passing file args through ServiceRunner.txt

[lth@lappro bp-ruby] $ ../bpsdk/bin/ServiceRunner -providerPath src/build/RubyInterpreter tests/FileChecksum/
service initialized: FileChecksum v1.0.10
> help
Available commands:
  allocate [0 args]: Allocate a new service instance....
  describe [0 args]: Extract and display the API description of the ser...
  destroy [1 arg]: Destroy a service instance, the single required pa...
  help [0-1 args]: Displays command usage.  help <command> gives more...
  invoke [1-2 args]: Invoke a function on a service instance.  First ar...
  prompts [0 args]: Show the outstanding user prompts that have been s...
  quit [0 args]: Quit the program...
  respond [1-2 args]: Respond to a prompt from the service.  The first a...
  select [1 arg]: Select the current instance, this is a numeric id ...
  show [0 args]: Show the currently allocated service instances....
> desc
Describing corelet 'FileChecksum', version: 1.0.10
   Allows client side MD5 of user selected files.

1 function(s) supported:
   md5:
      Generate an md5 checksum of a file.

         path file
            The file for which to calculate a checksum.

> a
allocated: 1
> i md5 '{"file":"file:///Users/lth/TODO.txt"}'
"a942f1fe65c4f55d1a05c048c2c6b0b0"
> ^D
shutting down...
[lth@lappro bp-ruby] $ md5 ~/TODO.txt
MD5 (/Users/lth/TODO.txt) = a942f1fe65c4f55d1a05c048c2c6b0b0