Use pkgname extraction code from customizepkg.

home/dotfiles/local/bin/makepkg-customizepkg

@@ -20,7 +20,7 @@ function is_readable_file {
 
 if  is_readable_file "$pkgbuild_path" &&
     ! is_readable_file "$pkgbuild_copy_path";then
-  source "$pkgbuild_path"
+  eval $(grep -Pazo '[^[:print:]][[:blank:]]*_?(pkg.*|name)=(\((.|\n)*?\)|[^#]*?(?= *#|\x0a))' ./PKGBUILD | grep -Eva '\$\(|`|pkgdesc')
   if [[ -n "${pkgname:-''}" ]];then
     global_conf_path="${GLOBAL_CONF_DIR_PATH}/${pkgname}"
     user_conf_path="${USER_CONF_DIR_PATH}/${pkgname}"