92 lines
2.0 KiB
Plaintext
92 lines
2.0 KiB
Plaintext
The structure dir-streams defines procedures to represent and process
|
|
directories as streams of files and sub-directories.
|
|
|
|
(dir-stream-from-dir-name dir-name [chase?] [parent]) -> dir-stream
|
|
|
|
Constructor for dir-streams.
|
|
|
|
|
|
(dir-stream? thing) -> boolean
|
|
|
|
Type predicate for dir-streams.
|
|
|
|
|
|
(dir-stream-info dir-stream) -> fs-object
|
|
|
|
Returns the fs-object corresponding to the directory.
|
|
|
|
|
|
(fs-object? thing) -> boolean
|
|
|
|
Type predicate for file-objects.
|
|
|
|
|
|
(fs-object-parent fs-object) -> string
|
|
|
|
The parent directory of the fs-object.
|
|
|
|
|
|
|
|
(fs-object-name fs-object) -> string
|
|
|
|
The file name of the fs-object.
|
|
|
|
|
|
|
|
(fs-object-info fs-object) -> file-info
|
|
|
|
The file-info record of the fs-object.
|
|
|
|
|
|
|
|
(fs-object-file-name fs-object) -> string
|
|
|
|
The path to the fs-object.
|
|
|
|
|
|
|
|
(dir-stream-files-stream dir-steam) -> fs-object stream
|
|
|
|
A stream of the fs-objects of the files within the directory.
|
|
|
|
|
|
|
|
(dir-stream-subdir-stream dir-stream) -> dir-stream stream
|
|
|
|
A stream of dir-streams of the subdirectories within the directory.
|
|
|
|
|
|
(dir-stream-filter dir-stream file-pred dir-pred) -> dir-stream
|
|
|
|
Applies the predicate DIR-PRED to all the subdirectories and FILE-PRED
|
|
to all the files within directory. The returned stream contains only
|
|
the files and subdirectories for which the predicates return #t.
|
|
|
|
|
|
(dir-stream-fold-right ds make-dir-stream
|
|
files-make-stream files-stream-empty
|
|
subdirs-make-stream subdirs-empty) -> return type of make-dir-stream
|
|
|
|
Replaces the constructors of the dir-stream by the supplied procedures.
|
|
Example:
|
|
(define (disc-usage ds)
|
|
(dir-stream-fold-right ds (lambda (fso sum subdirs) (list (fs-object-filename fso)
|
|
(apply + sum (map cadr subdirs))
|
|
subdirs))
|
|
(lambda (fso accu)
|
|
(+ accu (file-info:size (fs-object-info fso))))
|
|
0
|
|
cons
|
|
'()))
|
|
|
|
|
|
(dir-stream-map dir-stream-map-f dir-stream file-f dir-f)
|
|
|
|
TODO argument order
|
|
|
|
(dir-stream-filter-map dir-stream-map-f dir-stream file-f dir-f)
|
|
|
|
|
|
(dir-stream-for-each dir-stream file-f dir-f)
|
|
|