Only populate the report with formula paths

Library/Homebrew/cmd/update.rb

@@ -173,8 +173,18 @@ class Updater
 
     if initial_revision && initial_revision != current_revision
       diff.each_line do |line|
-        status, path = line.split
-        map[status.to_sym] << repository.join(path)
+        status, *paths = line.split
+
+        next unless File.extname(paths.last) == ".rb"
+        next unless File.dirname(paths.last) == formula_directory
+
+        case status
+        when "A", "M", "D"
+          map[status.to_sym] << repository.join(paths.first)
+        when /^R\d{0,3}/
+          map[:D] << repository.join(paths.first)
+          map[:A] << repository.join(paths.last)
+        end
       end
     end
 
@@ -183,12 +193,27 @@ class Updater
 
   private
 
+  def formula_directory
+    if repository == HOMEBREW_REPOSITORY
+      "Library/Formula"
+    elsif repository.join("Formula").directory?
+      "Formula"
+    elsif repository.join("HomebrewFormula").directory?
+      "HomebrewFormula"
+    else
+      "."
+    end
+  end
+
   def read_current_revision
     `git rev-parse -q --verify HEAD`.chomp
   end
 
   def diff
-    Utils.popen_read("git", "diff-tree", "-r", "--name-status", "--diff-filter=AMD", initial_revision, current_revision)
+    Utils.popen_read(
+      "git", "diff-tree", "-r", "--name-status", "--diff-filter=AMDR",
+      "-M85%", initial_revision, current_revision
+    )
   end
 
   def `(cmd)

Library/Homebrew/test/fixtures/updater_fixture.yaml

@@ -24,12 +24,6 @@ update_git_diff_output_with_formulae_changes: |
   M	Library/Homebrew/utils.rb
   M	README
   M	bin/brew
-update_git_diff_output_with_tapped_formulae_changes: |
-  M	Library/Contributions/brew_bash_completion.sh
-  A	Library/Taps/someuser/sometap/Formula/antiword.rb
-  A	Library/Taps/someuser/sometap/HomebrewFormula/lua.rb
-  A	Library/Taps/someuser/sometap/custom-formula.rb
-  A	Library/Taps/someuser/sometap/lib/not-a-formula.rb
 update_git_diff_output_with_removed_formulae: |
   A	Library/Formula/flac123.rb
   M	Library/Formula/gdal.rb
@@ -46,3 +40,6 @@ update_git_diff_output_with_changed_filetype: |
   D	Library/Formula/libgsasl.rb
   M	Library/Homebrew/cmd/update.rb
   M	SUPPORTERS.md
+update_git_diff_output_with_restructured_tap: |
+  R100	git.rb	Formula/git.rb
+  R100	lua.rb	Formula/lua.rb

Library/Homebrew/test/test_updater.rb

@@ -85,16 +85,6 @@ class UpdaterTests < Homebrew::TestCase
     assert_equal %w{ antiword bash-completion ddrescue dict lua }, @report.select_formula(:A)
   end
 
-  def test_update_homebrew_with_tapped_formula_changes
-    perform_update(fixture('update_git_diff_output_with_tapped_formulae_changes'))
-    assert_predicate @updater, :expectations_met?
-    assert_equal [
-      HOMEBREW_LIBRARY.join("Taps", "someuser/sometap/Formula/antiword.rb"),
-      HOMEBREW_LIBRARY.join("Taps", "someuser/sometap/HomebrewFormula/lua.rb"),
-      HOMEBREW_LIBRARY.join("Taps", "someuser/sometap/custom-formula.rb"),
-    ], @report.tapped_formula_for(:A)
-  end
-
   def test_update_homebrew_with_removed_formulae
     perform_update(fixture('update_git_diff_output_with_removed_formulae'))
     assert_predicate @updater, :expectations_met?
@@ -105,4 +95,16 @@ class UpdaterTests < Homebrew::TestCase
     perform_update(fixture('update_git_diff_output_with_changed_filetype'))
     assert_predicate @updater, :expectations_met?
   end
+
+  def test_update_homebrew_with_restructured_tap
+    repo = HOMEBREW_LIBRARY.join("Taps", "foo", "bar")
+    @updater = UpdaterMock.new(repo)
+    repo.join("Formula").mkpath
+
+    perform_update(fixture('update_git_diff_output_with_restructured_tap'))
+
+    assert_predicate @updater, :expectations_met?
+    assert_equal %w{foo/bar/git foo/bar/lua}, @report.select_formula(:A)
+    assert_equal %w{foo/bar/git foo/bar/lua}, @report.select_formula(:D)
+  end
 end