fix: check if script was called directly

main.py

@@ -5,7 +5,6 @@
 from readme_level import ReadmeLevel
 
 
-readme_instance: ReadmeLevel = ReadmeLevel()
 
 
 def draw_progress_bar() -> str:
@@ -31,25 +30,29 @@ def draw_progress_bar() -> str:
     return progress_bar
 
 
-user_level, to_next_lvl = itemgetter("current_level",
-                                     "percentage_level")(readme_instance.calc_current_level())
+if __name__ == "__main__":
 
-readme_path: str = getenv("INPUT_README_PATH")
-start_section: str = "<!--README_LEVEL_UP:START-->"
-end_section: str = "<!--README_LEVEL_UP:END-->"
-search_pattern: str = fr"{start_section}[\s\S]*?{end_section}"
-replace_str: str = (f"{start_section}\n"
-                    "```text\n"
-                    f"level: { user_level }  { draw_progress_bar() } {round(to_next_lvl, 2)}%\n"
-                    "```\n"
-                    f"{end_section}")
+    readme_instance: ReadmeLevel = ReadmeLevel()
 
+    user_level, to_next_lvl = itemgetter("current_level",
+                                        "percentage_level")(readme_instance.calc_current_level())
 
-# update readme
-with open(readme_path, mode="r", encoding="utf-8") as readme_file:
-    readme_content = readme_file.read()
+    readme_path: str = getenv("INPUT_README_PATH")
+    start_section: str = "<!--README_LEVEL_UP:START-->"
+    end_section: str = "<!--README_LEVEL_UP:END-->"
+    search_pattern: str = fr"{start_section}[\s\S]*?{end_section}"
+    replace_str: str = (f"{start_section}\n"
+                        "```text\n"
+                        f"level: { user_level }  { draw_progress_bar() } {round(to_next_lvl, 2)}%\n"
+                        "```\n"
+                        f"{end_section}")
 
-changed_readme = sub(search_pattern, repl=replace_str, string=readme_content)
 
-with open(readme_path, mode="w", encoding="utf-8") as readme_file:
-    readme_file.write(changed_readme)
+    # update readme
+    with open(readme_path, mode="r", encoding="utf-8") as readme_file:
+        readme_content = readme_file.read()
+
+    changed_readme = sub(search_pattern, repl=replace_str, string=readme_content)
+
+    with open(readme_path, mode="w", encoding="utf-8") as readme_file:
+        readme_file.write(changed_readme)