Make dotfiles.sh POSIX compliant

dotfiles.sh

@@ -1,19 +1,19 @@
-#!/bin/bash
+#!/bin/sh
 
-if [ "$(dirname $0)" != "." ]; then
+if [ "$(dirname "$0")" != "." ]; then
 	echo "Please run this script from the directory it resides."
 	exit
 fi
 
 PACKAGE_FILE="./packages"
 
-FILES=$(find . \( -path ./.git -o \
-		  -path ./dotfiles.sh -o \
-		  -path $PACKAGE_FILE -o \
-		  -path ./README.md -o \
-		  -path ./screenshot.png \) -prune -o -type f -print)
+FILES="$(find . \( -path ./.git -o \
+	-path ./dotfiles.sh -o \
+	-path $PACKAGE_FILE -o \
+	-path ./README.md -o \
+	-path ./screenshot.png \) -prune -o -type f -print)"
 
-if [ "$1" == "help" ] || [ "$1" == "" ]; then
+help() {
 	B=$(tput bold)
 	N=$(tput sgr0)
 
@@ -46,73 +46,96 @@ ${B}COMMANDS${N}
 		Store the list of all the installed packages on the system.
 
 	${B}packages install${N}
-		Install all the core packages of the list.
+		Install all the core packages of the stored list.
 EOF
+}
 
-elif [ "$1" == "list" ]; then
+list() {
 	for f in $FILES; do
-		echo $f
+		echo "${f#??}"
 	done
+}
 
-elif [ "$1" == "get" ] && [ "$2" != "" ]; then
-	FILE=$(readlink -f $2)
-	FILE_CUT_HOME="$(echo $FILE | sed -nr 's/^\/home\/'$USER'\/(.*)$/\1/p')"
+get() {
+	if [ "$1" = "" ]; then
+		echo "Missing argument <filepath>"
+		return
+	fi
+
+	FILE=$(readlink -f "$1")
+	FILE_CUT_HOME="$(echo "$FILE" | sed -nr 's/^\/home\/'"$USER"'\/(.*)$/\1/p')"
 
 	# /home/<user>/
 	if [ -n "$FILE_CUT_HOME" ]; then
-		mkdir -p $(pwd)/$(dirname $FILE_CUT_HOME)
-		cp $FILE $(pwd)/$FILE_CUT_HOME
+		mkdir -p "$(pwd)/$(dirname "$FILE_CUT_HOME")"
+		cp "$FILE" "$(pwd)/$FILE_CUT_HOME"
 	# /
 	else
-		mkdir -p $(pwd)/$(dirname $FILE)
-		cp $FILE $(pwd)/$FILE
+		mkdir -p "$(pwd)/$(dirname "$FILE")"
+		cp "$FILE" "$(pwd)/$FILE"
+	fi
+}
+
+pullpush() {
+	if [ "$1" = "" ]; then
+		return
 	fi
 
-elif [ "$1" == "pull" ] || [ "$1" == "push" ]; then
 	for f in $FILES; do
 		# Remove the first character (.) from the string
-		f=${f:1}
+		f=${f#?}
 		# Resolved symbolic link
-		fr=$(readlink -f $f)
+		fr=$(readlink -f "$f")
 
 		# The filepath starts with '/boot/', '/etc/', '/usr/share/'
-		if [ -n "$(echo $fr | sed -nr 's/^(\/(boot|etc|usr\/share)\/).*$/\1/p')" ]; then
-			if [ "$1" == "pull" ]; then
-				sudo cp $fr $(pwd)/$fr
-			else
-				sudo cp $(pwd)/$fr $fr
+		if [ -n "$(echo "$fr" | sed -nr 's/^(\/(boot|etc|usr\/share)\/).*$/\1/p')" ]; then
+			if [ "$1" = "pull" ]; then
+				sudo cp "$fr" "$(pwd)/$fr"
+			elif [ "$1" = "push" ]; then
+				sudo cp "$(pwd)/$fr" "$fr"
 			fi
 		else
-			if [ "$1" == "pull" ]; then
+			if [ "$1" = "pull" ]; then
 				# cp /home/<user>/<file> /home/<user>/[<some dir>/]dotfiles/<file>
-				cp $HOME$f $(pwd)/$f
-			else
-				cp $(pwd)/$f $HOME$f
+				cp "$HOME$f" "$(pwd)/$f"
+			elif [ "$1" = "push" ]; then
+				cp "$(pwd)/$f" "$HOME$f"
 			fi
 		fi
 	done
+}
 
-elif [ "$1" == "packages" ]; then
-	PACKAGE_LIST=$(comm -23 <(pacman -Qeq | sort) <(pacman -Qgq base base-devel | sort))
+pull() {
+	pullpush "pull"
+}
 
-	if [  "$2" == "list" ] || [ "$2" == "" ]; then
+push() {
+	pullpush "push"
+}
+
+packages() {
+	PACKAGE_LIST="$(pacman -Qqe | sort | grep -vx "$(pacman -Qqg base base-devel | sort)")"
+
+	if [  "$1" = "list" ] || [ "$1" = "" ]; then
 		echo "$PACKAGE_LIST"
-	elif [ "$2" == "store" ]; then
+	elif [ "$1" = "store" ]; then
 		if [ ! -s $PACKAGE_FILE ]; then
 			touch "$PACKAGE_FILE"
 		else
 			truncate -s 0 "$PACKAGE_FILE"
 		fi
 		echo "$PACKAGE_LIST" > "$PACKAGE_FILE"
-	elif [ "$2" == "install" ]; then
+	elif [ "$1" = "install" ]; then
 		# Install core packages
-		sudo pacman -S --needed $(comm -12 <(pacman -Slq | sort) <(sort $PACKAGE_FILE))
+		sudo pacman -S --needed --noconfirm "$(cat "$PACKAGE_FILE")"
 		# For AUR packages, run: <helper> -S - < packages
 	fi
-else
-	echo "./dotfiles.sh: '$1' is not a dotfiles command. \
-See './dotfiles.sh help'."
+}
 
+if type "$1" 2> /dev/null | grep -q "function"; then
+	"$@"
+else
+	help
 fi
 
 # @Todo: