newLISP实现删除目录这是个很简单的需求，可是API只提供了一个几乎没什么用的函数，remove-dir 要求目录必须为空， 99%的情况是目录不为空。
因此我写了一个函数来递归删除目录树：
(define (make-sure-folder-path-end-of-slash dir-path)
(if (!= (last dir-path) "/")
(push "/" dir-path -1)
)
dir-path
)
(define (no-sub-files dir-path)
(not (directory dir-path {[^(\.$)]})))
(define (delete-dir dir-path)
;; check dir-path
(unless (directory dir-path)
(throw-error (string dir-path " folder does not exist")))
;; append slash to dir-path
(set 'dir-path (make-sure-folder-path-end-of-slash dir-path))
;; process sub files
(let (sub-files (directory dir-path {[^(\.$)]}))
(if sub-files
(begin
;; iterate all sub files
(dolist (nde sub-files)
(if (directory (append dir-path nde))
(delete-dir (append dir-path nde) file-op ext-context)
(let (file-path (append dir-path nde))
(println (string "delete file " file-path ": " (file-info file-path)))
(delete-file file-path ext-context))))
(if (no-sub-files dir-path)
(begin
(println (string "delete folder " dir-path ": " (file-info dir-path)))
(remove-dir dir-path))
)
)
(begin
(println "no sub files in " dir-path " folder, delete this folder")
(remove-dir dir-path))
)
)
)
测试方法：
dean@dean-Latitude-3330:~/Downloads$ mkdir -p x/x2/x3; touch x/x2/x3/z;touch x/x2/m;touch x/.sss; touch x/a.x;
dean@dean-Latitude-3330:~/Downloads$ tree x -a
x
├── a.x
├── .sss
└── x2
├── m
└── x3
└── z
2 directories, 4 files
然后执行newlisp函数：
> (delete-dir "/home/dean/Downloads/x")
delete file /home/dean/Downloads/x/a.x: (0 33204 0 1000 1000 1409987071 1409987071 1409987071)
delete file /home/dean/Downloads/x/x2/x3/z: (0 33204 0 1000 1000 1409987071 1409987071 1409987071)
delete folder /home/dean/Downloads/x/x2/x3/: (4096 16893 0 1000 1000 1409987075 1409987075 1409987075)
delete file /home/dean/Downloads/x/x2/m: (0 33204 0 1000 1000 1409987071 1409987071 1409987071)
delete folder /home/dean/Downloads/x/x2/: (4096 16893 0 1000 1000 1409987075 1409987075 1409987075)
delete file /home/dean/Downloads/x/.sss: (0 33204 0 1000 1000 1409987071 1409987071 1409987071)
delete folder /home/dean/Downloads/x/: (4096 16893 0 1000 1000 1409987075 1409987075 1409987075)
true