add definitions of markdown badges

test_notebooks.py

@@ -90,7 +90,28 @@ def test_jetbrains_bug_py_66491(notebook_filename):
     !pip --quiet install open-atmos-jupyter-utils
     from open_atmos_jupyter_utils import pip_install_on_colab
     pip_install_on_colab('PySDM-examples')"""
-
+
+def _relative_path(absolute_path):
+    return os.path.relpath(
+        absolute_path,
+        pathlib.Path(__file__).parent.parent.parent.absolute()
+    )
+
+def _nbviewer_badge_markdown(absolute_path):
+    svg_badge_url = "https://raw.githubusercontent.com/jupyter/design/master/logos/Badges/nbviewer_badge.svg"
+    link = f"https://nbviewer.jupyter.org/github/open-atmos/PySDM/blob/main/{_relative_path(absolute_path)}"
+    return f"[![preview in nbviewer]({svg_badge_url})]({link})"
+
+def _mybinder_badge_markdown(abslute_path):
+    svg_badge_url = "https://mybinder.org/badge_logo.svg"
+    link = f"https://mybinder.org/v2/gh/open-atmos/PySDM.git/main?urlpath=lab/tree/{_relative_path(abslute_path)}"
+    return f"[![launch on mybinder.org]({svg_badge_url})]({link})"
+
+def _colab_badge_markdown(absolute_path):
+    svg_badge_url = "https://colab.research.google.com/assets/colab-badge.svg"
+    link = f"https://colab.research.google.com/github/open-atmos/PySDM/blob/main/{_relative_path(absolute_path)}"
+    return f"[![launch on Colab]({svg_badge_url})]({link})"
+
 def test_first_cell_contains_three_badges(notebook):
     """ checks if all notebooks feature nbviewer, mybinder and Colab badges (in the first cell) """
     with open(notebook) as fp: