Executes the current ruby line when there is a # => marker at the end replacing it with the evaled result

RubyExecuteLineWithMarker.vim

" Executes the current ruby line when there is a # =>
" marker at the end replacing it with the evaled
" result
function! RubyExecuteLineWithMarker()
    ruby << EOF
        marker = '# =>'
        buffer = VIM::Buffer.current
        if buffer.line.match(/#{marker}/)
          result = marker + ' ' + eval(buffer.line, binding).inspect
          buffer.line = buffer.line.sub(/#{marker}.*/, result).chomp
        end
EOF
endfunction
com! RubyExecuteLineWithMarker call RubyExecuteLineWithMarker()