On Thu, May 05, 2011 at 05:40:02AM -0700, Steffen wrote:
> Hello,
>
> I'm trying to come up with a way to recreate a directory hierarchy. Entries
> within zip archives are just flat strings like "top/level/file1", but I would
> like to operate on them hierarchically. So my problem could be stated as:
> If
>
> (restore-hierarchy [["top" "level" "file1"] ["top" "level" "file2"] ["top"
> "level2" "file3"]])
>
> returns
>
> {"top" {"level" ("file1" "file2"), "level2" ("file3")}}
>
> what does a nice definition of #'restore-hierarchy look like? Sadly my own
> attempts to hack it are too embarrassing to post them here...
Here's my version using `clojure.contrib.map-utils/deep-merge-with`:
(use '[clojure.contrib.map-utils
:only [deep-merge-with]])
(defn file-path [[first & rest]]
(if rest
{first (file-path rest)}
first))
(defn restore-hierarchy [x]
(->> x
(map file-path)
(apply deep-merge-with list)))
Syntax highlighted: https://gist.github.com/957202
--
Timo
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