The CLI shouldn't display unsupported file extensions

main.py

@@ -8,7 +8,7 @@ import mimetypes
 import argparse
 import multiprocessing
 
-from src import parser_factory
+from src import parser_factory, unsupported_extensions
 
 __version__ = '0.1.0'
 
@@ -74,8 +74,15 @@ def show_parsers():
     print('[+] Supported formats:')
     for parser in parser_factory._get_parsers():
         for mtype in parser.mimetypes:
-            extensions = ', '.join(mimetypes.guess_all_extensions(mtype))
-            print('  - %s (%s)' % (mtype, extensions))
+            extensions = set()
+            for extension in mimetypes.guess_all_extensions(mtype):
+                if extension[1:] not in unsupported_extensions:  # skip the dot
+                    extensions.add(extension)
+            if not extensions:
+                # we're not supporting a single extension in the current
+                # mimetype, so there is not point in showing the mimetype at all
+                continue
+            print('  - %s (%s)' % (mtype, ', '.join(extensions)))
 
 
 def __get_files_recursively(files):

src/__init__.py

@@ -1 +1,5 @@
-#!/bin/env python3
+#!/bin/env python3
+
+# A set of extension that aren't supported, despite matching a supported mimetype
+unsupported_extensions = set(['bat', 'c', 'h', 'ksh', 'pl', 'txt', 'asc',
+    'text', 'pot', 'brf', 'srt', 'rdf', 'wsdl', 'xpdl', 'xsl', 'xsd'])

src/parser_factory.py

@@ -3,7 +3,7 @@ import mimetypes
 import importlib
 import pkgutil
 
-from . import abstract
+from . import abstract, unsupported_extensions
 
 from typing import TypeVar
 
@@ -27,13 +27,10 @@ def _get_parsers() -> list:
 
 
 def get_parser(filename: str) -> (T, str):
-    # A set of extension that aren't supported, despite matching a known mimetype
-    unknown_extensions = set(['bat', 'c', 'h', 'ksh', 'pl', 'txt', 'asc',
-        'text', 'pot', 'brf', 'srt', 'rdf', 'wsdl', 'xpdl', 'xsl', 'xsd'])
     mtype, _ = mimetypes.guess_type(filename)
 
     _, extension = os.path.splitext(filename)
-    if extension in unknown_extensions:
+    if extension in unsupported_extensions:
         return None, mtype
 
     for c in _get_parsers():