Add support for OpenEdge ABL language

lib/linguist/blob_helper.rb

@@ -417,6 +417,17 @@ module Linguist
       end
     end
 
+    # Internal: Guess language of .cls files
+    #
+    # Returns a Language.
+    def guess_cls_language
+      if lines.grep(/^(%|\\)/).any?
+        Language['TeX']
+      else
+        Language['OpenEdge ABL']
+      end
+    end
+
     # Internal: Guess language of header files (.h).
     #
     # Returns a Language.

lib/linguist/languages.yml

@@ -740,6 +740,19 @@ OpenCL:
   extensions:
   - .cl
 
+OpenEdge ABL:
+  type: programming
+  aliases:
+  - progress
+  - openedge
+  - abl
+  primary_extension: .p
+  overrides:
+  - .cls
+  extensions:
+  - .cls
+  - .p
+
 PHP:
   type: programming
   extensions: