requirements: move more to compat.

21 files changed, 60 insertions, 102 deletions

diff --git a/Library/Homebrew/caveats.rb b/Library/Homebrew/caveats.rb
index ca1c2a9f8..8cd1053fb 100644
--- a/Library/Homebrew/caveats.rb
+++ b/Library/Homebrew/caveats.rb
@@ -1,4 +1,5 @@
 require "forwardable"
+require "language/python"
 
 class Caveats
   extend Forwardable
diff --git a/Library/Homebrew/compat/dependency_collector.rb b/Library/Homebrew/compat/dependency_collector.rb
index 2e97d9d7f..82511bcc7 100644
--- a/Library/Homebrew/compat/dependency_collector.rb
+++ b/Library/Homebrew/compat/dependency_collector.rb
@@ -22,31 +22,61 @@ class DependencyCollector
     case spec
     when :clt
       odeprecated "'depends_on :clt'"
+    when :tex
+      # odeprecated "'depends_on :tex'"
+      TeXRequirement.new(tags)
     when :autoconf, :automake, :bsdmake, :libtool
       output_deprecation(spec, tags)
       autotools_dep(spec, tags)
     when :cairo, :fontconfig, :freetype, :libpng, :pixman
       output_deprecation(spec, tags)
       Dependency.new(spec.to_s, tags)
-    when :apr
-      # output_deprecation(spec, tags, "apr-util")
-      Dependency.new("apr-util", tags)
+    when :ant, :expat
+      # output_deprecation(spec, tags)
+      Dependency.new(spec.to_s, tags)
     when :libltdl
       tags << :run
       output_deprecation("libtool", tags)
       Dependency.new("libtool", tags)
+    when :apr
+      # output_deprecation(spec, tags, "apr-util")
+      Dependency.new("apr-util", tags)
+    when :fortran
+      # output_deprecation(spec, tags, "gcc")
+      FortranRequirement.new(tags)
+    when :gpg
+      # output_deprecation(spec, tags, "gnupg")
+      GPG2Requirement.new(tags)
+    when :hg
+      # output_deprecation(spec, tags, "mercurial")
+      MercurialRequirement.new(tags)
+    when :mpi
+      # output_deprecation(spec, tags, "open-mpi")
+      MPIRequirement.new(*tags)
+    when :emacs
+      # output_deprecation(spec, tags)
+      EmacsRequirement.new(tags)
     when :mysql
-      # output_deprecation("mysql", tags)
+      # output_deprecation(spec, tags)
       MysqlRequirement.new(tags)
+    when :perl
+      # output_deprecation(spec, tags)
+      PerlRequirement.new(tags)
     when :postgresql
-      # output_deprecation("postgresql", tags)
+      # output_deprecation(spec, tags)
       PostgresqlRequirement.new(tags)
-    when :gpg
-      # output_deprecation("gnupg", tags)
-      GPG2Requirement.new(tags)
+    when :python, :python2
+      # output_deprecation(spec, tags)
+      PythonRequirement.new(tags)
+    when :python3
+      # output_deprecation(spec, tags)
+      Python3Requirement.new(tags)
     when :rbenv
-      # output_deprecation("rbenv", tags)
+      # output_deprecation(spec, tags)
       RbenvRequirement.new(tags)
+    when :ruby
+      # output_deprecation(spec, tags)
+      RubyRequirement.new(tags)
     else
       _parse_symbol_spec(spec, tags)
     end
diff --git a/Library/Homebrew/compat/requirements.rb b/Library/Homebrew/compat/requirements.rb
index da6d867b3..48911b52b 100644
--- a/Library/Homebrew/compat/requirements.rb
+++ b/Library/Homebrew/compat/requirements.rb
@@ -1,5 +1,11 @@
 require "requirements"
+require "compat/requirements/emacs_requirement"
+require "compat/requirements/fortran_requirement"
 require "compat/requirements/language_module_requirement"
+require "compat/requirements/mpi_requirement"
+require "compat/requirements/perl_requirement"
+require "compat/requirements/python_requirement"
+require "compat/requirements/ruby_requirement"
 require "compat/requirements/tex_requirement"
 
