Enhance prompt handling: Convert escaped newlines to actual line breaks in rendering and format multiline prompts for storage with escaped newlines before saving.

Author: Nisarg38

src/promptix/core/base.py

@@ -187,4 +187,7 @@ def get_prompt(cls, prompt_template: str, version: Optional[str] = None, **varia
         except TemplateError as e:
             raise ValueError(f"Error rendering template for '{prompt_template}': {str(e)}")
 
+        # Convert escaped newlines (\n) to actual line breaks
+        result = result.replace("\\n", "\n")
+        
         return result

src/promptix/core/prompt_manager.py

@@ -29,11 +29,33 @@ def list_prompts(self) -> Dict[str, Any]:
         """Return all available prompts."""
         return self.prompts
 
+    def _format_prompt_for_storage(self, prompt_data: Dict[str, Any]) -> Dict[str, Any]:
+        """Convert multiline prompts to single line with escaped newlines."""
+        formatted_data = prompt_data.copy()
+        
+        # Process each version's system_message
+        if "versions" in formatted_data:
+            for version in formatted_data["versions"].values():
+                if "system_message" in version:
+                    # Convert multiline to single line with \n
+                    message = version["system_message"]
+                    if isinstance(message, str):
+                        lines = [line for line in message.strip().split("\n")]
+                        version["system_message"] = "\\n".join(lines)
+        
+        return formatted_data
+
     def save_prompts(self) -> None:
         """Save prompts to local prompts.json file."""
         try:
             prompts_file = Path("prompts.json")
-            with open(prompts_file, 'w') as f:
-                json.dump(self.prompts, f, indent=2)
+            
+            # Always format prompts before saving
+            formatted_prompts = {}
+            for prompt_id, prompt_data in self.prompts.items():
+                formatted_prompts[prompt_id] = self._format_prompt_for_storage(prompt_data)
+            
+            with open(prompts_file, 'w', encoding='utf-8') as f:
+                json.dump(formatted_prompts, f, indent=2, ensure_ascii=False)
         except Exception as e:
             raise ValueError(f"Failed to save prompts: {str(e)}")