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shell message.content.payload is ignored (causing IRkernel ?foo/help(foo) to return no result)

See original GitHub issue

I’m seeing a funny behavior with IRkernel where ?foo / help(foo) doesn’t return a result. (Convo moved in from https://nteract.slack.com/archives/C4S4H8DN1/p1525387222000158.)

I think the root of the problem is:

There’s no output_type: 'display_data' or output_type: 'stream' msg, like for usual outputs
IRkernel is sending the help result on the shell channel in message.content.payload[0] and Hydrogen isn’t looking for messages there (as per https://github.com/nteract/hydrogen/blob/master/lib/kernel.js#L323-L334)

{
  "idents": [],
  "header": {...},
  "parent_header": {...},
  "metadata": {},
  "content": {
    "status": "ok",
    "execution_count": 2,
    "payload": [
      {
        "source": "page",
        "data": {
          "text/html": "No documentation for 'foo' in specified packages and libraries:\nyou could try '??foo'",
          "text/latex": "No documentation for 'foo' in specified packages and libraries:\nyou could try '??foo'",
          "text/plain": "No documentation for 'foo' in specified packages and libraries:\nyou could try '??foo'"
        },
        "metadata": {}
      }
    ],
    "user_expressions": {}
  },
  "buffers": []
}

But jupyter console does manage to find the payload from the ‘shell’ channel, somehow:

$ jupyter console --kernel=ir

In [1]: ?foo
No documentation for 'foo' in specified packages and libraries:
you could try '??foo'

In [2]: help(foo)
No documentation for 'foo' in specified packages and libraries:
you could try '??foo'

Versions: