xplanet: adding with-all dependency option

Adding a "with-all" option so that the necessary dependencies installed
with Xplanet match Xplanet's default configuration options, namely: PNM
support via netpbm, TrueType support via freetype, and PANGOFT2 support
via pango. This will not include JPLs CSPICE library since that is not
a current formula. Assuming the user has followed the instructions to
install and link CSPICE in Homebrew, this updated formula will include
support for that as well.

Closes Homebrew/homebrew#27403.

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

Formula/xplanet.rb

@@ -6,13 +6,21 @@ class Xplanet < Formula
   sha1 '7c5208b501b441a0184cbb334a5658d0309d7dac'
 
   option "with-x", "Build for X11 instead of Aqua"
+  option "with-all", "Build with default Xplanet configuration dependencies except JPL CSPICE (manual install)"
 
   depends_on 'pkg-config' => :build
+  depends_on "libpng"
   depends_on 'jpeg'
   depends_on 'giflib'
   depends_on 'libtiff'
   depends_on :x11
 
+  if build.with? "all"
+    depends_on "netpbm"
+    depends_on "freetype"
+    depends_on "pango"
+  end
+
   def install
     args = %W[
       --disable-dependency-tracking
@@ -24,6 +32,12 @@ class Xplanet < Formula
       args << "--with-aqua" << "--without-x"
     end
 
+    if build.with? "all"
+      netpbm = Formula["netpbm"].opt_prefix
+      ENV.append 'CPPFLAGS', "-I#{netpbm}/include/netpbm"
+      ENV.append 'LDFLAGS', "-L#{netpbm}/lib"
+    end
+
     system "./configure", *args
     system "make install"
   end