From 258a676759b79239e287e535f797b9fe5313b9a0 Mon Sep 17 00:00:00 2001
From: Alan Hamlett <alan.hamlett@gmail.com>
Date: Mon, 15 Jun 2015 18:27:58 -0700
Subject: [PATCH] limit language detection to known file extensions, unless
 file contents has a vim modeline

---
 plugin/packages/wakatime/stats.py | 56 ++++++++++++++++++++++++-------
 1 file changed, 44 insertions(+), 12 deletions(-)

diff --git a/plugin/packages/wakatime/stats.py b/plugin/packages/wakatime/stats.py
index 874cf00..7a4c91b 100644
--- a/plugin/packages/wakatime/stats.py
+++ b/plugin/packages/wakatime/stats.py
@@ -20,13 +20,14 @@ if sys.version_info[0] == 2:
     sys.path.insert(0, os.path.join(os.path.dirname(os.path.abspath(__file__)), 'packages', 'pygments_py2'))
 else:
     sys.path.insert(0, os.path.join(os.path.dirname(os.path.abspath(__file__)), 'packages', 'pygments_py3'))
-from pygments.lexers import guess_lexer, guess_lexer_for_filename
+from pygments.lexers import get_lexer_by_name, guess_lexer_for_filename
+from pygments.modeline import get_filetype_from_buffer
 
 
 log = logging.getLogger('WakaTime')
 
 
-# force file name extensions to be recognized as a certain language
+# extensions taking priority over lexer
 EXTENSIONS = {
     'j2': 'HTML',
     'markdown': 'Markdown',
@@ -34,6 +35,8 @@ EXTENSIONS = {
     'mdown': 'Markdown',
     'twig': 'Twig',
 }
+
+# lexers to human readable languages
 TRANSLATIONS = {
     'CSS+Genshi Text': 'CSS',
     'CSS+Lasso': 'CSS',
@@ -45,6 +48,11 @@ TRANSLATIONS = {
     'RHTML': 'HTML',
 }
 
+# extensions for when no lexer is found
+AUXILIARY_EXTENSIONS = {
+    'vb': 'VB.net',
+}
+
 
 def guess_language(file_name):
     """Guess lexer and language for a file.
@@ -58,11 +66,17 @@ def guess_language(file_name):
 
     # guess language from file extension
     if file_name:
-        language = guess_language_from_extension(file_name.rsplit('.', 1)[-1])
+        language = get_language_from_extension(file_name, EXTENSIONS)
 
     # get language from lexer if we didn't have a hard-coded extension rule
     if language is None and lexer:
-        language = translate_language(u(lexer.name))
+        language = u(lexer.name)
+
+    if language is None:
+        language = get_language_from_extension(file_name, AUXILIARY_EXTENSIONS)
+
+    if language is not None:
+        language = translate_language(language)
 
     return language, lexer
 
@@ -79,11 +93,11 @@ def smart_guess_lexer(file_name):
     text = get_file_contents(file_name)
 
     try:
-        guess_1 = guess_lexer(text)
+        guess_1 = guess_lexer_for_filename(file_name, text)
     except:
         guess_1 = None
     try:
-        guess_2 = guess_lexer_for_filename(file_name, text)
+        guess_2 = guess_lexer_using_modeline(text)
     except:
         guess_2 = None
     try:
@@ -104,15 +118,33 @@ def smart_guess_lexer(file_name):
     return lexer
 
 
-def guess_language_from_extension(extension):
-    """Checks hard-coded extension map for a matching language.
+def get_language_from_extension(file_name, extension_map):
+    """Returns a matching language for the given file_name using extension_map.
     """
 
+    extension = file_name.rsplit('.', 1)[-1] if len(file_name.rsplit('.', 1)) > 1 else None
+
     if extension:
-        if extension in EXTENSIONS:
-            return EXTENSIONS[extension]
-        if extension.lower() in EXTENSIONS:
-            return EXTENSIONS[extension.lower()]
+        if extension in extension_map:
+            return extension_map[extension]
+        if extension.lower() in extension_map:
+            return extension_map[extension.lower()]
+
+    return None
+
+
+def guess_lexer_using_modeline(text):
+    """Guess lexer for given text using Vim modeline.
+    """
+
+    file_type = get_filetype_from_buffer(text)
+
+    if file_type is not None:
+        try:
+            return get_lexer_by_name(file_type)
+        except:
+            pass
+
     return None