option -t doesn't work

[VladimirAlexiev]

I've tried many different ways to specify the format of input and couldn't.
As a result, jsonld 0.3.0 cannot convert RDF to JSONLD, only the opposite direction.

This is a MAJOR bug.

>jsonld format EPCIS.nq
[object Object]
Error: {
  "message": "Unable to auto-detect format.",
  "url": "EPCIS.nq"
}

>jsonld format -t application/n-quads EPCIS.nq
[object Object]
Error: {
  "message": "Unable to auto-detect format.",
  "url": "EPCIS.nq"
}

>jsonld format -t application/nquads EPCIS.nq
[object Object]
Error: {
  "message": "Unable to auto-detect format.",
  "url": "EPCIS.nq"
}

>jsonld format -t nquads EPCIS.nq
[object Object]
Error: {
  "message": "Unable to auto-detect format.",
  "url": "EPCIS.nq"
}

>jsonld format -t nq EPCIS.nq
[object Object]
Error: {
  "message": "Unable to auto-detect format.",
  "url": "EPCIS.nq"
}

And similar for a Turtle file:

>jsonld format EPCIS.ttl
[object Object]
Error: {
  "message": "Unable to auto-detect format.",
  "url": "EPCIS.ttl"
}

>jsonld format -t text/turtle EPCIS.ttl
[object Object]
Error: {
  "message": "Unable to auto-detect format.",
  "url": "EPCIS.ttl"
}

>jsonld format -t ttl EPCIS.ttl
[object Object]
Error: {
  "message": "Unable to auto-detect format.",
  "url": "EPCIS.ttl"
}

So I use riot for RDF->JSONLD.

• cons: you can't specify a context
• pro: it infers a rich context, eg

    "rangeIncludes" : {
      "@id" : "http://schema.org/rangeIncludes",
      "@type" : "@id"
    },

• cons: it renders lists with rdf:first, rdf:rest

See gs1/EPCIS#238 for discussion

[VladimirAlexiev]

• I just retested with witht he latest version, the bug still stands.
• https://github.com/gs1/EPCIS/tree/master/Ontology#jsonld-cli documents how we use the tool for jsonld formatting