Updated setup script (chatgpt-aided)

setup.sh

@@ -1,18 +1,54 @@
 #!/bin/bash
 
-if [ $1 == "--gentmpl" ]; then
+install_packages_managed() {
+    packages=("python3-dotenv" "python3-requests" "python3-lxml")
+    sudo apt install "${packages[@]}"
+}
+
+install_packages_unmanaged() {
+    # General packages
+    general_packages=("python-dotenv")
+
+    # Stasher packages
+    stasher_packages=("requests" "lxml" "python-dotenv")
+
+    pip3 install "${general_packages[@]}"
+    pip3 install "${stasher_packages[@]}"
+}
+
+print_usage() {
+    echo "Usage: $0 [OPTIONS]"
+    echo "Options:"
+    echo "  --gentmpl       Generate .env template"
+    echo "  --managed       Install managed python packages"
+    echo "  --unmanaged     Install unmanaged python packages"
+}
+
+while getopts ":h" opt; do
+    case $opt in
+        h)
+            print_usage
+            exit 0
+            ;;
+        \?)
+            echo "Invalid option: -$OPTARG"
+            print_usage
+            exit 1
+            ;;
+    esac
+done
+
+shift $((OPTIND - 1))
+
+if [[ $1 == "--gentmpl" ]]; then
     grep "[A-Z_ ]*=" .env -o > env-template.txt
     exit 0
-elif [ ! -z "$1" ]; then
-	echo "Unrecognised parameter, use --gentmpl to generate .env template"
+elif [[ $1 == "--managed" ]]; then
+    install_packages_managed
+elif [[ $1 == "--unmanaged" ]]; then
+    install_packages_unmanaged
+else
+    echo "Unrecognized parameter."
+    print_usage
     exit 1
 fi
-
-# Installs prerequisites for some of the system scripts
-# Redundant package names are acceptable as this improves readability
-
-# General
-python -m pip install python-dotenv
-
-# Stasher
-python -m pip install requests lxml python-dotenv