libmill 1.0; import from dev-only

Closes Homebrew/homebrew#45512.

Signed-off-by: Baptiste Fontaine <batifon@yahoo.fr>

Formula/libmill.rb

@@ -0,0 +1,43 @@
+class Libmill < Formula
+  desc "Go-style concurrency in C"
+  homepage "http://libmill.org/"
+  url "http://libmill.org/libmill-1.0.tar.gz"
+  sha256 "746fd55c4ae31b8c2142c9a413a4dacfb47e3db970ec7ea5bc4053525f9c12e0"
+  head "https://github.com/sustrik/libmill.git"
+
+  depends_on "autoconf" => :build
+  depends_on "automake" => :build
+  depends_on "libtool" => :build
+  depends_on "cmake" => :build
+
+  def install
+    system "./autogen.sh" if build.head?
+    system "./configure", "--prefix=#{prefix}"
+    system "make", "all", "check", "install"
+  end
+
+  test do
+    (testpath/"test.c").write <<-EOS.undent
+      #include <stdio.h>
+      #include <libmill.h>
+
+      void worker(int count, const char *text) {
+          int i;
+          for(i = 0; i != count; ++i) {
+              printf("%s\\n", text);
+              msleep(10);
+          }
+      }
+
+      int main() {
+          go(worker(4, "a"));
+          go(worker(2, "b"));
+          go(worker(3, "c"));
+          msleep(100);
+          return 0;
+      }
+    EOS
+    system ENV.cc, "test.c", "-L#{lib}", "-lmill", "-o", "test"
+    system "./test"
+  end
+end