From 8bd14971b908b7d3c7b41a715d2904df88ee7b3c Mon Sep 17 00:00:00 2001
From: George Claghorn <george.claghorn@gmail.com>
Date: Sun, 20 Aug 2017 16:30:15 -0400
Subject: Rename ActiveStorage::Filename#extname to extension_with_delimiter

---
 activestorage/app/models/active_storage/filename.rb | 20 +++++++++++---------
 activestorage/test/models/filename_test.rb          | 18 ++++++++++++++++++
 2 files changed, 29 insertions(+), 9 deletions(-)

diff --git a/activestorage/app/models/active_storage/filename.rb b/activestorage/app/models/active_storage/filename.rb
index 6a9889addf..df21078718 100644
--- a/activestorage/app/models/active_storage/filename.rb
+++ b/activestorage/app/models/active_storage/filename.rb
@@ -9,21 +9,23 @@ class ActiveStorage::Filename
     @filename = filename
   end
 
-  # Filename.new("racecar.jpg").extname # => ".jpg"
-  def extname
-    File.extname(@filename)
+  # Filename.new("racecar.jpg").base # => "racecar"
+  def base
+    File.basename @filename, extension_with_delimiter
   end
 
-  # Filename.new("racecar.jpg").extension # => "jpg"
-  def extension
-    extname.from(1)
+  # Filename.new("racecar.jpg").extension_with_delimiter # => ".jpg"
+  def extension_with_delimiter
+    File.extname @filename
   end
 
-  # Filename.new("racecar.jpg").base # => "racecar"
-  def base
-    File.basename(@filename, extname)
+  # Filename.new("racecar.jpg").extension_without_delimiter # => "jpg"
+  def extension_without_delimiter
+    extension_with_delimiter.from(1).to_s
   end
 
+  alias_method :extension, :extension_without_delimiter
+
   # Filename.new("foo:bar.jpg").sanitized # => "foo-bar.jpg"
   # Filename.new("foo/bar.jpg").sanitized # => "foo-bar.jpg"
   #
diff --git a/activestorage/test/models/filename_test.rb b/activestorage/test/models/filename_test.rb
index f1e4a467ba..88405e41c0 100644
--- a/activestorage/test/models/filename_test.rb
+++ b/activestorage/test/models/filename_test.rb
@@ -3,6 +3,24 @@
 require "test_helper"
 
 class ActiveStorage::FilenameTest < ActiveSupport::TestCase
+  test "base" do
+    assert_equal "racecar", ActiveStorage::Filename.new("racecar.jpg").base
+    assert_equal "race.car", ActiveStorage::Filename.new("race.car.jpg").base
+    assert_equal "racecar", ActiveStorage::Filename.new("racecar").base
+  end
+
+  test "extension with delimiter" do
+    assert_equal ".jpg", ActiveStorage::Filename.new("racecar.jpg").extension_with_delimiter
+    assert_equal ".jpg", ActiveStorage::Filename.new("race.car.jpg").extension_with_delimiter
+    assert_equal "", ActiveStorage::Filename.new("racecar").extension_with_delimiter
+  end
+
+  test "extension without delimiter" do
+    assert_equal "jpg", ActiveStorage::Filename.new("racecar.jpg").extension_without_delimiter
+    assert_equal "jpg", ActiveStorage::Filename.new("race.car.jpg").extension_without_delimiter
+    assert_equal "", ActiveStorage::Filename.new("racecar").extension_without_delimiter
+  end
+
   test "sanitize" do
     "%$|:;/\t\r\n\\".each_char do |character|
       filename = ActiveStorage::Filename.new("foo#{character}bar.pdf")
-- 
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