Heuristic for Pod vs. Perl

.pod files classified as Pod if they contain any Pod syntax

lib/linguist/heuristics.rb

@@ -293,6 +293,14 @@ module Linguist
       end
     end
 
+    disambiguate ".pod" do |data|
+      if /^=\w+$/.match(data)
+        Language["Pod"]
+      else
+        Language["Perl"]
+      end
+    end
+
     disambiguate ".pro" do |data|
       if /^[^#]+:-/.match(data)
         Language["Prolog"]

samples/Perl/Sample.pod

@@ -0,0 +1,10 @@
+use strict;
+use warnings;
+package DZT::Sample;
+
+sub return_arrayref_of_values_passed {
+  my $invocant = shift;
+  return \@_;
+}
+
+1;

test/test_heuristics.rb

@@ -155,6 +155,14 @@ class TestHeuristcs < Minitest::Test
     })
   end
 
+  # Candidate languages = ["Pod", "Perl"]
+  def test_pod_by_heuristics
+    assert_heuristics({
+      "Perl" => all_fixtures("Perl", "*.pod"),
+      "Pod" => all_fixtures("Pod", "*.pod")
+    })
+  end
+
   # Candidate languages = ["IDL", "Prolog", "QMake", "INI"]
   def test_pro_by_heuristics
     assert_heuristics({