Make the internal link replacer function public.

So it can be used from outside.

pelican/contents.py

@@ -228,30 +228,7 @@ class Content(object):
         key = key if self.in_default_lang else 'lang_%s' % key
         return self._expand_settings(key)
 
-    def _update_content(self, content, siteurl):
+    def _link_replacer(self, siteurl, m):
-        """Update the content attribute.
-
-        Change all the relative paths of the content to relative paths
-        suitable for the output content.
-
-        :param content: content resource that will be passed to the templates.
-        :param siteurl: siteurl which is locally generated by the writer in
-                        case of RELATIVE_URLS.
-        """
-        if not content:
-            return content
-
-        instrasite_link_regex = self.settings['INTRASITE_LINK_REGEX']
-        regex = r"""
-            (?P<markup><[^\>]+  # match tag with all url-value attributes
-                (?:href|src|poster|data|cite|formaction|action)\s*=\s*)
-
-            (?P<quote>["\'])      # require value to be quoted
-            (?P<path>{0}(?P<value>.*?))  # the url value
-            \2""".format(instrasite_link_regex)
-        hrefs = re.compile(regex, re.X)
-
-        def replacer(m):
         what = m.group('what')
         value = urlparse(m.group('value'))
         path = value.path
@@ -313,7 +290,30 @@ class Content(object):
         return ''.join((m.group('markup'), m.group('quote'), origin,
                         m.group('quote')))
 
-        return hrefs.sub(replacer, content)
+    def _update_content(self, content, siteurl):
+        """Update the content attribute.
+
+        Change all the relative paths of the content to relative paths
+        suitable for the output content.
+
+        :param content: content resource that will be passed to the templates.
+        :param siteurl: siteurl which is locally generated by the writer in
+                        case of RELATIVE_URLS.
+        """
+        if not content:
+            return content
+
+        instrasite_link_regex = self.settings['INTRASITE_LINK_REGEX']
+        regex = r"""
+            (?P<markup><[^\>]+  # match tag with all url-value attributes
+                (?:href|src|poster|data|cite|formaction|action)\s*=\s*)
+
+            (?P<quote>["\'])      # require value to be quoted
+            (?P<path>{0}(?P<value>.*?))  # the url value
+            \2""".format(instrasite_link_regex)
+        hrefs = re.compile(regex, re.X)
+
+        return hrefs.sub(lambda m: self._link_replacer(siteurl, m), content)
 
     def get_siteurl(self):
         return self._context.get('localsiteurl', '')