ack: devel + HEAD

Closes Homebrew/homebrew#39535.

Signed-off-by: Tim D. Smith <git@tim-smith.us>

Formula/ack.rb

@@ -1,13 +1,44 @@
 class Ack < Formula
   homepage "http://beyondgrep.com/"
   url "http://beyondgrep.com/ack-2.14-single-file"
-  sha1 "49c43603420521e18659ce3c50778a4894dd4a5f"
+  sha256 "1d203cfbc52ce8f49e3992be1cd3e4d7d5dfb7daa3739e8628aa9858ccc5b9df"
   version "2.14"
 
+  head "https://github.com/petdance/ack2.git", :branch => "dev"
+
+  devel do
+    url "https://cpan.metacpan.org/authors/id/P/PE/PETDANCE/ack-2.15_01.tar.gz"
+    sha256 "dfd1df3def5d3b16af8a7c585fc8954362d4f2b097891919490c89fdb484fd83"
+  end
+
+  resource "File::Next" do
+    url "https://cpan.metacpan.org/authors/id/P/PE/PETDANCE/File-Next-1.12.tar.gz"
+    sha256 "cc3afd8eaf6294aba93b8152a269cc36a9df707c6dc2c149aaa04dabd869e60a"
+  end
+
   def install
-    bin.install "ack-#{version}-single-file" => "ack"
-    system "pod2man", "#{bin}/ack", "ack.1"
-    man1.install "ack.1"
+    if build.stable?
+      bin.install "ack-#{version}-single-file" => "ack"
+      system "pod2man", "#{bin}/ack", "ack.1"
+      man1.install "ack.1"
+    else
+      ENV.prepend_create_path "PERL5LIB", libexec/"lib/perl5"
+      ENV.prepend_path "PERL5LIB", libexec/"lib"
+
+      resource("File::Next").stage do
+        system "perl", "Makefile.PL", "INSTALL_BASE=#{libexec}"
+        system "make", "install"
+      end
+
+      system "perl", "Makefile.PL", "DESTDIR=#{buildpath}"
+      system "make"
+
+      libexec.install "ack"
+      chmod 0755, libexec/"ack"
+      (libexec/"lib").install "blib/lib/App"
+      (bin/"ack").write_env_script("#{libexec}/ack", :PERL5LIB => ENV["PERL5LIB"])
+      man1.install "blib/man1/ack.1"
+    end
   end
 
   test do