ksh 93u+

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Closes Homebrew/legacy-homebrew#26644.

Formula/ksh.rb

@@ -0,0 +1,53 @@
+require "formula"
+
+class KshDownloadStrategy < NoUnzipCurlDownloadStrategy
+  # AT&T requires the following credentials to "assent" to the OSS license.
+  def credentials
+    "I.accept.www.opensource.org.licenses.eclipse:."
+  end
+
+  def curl(*args)
+    args << "-u" << credentials
+    super
+  end
+end
+
+class Ksh < Formula
+  homepage "http://www.kornshell.com"
+  url  "http://www2.research.att.com/~astopen/download/tgz/ast-ksh.2012-08-01.tgz",
+    :using => KshDownloadStrategy
+  sha1 "316428e9937806183a134aa1669dea40c3a73695"
+  version "93u+" # Versioning scheme: + means "+ patches", - means "beta/alpha".
+
+  resource "init" do
+    url "http://www2.research.att.com/~astopen/download/tgz/INIT.2012-08-01.tgz",
+      :using => KshDownloadStrategy
+    sha1 "0b472a615db384fe707042baaa3347dc1aa1c81e"
+  end
+
+  def install
+    (buildpath/"lib/package/tgz").install resource("init"), Dir["*.tgz"]
+
+    system "tar", "xzf", "lib/package/tgz/INIT.2012-08-01.tgz"
+    system "/bin/ksh", "bin/package", "read"
+
+    # Needed due to unusal build system.
+    ENV["HOMEBREW_CCCFG"] += "O"
+
+    # From Apple"s ksh makefile.
+    kshcppdefines = "-DSHOPT_SPAWN=0 -D_ast_int8_t=int64_t -D_lib_memccpy"
+    system "/bin/ksh", "bin/package", "make", "CCFLAGS=#{kshcppdefines}"
+
+    bin.install "arch/darwin.i386-64/bin/ksh" => "ksh93"
+    ln_s "#{bin}/ksh93", "#{bin}/ksh"
+
+    man1.install "arch/darwin.i386-64/man/man1/sh.1" => "ksh93.1"
+    ln_s "#{man}/ksh93.1", "#{man}/ksh.1"
+  end
+
+  def caveats; <<-EOS.undent
+    We have agreed to the Eclipse Public License on your behalf.
+    If this is unacceptable for any reason, please uninstall.
+    EOS
+  end
+end