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windowscommon-lisphidden-filesallegro-cl

Creating a hidden file in Common Lisp

Since hidden files on a Unix platform simply start with a period, it is trivial to create one using Common Lisp. Hidden files on Windows machines are defined differently. They have a file attribute that indicates whether they are hidden. How can one create these type of files using Common Lisp? I'm using Allegro CL on Windows.

Solution

  • The ANSI CL standard offers no such functionality. Your vendor might provide it though.

    How about file-hidden-p:

    (setf (file-hidden-p "my-file") t)

    PS. Note that I have not used Allegro for over 15 years. The information above is from Google:

    1. search for allegro lisp file attribute
    2. first hit
    3. click on PermutedIndex
    4. click on A and find file-attributes
    5. read the doc and see file-hidden-p

    Still, as I said before - do not hesitate to ask ;-)