diff options
| -rw-r--r-- | lisplib.c | 1 | ||||
| -rw-r--r-- | share/txr/stdlib/path-test.tl | 9 | ||||
| -rw-r--r-- | txr.1 | 28 |
3 files changed, 38 insertions, 0 deletions
@@ -190,6 +190,7 @@ static val path_test_set_entries(val dlt, val fun) lit("path-newer"), lit("path-older"), lit("path-same-object"), lit("path-private-to-me-p"), lit("path-strictly-private-to-me-p"), + lit("path-dir-empty"), nil }; diff --git a/share/txr/stdlib/path-test.tl b/share/txr/stdlib/path-test.tl index ee211ff2..4ebb1e3e 100644 --- a/share/txr/stdlib/path-test.tl +++ b/share/txr/stdlib/path-test.tl @@ -174,3 +174,12 @@ (and s0 s1 (eql s0.dev s1.dev) (eql s0.ino s1.ino))))) + +(defun path-dir-empty (path) + (when (path-dir-p path) + (let ((name (if (stringp path) path path.path))) + (with-stream (ds (open-directory name)) + (for (ent) ((set ent (get-line ds)) t) () + (casequal ent + (("." "..")) + (t (return nil)))))))) @@ -58016,6 +58016,34 @@ for a socket and .code path-pipe-p for a named pipe. +.coNP Function @ path-dir-empty +.synb +.mets (path-dir-empty << path ) +.syne +.desc +The +.code path-dir-empty +function returns +.code t +if +.meta path +is an empty directory. + +Implementation note: this function performs a test similar to +.codn path-dir-p ; +then, if it is confirmed that +.meta path +is a directory, a directory stream is opened and entries are read. +If an entry is seen which has a name other than +.str . +or +.str .. +then it is concluded that the directory is not empty and +.code nil +is returned. If no such entry is seen, then the directory is deemed empty and +.code t +is returned. + .coNP Functions @, path-setgid-p @ path-setuid-p and @ path-sticky-p .synb .mets (path-setgid-p << path ) |