JS is minified if its average line length is greater than 100c

Fixes #27

lib/linguist/blob_helper.rb

@@ -151,6 +151,17 @@ module Linguist
       lines.grep(/\S/).size
     end
 
+    # Internal: Compute average line length.
+    #
+    # Returns Integer.
+    def average_line_length
+      if lines.any?
+        lines.inject(0) { |n, l| n += l.length } / lines.length
+      else
+        0
+      end
+    end
+
     # Public: Is the blob a generated file?
     #
     # Generated source code is supressed in diffs and is ignored by
@@ -166,16 +177,24 @@ module Linguist
     def generated?
       if ['.xib', '.nib', '.pbxproj'].include?(extname)
         true
-      elsif generated_coffeescript?
+      elsif generated_coffeescript? || minified_javascript?
         true
-      elsif extname == '.js'
-        # JS is minified if any lines are longer than 500c
-        lines.any? { |l| l.length > 500 }
       else
         false
       end
     end
 
+    # Internal: Is the blob minified JS?
+    #
+    # Consider JS minified if the average line length is
+    # greater then 100c.
+    #
+    # Returns true or false.
+    def minified_javascript?
+      return unless extname == '.js'
+      average_line_length > 100
+    end
+
     # Internal: Is the blob JS generated by CoffeeScript?
     #
     # Requires Blob#data

test/test_blob.rb

@@ -123,6 +123,12 @@ class TestBlob < Test::Unit::TestCase
     assert blob("MainMenu.nib").generated?
     assert blob("project.pbxproj").generated?
 
+    # Long line
+    assert !blob("uglify.js").generated?
+
+    # Inlined JS, but mostly code
+    assert !blob("json2_backbone.js").generated?
+
     # Minified JS
     assert !blob("jquery-1.6.1.js").generated?
     assert blob("jquery-1.6.1.min.js").generated?

test/test_repository.rb

@@ -19,7 +19,7 @@ class TestRepository < Test::Unit::TestCase
   end
 
   def test_linguist_language
-    assert_equal Language['Ruby'], linguist_repo.language
+    assert_equal Language['JavaScript'], linguist_repo.language
   end
 
   def test_linguist_languages