PKGBUILD-rubygem: add variable for gem name

Signed-off-by: matt mooney <mfm@muteddisk.com>

prototypes/PKGBUILD-rubygem.proto

@@ -7,7 +7,8 @@
 # information on Ruby Gem packaging.
 
 # Maintainer: Your Name <youremail@domain.com>
-pkgname=ruby-GEMNAME
+_gemname=GEMNAME
+pkgname=ruby-$_gemname
 pkgver=VERSION
 pkgrel=1
 pkgdesc=""
@@ -16,18 +17,18 @@ url=""
 license=('GPL')
 depends=(ruby) # Full dependency information is available in the yaml specification
 makedepends=(rubygems)
-source=(http://gems.rubyforge.org/gems/GEMNAME-$pkgver.gem)
-noextract=(GEMNAME-$pkgver.gem)
+source=(http://gems.rubyforge.org/gems/$_gemname-$pkgver.gem)
+noextract=($_gemname-$pkgver.gem)
 md5sums=()
 
 package() {
   cd "$srcdir"
-  # _gemdir is defined inside package() because if ruby[gems] is not installed on the system
-  # makepkg will exit with an error when sourcing the PKGBUILD
+  # _gemdir is defined inside package() because if ruby[gems] is not installed on
+  # the system, makepkg will exit with an error when sourcing the PKGBUILD.
   local _gemdir="$(ruby -rubygems -e'puts Gem.default_dir')"
 
   gem install --ignore-dependencies -i "$pkgdir$_gemdir" -n "$pkgdir/usr/bin" \
-    "GEMNAME-$pkgver.gem"
+    "$_gemname-$pkgver.gem"
 }
 
 # vim:set ts=2 sw=2 et: