Get and create, if requested, a directory or file name to store configuration files for scripts.

MyPersonalConfigs.sh

#!/bin/bash
#
# Get a directory name to store configuration files for my own scripts.
#
# The default directory will be '$XDG_CONFIG_HOME/MyPersonalConfigs,' or
# '$HOME/.config/MyPersonalConfigs' if $XDG_CONFIG_HOME is not defined.
#
# The 'MyPersonalConfigs' subdirectory is used to isolate configs from my own
# scripts from those of programs installed by the package manager.
#
#
# For examples on how this is used, see:
#
#  - https://github.com/olsonbg/dotfiles/blob/master/bin/feh_browser_window
#  - https://github.com/olsonbg/dotfiles/blob/master/bin/mdv
#  - https://github.com/olsonbg/dotfiles/blob/master/bin/vmprog
#
# Author: Brian G. Olson (https://www.github.com/olsonbg)
#
# Current version:
#     https://github.com/olsonbg/dotfiles/blob/master/bin/MyPersonalConfigs
#
# Released under GPLv3 (http://www.gnu.org/licenses/gpl.html)
#

CFGDIR="${XDG_CONFIG_HOME:-$HOME/.config}/MyPersonalConfigs"

checkdir() {
	local theDIR="$1"
	if [ -f "$theDIR" ]; then
		echo "Error: $theDIR is a file, should be a directory." >&2
		return 1
	fi

	[[ ! -e "${theDIR}" ]] && mkdir -p "$theDIR"

	echo "$theDIR"
}

checkfile() {
	local theFILE="$1"
	local TOUCH="$2"

	if [ -d "$theFILE" ]; then
		echo "Error: $theFILE is a directory, should be a file." >&2
		return 1
	fi

	[[ ! -e "${theFILE}" ]] && [[ -n "$TOUCH" ]] && touch "$theFILE"

	echo "$theFILE"
}

USAGE="Usage: $(basename "$0") [-f <name>] [-c] [-d <subdirectory name>]"

showhelp() {
	echo $USAGE >&2
	echo -e "\nReturns name of the configuration directory, or full path to the"
	echo -e "configuration file if -f option is used.\n"
	echo -e "-f <name> \tName of configuration file, it will not be created"
	echo -e "          \tunless the -c option is used.\n"
	echo -e "-c        \tIf -f is used, then touch the file if it does not"
	echo -e "          \talready exist.\n"
	echo -e "-d <name> \tSubdirectory of the configuration directory to use for"
	echo -e "          \tstoring configuration files. The subdirectory will be"
	echo -e "          \tcreated if it does not exist."
}

CFGFILE=""
CREATE=""
SUBDIR=""

while getopts "d:f:ch" OPTS; do
	case "$OPTS" in
		f)  CFGFILE="$OPTARG"
			;;
		d)  SUBDIR="$OPTARG"
			;;
		c)  CREATE="1"
			;;
		h)  showhelp
			exit 0
			;;
		*)  showhelp
			exit 1
			;;
	esac
done

R=$(checkdir "$CFGDIR") || exit 1

if [ -n "$SUBDIR" ]; then
	R=$(checkdir "$R/$SUBDIR") || exit 1
fi

if [ -n "$CFGFILE" ]; then
	R=$(checkfile "$R/$CFGFILE" "$CREATE") || exit 1
fi

echo $R