1.0.24: Do not break the XML if a footnote is referenced multiply

kramdown-rfc2629.gemspec

@@ -1,6 +1,6 @@
 spec = Gem::Specification.new do |s|
   s.name = 'kramdown-rfc2629'
-  s.version = '1.0.23'
+  s.version = '1.0.24'
   s.summary = "Kramdown extension for generating RFC 2629 XML."
   s.description = %{An RFC2629 (XML2RFC) generating backend for Thomas Leitner's
 "kramdown" markdown parser.  Mostly useful for RFC writers.}

lib/kramdown-rfc2629.rb

@@ -102,6 +102,7 @@ def initialize(*doc)
         super
         @sec_level = 1
         @in_dt = 0
+        @footnote_names_in_use = {}
       end
 
       def convert(el, indent = -INDENTATION, opts = {})
@@ -490,6 +491,14 @@ def convert_footnote(el, indent, opts) # XXX: footnotes into crefs???
         content = inner(el.value, indent, opts).strip
         content = escape_html(content.sub(/\A<t>(.*)<\/t>\z/m) {$1}, :text) # text only...
         name = el.options[:name].sub(/\A[0-9]/) {"_" << $&}
+        while @footnote_names_in_use[name] do
+          if name =~ /:\d+\z/
+            name.succ!
+          else
+            name << ":1"
+          end
+        end
+        @footnote_names_in_use[name] = true
         attrstring = el_html_attributes_with(el, {"anchor" => name})
         "\n#{' '*indent}<cref#{attrstring}>#{content}</cref>"
       end