Rename PATH#validate to PATH#existing.

Library/Homebrew/PATH.rb

@@ -23,6 +23,14 @@ class PATH
     self
   end
 
+  def select(&block)
+    self.class.new(@paths.select(&block))
+  end
+
+  def reject(&block)
+    self.class.new(@paths.reject(&block))
+  end
+
   def to_ary
     @paths
   end
@@ -49,9 +57,9 @@ class PATH
     @paths.empty?
   end
 
-  def validate
+  def existing
-    validated_path = self.class.new(@paths.select(&File.method(:directory?)))
+    existing_path = select(&File.method(:directory?))
-    validated_path unless validated_path.empty?
+    existing_path unless existing_path.empty?
   end
 
   private

Library/Homebrew/extend/ENV/std.rb

@@ -62,7 +62,7 @@ module Stdenv
       HOMEBREW_PREFIX/"share/pkgconfig",
       homebrew_extra_pkg_config_paths,
       "/usr/lib/pkgconfig",
-    ).validate
+    ).existing
   end
 
   # Removes the MAKEFLAGS environment variable, causing make to use a single job.

Library/Homebrew/extend/ENV/super.rb

@@ -122,7 +122,7 @@ module Superenv
       nil
     end
 
-    path.validate
+    path.existing
   end
 
   def homebrew_extra_pkg_config_paths
@@ -133,14 +133,14 @@ module Superenv
     PATH.new(
       deps.map { |d| d.opt_lib/"pkgconfig" },
       deps.map { |d| d.opt_share/"pkgconfig" },
-    ).validate
+    ).existing
   end
 
   def determine_pkg_config_libdir
     PATH.new(
       "/usr/lib/pkgconfig",
       homebrew_extra_pkg_config_paths,
-    ).validate
+    ).existing
   end
 
   def homebrew_extra_aclocal_paths
@@ -152,7 +152,7 @@ module Superenv
       keg_only_deps.map { |d| d.opt_share/"aclocal" },
       HOMEBREW_PREFIX/"share/aclocal",
       homebrew_extra_aclocal_paths,
-    ).validate
+    ).existing
   end
 
   def homebrew_extra_isystem_paths
@@ -163,11 +163,11 @@ module Superenv
     PATH.new(
       HOMEBREW_PREFIX/"include",
       homebrew_extra_isystem_paths,
-    ).validate
+    ).existing
   end
 
   def determine_include_paths
-    PATH.new(keg_only_deps.map(&:opt_include)).validate
+    PATH.new(keg_only_deps.map(&:opt_include)).existing
   end
 
   def homebrew_extra_library_paths
@@ -179,7 +179,7 @@ module Superenv
       keg_only_deps.map(&:opt_lib),
       HOMEBREW_PREFIX/"lib",
       homebrew_extra_library_paths,
-    ).validate
+    ).existing
   end
 
   def determine_dependencies
@@ -190,7 +190,7 @@ module Superenv
     PATH.new(
       keg_only_deps.map(&:opt_prefix),
       HOMEBREW_PREFIX.to_s,
-    ).validate
+    ).existing
   end
 
   def homebrew_extra_cmake_include_paths
@@ -198,7 +198,7 @@ module Superenv
   end
 
   def determine_cmake_include_path
-    PATH.new(homebrew_extra_cmake_include_paths).validate
+    PATH.new(homebrew_extra_cmake_include_paths).existing
   end
 
   def homebrew_extra_cmake_library_paths
@@ -206,7 +206,7 @@ module Superenv
   end
 
   def determine_cmake_library_path
-    PATH.new(homebrew_extra_cmake_library_paths).validate
+    PATH.new(homebrew_extra_cmake_library_paths).existing
   end
 
   def homebrew_extra_cmake_frameworks_paths
@@ -217,7 +217,7 @@ module Superenv
     PATH.new(
       deps.map(&:opt_frameworks),
       homebrew_extra_cmake_frameworks_paths,
-    ).validate
+    ).existing
   end
 
   def determine_make_jobs

Library/Homebrew/test/PATH_spec.rb

@@ -86,13 +86,13 @@ describe PATH do
     end
   end
 
-  describe "#validate" do
+  describe "#existing" do
     it "returns a new PATH without non-existent paths" do
       allow(File).to receive(:directory?).with("/path1").and_return(true)
       allow(File).to receive(:directory?).with("/path2").and_return(false)
 
       path = described_class.new("/path1", "/path2")
-      expect(path.validate.to_ary).to eq(["/path1"])
+      expect(path.existing.to_ary).to eq(["/path1"])
       expect(path.to_ary).to eq(["/path1", "/path2"])
     end
   end

Library/Homebrew/utils.rb

@@ -193,7 +193,7 @@ module Homebrew
     path = PATH.new(ENV["PATH"])
     path.prepend(RUBY_BIN) if which("ruby") != RUBY_PATH
     path.prepend(Gem.bindir)
-    ENV["PATH"] = path.validate
+    ENV["PATH"] = path.existing
 
     if Gem::Specification.find_all_by_name(name, version).empty?
       ohai "Installing or updating '#{name}' gem"