lcm 1.3.0 (new formula)

Add formula for Lightweight Communications and Marshalling ([LCM]),
using release 1.3.0 from github.

Optionally use HEAD of LCM git repository.

Confirmed working sandbox install and test on OSX 10.10.5 with Java
Version 8 Update 25.

One else statement in this Formula should be removed after an LCM release
incorporating pull request Homebrew/homebrew#48, as noted in comments.

Closes Homebrew/homebrew#44455.

Signed-off-by: Dominyk Tiller <dominyktiller@gmail.com>

Formula/lcm.rb

@@ -0,0 +1,65 @@
+class Lcm < Formula
+  desc "libraries and tools for message passing and data marshalling"
+  homepage "https://lcm-proj.github.io/"
+  url "https://github.com/lcm-proj/lcm/releases/download/v1.3.0/lcm-1.3.0.zip"
+  sha256 "23bce19a4a6dc5df444d811f57796e14b4b0d1886cb3c219f90b72f328f2184e"
+
+  head do
+    url "https://github.com/lcm-proj/lcm.git"
+
+    depends_on "xz" => :build
+    depends_on "libtool" => :build
+    depends_on "automake" => :build
+    depends_on "autoconf" => :build
+  end
+
+  depends_on "pkg-config" => :build
+  depends_on "glib"
+  depends_on :java => :recommended
+  depends_on :python => :optional
+  depends_on :python3 => :optional
+
+  def install
+    ENV.java_cache
+
+    if build.head?
+      system "./bootstrap.sh"
+    else
+      # This deparallelize setting can be removed after an upstream release
+      # that includes the revised makefile for the java part of LCM.
+      #
+      # (see https://github.com/lcm-proj/lcm/pull/48)
+      #
+      # Note that the pull request has been merged with the upstream master,
+      # so it will be included in the next release of LCM.
+      ENV.deparallelize
+    end
+
+    system "./configure", "--disable-dependency-tracking",
+                          "--disable-silent-rules",
+                          "--prefix=#{prefix}"
+    system "make", "install"
+  end
+
+  test do
+    (testpath/"example_t.lcm").write <<-EOS.undent
+      package exlcm;
+
+      struct example_t
+      {
+          int64_t timestamp;
+          double position[3];
+          string name;
+      }
+    EOS
+    system "#{bin}/lcm-gen", "-c", "example_t.lcm"
+    assert(File.exist?("exlcm_example_t.h"), "lcm-gen did not generate C header file")
+    assert(File.exist?("exlcm_example_t.c"), "lcm-gen did not generate C source file")
+    system "#{bin}/lcm-gen", "-x", "example_t.lcm"
+    assert(File.exist?("exlcm/example_t.hpp"), "lcm-gen did not generate C++ header file")
+    if build.with? "java"
+      system "#{bin}/lcm-gen", "-j", "example_t.lcm"
+      assert(File.exist?("exlcm/example_t.java"), "lcm-gen did not generate java file")
+    end
+  end
+end