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A way to write type-agnostic script/function runnables

I thought that I share a way of writing runnable objects in such a way
that they can be both invoked as a script and as a function. The main
contribution is a concise method of getting the directory path where
the object is located:

# Run as script? ZSH_SCRIPT is a Zsh 5.3 addition
if [[ $0 != example-script || -n $ZSH_SCRIPT ]]; then

    # Such global variable is expected to be typeset'd -g
    # in the plugin.zsh file. Here it's restored in case
    # of the function being ran as a script
    typeset MY_PLUGIN_DIR=${0:h}

The code is also available at Zplugin's repo – it is being added as an
example object when creating a plugin with the `create' subcommand:


I wonder if one could get the directory where the function is being
located directly, without the global *_DIR parameter? Without use of
the $*trace parameters (I don't trust them;).

Sebastian Gniazdowski
News: https://twitter.com/ZdharmaI
IRC: https://kiwiirc.com/client/chat.freenode.net:+6697/#zplugin
Blog: http://zdharma.org

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