Make scripts in scripts/ workable with new directory locations

scripts/commit_changed_repos.sh

 #!/bin/bash
 
-for dir in $(ls packages);
+CACHE_PATH=${XDG_CACHE_HOME+"~/.cache"}
+PACKAGES_PATH=$CACHE_PATH/ros-aur-helper/packages
+
+for dir in $(ls $PACKAGES_PATH);
 do
-    cd packages/$dir
+    cd $PACKAGES_PATH/$dir
     if git status | grep -q '.SRCINFO'; then
         git add .SRCINFO PKGBUILD
         git commit -m "Updated package"

scripts/correct_arch_array.sh

 #!/bin/zsh
 
-for i in `ls packages`;
+CACHE_PATH=${XDG_CACHE_HOME+"~/.cache"}
+PACKAGES_PATH=$CACHE_PATH/ros-aur-helper/packages
+
+for i in $(ls $PACKAGES_PATH);
 do
 	if pacman -Si $i | egrep -q 'cpp|boost'; then
 		echo "$i contains c++ code"
-		if ! grep "('any')" packages/$i/PKGBUILD; then
+		if ! grep "('any')" $PACKAGES_PATH/$i/PKGBUILD; then
 			echo "$i already has a correct arch=() array"
 			continue;
 		fi
-		cd packages/$i
+		cd $PACKAGES_PATH/$i
 		sed -i "s/arch=('any')/arch=('i686' 'x86_64' 'aarch64' 'armv7h' 'armv6h')/g" PKGBUILD
 		grep "pkgrel" PKGBUILD | IFS="=" read -r name value
 		(( pkgrel = $value + 1 ))

scripts/delete_unnecessary_cmake_flags.sh

 #!/bin/zsh
 
-for i in `ls packages`;
+CACHE_PATH=${XDG_CACHE_HOME+"~/.cache"}
+PACKAGES_PATH=$CACHE_PATH/ros-aur-helper/packages
+
+for i in $(ls $PACKAGES_PATH);
 do
-    if grep 'DPYTHON_LIBRARY' packages/$i/PKGBUILD; then
+    if grep 'DPYTHON_LIBRARY' $PACKAGES_PATH/$i/PKGBUILD; then
         echo "$i has unnecessary cmake args"
-        cd packages/$i
+        cd $PACKAGES_PATH/$i
         sed -i '/-DPYTHON_BASENAME/d' PKGBUILD
         sed -i '/-DPYTHON_LIBRARY/d' PKGBUILD
         sed -i '/-DPYTHON_INCLUDE_DIR/d' PKGBUILD

scripts/fix-eigen.sh

 #!/bin/zsh
 
-for i in `ls packages`;
+CACHE_PATH=${XDG_CACHE_HOME+"~/.cache"}
+PACKAGES_PATH=$CACHE_PATH/ros-aur-helper/packages
+
+for i in $(ls $PACKAGES_PATH);
 do
-	if grep 'eigen3' packages/$i/PKGBUILD; then
+	if grep 'eigen3' $PACKAGES_PATH/$i/PKGBUILD; then
 		echo "$i depends on eigen3"
-		cd packages/$i
+		cd $PACKAGES_PATH/$i
 		sed -i "s/eigen3/eigen/g" PKGBUILD
 		grep "pkgrel" PKGBUILD | IFS="=" read -r name value
 		(( pkgrel = $value + 1 ))

scripts/fix-tbb.sh

 #!/bin/zsh
 
-for i in `ls packages`;
+CACHE_PATH=${XDG_CACHE_HOME+"~/.cache"}
+PACKAGES_PATH=$CACHE_PATH/ros-aur-helper/packages
+
+for i in $(ls $PACKAGES_PATH);
 do
-	if grep 'intel-tbb' packages/$i/PKGBUILD; then
+	if grep 'intel-tbb' $PACKAGES_PATH/$i/PKGBUILD; then
 		echo "$i depends on intel-tbb"
-		cd packages/$i
+		cd $PACKAGES_PATH/$i
 		sed -i "s/intel-tbb/tbb/g" PKGBUILD
 		grep "pkgrel" PKGBUILD | IFS="=" read -r name value
 		(( pkgrel = $value + 1 ))

scripts/set-python3.sh

 #!/bin/zsh
 
-for i in `ls packages`;
+CACHE_PATH=${XDG_CACHE_HOME+"~/.cache"}
+PACKAGES_PATH=$CACHE_PATH/ros-aur-helper/\$PACKAGES_PATH
+
+for i in $(ls $PACKAGES_PATH);
 do
-	if grep '/bin/python2' packages/$i/PKGBUILD; then
+	if grep '/bin/python2' $PACKAGES_PATH/$i/PKGBUILD; then
 		echo "$i links against python2"
-		cd packages/$i
+		cd $PACKAGES_PATH/$i
 		sed -i "s!/bin/python2!/bin/python3!g" PKGBUILD
 		sed -i "s/-v 2/-v 3/g" PKGBUILD
 		grep "pkgrel" PKGBUILD | IFS="=" read -r name value