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#!/usr/bin/env ruby
require 'ffi'
module CMark
extend FFI::Library
class Mem < FFI::Struct
layout :calloc, :pointer,
:realloc, :pointer,
:free, callback([:pointer], :void)
end
ffi_lib ['libcmark', 'cmark']
attach_function :cmark_get_default_mem_allocator, [], :pointer
attach_function :cmark_markdown_to_html, [:string, :size_t, :int], :pointer
end
def markdown_to_html(s)
len = s.bytesize
cstring = CMark::cmark_markdown_to_html(s, len, 0)
result = cstring.get_string(0)
mem = CMark::cmark_get_default_mem_allocator
CMark::Mem.new(mem)[:free].call(cstring)
result
end
STDOUT.write(markdown_to_html(ARGF.read()))
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