 class MysqlRequirement < Requirement
diff --git a/Library/Homebrew/requirements/emacs_requirement.rb b/Library/Homebrew/compat/requirements/emacs_requirement.rb
index c8e2ec274..c8e2ec274 100644
--- a/Library/Homebrew/requirements/emacs_requirement.rb
+++ b/Library/Homebrew/compat/requirements/emacs_requirement.rb
diff --git a/Library/Homebrew/requirements/fortran_requirement.rb b/Library/Homebrew/compat/requirements/fortran_requirement.rb
index ba3fead6f..ba3fead6f 100644
--- a/Library/Homebrew/requirements/fortran_requirement.rb
+++ b/Library/Homebrew/compat/requirements/fortran_requirement.rb
diff --git a/Library/Homebrew/requirements/mpi_requirement.rb b/Library/Homebrew/compat/requirements/mpi_requirement.rb
index 065b56c8b..065b56c8b 100644
--- a/Library/Homebrew/requirements/mpi_requirement.rb
+++ b/Library/Homebrew/compat/requirements/mpi_requirement.rb
diff --git a/Library/Homebrew/requirements/perl_requirement.rb b/Library/Homebrew/compat/requirements/perl_requirement.rb
index 70eb2a36c..70eb2a36c 100644
--- a/Library/Homebrew/requirements/perl_requirement.rb
+++ b/Library/Homebrew/compat/requirements/perl_requirement.rb
diff --git a/Library/Homebrew/requirements/python_requirement.rb b/Library/Homebrew/compat/requirements/python_requirement.rb
index 3215d0a6c..3215d0a6c 100644
--- a/Library/Homebrew/requirements/python_requirement.rb
+++ b/Library/Homebrew/compat/requirements/python_requirement.rb
diff --git a/Library/Homebrew/requirements/ruby_requirement.rb b/Library/Homebrew/compat/requirements/ruby_requirement.rb
index a9ec8c42d..a9ec8c42d 100644
--- a/Library/Homebrew/requirements/ruby_requirement.rb
+++ b/Library/Homebrew/compat/requirements/ruby_requirement.rb
diff --git a/Library/Homebrew/dependency_collector.rb b/Library/Homebrew/dependency_collector.rb
index 2e955a5e2..3164d237e 100644
--- a/Library/Homebrew/dependency_collector.rb
+++ b/Library/Homebrew/dependency_collector.rb
@@ -53,10 +53,6 @@ class DependencyCollector
     parse_spec(spec, Array(tags))
   end
 
-  def ant_dep_if_needed(tags)
-    Dependency.new("ant", tags)
-  end
-
   def cvs_dep_if_needed(tags)
     Dependency.new("cvs", tags)
   end
@@ -65,10 +61,6 @@ class DependencyCollector
     Dependency.new("xz", tags)
   end
 
