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I would to do a specific action (create an org-mod link) when a new file appears in a given directory. For that I need to catch the event but also the path of the new file. I managed to use file-notify-add-watch function which is described here and its work very well, but the output is an "event". How to get a string from this event ?

thx

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As the documentation you linked to states:

When any event happens, Emacs will call the callback function passing it a single argument event, which is of the form

     (descriptor action file [file1])

where

file and file1 are the name of the file(s) whose event is being reported

So you could get the filename from event using (third event) (and/or fourth if multiple files changed).

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