Add logic to identify system pm

src/nester/core/opinionated/exceptions.py

@@ -2,5 +2,10 @@
 
 
 class UnsupportedLanguageException(Exception):
+    """
+    This exception is raised, whenever the user tries to use opinionated creation for a language that does not
+    support this feature.
+    """
+
     def __str__(self) -> str:
         return "\033[91mError: The chosen language is not supported for opinionated creation!\033[0m"

src/nester/core/opinionated/opinionated_creation.py

@@ -94,7 +94,12 @@ def install_build_system(language: str) -> None:
     match language:
         case "py":
             for tool in supported_tools.py_build:
-                subprocess.run(["pip", "install", tool])
+                try:
+                    subprocess.run(["pip", "install", tool])
+                except subprocess.CalledProcessError:
+                    print(
+                        "\033[91mError: Pip does not seem to be installed on your system. Install it and try again.\033[0m"
+                    )
         case _:
             raise exceptions.UnsupportedLanguageException
 

src/nester/core/opinionated/supported_tools.py

@@ -2,3 +2,5 @@
 
 py_build = ["setuptools", "setuptools-scm", "wheel"]
 py_linters = ["black", "isort", "pylint"]
+
+package_managers = ["zypper", "apt", "dnf"]

src/nester/core/opinionated/utils.py

@@ -0,0 +1,23 @@
+"""
+This module provides support functionality for the opinionated creation module.
+"""
+
+import subprocess
+
+from . import supported_tools
+
+
+def identify_package_manager() -> str:
+    """
+    Identify which distribution's package manager is installed via trial and error.
+
+    :return: The name of the package manager to be used to install dependencies.
+    :rtype: str
+    """
+    for pm in supported_tools.package_managers:
+        try:
+            subprocess.run(pm)
+        except subprocess.CalledProcessError:
+            continue
+        return pm
+    return ""