Deprecate requirements harder

Remove more Requirement logic to enable future removal of default
formula logic. Also, output deprecations, convert symbol requirement
usage to deps and simplify the compatibility code for the direct
Requirement usage.

1 files changed, 107 insertions, 49 deletions

diff --git a/Library/Homebrew/compat/requirements.rb b/Library/Homebrew/compat/requirements.rb
index 304dd2504..bffc5f5f1 100644
--- a/Library/Homebrew/compat/requirements.rb
+++ b/Library/Homebrew/compat/requirements.rb
@@ -1,76 +1,134 @@
 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
+class CVSRequirement < Requirement
   fatal true
-  default_formula "mysql"
-  satisfy { which "mysql_config" }
+  satisfy do
+    odeprecated("CVSRequirement", "'depends_on \"cvs\"'")
+    which "cvs"
+  end
 end
 
-class PostgresqlRequirement < Requirement
+class EmacsRequirement < Requirement
   fatal true
-  default_formula "postgresql"
-  satisfy { which "pg_config" }
+  satisfy do
+    odeprecated("EmacsRequirement", "'depends_on \"cvs\"'")
+    which "emacs"
+  end
 end
 
-class RbenvRequirement < Requirement
+class FortranRequirement < Requirement
   fatal true
-  default_formula "rbenv"
-  satisfy { which "rbenv" }
+  satisfy do
+    odeprecated("FortranRequirement", "'depends_on \"cvs\"'")
+    which "gfortran"
+  end
 end
 
-class CVSRequirement < Requirement
+class GitRequirement < Requirement
+  fatal true
+  satisfy do
+    odeprecated("GitRequirement", "'depends_on \"cvs\"'")
+    which "git"
+  end
+end
+
+class GPG2Requirement < Requirement
   fatal true
-  default_formula "cvs"
-  satisfy { which "cvs" }
+  satisfy do
+    odeprecated("GPG2Requirement", "'depends_on \"cvs\"'")
+    which "gpg"
+  end
 end
 
 class MercurialRequirement < Requirement
   fatal true
-  default_formula "mercurial"
-  satisfy { which "hg" }
+  satisfy do
+    odeprecated("MercurialRequirement", "'depends_on \"cvs\"'")
+    which "hg"
+  end
 end
 
-class GPG2Requirement < Requirement
+class MPIRequirement < Requirement
   fatal true
-  default_formula "gnupg"
-  satisfy { which "gpg" }
+  satisfy do
+    odeprecated("MPIRequirement", "'depends_on \"cvs\"'")
+    which "mpicc"
+  end
 end
 
-class GitRequirement < Requirement
+class MysqlRequirement < Requirement
+  fatal true
+  satisfy do
+    odeprecated("MysqlRequirement", "'depends_on \"cvs\"'")
+    which "mysql_config"
+  end
+end
+
+class PerlRequirement < Requirement
+  fatal true
+  satisfy do
+    odeprecated("PerlRequirement", "'depends_on \"cvs\"'")
+    which "perl"
+  end
+end
+
+class PostgresqlRequirement < Requirement
+  fatal true
+  satisfy do
+    odeprecated("PostgresqlRequirement", "'depends_on \"cvs\"'")
+    which "pg_config"
+  end
+end
+
+class PythonRequirement < Requirement
+  fatal true
+  satisfy do
+    odeprecated("PythonRequirement", "'depends_on \"cvs\"'")
+    which "python"
+  end
+end
+
+class Python3Requirement < Requirement
   fatal true
-  default_formula "git"
-  satisfy { Utils.git_available? }
+  satisfy do
+    odeprecated("Python3Requirement", "'depends_on \"cvs\"'")
+    which "python3"
+  end
+end
+
+class RbenvRequirement < Requirement
+  fatal true
+  satisfy do
+    odeprecated("RbenvRequirement", "'depends_on \"cvs\"'")
+    which "rbenv"
+  end
+end
+
+class RubyRequirement < Requirement
+  fatal true
+  satisfy do
+    odeprecated("RubyRequirement", "'depends_on \"cvs\"'")
+    which "ruby"
+  end
 end
 
 class SubversionRequirement < Requirement
   fatal true
-  default_formula "subversion"
-  satisfy { Utils.svn_available? }
-end
-
-XcodeDependency            = XcodeRequirement
-MysqlDependency            = MysqlRequirement
-PostgresqlDependency       = PostgresqlRequirement
-GPGDependency              = GPG2Requirement
-GPGRequirement             = GPG2Requirement
-TeXDependency              = TeXRequirement
-MercurialDependency        = MercurialRequirement
-GitDependency              = GitRequirement
-FortranDependency          = FortranRequirement
-JavaDependency             = JavaRequirement
-LanguageModuleDependency   = LanguageModuleRequirement
-MPIDependency              = MPIRequirement
-OsxfuseDependency          = OsxfuseRequirement
-PythonDependency           = PythonRequirement
-TuntapDependency           = TuntapRequirement
-X11Dependency              = X11Requirement
-ConflictsWithBinaryOsxfuse = NonBinaryOsxfuseRequirement
-MinimumMacOSRequirement    = MacOSRequirement
+  satisfy do
+    odeprecated("SubversionRequirement", "'depends_on \"cvs\"'")
+    which "svn"
+  end
+end
+
+class TeXRequirement < Requirement
+  fatal true
+  cask "mactex"
+  download "https://www.tug.org/mactex/"
+  satisfy do
+    odeprecated("TeXRequirement", "'depends_on \"cvs\"'")
+    which("tex") || which("latex")
+  end
+end
+
+MinimumMacOSRequirement = MacOSRequirement