no parser to handle the specified input format about kramdown

[gettalong]

The code in Kramdown::Document.new does the following to get the parser:

      if Parser.const_defined?(parser)
        @root, @warnings = Parser.const_get(parser).parse(source, @options)
      else
        raise Kramdown::Error.new("kramdown has no parser to handle the specified input format: #{options[:input]}")
      end

Since the built-in parsers are only loaded on demand using autoload you may experience the problem because of multi-threading. I have had these problems with autoload, multi-threading and Rails in a different context where Rails was creating the problems. The only solution I could find was to pre-load the needed constants by either referencing them or require-ing the file they are defined in.

[jc00ke]

Unfortunately options[:input] is nil or empty.

(Kramdown::Error) "kramdown has no parser to handle the specified input format: "

Curious as to why you autoload the parsers?

[gettalong]

options[:input] being nil is okay because then the default parser, kramdown, will be used. However, if it is empty, ie. "" kramdown will try to load a class without a name which is not possible. So you have to make sure that you either pass a valid kramdown parser name or nil in options[:input].

As for using autoload: This is the easiest way to ensure that the classes are available when referenced and avoid loading all parsers/converters at startup.

[jc00ke]

Cool, thanks for the followup. I ended up just requiring all the parsers, which in my case isn't a big deal.

# config/initializers/kramdown.rb
require 'kramdown/parser/base'
require 'kramdown/parser/kramdown'
require 'kramdown/parser/html'
require 'kramdown/parser/markdown'