mdk 1.2.8 (new formula)

Add the GNU MDK suite (an implementation of Don Knuth's MIX computer
from "The Art of Computer Programming."

Closes Homebrew/legacy-homebrew#36180.

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

Formula/mdk.rb

@@ -0,0 +1,52 @@
+class Mdk < Formula
+  homepage "https://www.gnu.org/software/mdk/mdk.html"
+  url "http://ftpmirror.gnu.org/mdk/v1.2.8/mdk-1.2.8.tar.gz"
+  mirror "https://ftp.gnu.org/gnu/mdk/v1.2.8/mdk-1.2.8.tar.gz"
+  sha1 "43bd40a48f88b3458c3bb6ccfd62d254b85c5fb8"
+
+  depends_on "gtk+3"
+  depends_on "glib"
+  depends_on "libglade"
+  depends_on "flex"
+  depends_on "guile"
+  depends_on "intltool" => :build
+  depends_on "pkg-config" => :build
+
+  def install
+    system "./configure", "--disable-debug",
+                          "--disable-dependency-tracking",
+                          "--disable-silent-rules",
+                          "--prefix=#{prefix}"
+    system "make", "install"
+  end
+
+  test do
+    (testpath/"hello.mixal").write <<-EOS.undent
+      *                                                        (1)
+      * hello.mixal: say "hello world" in MIXAL                (2)
+      *                                                        (3)
+      * label ins    operand     comment                       (4)
+      TERM    EQU    19          the MIX console device number (5)
+              ORIG   1000        start address                 (6)
+      START   OUT    MSG(TERM)   output data at address MSG    (7)
+              HLT                halt execution                (8)
+      MSG     ALF    "MIXAL"                                   (9)
+              ALF    " HELL"                                   (10)
+              ALF    "O WOR"                                   (11)
+              ALF    "LD"                                      (12)
+              END    START       end of the program            (13)
+    EOS
+    system "#{bin}/mixasm",  "hello"
+    output = `#{bin}/mixvm -r hello`
+
+    expected =  <<-EOS.undent
+      Program loaded. Start address: 1000
+      Running ...
+      MIXAL HELLO WORLDXXX
+      ... done
+    EOS
+    expected = expected.gsub("XXX", " " *53)
+
+    assert_equal expected, output
+  end
+end