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Fixes #4.

* guix-jupyter-kernel.scm (handle-download): Handle the case where
'url-fetch' returns a plain file.

Fixes #3.

* jupyter/kernels.scm (call-with-busy-section): New procedure.
(with-busy-section): New macro.
* guix/jupyter/proxy.scm (proxy-request-handler): Wrap HANDLER call in
'with-busy-section'.

This is a followup to bc81615c.

* guix-jupyter-kernel.scm (reply-kernel-info-request): Call 'pub-idle'
instead of 'send-message' when sending a message to IOpub.

Fixes <https://issues.guix.gnu.org/49355>.
Reported by Domagoj Stolfa <ds815@gmx.com>.

* guix-jupyter-kernel.scm (reply-kernel-info-request): Send a reply on
'kernel-iopub' too.

* jupyter/servers.scm: Fix typos in docstrings and comments.

* guix-jupyter-kernel.scm <top level>: Add 'setvbuf' calls.

* VERSION: Bump to 0.2.1.

* guix/jupyter/kernel.scm (make-container-directory): Use 'mkdtemp!' to
create temporary as /tmp/guix-jupyter.XXXXXX.  This works around a bug
preventing multiple users from using Guix-Jupyter on the same machine at
the same time.
* jupyter/kernels.scm (exec-kernel): Likewise.

* VERSION: Bump to 0.2.0.

* README.org: Tweak.

* NEWS: New file.

This fixes "make distcheck".

* Makefile.am (EXTRA_DIST): Add $(TESTS) and 'test-driver.scm'.

* configure.ac: Adjust Guile error message.

* guix-jupyter-kernel.scm (reply-execute-request): Add 'guard' clause
for 'store-protocol-error?'.

* guix-jupyter-kernel.scm (create-environment): In the case where
several kernels are provided, rename formal parameter from 'file' to
'specs'.

This fixes a bug whereby ";;guix pin" would sometimes hang in the
'close-inferior' call in 'set-proxy-state-inferior'.

* guix-jupyter-kernel.scm (set-proxy-state-inferior):
Send (primitive-exit 0) to PREVIOUS.

* jupyter/guile.scm (picture?, picture->ssvg): New procedures.
(reply-execute-request): Return SVG if RESULT matches 'picture?'.

* jupyter/kernels.scm (sxml->html-string): Rename to...
(sxml->xml-string): ... this.
(reply-shtml): Adjust accordingly.
* guix-jupyter-kernel.scm (reply-for-environment-kernel): Likewise.
* guix/jupyter/kernel.scm (build-event-reporter)
(call-with-build-progress-report): Likewise.

* jupyter/kernels.scm (sxml->html-string): New procedure.
(reply-html): Rename to...
(reply-shtml): ... this.  Expect SHTML instead of HTML and adjust
accordingly.  Adjust all callers.
* guix/jupyter/kernel.scm (sxml->html-string): Remove.
* guix-jupyter-kernel.scm (sxml->html-string): Remove.

* guix/jupyter/environment.scm (%vcs-web-views): Change URL for Savannah
commit logs.

* guix-jupyter-kernel.scm (reply-execute-request): Wrap
'create-environment' calls in 'guard' and send a proper HTML reply upon
'package-not-found-error?' and 'output-not-found-error?'.
* guix/jupyter/environment.scm (&environment-error)
(&package-not-found-error, &output-not-found-error): Export accessors.

Previously we'd end up with an uncaught exception.

* guix-jupyter-kernel.scm (handle-download): Wrap
'base16-string->bytevector' in 'false-if-exception'.

Until now, ";;guix d<TAB>" would always return the whole list of magic
commands instead of returning just "describe" and "download".

* guix-jupyter-kernel.scm (reply-complete-request): Filter
%MAGIC-COMMANDS whose prefix is COMMAND.

* guix-jupyter-kernel.scm (reply-execute-request): Use
'cached-channel-instance' instead of 'inferior-for-channels'.  Use
'with-build-progress-report'.

* guix/jupyter/kernel.scm (sxml->html-string, build-event-reporter)
(call-with-build-progress-report): New procedures.
(with-build-progress-report): New macro.
* guix-jupyter-kernel.scm (create-environment): Use
'with-build-progress-report'.
<top level>: Add call to 'set-build-options'.

* guix-jupyter-kernel.scm (search-inferior-packages)
(reply-search-results): New procedures.
(reply-execute-request): Handle ";;guix search".
(%magic-commands): Add "search".
* README.org (Searching for packages): New section.

* guix/jupyter/kernel.scm (module-to-import?): Exclude (guix config).
(spawn-kernel/container): Provide (guix config) via 'make-config.scm'.

* guix-jupyter-kernel.scm (channels->shtml): Move heading to...
(reply-for-channels): ... here.
(reply-channel-description): New procedure.
(reply-execute-request): Handle ";;guix describe".
(%magic-commands): Add "describe".

This is a followup to 33be53fe.

* guile.am (.scm.go): Use '-L' instead of './env'.
* Makefile.am (AM_TESTS_ENVIRONMENT): Remove 'abs_top_srcdir' variable.
(SCM_LOG_DRIVER): Use '-L' and '-C' instead of './env'.

* guix-jupyter-kernel.scm (reply-for-channels): Add #:profile parameter
and honor it.
(reply-execute-request): Call 'inferior-eval' and pass #:profile to
'reply-for-channels'.

* guix/jupyter/environment.scm (open-default-inferior): Don't call
'open-inferior' on the result of 'inferior-for-channels'.

* env.in: Remove.
* pre-inst-env.in: New file.
* configure.ac: Build 'pre-inst-env'.
* README.org (Using the kernel prior to installation): Document './pre-inst-env'.

* environment.scm <propagated-inputs>: Update to GUILE-JSON-4.
* jupyter/json.scm: Use (json parser) instead of (json).  Explain the
difference with what Guile-JSON provides.
* guix-jupyter-kernel.scm: Use (json parser) and (json builder) instead
of (json).
* guix/jupyter/kernel.scm: Likewise.
* guix/jupyter/proxy.scm: Likewise.
* jupyter/guile.scm: Likewise.
* jupyter/kernels.scm: Likewise.
* jupyter/messages.scm: Likewise.
* jupyter/servers.scm: Likewise.
* tests/guile.scm: Likewise.
* tests/kernels.scm: Likewise.
* tests/servers.scm: Likewise.
* configure.ac: Check for (json parser) rather than JSON.

* guix-jupyter-kernel.scm <top level>: Log kernel startup.

* configure.ac: Check for Guile 3.0.
* environment.scm <arguments, inputs>: Adjust accordingly.

* guix/jupyter/environment.scm (%vcs-web-views): New variable.
(channel-commit-hyperlink): New procedure.
* guix-jupyter-kernel.scm (channels->shtml): Use it.

* README.org: Add SWH badge.

* .gitlab-ci.yml: New file.

* README.org: Add link to the blog post.