fix: separation between run and print function

src/rougail/output_json/__init__.py

@@ -77,7 +77,7 @@ class RougailOutputJson:
                     )
                 self.errors.append(f"  - {option.description()}")
 
-    def exporter(self) -> bool:
+    def exporter(self) -> None:
         self.config.property.read_write()
         self.mandatory()
         if self.read_write:
@@ -96,11 +96,13 @@ class RougailOutputJson:
             self.config,
             self.dico,
         )
-        return True
 
     def run(self) -> None:
         self.exporter()
-        print(dumps(self.dico, ensure_ascii=False, indent=2))
+        return dumps(self.dico, ensure_ascii=False, indent=2)
+
+    def print(self) -> str:
+        print(self.run())
 
     def parse_family(
         self,