indexers: get default filenames for indexing from lexer definitions

kallithea/config/conf.py

@@ -25,7 +25,7 b' Original author and date, and relevant c'
 :license: GPLv3, see LICENSE.md for more details.
 """
 
-from kallithea.lib.utils2 import __get_lem
+from kallithea.lib.utils2 import __get_lem, __get_index_filenames
 
 
 # language map is also used by whoosh indexer, which for those specified
@@ -38,7 +38,7 b' LANGUAGES_EXTENSIONS_MAP = __get_lem()'
 INDEX_EXTENSIONS = LANGUAGES_EXTENSIONS_MAP.keys()
 
 # Filenames we want to index content of using whoosh
-INDEX_FILENAMES = []
+INDEX_FILENAMES = __get_index_filenames()
 
 # list of readme files to search in file tree and display in summary
 # attached weights defines the search  order lower is first

kallithea/lib/utils2.py

@@ -78,6 +78,25 b' def __get_lem():'
     return dict(d)
 
 
+def __get_index_filenames():
+    """
+    Get list of known indexable filenames from pygment lexer internals
+    """
+    from pygments import lexers
+    from itertools import ifilter
+
+    filenames = []
+
+    def likely_filename(s):
+        return s.find('*') == -1 and s.find('[') == -1
+
+    for lx, t in sorted(lexers.LEXERS.items()):
+        for f in ifilter(likely_filename, t[-2]):
+            filenames.append(f)
+
+    return filenames
+
+
 def str2bool(_str):
     """
     returs True/False value from given string, it tries to translate the