遍历目录树，清理编译目录

下面的代码将当前目录下所有子目录里面的dll, pdb, obj和lib文件全部删除。

文件名clean.lsp

;; remove *.lib, *.dll, *.pdb and *.obj in current folder
;; then handle sub folders
(define (clean-folder dir-path)
  (println "enter " dir-path)
  (let (fs (directory dir-path "\.dll|\.pdb|\.obj|\.lib"))
    (dolist (af fs)
	    (begin
	      (println (append "remove file: " af))
	      (delete-file (append dir-path "\" af))
	      )
	    ))
  (let (files (directory dir-path {^[a-z]}))
    (begin
      (dolist (f files)
	      (let (cf (append dir-path "\" f))
		(if (directory? cf)
		    (clean-folder cf))))
      )))

(clean-folder (real-path) )

(exit)

主要当心函数directory返回的虽然是当前目录的子文件，但是只有文件名，路径还要自己拼接。我就在这个地方没有注意，卡了一小时。