Install symbol font in Arch Linux package

Refs #60.

packages/archlinux/.gitignore

@@ -1,3 +1,4 @@
 *
 !.gitignore
 !PKGBUILD
+!*.install

packages/archlinux/PKGBUILD

@@ -1,7 +1,7 @@
 # Maintainer: Kim Silkebækken <kim.silkebaekken+aur@gmail.com>
 
 pkgname=powerline-git
-pkgver=20130102
+pkgver=20130118
 pkgrel=1
 pkgdesc='The ultimate statusline/prompt utility.'
 url='https://github.com/Lokaltog/powerline'
@@ -9,6 +9,7 @@ license=('CC BY-SA 3.0')
 arch=('any')
 depends=('python2>=2.7')
 makedepends=('git' 'python2-distribute')
+install='powerline.install'
 source=()
 
 _gitroot="https://github.com/Lokaltog/powerline.git"
@@ -34,4 +35,7 @@ build() {
 
 	python2 setup.py build || return 1
 	python2 setup.py install --root=${pkgdir} || return 1
+
+	install -d "${pkgdir}/usr/share/fonts/TTF/"
+	install -m644 "powerline/fontpatcher/PowerlineSymbols.otf" "${pkgdir}/usr/share/fonts/TTF/PowerlineSymbols.otf"
 }

packages/archlinux/powerline.install

@@ -0,0 +1,21 @@
+post_install() {
+	echo "Updating font cache..."
+	fc-cache -f
+
+	echo "
+IMPORTANT
+---------
+
+Powerline requires custom glyphs to work properly. A font with these symbols 
+has been installed, and Powerline may work out of the box for you. If it 
+doesn't, please see the font installation instructions at 
+http://lokaltog.github.com/powerline/overview.html#font-installation for more 
+details (you can skip the first steps since the font has already been 
+installed on your system).
+"
+}
+
+post_remove() {
+	echo "Updating font cache..."
+	fc-cache -f
+}