-  def expat_dep_if_needed(tags)
-    Dependency.new("expat", tags)
-  end
-
   def ld64_dep_if_needed(*)
     LD64Dependency.new
   end
@@ -112,23 +104,11 @@ class DependencyCollector
     when :xcode      then XcodeRequirement.new(tags)
     when :linux      then LinuxRequirement.new(tags)
     when :macos      then MacOSRequirement.new(tags)
-    when :fortran    then FortranRequirement.new(tags)
-    when :mpi        then MPIRequirement.new(*tags)
-    when :tex        then TeXRequirement.new(tags)
     when :arch       then ArchRequirement.new(tags)
-    when :hg         then MercurialRequirement.new(tags)
-    when :python     then PythonRequirement.new(tags)
-    when :python2    then PythonRequirement.new(tags)
-    when :python3    then Python3Requirement.new(tags)
     when :java       then JavaRequirement.new(tags)
-    when :ruby       then RubyRequirement.new(tags)
     when :osxfuse    then OsxfuseRequirement.new(tags)
-    when :perl       then PerlRequirement.new(tags)
     when :tuntap     then TuntapRequirement.new(tags)
-    when :ant        then ant_dep_if_needed(tags)
-    when :emacs      then EmacsRequirement.new(tags)
     when :ld64       then ld64_dep_if_needed(tags)
-    when :expat      then expat_dep_if_needed(tags)
     else
       raise ArgumentError, "Unsupported special dependency #{spec.inspect}"
     end
diff --git a/Library/Homebrew/dev-cmd/audit.rb b/Library/Homebrew/dev-cmd/audit.rb
index 6da591f1a..4982bfbc5 100644
--- a/Library/Homebrew/dev-cmd/audit.rb
+++ b/Library/Homebrew/dev-cmd/audit.rb
@@ -379,24 +379,7 @@ class FormulaAuditor
 
         case dep.name
         when "git"
-          problem "Don't use git as a dependency"
-        when "gfortran"
-          problem "Use `depends_on :fortran` instead of `depends_on 'gfortran'`"
-        when "ruby"
-          problem <<~EOS
-            Don't use "ruby" as a dependency. If this formula requires a
-            minimum Ruby version not provided by the system you should
-            use the RubyRequirement:
-              depends_on :ruby => "1.8"
-            where "1.8" is the minimum version of Ruby required.
-          EOS
-        when "open-mpi", "mpich"
-          problem <<~EOS
-            There are multiple conflicting ways to install MPI. Use an MPIRequirement:
-              depends_on :mpi => [<lang list>]
-            Where <lang list> is a comma delimited list that can include:
-              :cc, :cxx, :f77, :f90
-            EOS
+          problem "Don't use git as a dependency (it's always available)"
         when *BUILD_TIME_DEPS
           next if dep.build? || dep.run?
           problem <<~EOS
diff --git a/Library/Homebrew/extend/os/mac/dependency_collector.rb b/Library/Homebrew/extend/os/mac/dependency_collector.rb
index 66dcf3afe..03534bab9 100644
--- a/Library/Homebrew/extend/os/mac/dependency_collector.rb
+++ b/Library/Homebrew/extend/os/mac/dependency_collector.rb
@@ -1,9 +1,4 @@
 class DependencyCollector
-  def ant_dep_if_needed(tags)
-    return if MacOS.version < :mavericks
-    Dependency.new("ant", tags)
-  end
-
   def cvs_dep_if_needed(tags)
     return if MacOS.version < :lion
     Dependency.new("cvs", tags)
@@ -14,12 +9,6 @@ class DependencyCollector
     Dependency.new("xz", tags)
   end
 
-  def expat_dep_if_needed(tags)
-    # Tiger doesn't ship expat in /usr/lib
-    return if MacOS.version > :tiger
-    Dependency.new("expat", tags)
-  end
-
   def ld64_dep_if_needed(*)
     # Tiger's ld is too old to properly link some software
     return if MacOS.version > :tiger
diff --git a/Library/Homebrew/requirements.rb b/Library/Homebrew/requirements.rb
index 456dabd0a..e8c33465b 100644
--- a/Library/Homebrew/requirements.rb
+++ b/Library/Homebrew/requirements.rb
@@ -1,18 +1,12 @@
 require "requirement"
-require "requirements/fortran_requirement"
 require "requirements/linux_requirement"
 require "requirements/macos_requirement"
 require "requirements/maximum_macos_requirement"
-require "requirements/mpi_requirement"
 require "requirements/osxfuse_requirement"
-require "requirements/perl_requirement"
-require "requirements/python_requirement"
 require "requirements/java_requirement"
-require "requirements/ruby_requirement"
 require "requirements/tuntap_requirement"
 require "requirements/unsigned_kext_requirement"
 require "requirements/x11_requirement"
-require "requirements/emacs_requirement"
 require "requirements/arch_requirement"
 require "requirements/xcode_requirement"
 
diff --git a/Library/Homebrew/requirements/java_requirement.rb b/Library/Homebrew/requirements/java_requirement.rb
index c49fdcba9..213203ff3 100644
--- a/Library/Homebrew/requirements/java_requirement.rb
+++ b/Library/Homebrew/requirements/java_requirement.rb
@@ -10,7 +10,7 @@ class JavaRequirement < Requirement
     next true
   end
 
