prepare automatic updates

PKGBUILD

@@ -5,42 +5,44 @@
 
 # Maintainer: Marten Kante <tiyn@martenkante.eu>
 pkgname=st-tiyn-git
-pkgver=0.8.3.r40.083167e
+pkgver=0.8.2
 pkgrel=1
 epoch=
-pkgdesc="This is the st build of tiyn. It includes the alpha, anysize, font2, scrollback patches."
-arch=(x86_64 i686)
+pkgdesc="This is the st build of tiyn. It includes a bunch of patches."
+arch=('x86_64' 'i686')
 url="https://github.com/tiyn/st"
 license=('MIT')
 groups=()
-depends=(libxft-bgra)
+depends=('libxft-bgra')
 makedepends=(git)
 checkdepends=()
 optdepends=()
-provides=(st)
-conflicts=(st)
-replaces=(st)
+provides=('st')
+conflicts=('st')
+replaces=('st')
 backup=()
 options=()
 install=
 changelog=
-source=("git+$url")
+source=("${pkgname}::git+$url")
 noextract=()
 md5sums=('SKIP')
 validpgpkeys=()
 
 pkgver() {
-    cd "${_pkgname}"
-    printf "0.8.3.r%s.%s" "$(git rev-list --count HEAD)" "$(git rev-parse --short HEAD)"
+    cd "${pkgname}"
+    ( set -o pipefail
+      git describe --long 2>/dev/null | sed 's/\([^-]*-g\)/r\1/;s/-/./g' ||
+      printf "0.8.2.r%s.%s" "$(git rev-list --count HEAD)" "$(git rev-parse --short HEAD)")
 }
 
 build() {
-    cd st
+    cd "${pkgname}"
     make X11INC=/usr/include/X11 X11LIB=/usr/lib/X11
 }
 
 package() {
-    cd st
+    cd "${pkgname}"
     mkdir -p ${pkgdir}/opt/${pkgname}
     cp -rf * ${pkgdir}/opt/${pkgname}
     make PREFIX=/usr DESTDIR="${pkgdir}" install