feat(cli): read environ variable for verbosity (#63)

* feat(cli): read environ variable for verbosity

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

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

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

.github/workflows/pages.yml

@@ -37,7 +37,7 @@ jobs:
       - name: Setup Pages
         uses: actions/configure-pages@v2
       - name: Install Linux Dependencies
-        run: sudo apt install libcairo2-dev libpango1.0-dev ffmpeg freeglut3-dev 
+        run: sudo apt install libcairo2-dev libpango1.0-dev ffmpeg freeglut3-dev
       - name: Install Python dependencies
         run: pip install manim sphinx sphinx_click furo
       - name: Install local Python package

.github/workflows/test_examples.yml

@@ -8,6 +8,7 @@ name: Test Examples
 
 env:
   QT_QPA_PLATFORM: offscreen
+  MANIM_SLIDES_VERBOSITY: debug
 
 jobs:
   build-examples:

manim_slides/commons.py

@@ -56,5 +56,7 @@ def verbosity_option(function: Callable) -> Callable:
         help="Verbosity of CLI output",
         default=None,
         expose_value=False,
+        envvar="MANIM_SLIDES_VERBOSITY",
+        show_envvar=True,
         callback=callback,
     )(function)