-  def initialize(tags)
+  def initialize(tags = [])
     @version = tags.shift if /(\d+\.)+\d/ =~ tags.first
     super
   end
diff --git a/Library/Homebrew/requirements/xcode_requirement.rb b/Library/Homebrew/requirements/xcode_requirement.rb
index ff167c6fd..a5f078c62 100644
--- a/Library/Homebrew/requirements/xcode_requirement.rb
+++ b/Library/Homebrew/requirements/xcode_requirement.rb
@@ -5,7 +5,7 @@ class XcodeRequirement < Requirement
 
   satisfy(build_env: false) { xcode_installed_version }
 
-  def initialize(tags)
+  def initialize(tags = [])
     @version = tags.find { |tag| tags.delete(tag) if tag =~ /(\d\.)+\d/ }
     super
   end
diff --git a/Library/Homebrew/test/dependency_collector_spec.rb b/Library/Homebrew/test/dependency_collector_spec.rb
index 5ba3c20bd..cfbd260b3 100644
--- a/Library/Homebrew/test/dependency_collector_spec.rb
+++ b/Library/Homebrew/test/dependency_collector_spec.rb
@@ -66,7 +66,7 @@ describe DependencyCollector do
       expect(dep).to be_optional
     end
 
-    specify "ant dependency" do
+    specify "ant dependency", :needs_compat do
       subject.add ant: :build
       expect(find_dependency("ant")).to eq(Dependency.new("ant", [:build]))
     end
diff --git a/Library/Homebrew/test/formula_installer_spec.rb b/Library/Homebrew/test/formula_installer_spec.rb
index b85e75b81..d3710a4cb 100644
--- a/Library/Homebrew/test/formula_installer_spec.rb
+++ b/Library/Homebrew/test/formula_installer_spec.rb
@@ -133,7 +133,7 @@ describe FormulaInstaller do
     }.to raise_error(CannotInstallFormulaError)
   end
 
-  describe "#install_requirement_formula?" do
+  describe "#install_requirement_formula?", :needs_compat do
     before do
       @requirement = Python3Requirement.new
       @requirement_dependency = @requirement.to_dependency
diff --git a/Library/Homebrew/test/formula_spec.rb b/Library/Homebrew/test/formula_spec.rb
index 6ba6af307..a9d09cb00 100644
--- a/Library/Homebrew/test/formula_spec.rb
+++ b/Library/Homebrew/test/formula_spec.rb
@@ -711,21 +711,21 @@ describe Formula do
     f1 = formula "f1" do
       url "f1-1"
 
-      depends_on :python
+      depends_on :java
       depends_on x11: :recommended
       depends_on xcode: ["1.0", :optional]
     end
     stub_formula_loader(f1)
 
-    python = PythonRequirement.new
+    java = JavaRequirement.new
     x11 = X11Requirement.new("x11", [:recommended])
     xcode = XcodeRequirement.new(["1.0", :optional])
 
-    expect(Set.new(f1.recursive_requirements)).to eq(Set[python, x11])
+    expect(Set.new(f1.recursive_requirements)).to eq(Set[java, x11])
 
     f1.build = BuildOptions.new(["--with-xcode", "--without-x11"], f1.options)
 
