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Computing the Size of a Directory

Problem

You want to compute the total size of a directory tree (i.e. the sum of the file sizes in a directory tree).

Solution 

(require (lib "file.ss"))
(fold-files (lambda (f type a) 
              (if (eq? type 'file) 
                  (+ a (file-size f)) 
                  a))
            0 
            path)

Discussion

fold-files in PLT's file.ss pretty much has this built in. All you need to add is a procedure to accumulate the size of the files.

For a little twist, here's a version that collects the total file size in the car of a pair and the number of files in the cdr: 

(fold-files (lambda (f type a) 
              (let ((size (car a))
                    (cnt (cdr a)))
                (if (eq? type 'file)
                    (begin
                      (set-car! a (+ size (file-size f)))
                      (set-cdr! a (+ cnt 1))
                      a)
                    a)))
            (cons 0 0)
            path)

Comments about this recipe

Contributors

-- GordonWeakliem - 13 Aug 2004

CookbookForm
TopicType: Recipe
ParentTopic: FileRecipes
TopicOrder: 999

 
 
Current Rev: r1.2 - 19 Aug 2004 - 01:56 GMT - GordonWeakliem, Revision History:Diffs | r1.2 | > | r1.1
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