Fix z sourcing

modules/z/init.zsh

@@ -5,13 +5,23 @@
 #   Sorin Ionescu <sorin.ionescu@gmail.com>
 #
 
-if [[ -f /etc/profile.d/z.zsh ]]; then
-  source /etc/profile.d/z.zsh
-elif [[ -f /opt/local/etc/profile.d/z.zsh ]]; then
-  source /opt/local/etc/profile.d/z.zsh
-elif [[ -f "$(brew --prefix 2> /dev/null)/etc/profile.d/z.sh" ]]; then
-  source "$(brew --prefix 2> /dev/null)/etc/profile.d/z.sh"
-fi
+_z_prefixes=(
+  ''
+  '/usr/local'
+  '/opt/local'
+  "$(brew --prefix 2> /dev/null)"
+)
+
+for _z_prefix in "$_z_prefixes[@]"; do
+  _z_sh="${_z_prefix}/etc/profile.d/z.sh"
+
+  if [[ -f "$_z_sh" ]]; then
+    source "$_z_sh"
+    break
+  fi
+done
+
+unset _z_prefix{es,} _z_sh
 
 if (( $+functions[_z] )); then
   alias z='nocorrect _z 2>&1'