Update alpine-install.func

add spinner

misc/alpine-install.func

@@ -34,6 +34,8 @@ catch_errors() {
 }
 
 error_handler() {
+  if [ -n "$SPINNER_PID" ] && ps -p $SPINNER_PID > /dev/null; then kill $SPINNER_PID; fi
+  printf "\e[?25h"
   local exit_code="$?"
   local line_number="$1"
   local command="$2"
@@ -41,17 +43,37 @@ error_handler() {
   echo -e "\n$error_message\n"
 }
 
+# This function displays a spinner.
+spinner() {
+  printf "\e[?25l"
+  spinner="/-\\|/-\\|"
+  spin_i=0
+  while true; do
+    printf "\b%s" "${spinner:spin_i++%${#spinner}:1}"
+    sleep 0.1
+  done
+}
+
+# This function displays an informational message with a yellow color.
 msg_info() {
   local msg="$1"
-  echo -ne " ${HOLD} ${YW}${msg}..."
+  echo -ne " ${HOLD} ${YW}${msg}   "
+  spinner &
+  SPINNER_PID=$!
 }
 
+# This function displays a success message with a green color.
 msg_ok() {
+  if [ -n "$SPINNER_PID" ] && ps -p $SPINNER_PID > /dev/null; then kill $SPINNER_PID; fi
+  printf "\e[?25h"
   local msg="$1"
   echo -e "${BFR} ${CM} ${GN}${msg}${CL}"
 }
 
+# This function displays a error message with a red color.
 msg_error() {
+  if [ -n "$SPINNER_PID" ] && ps -p $SPINNER_PID > /dev/null; then kill $SPINNER_PID; fi
+  printf "\e[?25h"
   local msg="$1"
   echo -e "${BFR} ${CROSS} ${RD}${msg}${CL}"
 }