Merge pull request #933 from pchaigno/pro

Support of the .pro file extension for Prolog.

lib/linguist/heuristics.rb

@@ -19,6 +19,9 @@ module Linguist
         if languages.all? { |l| ["ECL", "Prolog"].include?(l) }
           result = disambiguate_ecl(data, languages)
         end
+        if languages.all? { |l| ["IDL", "Prolog"].include?(l) }
+          result = disambiguate_pro(data, languages)
+        end
         if languages.all? { |l| ["Common Lisp", "OpenCL"].include?(l) }
           result = disambiguate_cl(data, languages)
         end
@@ -51,6 +54,16 @@ module Linguist
       matches
     end
 
+    def self.disambiguate_pro(data, languages)
+      matches = []
+      if (data.include?(":-"))
+        matches << Language["Prolog"]
+      else
+        matches << Language["IDL"]
+      end
+      matches
+    end
+
     def self.disambiguate_ts(data, languages)
       matches = []
       if (data.include?("</translation>"))

lib/linguist/languages.yml

@@ -1820,6 +1820,7 @@ Prolog:
   extensions:
   - .pl
   - .ecl
+  - .pro
   - .prolog
 
 Propeller Spin: