feat(cli): manim-slides checkhealth (#458)

* feat(cli): `manim-slides checkhealth`

Closes #457

* chore(fmt): auto fixes from pre-commit.com hooks

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

* chore(tests): implement some basic tests

* chore(docs): document changes

---------

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

manim_slides/__main__.py

@@ -5,6 +5,7 @@ import requests
 from click_default_group import DefaultGroup
 
 from .__version__ import __version__
+from .checkhealth import checkhealth
 from .convert import convert
 from .logger import logger
 from .present import list_scenes, present
@@ -63,6 +64,7 @@ def cli(notify_outdated_version: bool) -> None:
 
 
 cli.add_command(convert)
+cli.add_command(checkhealth)
 cli.add_command(init)
 cli.add_command(list_scenes)
 cli.add_command(present)

manim_slides/checkhealth.py

@@ -0,0 +1,39 @@
+import sys
+
+import click
+
+from .__version__ import __version__
+
+
+@click.command()
+def checkhealth() -> None:
+    """Check Manim Slides' installation."""
+    click.echo(f"Manim Slides version: {__version__}")
+    click.echo(f"Python executable: {sys.executable}")
+    click.echo("Manim bindings:")
+
+    click.echo(f"Modules: {sys.modules.keys()}")
+
+    try:
+        from manim import __version__ as manimce_version
+
+        click.echo(f"\tmanim (version: {manimce_version})")
+    except ImportError:
+        click.secho("\tmanim not found", bold=True)
+
+    try:
+        from manimlib import __version__ as manimlib_version
+
+        click.echo(f"\tmanimgl (version: {manimlib_version})")
+    except ImportError:
+        click.secho("\tmanimgl not found", bold=True)
+
+    try:
+        from qtpy import API, QT_VERSION
+
+        click.echo(f"Qt API: {API} (version: {QT_VERSION})")
+    except ImportError:
+        click.secho(
+            "No Qt API found, some Manim Slides commands will not be available",
+            bold=True,
+        )