[zsh] Add homebrew site-functions to fpath

zsh/func/init_rc_configure_completion

@@ -1,7 +1,7 @@
 #!/usr/bin/env zsh
 # Eryn Wells <eryn@erynwells.me>
 
-autoload -U compinit
+autoload -Uz compinit
 compinit
 
 # Cache completions

zsh/func/init_rc_fpath_darwin

@@ -0,0 +1,17 @@
+# Eryn Wells <eryn@erynwells.me>
+
+autoload -Uz binary_exists
+
+function init_rc_fpath_darwin
+{
+    if binary_exists brew; then
+        local brew_fpath="$(brew --prefix)/share/zsh/site-functions"
+        if [[ -d "$brew_fpath" ]]; then
+            fpath+=($brew_fpath)
+        fi
+
+        export FPATH
+    fi
+}
+
+init_rc_fpath_darwin "$@"