The registry is a file that the mappy package maintains so that shortcuts
can persist across sessions. By default, it resides in
but you can change this by setting
options(mappy.file = "/your/file").
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character. The name of the shortcut to store.
expression. The R expression to attach to this shortcut.
registerstores the named expression in the registry so it will be
restored when the mappy package is re-attached in a new session.
deregisterremoves the named expression from the registry
the registry will be auto-loaded into the global environment when the mappy package is attached.
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