ZSH plugin for XDG Base Directory Specification environment variables

xdg.plugin.zsh

if case $(uname) in
    Linux)
        XDG_CONFIG_DIRS=/etc/xdg
        XDG_BIN_HOME=~/.local/bin
        XDG_CACHE_HOME=~/.cache
        XDG_DATA_DIRS=/usr/local/share:/usr/share
        XDG_CONFIG_HOME=~/.config
        XDG_DATA_HOME=~/.local/share
        XDG_RUNTIME_DIR=/run/user/$(id -u)
        XDG_STATE_HOME=~/.local/state
        ;;
    Darwin)
        XDG_BIN_HOME=~/Library/'Application Support'/.local/bin
        XDG_CACHE_HOME=$(getconf DARWIN_USER_CACHE_DIR)/.cache
        XDG_CONFIG_DIR=/Library/'Application Support'/.config
        XDG_CONFIG_HOME=~/Library/'Application Support'/.config
        XDG_DATA_DIRS=/Library/'Application Support'/.local/share:/usr/local/share:/usr/share
        XDG_DATA_HOME=~/Library/'Application Support'/.local/share
        XDG_RUNTIME_DIR=$(getconf DARWIN_USER_TEMP_DIR)
        XDG_STATE_HOME=~/Library/'Application Support'/.local/state
        ;;
    *)
        echo >&2 "$(uname) is not yet supported."
        false
        ;;
esac then
    typeset -xUT XDG_CONFIG_DIRS xdg_config_dirs :
    typeset -xUT XDG_DATA_DIRS xdg_data_dirs :
    typeset -x XDG_BIN_HOME XDG_CACHE_HOME XDG_CONFIG_HOME XDG_DATA_HOME XDG_RUNTIME_DIR XDG_STATE_HOME
    mkdir -p "$XDG_BIN_HOME" "$XDG_CACHE_HOME" "$XDG_CONFIG_HOME" "$XDG_DATA_HOME" "$XDG_STATE_HOME"
fi

Sets variables according to the XDG Base Directory Specification. Tailored for macOS with reference to File System Basics. See in particular its advice regarding ~/Library/Preferences that:

You should not create files in this directory yourself

… hence XDG_CONFIG_HOME not using it.

Do let me know if you've any references that'll guide changes!