#!/bin/bash

post_install() {

	create_cache_dirs

	echo
	echo "Prezto is enabled for all users by default."
	echo "To change that, edit /etc/zsh/zshrc file."
	echo "Global settings reside in the /etc/zsh/ directory."
	echo "To personalize Zsh and Prezto, edit your local ~/.zshrc and ~/.zpreztorc files."
	echo "A user can also have a custom, overriding Prezto installation in ~/.zprezto/"
	echo "For more information on overrides and local files, see https://github.com/sorin-ionescu/prezto/tree/master/runcoms"
	echo
}

post_upgrade() {
	create_cache_dirs
}

post_remove() {
	remove_cache_dirs
}

cachedir=/var/cache/prezto
moduledir=/usr/lib/prezto/modules

# These modules (as of 20130820) want to have the cache within their own directory
modules_with_cache=(
	'node'
	'fasd'
	'perl'
)

create_cache_dirs() {

	# Set up a global cache that's accessible by users.
	# A user may be able to override this by loading and configuring/customizing the modules in her own .zshrc
	mkdir -p $cachedir

	for module in "${modules_with_cache[@]}"
	do
		if [ ! -f $cachedir/$module/cache.zsh ]; then
			mkdir $cachedir/$module
			touch $cachedir/$module/cache.zsh
			chgrp users $cachedir/$module/cache.zsh
			chmod g+w $cachedir/$module/cache.zsh
		fi 

		if [ ! -a $moduledir/$module/cache.zsh ]; then
			ln -sf $cachedir/$module/cache.zsh $moduledir/$module/cache.zsh
		fi
	done
}

remove_cache_dirs() {

	# Remove symlinks that point to cache files
	for module in "${modules_with_cache[@]}"
	do
		rm -rf $moduledir/$module/cache.zsh
	done

	# Remove the global cache
	rm -rf $cachedir
}