ensure-directories aka create-directories Lassi Kortela 31 Jul 2020 10:46 UTC

SRFI 170 is missing one of the most useful (and commonly missing, and
tricky/error-prone to manually implement) OS procedures:

(ensure-directory "foo")

* Create directory "foo" while also creating any missing parent directories.

* If "foo" already exists and is a directory, silently succeed.

* If "foo" (or one of its parents) already exists but is not a
directory, raise an exception.

* On file system error, raise an exception as usual.