDarkStyle, linenos = False, cssclass = language + " code", noclasses = True)
     return highlight(code, lexer, formatter)
 
+@register.filter(needs_autoescape=True)
+@stringfilter
+def remove_code_chunks(value, autoescape=None):
+    p = re.compile('\[\$ code:(?P<lang>[^:]+):(?P<slug>[^ ]+) \$\]')
+    i = p.finditer(value)
+    diff = 0
+
+    for match in i:
+        end, start = match.span()
+        oldlen = start - end
+        start += diff
+        end += diff
+        newstr = ""
+        newlen = len(newstr)
+        value = value[:end] + newstr + value[start:]
+        diff += newlen - oldlen
+
+    p = re.compile('\[\$ code:(?P<lang>[^:]+):(?P<code>.+?) \$\]', re.DOTALL)
+    i = p.finditer(value)
+    diff = 0
+
+    for match in i:
+        end, start = match.span()
+        oldlen = start - end
+        start += diff
+        end += diff
+        newstr = ""
+        newlen = len(newstr)
+        value = value[:end] + newstr + value[start:]
+        diff += newlen - oldlen
+
+    return mark_safe(value)
+
 @register.filter(needs_autoescape=True)
 @stringfilter
 def insert_code_chunks(value, autoescape=None):