Refactor install logic, use file-based overrides per OS/distro

box_setup.sh

@@ -2,44 +2,52 @@
 
 [[ $1 = "--help" ]] && {
     echo "\nusage: ./box_setup.sh [system-type]"
-    echo "\nsystem-type options: work"
-    echo "\nexamples:\n    ./box_setup.sh\n    ./box_setup.sh work\n"
+    echo "\nsystem-type options: music_studio, programming"
+    echo "\nexamples:\n    ./box_setup.sh\n    ./box_setup.sh music_studio\n"
     exit 0
 }
 
 echo "---- settings vars for system type -----"
 
-# determine OS and, if linux, distro
-[[ "$OSTYPE" = *"darwin"* ]] && setup_os="macos" || {
-    [[ "$OSTYPE" = *"linux"* ]] && setup_os="linux" && {
+# determine OS and distro
+case "$OSTYPE" in
+    (*linux*)
+        setup_os="linux"
         [[ -f /etc/os-release ]] && . /etc/os-release
         setup_distro=$(echo "${NAME%% *}" | tr '[:upper:]' '[:lower:]')
-        [[ -z "$setup_distro" ]] && echo "OS: linux; distro not detected" && exit 1
-    }
-}
-[[ -z "$setup_os" ]] && echo "OS not detected" && exit 1
+        ;;
+    (*darwin*)
+        setup_os="macos"
+        setup_distro="macos" # just repeat macos, but maybe there is some better value
+        ;;
+esac
+
+# ensure OS and distro are set before proceeding
+[[ -z "$setup_os" ]] && echo "setup OS not detected" && exit 1
+[[ -z "$setup_distro" ]] && echo "setup distro not detected" && exit 1
 
 # set package manager commands for installs
-[[ "$setup_os" = "macos" ]] && {
-    install_cmd="brew install"
-    update_pkg_manager_and_defs_cmd='brew update'
-    update_pkgs_cmd='brew upgrade'
-} || {
-    [[ "$setup_os" = "linux" ]] && {
+case "$setup_os" in
+    (linux)
         case $setup_distro in
             (arch | artix)
                 install_cmd="sudo pacman -S --noconfirm"
                 update_pkg_manager_and_defs_cmd='' # don't; update system instead
                 update_pkgs_cmd='sudo pacman -Syu'
-        	;;
+                ;;
             (debian)
                 install_cmd="sudo apt install"
                 update_pkg_manager_and_defs_cmd='sudo apt update'
                 update_pkgs_cmd='sudo apt upgrade'
-        	;;
+                ;;
         esac
-    }
-}
+        ;;
+    (macos)
+        install_cmd="brew install"
+        update_pkg_manager_and_defs_cmd='brew update'
+        update_pkgs_cmd='brew upgrade'
+        ;;
+esac
 
 # export vars for scripts
 export BOX_SETUP_OS="$setup_os"