* guix-kernel/jupyter-client.scm (<header>, <message>, message)
(make-message, message-parts, reply, message-type, message-sender)
(string->header, header->string, parts->message, DELIM): Move to...
* jupyter/messages.scm: ... here.  New file.
(get-signature, make-id): New procedures.
* guix-kernel/hmac.msc, guix-kernel/tools.scm, tests/tools.scm: Remove.
* Makefile.am (SOURCES, SCM_TESTS): Adjust accordingly.
* guix-jupyter-container.scm, guix-jupyter-kernel.scm,
guix-kernel/jupyter-client.scm: Adjust import list accordingly.
* tests/hmac.scm (get-signature): New variable.

* guix-kernel/jupyter-client.scm (<notebook>, notebook): Remove.
(json->notebook): Rename to...
(json->kernel): ... this, and adjust accordingly.
(read-message, send-message, relay-message, pub, pub-busy)
(pub-idle, reply-html): Adjust accordingly.
* guix-kernel/jupyter-server.scm (<kernel>)[key]: New field.
(kernel-iopub): New macro.
(kernel): Add #:key.
(close-kernel): New procedure.
* guix-jupyter-kernel.scm: Adjust, replacing "notebook" with "kernel".
* guix-jupyter-container.scm: Likewise.

Introduce <message> and <header> record that map directly to the Jupyter
specs.

This is a breaking change.

* guix-kernel/jupyter-client.scm (pub, pub-busy, pub-idle): Remove
'socket' and 'key' parameters, add 'notebook' parameter instead.

* guix-kernel/jupyter-client.scm (<notebook>): New record type.
(json->notebook, close-notebook): New procedures.
* guix-jupyter-kernel.scm (%notebook): New variable.
(notebook-info, get-notebook-info-atom)
(notebook-info-control-port, notebook-info-shell-port)
(notebook-info-transport, notebook-info-signature-scheme)
(notebook-info-stdin-port, notebook-info-heartbeat-port)
(notebook-info-ip, notebook-info-iopub-port)
(notebook-info-key, create-address, context)
(addr-heartbeat, addr-shell, addr-control, addr-iopub)
(addr-stdin, socket-heartbeat, socket-shell, socket-control)
(socket-iopub, socket-stdin, addresses, sockets): Remove.
Remove top-level calls to 'zmq-set-socket-option' and
'zmq-bind-socket'.
(proxy-exec-container, heartbeat-handler, general-handler)
(reply-kernel-info-request, reply-execute-request)
(start-container, start-kernel): Refer to %NOTEBOOK instead of referring
to the individual variables.
(atexit, sig-exit-handler): Remove.
(shutdown): Remove call to 'atexit'.
(exit-handler): New procedure.
Use it in top-level 'sigaction' calls.

This avoids the occasional string decoding error for byte streams that
were not actual UTF-8 strings.

This is based on commit fbab29d738b46d8637579ccec93be49520a4606f ("Fixed
a bug when the kernel could not send kernel_info (1 minute pause after
notebook starts)") of <https://github.com/jerry40/guile-kernel

>.

* guix-jupyter-container.scm (reply-execute-request): Turn UUID into a
bytevector.
* guix-jupyter-kernel.scm (send-to-container): Turn NAME into a
bytevector and use 'zmq-send-msg-parts-bytevector'.
(heartbeat-handler): Use '-bytevector' send and receive procedures.
(general-handler): Likewise.  Add calls to 'utf8->string' as needed.
* guix-kernel/jupyter-client.scm (send-to-jupyter)
(pub): Likewise.
* guix-kernel/jupyter-server.scm (run-kernel): Likewise.

Co-authored-by: jerry40 <epanfilov@gmail.com>

* guix-jupyter-kernel.scm: Get magic command 'html'.
* guix-jupyter-container.scm (reply-html-to-kernel): Add
  'guix-end-of-eval' message.
* guix-kernel/jupyter-client.scm (reply-html): Remove
  'guix-end-of-eval' message.

* guix-jupyter-container.scm (proxy-exec-kernel): Get streams message
  type.
  (local-eval): Send 'guix-end-of-eval' message.
* guix-jupyter-kernel.scm (proxy-exec-container): Get streams message
  type.
* guix-kernel/jupyter-client.scm (reply-html): Send 'guix-end-of-eval'
  message.
* guix-kernel/jupyter-server.scm (exec-kernel): Add IPython.

* guix-kernel/magic.scm (magic-html?): New procedure.
* guix-jupyter-container.scm (reply-html-to-kernel,
  kernel-info->html): New procedures.
* guix-jupyter-kernel.scm: Minor change.
* guix-kernel/html.scm: New file.
* guix-kernel/jupyter-client.scm (reply-html): New procedure.
* Makefile.am: Add 'guix-kernel/html.scm'.
* guix-kernel-demo.ipynb: Add example for new features.

* guix-kernel/jupyter-client.scm: New file.
* guix-jupyter-container.scm: Use module 'guix-kernel jupyter-client'.
* guix-jupyter-kernel.scm: Use module 'guix-kernel jupyter-client'.
* Makefile.am: Add 'guix-kernel/jupyter-client.scm' to SOURCE.