fix pkgver

.SRCINFO

@@ -1,6 +1,6 @@
 pkgbase = vim-arduino-syntax-git
 	pkgdesc = Arduino syntax files for Vim
-	pkgver = 83f766d
+	pkgver = r17.83f766d
 	pkgrel = 1
 	url = https://github.com/sudar/vim-arduino-syntax
 	arch = any

PKGBUILD

@@ -2,7 +2,7 @@
 
 pkgname=vim-arduino-syntax-git
 _pkgname=vim-arduino-syntax
-pkgver=83f766d
+pkgver=r17.83f766d
 pkgrel=1
 url=https://github.com/sudar/vim-arduino-syntax
 pkgdesc="Arduino syntax files for Vim"
@@ -11,6 +11,11 @@ depends=(vim)
 source=("git://github.com/sudar/vim-arduino-syntax.git")
 md5sums=(SKIP)
 
+pkgver() {
+    cd "${srcdir}/${_pkgname}"
+    printf 'r%s.%s' "$(git rev-list --count HEAD)" "$(git rev-parse --short HEAD)"
+}
+
 package() {
     cd "${srcdir}/${_pkgname}"
     for dir in ftdetect indent syntax