moc: fix build failure against FFmpeg 3.0

Upstream's next release may not be too soon (still awaiting maintainer
feedback on ETA). Meanwhile, maintainer has confirmed that r2779 on the
2.5 branch is the revision that fixes FFmpeg 3.0 compatibility (see
http://moc.daper.net/node/1496), and backporting it to 2.5.0 (the inline
patch in this commit) was a success.

The caveat is that we now need to run autoreconf unconditionally,
because Makefiles have to be regenerated after we patch ffmpeg.m4.

I also added a nonsubstantial test (there's no way to write a
substantial test, due to the nature of this tool).

Closes Homebrew/homebrew#49359.

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

Formula/moc.rb

@@ -1,8 +1,20 @@
 class Moc < Formula
   desc "Terminal-based music player"
   homepage "http://moc.daper.net"
-  url "http://ftp.daper.net/pub/soft/moc/stable/moc-2.5.0.tar.bz2"
-  sha256 "d29ea52240af76c4aa56fa293553da9d66675823e689249cee5f8a60657a6091"
+  revision 1
+  head "svn://daper.net/moc/trunk"
+
+  stable do
+    url "http://ftp.daper.net/pub/soft/moc/stable/moc-2.5.0.tar.bz2"
+    sha256 "d29ea52240af76c4aa56fa293553da9d66675823e689249cee5f8a60657a6091"
+
+    # Backport r2779: Adapt to FFmpeg/LibAV's audioconvert.h rename (commit 5980f5dd).
+    # Necessary for building against FFmpeg 3.0. See http://moc.daper.net/node/1496.
+    patch do
+      url "https://raw.githubusercontent.com/Homebrew/patches/1282e60/moc/moc-2.5.0.diff"
+      sha256 "1a7d2d7f967c8182db01dd95d5a05aac8f2acae2eac6fcda419baaed068bc8ef"
+    end
+  end
 
   bottle do
     revision 1
@@ -11,16 +23,11 @@ class Moc < Formula
     sha256 "94cca91c117a1575aa61a10f288e95672e61bfe0c1d473b2fac70c480c0d92ab" => :mountain_lion
   end
 
-  head do
-    url "svn://daper.net/moc/trunk"
-
-    depends_on "autoconf" => :build
-    depends_on "automake" => :build
-    depends_on "gettext" => :build
-  end
-
   option "with-ncurses", "Build with wide character support."
 
+  depends_on "autoconf" => :build
+  depends_on "automake" => :build
+  depends_on "gettext" => :build
   depends_on "pkg-config" => :build
   depends_on "libtool" => :run
   depends_on "berkeley-db"
@@ -38,7 +45,7 @@ class Moc < Formula
   depends_on "homebrew/dupes/ncurses" => :optional
 
   def install
-    system "autoreconf", "-fvi" if build.head?
+    system "autoreconf", "-fvi"
     system "./configure", "--disable-debug", "--prefix=#{prefix}"
     system "make", "install"
   end
@@ -51,4 +58,8 @@ class Moc < Formula
             --with-ncurses
     EOS
   end
+
+  test do
+    assert_match version.to_s, shell_output("#{bin}/mocp --version")
+  end
 end