Improve .cls language detection

lib/linguist/blob_helper.rb

@@ -423,8 +423,15 @@ module Linguist
     def guess_cls_language
       if lines.grep(/^(%|\\)/).any?
         Language['TeX']
-      else
+      elsif lines.grep(/^\s*(CLASS|METHOD|INTERFACE).*:\s*/i).any? || lines.grep(/^\s*(USING|DEFINE)/i).any?
         Language['OpenEdge ABL']
+      elsif lines.grep(/\{$/).any? || lines.grep(/\}$/).any?
+        Language['Apex']
+      elsif lines.grep(/^(\'\*|Attribute|Option|Sub|Private|Protected|Public|Friend)/i).any?
+        Language['Visual Basic']
+      else
+        # The most common language should be the fallback
+        Language['TeX']
       end
     end
 

lib/linguist/languages.yml

@@ -54,6 +54,12 @@ Ada:
   - .adb
   - .ads
 
+Apex:
+  type: programming
+  lexer: Text only
+  extensions:
+  - .cls
+
 AppleScript:
   aliases:
   - osascript
@@ -747,8 +753,6 @@ OpenEdge ABL:
   - openedge
   - abl
   primary_extension: .p
-  overrides:
-  - .cls
   extensions:
   - .cls
   - .p
@@ -1053,6 +1057,8 @@ Tcsh:
 TeX:
   type: markup
   primary_extension: .tex
+  overrides:
+  - .cls
   extensions:
   - .aux
   - .cls