lib: move get_custom_lexer from utils to pygmentsutils

get_custom_lexer is the only dependency from helpers to utils.
In attempting to get a clearer dependency tree, we can move out
get_custom_lexer to a different place so that helpers does not depend on
utils.

It so happens that there already is a pygmentsutils.py file in lib, which is
a very good fit, since the lexers used in Kallithea are effectively provided
by pygments.

kallithea/lib/annotate.py

@@ -48,7 +48,7 b' def annotate_highlight(filenode, annotat'
     :param headers: dictionary with headers (keys are whats in ``order``
       parameter)
     """
-    from kallithea.lib.utils import get_custom_lexer
+    from kallithea.lib.pygmentsutils import get_custom_lexer
     options['linenos'] = True
     formatter = AnnotateHtmlFormatter(filenode=filenode, order=order,
         headers=headers,

kallithea/lib/helpers.py

@@ -41,7 +41,7 b' from webhelpers.html.tags import _set_in'
 
 from kallithea.config.routing import url
 from kallithea.lib.annotate import annotate_highlight
-from kallithea.lib.utils import get_custom_lexer
+from kallithea.lib.pygmentsutils import get_custom_lexer
 from kallithea.lib.utils2 import str2bool, safe_unicode, safe_str, \
     time_to_datetime, AttributeDict, safe_int, MENTIONS_REGEX
 from kallithea.lib.markup_renderer import url_re

kallithea/lib/pygmentsutils.py

@@ -78,3 +78,15 b' def get_index_filenames():'
             filenames.append(f)
 
     return filenames
+
+
+def get_custom_lexer(extension):
+    """
+    returns a custom lexer if it's defined in rcextensions module, or None
+    if there's no custom lexer defined
+    """
+    import kallithea
+    #check if we didn't define this extension as other lexer
+    if kallithea.EXTENSIONS and extension in kallithea.EXTENSIONS.EXTRA_LEXERS:
+        _lexer_name = kallithea.EXTENSIONS.EXTRA_LEXERS[extension]
+        return lexers.get_lexer_by_name(_lexer_name)

kallithea/lib/utils.py

@@ -580,19 +580,6 b' def load_rcextensions(root_path):'
         #        setattr(EXT, k, getattr(rcextensions, k))
 
 
-def get_custom_lexer(extension):
-    """
-    returns a custom lexer if it's defined in rcextensions module, or None
-    if there's no custom lexer defined
-    """
-    import kallithea
-    from pygments import lexers
-    #check if we didn't define this extension as other lexer
-    if kallithea.EXTENSIONS and extension in kallithea.EXTENSIONS.EXTRA_LEXERS:
-        _lexer_name = kallithea.EXTENSIONS.EXTRA_LEXERS[extension]
-        return lexers.get_lexer_by_name(_lexer_name)
-
-
 #==============================================================================
 # TEST FUNCTIONS AND CREATORS
 #==============================================================================