Use backend-specific suffixes for output filenames.

pixelocr/formatting.py

@@ -21,6 +21,7 @@ from .glyphdb import WhitespaceData
 
 
 class OutputFormat(object):
+    suffix = ''
     last_tag = None
 
     def __call__(self, glyph_data_stream):
@@ -65,6 +66,7 @@ class OutputFormat(object):
 
 
 class TextFormat(OutputFormat):
+    suffix = '.txt'
     def assign_tag(self, glyph_data):
         return None
 
@@ -73,6 +75,7 @@ class TextFormat(OutputFormat):
 
 
 class HTMLFormat(OutputFormat):
+    suffix = '.html'
     def assign_glyph_tag(self, glyph_data):
         style = glyph_data.style
         if style.bold:

pixelocr/gui/ocrengine.py

@@ -65,7 +65,7 @@ class OCREngine(QThread):
             self.pageChanged.emit(page)
             page_text = self.recognize_page(page)
             print(page_text)
-            with open(filename + '.txt', 'w') as page_text_file:
+            with open(filename + self.output_format.suffix, 'w') as page_text_file:
                 page_text_file.write(page_text)
 
     def recognize_page(self, page):