Remove extension -> language mapping from backend (move to frontend)

lib/tfw/components/source_code_event_handler.py

@@ -14,13 +14,11 @@ class FileManager:
         self.exclude = ['__pycache__']
         self._workdir = working_directory
         self.filename = selected_file or self._relpath(self.files[0])
-        self.language = map_file_extension_to_language(self.filename)
 
     def select_file(self, filename):
         if not filename in self.files:
            raise EnvironmentError('No such file in workdir!')
         self.filename = filename
-        self.language = map_file_extension_to_language(self.filename)
 
     @property
     def files(self):
@@ -81,7 +79,6 @@ class SourceCodeEventHandler(EventHandlerBase, SupervisorMixin):
 
     def attach_fileinfo(self, data):
         data['filename'] = self.filemanager.filename
-        data['language'] = self.filemanager.language
         data['files'] = self.filemanager.files
 
     def handle_event(self, anchor, data_json):
@@ -92,20 +89,3 @@ class SourceCodeEventHandler(EventHandlerBase, SupervisorMixin):
 
     def cleanup(self):
         self.monitor.stop()
-
-
-def map_file_extension_to_language(filename):
-    language_map = {
-        '.py': 'python',
-        '.js': 'javascript',
-        '.html': 'html',
-        '.css': 'css',
-        '.java': 'java',
-        '.cpp': 'c_cpp',
-        '.hpp': 'c_cpp',
-        '.c': 'c_cpp',
-        '.h': 'c_cpp',
-        '.cs': 'csharp'
-    }
-    _, extension = splitext(filename)
-    return language_map.get(extension, 'text')