Bugfix: flet pack --distpath deletes dist directory (#2500)

* Bugfix: `flet pack --distpath` deletes `dist` directory
`flet pack --distpath DISTPATH` deletes "dist" directory even
when `DISTPATH` is specified. The solution is to ask the user whether
to delete the directories.

* Add non-interactive option to `flet pack` command.

sdk/python/packages/flet/src/flet/cli/commands/pack.py

@@ -114,17 +114,54 @@ def add_arguments(self, parser: argparse.ArgumentParser) -> None:
             action="store_true",
             help="Using this option creates a Manifest that will request elevation upon application start.(Windows)",
         )
+        parser.add_argument(
+            "-y",
+            "--yes",
+            dest="non_interactive",
+            default=False,
+            action="store_true",
+            help="Non-interactive mode.",
+        )
 
     def handle(self, options: argparse.Namespace) -> None:
+        is_dir_not_empty = lambda dir: os.path.isdir(dir) and len(os.listdir(dir)) != 0
+
         # delete "build" directory
         build_dir = os.path.join(os.getcwd(), "build")
-        if os.path.exists(build_dir):
-            shutil.rmtree(build_dir, ignore_errors=True)
+        if is_dir_not_empty(build_dir):
+            if options.non_interactive:
+                shutil.rmtree(build_dir, ignore_errors=True)
+            else:
+                delete_dir_prompt = input(
+                    f'Do you want to delete "build" directory? (y/n) '
+                )
+                if not delete_dir_prompt.lower() == "n":
+                    shutil.rmtree(build_dir, ignore_errors=True)
+                else:
+                    print('Failing... "build" directory must be empty to proceed.')
+                    exit(1)
+
+        # delete "dist" directory or DISTPATH directory
+        # if --distpath cli option is specified
+        if options.distpath:
+            dist_dir = os.path.join(os.getcwd(), options.distpath)
+        else:
+            dist_dir = os.path.join(os.getcwd(), "dist")
 
-        # delete "dist" directory
-        dist_dir = os.path.join(os.getcwd(), "dist")
-        if os.path.exists(dist_dir):
-            shutil.rmtree(dist_dir, ignore_errors=True)
+        if is_dir_not_empty(dist_dir):
+            if options.non_interactive:
+                shutil.rmtree(dist_dir, ignore_errors=True)
+            else:
+                delete_dir_prompt = input(
+                    f'Do you want to delete "{os.path.basename(dist_dir)}" directory? (y/n) '
+                )
+                if not delete_dir_prompt.lower() == "n":
+                    shutil.rmtree(dist_dir, ignore_errors=True)
+                else:
+                    print(
+                        f'Failing... DISTPATH "{os.path.basename(dist_dir)}" directory must be empty to proceed.'
+                    )
+                    exit(1)
 
         try:
             import PyInstaller.__main__