opensc 0.13.0

Closes Homebrew/homebrew#17089.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/opensc.rb

@@ -0,0 +1,52 @@
+require 'formula'
+
+class Opensc < Formula
+  homepage 'https://github.com/OpenSC/OpenSC/wiki'
+  url 'http://sourceforge.net/projects/opensc/files/OpenSC/opensc-0.13.0/opensc-0.13.0.tar.gz'
+  sha1 '9285ccbed7b49f63e488c8fb1b3e102994a28218'
+  head 'https://github.com/OpenSC/OpenSC.git'
+
+  if build.head?
+    depends_on :automake
+    depends_on :libtool
+  end
+
+  option 'with-man-pages', 'Build manual pages'
+
+  depends_on 'docbook' if build.include? 'with-man-pages'
+
+  def install
+    extra_args = []
+
+    # If OpenSC's configure script detects docbook it will build manual
+    # pages. This extends the spirit of that logic to support homebrew
+    # installed docbook.
+    docbook = Formula.factory 'docbook'
+    if docbook.installed?
+      # Docbookxsl is a Formula defined in docbook.rb. Formula.factory
+      # for 'docbook' will cause 'docbook.rb' to be required, which
+      # makes Docbookxsl available. It would be nice if this didn't
+      # depend on internal implementation details of the docbook
+      # formula.
+      docbookxsl = Docbookxsl.new
+
+      # OpenSC looks in a set of common paths for docbook's xsl files,
+      # but not in /usr/local, and certainly not in homebrew's
+      # cellar. This specifies the correct homebrew path.
+      extra_args << "--with-xsl-stylesheetsdir=" +
+        docbook.prefix/docbookxsl.catalog
+    end
+
+    system "./bootstrap" if build.head?
+    system "./configure", "--disable-dependency-tracking",
+                          "--prefix=#{prefix}",
+                          *extra_args
+
+    system "make install"
+  end
+
+  def caveats; <<-EOS.undent
+    Manual pages will be installed if docbook is installed.
+    EOS
+  end
+end