chore: add loading indicator when generating freezed file (#5978)

frontend/scripts/code_generation/freezed/generate_freezed.sh

@@ -75,6 +75,21 @@ if [ "$exclude_packages" = false ]; then
   cd ..
 fi
 
+# Function to display animated loading text
+display_loading() {
+  local pid=$1
+  local delay=0.5
+  local spinstr='|/-\'
+  while [ "$(ps a | awk '{print $1}' | grep $pid)" ]; do
+    local temp=${spinstr#?}
+    printf " [%c] Generating freezed files..." "$spinstr"
+    local spinstr=$temp${spinstr%"$temp"}
+    sleep $delay
+    printf "\r"
+  done
+  printf "                                   \r"
+}
+
 # Navigate to the appflowy_flutter directory and generate files
 echo "🧊 Start generating freezed files (AppFlowy)."
 
@@ -86,13 +101,28 @@ if [ "$skip_pub_packages_get" = false ]; then
   fi
 fi
 
+# Start the build_runner in the background
 if [ "$verbose" = true ]; then
-  dart run build_runner build -d
+  dart run build_runner build -d &
 else
-  dart run build_runner build >/dev/null 2>&1
+  dart run build_runner build >/dev/null 2>&1 &
 fi
 
-# Return to the original directory
+# Get the PID of the background process
+build_pid=$!
+
+# Start the loading animation
+display_loading $build_pid &
+
+# Get the PID of the loading animation
+loading_pid=$!
+
+# Wait for the build_runner to finish
+wait $build_pid
+
+# Clear the line
+printf "\r%*s\r" $(($(tput cols))) ""
+
 cd "$original_dir"
 
 echo "🧊 Done generating freezed files."