qca: add options for head, qt5, api docs and building all plugins

Closes Homebrew/homebrew#34530.

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

Formula/qca.rb

@@ -5,21 +5,54 @@ class Qca < Formula
   url "http://delta.affinix.com/download/qca/2.0/qca-2.1.0.tar.gz"
   sha1 "2b582b3ccc7e6098cd14d6f52a829ae1539e9cc8"
 
+  head "git://anongit.kde.org/qca.git", :branch => "master"
+
   bottle do
     sha1 "3ff5e09bb690122d807b48470cf1bbafcca89b41" => :yosemite
     sha1 "f01d8cbd41c97068185af2f4c6efdec8ff0c6ce7" => :mavericks
     sha1 "4638b43c0ce83a2cccc64d678c7eefffd1844ba3" => :mountain_lion
   end
 
+  option "with-api-docs", "Build API documentation"
+
   depends_on "cmake" => :build
   depends_on "pkg-config" => :build
-  depends_on "qt"
+  depends_on "qt" => :recommended
-  depends_on "openssl"
+  depends_on "qt5" => :optional
+
+  # Plugins (QCA needs at least one plugin to do anything useful)
+  depends_on "openssl" # qca-ossl
+  depends_on "botan" => :optional # qca-botan
+  depends_on "libgcrypt" => :optional # qca-gcrypt
+  depends_on "gnupg" => :optional # qca-gnupg
+  depends_on "nss" => :optional # qca-nss
+  depends_on "pkcs11-helper" => :optional # qca-pkcs11
+
+  if build.with? "api-docs"
+    depends_on "graphviz" => :build
+    depends_on "doxygen" => [:build, "with-dot"]
+  end
 
   def install
-    mkdir "build" do
+    odie "Qt dependency must be defined" if build.without?("qt") && build.without?("qt5")
-      system "cmake", "..", *std_cmake_args
+
+    args = std_cmake_args
+    args << "-DQT4_BUILD=#{build.with?("qt5") ? "OFF" : "ON"}"
+    args << "-DBUILD_TESTS=OFF"
+
+    # Plugins (qca-ossl, qca-cyrus-sasl, qca-logger, qca-softstore always built)
+    args << "-DWITH_botan_PLUGIN=#{build.with?("botan") ? "YES" : "NO"}"
+    args << "-DWITH_gcrypt_PLUGIN=#{build.with?("libgcrypt") ? "YES" : "NO"}"
+    args << "-DWITH_gnupg_PLUGIN=#{build.with?("gnupg") ? "YES" : "NO"}"
+    args << "-DWITH_nss_PLUGIN=#{build.with?("nss") ? "YES" : "NO"}"
+    args << "-DWITH_pkcs11_PLUGIN=#{build.with?("pkcs11-helper") ? "YES" : "NO"}"
+
+    system "cmake", ".", *args
     system "make", "install"
+
+    if build.with? "api-docs"
+      system "make", "doc"
+      doc.install "apidocs/html"
     end
   end