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(ql:quickload '(:fiveam :cl-ppcre))
(defun parse-to-tree (stream)
(labels ((scan ()
(loop for item = (read-line stream nil nil)
while (and item (not (equal "$ cd .." item)))
when (parse item) collect it))
(parse (item)
(cond
((ppcre:register-groups-bind (dir) ("\\$ cd (\\w+|/)" item) (cons dir (scan))))
((ppcre:register-groups-bind ((#'parse-integer size) name) ("^(\\d+) ([.\\w]+)" item)
(cons name size))))))
(car (scan))))
(defun aggregate-size (tree)
(let (dir-list)
(labels ((combiner (tri)
(push (cons (car tri) (adder tri)) dir-list)
(mapc (lambda (item)
(unless (numberp (cdr item)) ;; skips files
(combiner item)))
(cdr tri)))
(adder (tri)
(reduce (lambda (acc item)
(+ acc (if (numberp (cdr item))
(cdr item)
(adder item))))
(cdr tri) :initial-value 0)))
(combiner tree))
dir-list))
(defun flat-dir-size (filename)
(with-open-file (in filename)
(aggregate-size
(parse-to-tree in))))
(defun addr-small-dirs (dir-sizes small-limit)
(loop for (_name . size) in dir-sizes
when (< size small-limit)
sum size))
(defun dir-to-del (dir-sizes total-disk needed-disk)
(let* ((free-disk (- total-disk (cdar (last dir-sizes))))
(to-free (- needed-disk free-disk)))
(loop for (_name . size) in dir-sizes
when (> size to-free)
minimizing size)))
(fiveam:test results
(fiveam:is (= 95437 (addr-small-dirs (flat-dir-size "eg-in") 100000)))
(fiveam:is (= 1845346
(addr-small-dirs (flat-dir-size "input") 100000)))
(fiveam:is (= 3636703
(dir-to-del (flat-dir-size "input") 70000000 30000000))))
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