Maps a callback on the names of files in a specified directory and returns a list of those for which the callback returned true. The callback can retrieve information about the files.
fast-directory-files dir-pathname callback => result
fdf-handle-directory-p fdf-handle => directory-p
fdf-handle-directory-string fdf-handle => directory-string
fdf-handle-last-access fdf-handle => last-access
fdf-handle-last-modify fdf-handle => last-modify
fdf-handle-link-p fdf-handle => link-p
fdf-handle-size fdf-handle => size
fdf-handle-writable-p fdf-handle => writable-p
A pathname designator without wild characters in its directory path.
A function designator.
An opaque object used to retrieve information about a file in dir-pathname.
A list of strings.
directory-p, link-p, writable-p
last-access, last-modify, size
fast-directory-files maps the function callback on the names of the files in directory specified by dir-pathname, and returns a list of the names for which callback returned non-nil.
dir-pathname must be a pathname designator, which does not contain wild characters in its directory path. To be useful, it should either be a directory (with no name and type), or with wild name and/or type.
callback must be a function of two arguments, the name of the file and an opaque object which is referred to as the fdf-handle. The fdf-handle can be used to retrieve information about the file, by calling any of the
fdf-handle-* functions documented on this page.
fast-directory-files traverses the files that match dir-pathname in an undefined way, and for each file calls the callback with the file's name (not including the directory) and a fdf-handle. If callback returns non-nil it adds the name to a list. It returns the list of names for which the callback returned non-nil. Note that the names do not contain the directory name.
The fdf-handle can be accessed by the following readers. Functions named in parentheses would return the same value when called on the full path of the file:
fdf-handle-size returns the size of the file in bytes.
fdf-handle-last-modify returns the universal time of the last modification of the file (
fdf-handle-last-access returns the universal time of the last access of the file.
fdf-handle-directory-p is a predicate for whether the file is a directory (file-directory-p)
fdf-handle-link-p is a predicate for whether the file is a soft link (always returns
nil on Windows).
fdf-handle-writable-p is a predicate for whether the file is writable (file-writable-p).
fdf-handle-directory-string returns a string with the directory path followed by a separator. Therefore the full path of the file can be constructed by:
(string-append (fdf-handle-directory-string fdf-handle
The fdf-handle can be used only within the dynamic scope of the callback to which it was passed.
LispWorks User Guide and Reference Manual - 20 Sep 2017