Minimalist, potentially dangerous, KSP mod managing script.

KMSS.sh

#!/usr/bin/env bash

# Kerbal Mods Shell Script
#
# by raffitz

# Default Vatiable Declaration:
DEFKMSSGAMEFOLDER="${HOME}/.local/share/Steam/steamapps/common/Kerbal Space Program"
DEFKMSSFOLDER="${HOME}/Documents/KMSS"

# Folders:
KMSSGAMEFOLDER="${KMSSGAMEFOLDER:-${DEFKMSSGAMEFOLDER}}"
KMSSFOLDER="${KMSSFOLDER:-${DEFKMSSFOLDER}}"
# Default values can be overriden by setting the environment variables before the script execution

# Check whether folders exist
if [[ ! -d "$KMSSGAMEFOLDER" ]]; then
	echo "No game folder present! Reconfigure script!"
	exit 1
else
	if [[ ! -d "$KMSSGAMEFOLDER/GameData" ]]; then
		echo "No GameData folder present! Reconfigure script!"
		exit 1
	elif [[ ! -d "$KMSSGAMEFOLDER/saves" ]]; then
		mkdir -p "$KMSSGAMEFOLDER/saves"
	fi
fi

if [[ ! -d "$KMSSFOLDER" ]]; then
	echo "No KMSS folder present. It will be created."
	mkdir -p "$KMSSFOLDER"
fi

if [[ ! -d "$KMSSFOLDER/Mods" ]]; then
	echo "No KMSS Mods folder present. It will be created."
	mkdir -p "$KMSSFOLDER/Mods"
fi

if [[ ! -d "$KMSSFOLDER/Backups" ]]; then
	echo "No KMSS Backups folder present. It will be created."
	mkdir -p "$KMSSFOLDER/Backups"
fi

if [[ ! -d "$KMSSFOLDER/Saves" ]]; then
	echo "No KMSS Saves folder present. It will be created."
	mkdir -p "$KMSSFOLDER/Saves"
fi

# Check validity of command:

function chckcmd(){
	if [[ "$1" = "clear" || \
		  "$1" = "add" || \
		  "$1" = "rmv" || \
		  "$1" = "toggle" || \
		  "$1" = "bak" || \
		  "$1" = "rst" || \
		  "$1" = "baksav" || \
		  "$1" = "rstsav" || \
		  "$1" = "quit"
		 ]]; then
		 return 0
	 else
		 return 1
	 fi
}
KMSSCOMMAND=$1

until chckcmd "$KMSSCOMMAND"; do

	printf "Kerbal Mods Shell Script\n\nby raffitz\n"
	printf "\n"
	printf "\tclear\tremove all mods\n"
	printf "\tadd\tadd mods\n"
	printf "\trmv\tremove mods\n"
	printf "\ttoggle\ttoggle mods on and off\n"
	printf "\n"
	printf "\tbak\tbackup mods\n"
	printf "\trst\trestore mods\n"
	printf "\n"
	printf "\tbaksav\tbackup saves\n"
	printf "\trstsav\trestore saves\n"
	printf "\n"
	printf "\tquit\tdo nothing and quit program\n"
	printf "\n"

	read -p ">" -r
	KMSSCOMMAND=$REPLY
done

# Run command:

case "$KMSSCOMMAND" in
	clear)
		read -p "Are you sure you want to clear all mods?" -r
		if [[ $REPLY =~ ^[Yy]$ ]];then
			cd "$KMSSGAMEFOLDER/GameData"
			files=$(ls -1)
			echo "${files/Squad/}" | grep . | while read line ; do rm "$line" ; done
		else
			exit 1
		fi
		;;
	add)
		printf "Available mods (in folder $KMSSFOLDER/Mods):\n"
		cd "$KMSSFOLDER/Mods"
		ls
		printf "Write the mod names above, one at a time, to add them.\nGibberish will exit\n"
		read -p ">" -r
		until [[ ! -d "$REPLY" ]]; do
			cp -r "$REPLY"/* "$KMSSGAMEFOLDER/GameData"
			read -p ">" -r
		done
		;;
	rmv)
		KMSSGD="$KMSSGAMEFOLDER/GameData"
		printf "Available mods (in folder $KMSSFOLDER/Mods):\n"
		cd "$KMSSFOLDER/Mods"
		ls
		printf "Write the mod names above, one at a time, to remove them.\nIf mod isn't installed, it won't be removed (evidently).\nGibberish will exit\n" 
		read -p ">" -r
		until [[ ! -d "$REPLY" ]]; do
			cd $REPLY
			find . -type f | while read line ; do rm "${line/#./$KMSSGD}" ; done
			find . -type d | tail -n +2 | tac | while read line ; do rmdir --ignore-fail-on-non-empty "${line/#./$KMSSGD}" ; done
			read -p ">" -r
		done
		;;
	toggle)
		if [[ -d "$KMSSFOLDER/Backups/Toggle" ]]; then
			echo "Restoring mods"
			cd "$KMSSFOLDER/Backups/Toggle"
			mv ./* "$KMSSGAMEFOLDER/GameData"
			cd ..
			rmdir "$KMSSFOLDER/Backups/Toggle"
		else
			echo "Storing mods"
			mkdir -p "$KMSSFOLDER/Backups/Toggle"
			cd "$KMSSGAMEFOLDER/GameData"
			files=$(ls -1)
			echo "${files/Squad/}" | grep . | while read line ; do mv "$line" "$KMSSFOLDER/Backups/Toggle"; done
		fi
		;;
	bak)
		KMSSBUNAME="$(date +%Y%m%d%H%M)"
		printf "Mods will be backed up.\nBackup name [$KMSSBUNAME] :"
		read -r
		KMSSBUNAME="${REPLY:-$KMSSBUNAME}"
		mkdir -p "$KMSSFOLDER/Backups/$KMSSBUNAME"
		cd "$KMSSGAMEFOLDER/GameData"
		files=$(ls -1)
		echo "${files/Squad/}" | grep . | while read line ; do cp -r "$line" "$KMSSFOLDER/Backups/$KMSSBUNAME"; done
		;;
	rst)
		printf "Available Backups (in folder $KMSSFOLDER/Backups):\n"
		cd "$KMSSFOLDER/Backups"
		ls
		printf "Write the backup name to restore it.\n"
		until [[ -d "$REPLY" ]]; do
			read -p ">" -r
		done
		cp -r "$REPLY"/* "$KMSSGAMEFOLDER/GameData"
		;;
	baksav)
		KMSSBUNAME="$(date +%Y%m%d%H%M)"
		printf "Saves will be backed up.\nBackup name [$KMSSBUNAME] :"
		read -r
		KMSSBUNAME="${REPLY:-$KMSSBUNAME}"
		cd "$KMSSGAMEFOLDER"
		cp -r saves "$KMSSFOLDER/Saves/$KMSSBUNAME"
		;;
	rstsav)
		printf "Available savegame backups (in folder $KMSSFOLDER/Saves):\n"
		cd "$KMSSFOLDER/Saves"
		ls
		printf "Write the backup name to restore it.\n"
		until [[ -d "$REPLY" ]]; do
			read -p ">" -r
		done
		read -p "Are you sure you want to override current savegames?" -r
		if [[ $REPLY =~ ^[Yy]$ ]];then
			rm -rf "$KMSSGAMEFOLDER/saves"
			cp -r "$KMSSFOLDER/Saves/$REPLY" "$KMSSGAMEFOLDER/saves"
		else
			exit 1
		fi
		;;
	quit)
		;;
	*)
		echo "Critical error: Unrecognised command!"
		exit 1
		;;
esac

exit