Install Pluto.jl and jupyter-pluto-proxy (#1929)

* Install Pluto.jl and jupyter-pluto-proxy

[Pluto.jl](https://plutojl.org/) is an alternative reactive notebook
frontend focused specifically on Julia. I think shipping this
by default in the julia-enabled images helps serve the Julia
community better, particularly when used with JupyterHub.

For context, I am working with the Julia users of the
[Jupyter Meets the Earth](https://jupytearth.org/) project, and
trying to understand how to best serve their needs on a JupyterHub.
We currently maintain a massive image that 'has everything', but
I'm trying to instead work upstream wherever possible so everyone
working in these subfields can benefit. Meeting Julia users where
they are at seems a useful path forward here.

* Add note about Pluto.jl to selecting.md

* Default to replacing - with _ in package imports

* Add jupyter-pluto-proxy to package import mapping

* Add Pluto.jl to datascience-notebook image

* Add test for pluto proxy starting correctly

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update test_packages.py

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Ayaz Salikhov <mathbunnyru@users.noreply.github.com>

docs/using/selecting.md

@@ -118,6 +118,8 @@ It contains:
 - Everything in `jupyter/minimal-notebook` and its ancestor images
 - The [Julia Programming Language](https://julialang.org/)
 - [IJulia](https://github.com/JuliaLang/IJulia.jl) to support Julia code in Jupyter notebook
+- [Pluto.jl](https://plutojl.org/) reactive Julia notebook interface, made accessible with [jupyter-pluto-proxy](https://github.com/yuvipanda/jupyter-pluto-proxy)
+- [HDF5](https://github.com/JuliaIO/HDF5.jl) package
 
 ### jupyter/scipy-notebook
 
@@ -188,6 +190,7 @@ communities.
 - [rpy2](https://rpy2.github.io/doc/latest/html/index.html) package
 - The [Julia](https://julialang.org/) compiler and base environment
 - [IJulia](https://github.com/JuliaLang/IJulia.jl) to support Julia code in Jupyter notebooks
+- [Pluto.jl](https://plutojl.org/) reactive Julia notebook interface, made accessible with [jupyter-pluto-proxy](https://github.com/yuvipanda/jupyter-pluto-proxy)
 - [HDF5](https://github.com/JuliaIO/HDF5.jl) package
 
 ### jupyter/pyspark-notebook

minimal-notebook/setup-scripts/setup-julia-packages.bash

@@ -11,7 +11,8 @@ import Pkg;
 Pkg.update();
 Pkg.add([
     "HDF5",
-    "IJulia"
+    "IJulia",
+    "Pluto"
 ]);
 Pkg.precompile();
 '
@@ -23,3 +24,10 @@ mv "${HOME}/.local/share/jupyter/kernels/julia"* "${CONDA_DIR}/share/jupyter/ker
 chmod -R go+rx "${CONDA_DIR}/share/jupyter"
 rm -rf "${HOME}/.local"
 fix-permissions "${JULIA_PKGDIR}" "${CONDA_DIR}/share/jupyter"
+
+# Install jupyter-pluto-proxy to get Pluto to work on JupyterHub
+mamba install --yes \
+    'jupyter-pluto-proxy' && \
+    mamba clean --all -f -y && \
+    fix-permissions "${CONDA_DIR}" && \
+    fix-permissions "/home/${NB_USER}"

tests/base-notebook/test_packages.py

@@ -52,6 +52,7 @@ LOGGER = logging.getLogger(__name__)
 PACKAGE_MAPPING = {
     # Python
     "beautifulsoup4": "bs4",
+    "jupyter-pluto-proxy": "jupyter_pluto_proxy",
     "matplotlib-base": "matplotlib",
     "pytables": "tables",
     "scikit-image": "skimage",

tests/datascience-notebook/test_julia_starts.py

@@ -0,0 +1,32 @@
+import logging
+import secrets
+import time
+
+import requests
+
+from tests.conftest import TrackedContainer, find_free_port
+
+LOGGER = logging.getLogger(__name__)
+
+
+def test_pluto_proxy(
+    container: TrackedContainer, http_client: requests.Session
+) -> None:
+    """Pluto proxy starts Pluto correctly"""
+    host_port = find_free_port()
+    token = secrets.token_hex()
+    container.run_detached(
+        command=[
+            "start.sh",
+            "jupyter",
+            "lab",
+            "--port=8888",
+            f"--LabApp.token={token}",
+        ],
+        ports={"8888/tcp": host_port},
+    )
+    # Give the server a bit of time to start
+    time.sleep(3)
+    resp = http_client.get(f"http://localhost:{host_port}/pluto?token={token}")
+    resp.raise_for_status()
+    assert "Pluto.jl notebooks" in resp.text, "Pluto.jl text not found in /pluto page"

tests/julia-notebook/test_pluto.py

@@ -0,0 +1,32 @@
+import logging
+import secrets
+import time
+
+import requests
+
+from tests.conftest import TrackedContainer, find_free_port
+
+LOGGER = logging.getLogger(__name__)
+
+
+def test_pluto_proxy(
+    container: TrackedContainer, http_client: requests.Session
+) -> None:
+    """Pluto proxy starts Pluto correctly"""
+    host_port = find_free_port()
+    token = secrets.token_hex()
+    container.run_detached(
+        command=[
+            "start.sh",
+            "jupyter",
+            "lab",
+            "--port=8888",
+            f"--LabApp.token={token}",
+        ],
+        ports={"8888/tcp": host_port},
+    )
+    # Give the server a bit of time to start
+    time.sleep(3)
+    resp = http_client.get(f"http://localhost:{host_port}/pluto?token={token}")
+    resp.raise_for_status()
+    assert "Pluto.jl notebooks" in resp.text, "Pluto.jl text not found in /pluto page"