rework format method to support multiple output files

PyTeX/format/simple_tex_formatter.py

@@ -14,13 +14,6 @@ class SimpleTeXFormatter(TexFormatter):
         }
         return self.name + switcher[self.config.tex_type]
 
-    def open_output_stream(self, build_dir: Path):
-        out_file = build_dir / self.output_file
-        if out_file.exists():
-            raise NotImplementedError
-        else:
-            self._output_file = out_file.open('w')
-
     def close_output_stream(self):
         self._output_file.close()
 

PyTeX/format/tex_formatter.py

@@ -62,12 +62,16 @@ class TexFormatter(PyTeXFormatter, ABC):
         self._macros: List[Macro] = []
         self._line_stream: Optional[LineStream] = None
 
-    @abstractmethod
+    def open_output_stream(self, build_dir: Path, filename: str) -> None:
-    def open_output_stream(self, build_dir: Path) -> None:
         """
-
         :param build_dir: Where to open output stream
+        :param filename: Name of file
         """
+        out_file = build_dir / filename
+        if out_file.exists():
+            raise NotImplementedError
+        else:
+            self._output_file = out_file.open('w')
 
     @abstractmethod
     def close_output_stream(self) -> None:
@@ -151,7 +155,8 @@ class TexFormatter(PyTeXFormatter, ABC):
             ))
 
     def format(self, build_dir: Path, overwrite: bool = False) -> List[Tuple[str, FormattingConfig]]:
-        self.open_output_stream(build_dir)
+        for filename in self.output_files:
+            self.open_output_stream(build_dir, filename)
             self.format_pre_header()
             self.format_header()
             self.format_post_header()