fix

lib/self-upgrade.bash

@@ -6,6 +6,14 @@
 
 # MAIN
 
-[ "$UID" -ne 0 ] && echo 'root privilege required' && exit 1
+[[ "$UID" -ne 0 ]] && echo 'root privilege required' && exit 1
 
-echo TODO: self-upgrade
+current=$(miaou-bash --version)
+latest=$("$MIAOU_BASH_DIR/tools/wget_semver" artcode miaou/miaou-bash)
+
+if [[ "$current" == "$latest" ]]; then
+  echo "up-to-date version: $current"
+  MIAOU_BASH_DIR='' source ../install.sh
+else
+  MIAOU_BASH_DIR='' source ../install.sh
+fi