auctex: import from homebrew/tex.

That tap is being killed and this was the most popular formula.

Formula/auctex.rb

@@ -0,0 +1,55 @@
+class Auctex < Formula
+  desc "Emacs package for writing and formatting TeX"
+  homepage "https://www.gnu.org/software/auctex/"
+  url "https://ftpmirror.gnu.org/auctex/auctex-11.90.tar.gz"
+  mirror "https://ftp.gnu.org/gnu/auctex/auctex-11.90.tar.gz"
+  sha256 "3c232fd8e57780edea28cd3035afcc2b6ed965b5954e96b34a258cacfcaaf18f"
+
+  head do
+    url "http://git.savannah.gnu.org/cgit/auctex.git"
+    depends_on "autoconf" => :build
+  end
+
+  depends_on :tex
+  depends_on :emacs => "21.1"
+
+  def install
+    # configure fails if the texmf dir is not there yet
+    (share/"texmf").mkpath
+
+    system "./autogen.sh" if build.head?
+    system "./configure", "--prefix=#{prefix}",
+                          "--with-texmf-dir=#{share}/texmf",
+                          "--with-emacs=#{which "emacs"}",
+                          "--with-lispdir=#{elisp}"
+    system "make"
+    ENV.deparallelize # Needs a serialized install
+    system "make", "install"
+  end
+
+  def caveats
+    <<-EOS.undent
+    texmf files have been installed into:
+      #{HOMEBREW_PREFIX}/share/texmf
+
+    You can add it to your TEXMFHOME using:
+      sudo tlmgr conf texmf TEXMFHOME "~/Library/texmf:#{HOMEBREW_PREFIX}/share/texmf"
+    EOS
+  end
+
+  test do
+    (testpath/".emacs").write <<-EOS.undent
+      (add-to-list 'load-path "#{elisp}")
+      (require 'tex-site)
+    EOS
+    (testpath/"test.tex").write <<-'EOS'.undent
+      \documentclass{article}
+      \begin{document}
+      This file is incomplete.
+    EOS
+    system "emacs", "-l", testpath/".emacs", "--batch", "test.tex",
+      "--eval=(goto-char (point-max))", "--eval=(LaTeX-close-environment)",
+      "-f", "save-buffer"
+    assert_equal '\end{document}', File.read("test.tex").lines.last.chomp
+  end
+end