zfunc

# Accelerate loading shell environment / init variables
# $1 name of cache entry  e.g. "rbenv-init"
# $2 command to generate e.g. "rbenv init -"
function cached_source() {
    local cache_file="$HOME/.cache/$1.zsh"
    # Optimize for cache file existing at the cost of an error message if it doesn't
    if ! source $cache_file ; then
        echo "Building $cache_file cache file using $2"
        if ! eval "$2 > $cache_file" ; then
            echo "Failed to execute $2"
            rm $cache_file
            return -1
        fi
        if ! source $cache_file ; then
            echo "Failed to generate $cache_file using $2"
            return -1
        else
            echo "Successfully generated $cache_file using $2"
            return 0
        fi
    else
        # Optimal / success path - load existing cache
        return 0
    fi
}