Add script to parse dependencies from pyproject.toml

NOTE: this was created in order to facilitate the project setup using
Python 2 🐍🪦 but is currently UNUSED as this opens Pandora's box 🪤 of
versions specified via 🎭 Poetry but incompatible with Python 2 etc.

Author: ehrenfeu

.github/workflows/pytest-python2.yml

@@ -25,7 +25,9 @@ jobs:
     - name: 🗃 Cache 📦 APT Packages
       uses: awalsh128/cache-apt-pkgs-action@v1.4.3
       with:
-        packages: xmlstarlet
+        packages:
+          xmlstarlet
+          # python3-tomli  # required only for 'parse-python-deps.py'
         version: 1.0
 
     - name: 🗃 Cache pyenv installation

scripts/parse-python-deps.py

@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+
+"""Parse project dependencies and format them for usage with `pip install`."""
+
+# NOTE: requires Ubuntu package 'python3-tomli' to be installed!
+
+import tomli
+
+with open("pyproject.toml", "rb") as tomlfile:
+    pyproject = tomli.load(tomlfile)
+
+deps_pkg = pyproject["tool"]["poetry"]["dependencies"]
+deps_dev = pyproject["tool"]["poetry"]["group"]["dev"]["dependencies"]
+
+output = ""
+
+for deps in deps_pkg, deps_dev:
+    for pkg, ver in deps.items():
+        if ver[0] == "^":
+            ver = f">={ver[1:]}"
+        output = f'{output} {pkg}{ver}'
+
+print(output)