Use pkgname extraction code from customizepkg.

This reverts commit edea970001.

home/dotfiles/local/bin/makepkg-customizepkg

@@ -20,7 +20,15 @@ function is_readable_file {
 
 if  is_readable_file "$pkgbuild_path" &&
     ! is_readable_file "$pkgbuild_copy_path";then
-  customizepkg --modify
+  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}/${pkgname}"
+    if  is_readable_file "$global_conf_path" ||
+        is_readable_file "$user_conf_path";then
+      customizepkg --modify
+    fi
+  fi
 fi
 
 exec /usr/bin/makepkg ${@}