scripts/template_dir: re-use common prompting code

Author: alexeicolin

scripts/template_dir

@@ -131,15 +131,10 @@ do_zephyrrc()
 	echo "     export ZEPHYR_SDK_INSTALL_DIR=$target_sdk_dir"
 	echo
 	if [ -z "$rc_confirm" ]; then
-		echo "Update/Create $HOME/.zephyrrc with environment variables setup for you (y/n)? "
-		while read rc_confirm; do
-			[ "$rc_confirm" = "Y" -o "$rc_confirm" = "y" \
-			-o "$rc_confirm" = "n" \
-			-o "$rc_confirm" = "N" ] && break
-			echo "Invalid input \"$rc_confirm\", please input 'y' or 'n': "
-		done
+		prompt "creating/updating $HOME/.zephyrrc with environment variables setup for you "
+		rc_confirm=$answer
 	fi
-	if [ "$rc_confirm" = "y" -o "$rc_confirm" = "Y" ]; then
+	if [ "$rc_confirm" = "y" ]; then
 		if [ -f $HOME/.zephyrrc ]; then
 			sed -i "s#ZEPHYR_SDK_INSTALL_DIR=.*#ZEPHYR_SDK_INSTALL_DIR=${target_sdk_dir}#" $HOME/.zephyrrc
 			sed -i "s#ZEPHYR_TOOLCHAIN_VARIANT=.*#ZEPHYR_TOOLCHAIN_VARIANT=zephyr#" $HOME/.zephyrrc
@@ -163,8 +158,8 @@ do_cmake_package()
 			return
 		fi
 
-		read_confirm "registering Zephyr-sdk CMake module with path $target_sdk_dir "
-		if [ "$confirm" = "y" -o "$confirm" = "Y" ]; then
+		query "registering Zephyr-sdk CMake module with path $target_sdk_dir "
+		if [ "$answer" = "y" ]; then
 			if [ ! -d $ZEPHYR_SDK_REGISTRY_DIR ]; then
 				mkdir -p $ZEPHYR_SDK_REGISTRY_DIR
 			fi
@@ -176,17 +171,28 @@ do_cmake_package()
 
 # Read the input "y"
 # $1 is optional, but allows the caller to provide additional text.
-read_confirm () {
-  if [ "$confirm" != "y" ]; then
-      echo "Do you want to continue $1(y/n)? "
-      while read confirm; do
-          [ "$confirm" = "Y" -o "$confirm" = "y" -o "$confirm" = "n" \
-            -o "$confirm" = "N" ] && break
-          echo "Invalid input \"$confirm\", please input 'y' or 'n': "
-      done
-  else
-      echo
-  fi
+prompt () {
+	echo "Do you want to continue $1(y/n)? "
+	while read answer; do
+		if [ "$answer" = "Y" -o "$answer" = "y" ]; then
+			answer="y"
+			break
+		elif [ "$answer" = "N" -o "$answer" = "n" ]; then
+			answer="n"
+			break
+		else
+			echo "Invalid input \"$answer\", please input 'y' or 'n': "
+		fi
+	done
+}
+# Like prompt, but only if prompts were not pre-answered by -y argument
+query () {
+	if [ "$confirm" != "y" ]; then
+		prompt "$1"
+	else
+		answer="y"
+		echo
+	fi
 }
 
 verify_os
@@ -261,8 +267,8 @@ if [    "$sdk_dirname" != "/opt" \
 	echo Note: The version number \'-$SDK_VERSION\' can be omitted.
 	echo
 
-	read_confirm "installing to ${target_sdk_dir} "
-	if [ "$confirm" = "n" -o "$confirm" = "N" ]; then
+	query "installing to ${target_sdk_dir} "
+	if [ "$answer" = "n" ]; then
 		# Abort the installation
 		echo "SDK installation aborted!"
 		exit 1
@@ -282,8 +288,8 @@ if [ -d $target_sdk_dir ]; then
 		# wipe the directory first
 		if [ -d $target_sdk_dir/sysroots ]; then
 			echo "The directory $target_sdk_dir/sysroots will be removed! "
-			read_confirm
-			if [ "$confirm" = "y" -o "$confirm" = "Y" ]; then
+			query
+			if [ "$answer" = "y" ]; then
 		        	rm -rf $target_sdk_dir/sysroots/
 				rm -rf $target_sdk_dir/info-zephyr-sdk*/
 				rm -fr $target_sdk_dir/sdk_version