-    expect(Set.new(f1.recursive_requirements)).to eq(Set[python, xcode])
+    expect(Set.new(f1.recursive_requirements)).to eq(Set[java, xcode])
 
     f1.build = f1.stable.build
     f2 = formula "f2" do
@@ -734,11 +734,11 @@ describe Formula do
       depends_on "f1"
     end
 
-    expect(Set.new(f2.recursive_requirements)).to eq(Set[python, x11])
-    expect(Set.new(f2.recursive_requirements {})).to eq(Set[python, x11, xcode])
+    expect(Set.new(f2.recursive_requirements)).to eq(Set[java, x11])
+    expect(Set.new(f2.recursive_requirements {})).to eq(Set[java, x11, xcode])
 
     requirements = f2.recursive_requirements do |_dependent, requirement|
-      Requirement.prune if requirement.is_a?(PythonRequirement)
+      Requirement.prune if requirement.is_a?(JavaRequirement)
     end
 
     expect(Set.new(requirements)).to eq(Set[x11, xcode])
diff --git a/Library/Homebrew/test/mpi_requirement_spec.rb b/Library/Homebrew/test/mpi_requirement_spec.rb
index f32b27993..87f99eb3a 100644
--- a/Library/Homebrew/test/mpi_requirement_spec.rb
+++ b/Library/Homebrew/test/mpi_requirement_spec.rb
@@ -1,6 +1,6 @@
-require "requirements/mpi_requirement"
+require "compat/requirements/mpi_requirement"
 
-describe MPIRequirement do
+describe MPIRequirement, :needs_compat do
   describe "::new" do
     subject { described_class.new(*(wrappers + tags)) }
     let(:wrappers) { [:cc, :cxx, :f77] }
diff --git a/Library/Homebrew/test/os/mac/dependency_collector_spec.rb b/Library/Homebrew/test/os/mac/dependency_collector_spec.rb
index 688149021..357c35c2d 100644
--- a/Library/Homebrew/test/os/mac/dependency_collector_spec.rb
+++ b/Library/Homebrew/test/os/mac/dependency_collector_spec.rb
@@ -22,18 +22,6 @@ describe DependencyCollector do
     expect(subject.build(:ld64)).to be nil
   end
 
-  specify "ant Mavericks or newer dependency" do
-    allow(MacOS).to receive(:version).and_return(MacOS::Version.new("10.9"))
-    subject.add ant: :build
-    expect(subject.deps.find { |dep| dep.name == "ant" }).to eq(Dependency.new("ant", [:build]))
-  end
-
-  specify "ant pre-Mavericks dependency" do
-    allow(MacOS).to receive(:version).and_return(MacOS::Version.new("10.7"))
-    subject.add ant: :build
-    expect(subject.deps.find { |dep| dep.name == "ant" }).to be nil
-  end
-
   specify "Resource xz pre-Mavericks dependency" do
     allow(MacOS).to receive(:version).and_return(MacOS::Version.new("10.8"))
     resource = Resource.new
diff --git a/Library/Homebrew/test/rubocops/lines_cop_spec.rb b/Library/Homebrew/test/rubocops/lines_cop_spec.rb
index 0d2146339..ee1de059c 100644
--- a/Library/Homebrew/test/rubocops/lines_cop_spec.rb
+++ b/Library/Homebrew/test/rubocops/lines_cop_spec.rb
@@ -717,19 +717,6 @@ describe RuboCop::Cop::FormulaAudit::Miscellaneous do
       RUBY
     end
 
-    it "deprecated ENV.fortran usage" do
-      expect_offense(<<~RUBY)
-        class Foo < Formula
-          desc "foo"
-          url 'http://example.com/foo-1.0.tgz'
-          test do
-            ENV.fortran
-            ^^^^^^^^^^^ Use `depends_on :fortran` instead of `ENV.fortran`
-          end
-        end
-      RUBY
-    end
-
     it "deprecated ARGV.include? (--HEAD) usage" do
       expect_offense(<<~RUBY)
         class Foo < Formula