Manager: Improve option handling using GNU getopt

.local/completion/_dotfiles.sh

@@ -5,20 +5,20 @@ _dotfiles.sh() {
 	local -a args
 
 	args+=(
-		'(- *)'{-a,--add}'[add file to the dotfiles directory]:file:_files'
-		'(- *)'{-f,--files}'[display all files added to the dotfiles directory]'
-		'(- *)'{-h,--help}'[display usage message and exit]'
-		'(- *)'{-p,--packages}'[instal, list or store packages]:packages:((
+		'*'{-a,--add=}'[add file to the dotfiles directory]:file:_files'
+		'(-f --files)'{-f,--files}'[display all files added to the dotfiles directory]'
+		'(-)'{-h,--help}'[display usage message and exit]'
+		'(-p --packages)'{-p,--packages=}'[instal, list or store packages]:package functions:((
 			install\:"install all core packages of the stored list"
 			install-aur\:"install all AUR packages of the stored list"
 			list\:"display all packages installed on the system (default)"
 			store\:"stores a list of all installed packages"
 		))'
-		'(- *)'{-l,--pull}'[pull each added file from system to dotfiles directory]'
-		'(- *)'{-s,--push}'[push each added file to its location on the system]'
+		'(-l --pull)'{-l,--pull}'[pull each added file from system to dotfiles directory]'
+		'(-s --push)'{-s,--push}'[push each added file to its location on the system]'
 	)
 
-	_arguments $args[@] && ret=0
+	_arguments -s -S $args[@] && ret=0
 	return ret
 }
 

dotfiles.sh

@@ -1,7 +1,7 @@
 #!/bin/sh
 
 # Manages dotfiles and packages
-# Depends: pacman-contrib
+# Depends: GNU getopt, pacman-contrib
 
 # User-config---------------------------
 
@@ -20,7 +20,7 @@ AUR_HELPER="trizen"
 # --------------------------------------
 
 if [ "$(dirname "$0")" != "." ]; then
-	echo "Please run this script from the directory it resides."
+	echo "Please run this script from the directory it resides." >&2
 	exit 1
 fi
 
@@ -37,7 +37,7 @@ ${B}SYNOPSIS${N}
 	${B}./dotfiles.sh${N} ${U}OPTION${N} [${U}ARG${N}]
 
 ${B}OPTIONS${N}
-	${B}-a${N} ${U}FILE${N}, ${B}--add${N} ${U}FILE${N}
+	${B}-a${N} ${U}FILE${N}, ${B}--add${N}=${U}FILE${N}
 		Add file to the dotfiles directory.
 
 	${B}-f, --files${N}
@@ -46,7 +46,7 @@ ${B}OPTIONS${N}
 	${B}-h, --help${N}
 		Display usage message and exit.
 
-	${B}-p${N} [${U}FUNCTION${N}], ${B}--packages${N} [${U}FUNCTION${N}]
+	${B}-p${N} [${U}FUNCTION${N}], ${B}--packages${N}=[${U}FUNCTION${N}]
 		Apply ${U}FUNCTION${N} to the package manager packages.
 
 		${U}install${N}      Install all core packages of the stored list.
@@ -68,7 +68,7 @@ EOF
 }
 
 # Exit if no option is provided
-[ "$#" -eq 0 ] && help && exit 1
+[ "$#" -eq 0 ] && help >&2 && exit 1
 
 set_files() {
 	FILES="$(find . -type f -o -type l \
@@ -148,7 +148,7 @@ push() {
 
 packages() {
 	if ! pacman -Qqs pacman-contrib > /dev/null; then \
-		echo 'Please install the "pacman-contrib" dependency before running this option.'
+		echo 'Please install the "pacman-contrib" dependency before running this option.' >&2
 		exit 1
 	fi
 
@@ -182,60 +182,57 @@ packages() {
 	fi
 }
 
+# Option handling
 # --------------------------------------
 
-SCRIPT="$(basename "$0")"
+script="$(basename "$0")"
+options="$(getopt --options "ha:fp:ls" --longoptions "help,add:,files,packages:,pull,push" -n "$script" -- "$@" 2>&1)"
+result="$?"
 
-# $1 = -option, $2 message
-option_wrong() {
-	[ -z "$1" ] || [ -z "$2" ] && return 1
-
-	echo "$SCRIPT: $2 '$1'" >&2
-	echo "Try '$SCRIPT -h' or '$SCRIPT --help' for more information." >&2
+# Exit if invalid option is provided
+if [ "$result" -ne 0 ]; then
+	echo "$options" | head -n 1 >&2
+	echo "Try './$script --help' for more information." >&2
 	exit 1
-}
-
-# Get all the -options
-OPTIONS=$(echo "$@" | awk '{
-	for(i=1; i<=NF; i++) { if ($i ~ /^-/) printf "%s ", $i }
-}' | wc -w)
-
-# Check if -options are valid
-if [ "$OPTIONS" -gt 1 ]; then
-	LAST="$(echo "$@" | cut -d ' ' -f $#)"
-	option_wrong "$LAST" "option too many"
-elif [ "$#" -gt 2 ]; then
-	LAST="$(echo "$@" | cut -d ' ' -f $#)"
-	option_wrong "$LAST" "argument too many"
 fi
 
-OPT="$(echo "$* " | cut -d ' ' -f 1)"
-ARG="$(echo "$* " | cut -d ' ' -f 2)"
+eval set -- "$options"
 
-# Parse -options and call functions
-case $OPT in
+while true; do
+	case "$1" in
 		-a | --add)
-		add "$ARG" || option_wrong "$OPT" 'option requires an argument'
+			add "$2"
+			shift 2
 			;;
 		-f | --files)
 			list_files
+			shift
 			;;
 		-h | --help)
 			help
+			exit
 			;;
 		-p | --packages)
-		packages "$ARG"
+			packages "$2"
+			shift 2
 			;;
 		-l | --pull)
 			pull
+			shift
 			;;
 		-s | --push)
 			push
+			shift
+			;;
+		--)
+			shift
+			break
 			;;
 		*)
-		option_wrong "$OPT" 'invalid option'
+			break
 			;;
 	esac
+done
 
 # @Todo:
 # push function to push just one file