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Date: Mon, 29 Jun 2015 15:59:27 +0100
From: Peter Stephenson <p.stephenson@samsung.com>
To: Zsh Users' List <zsh-users@zsh.org>
Subject: Tip of the day: prune empty directory hierarchies
Message-id: <20150629155927.289729cb@pwslap01u.europe.root.pri>
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In case anybody ever wanted this and there isn't a standard solution I
don't know about...

pws


# Prune empty directory hierarchies below the current directory.  That's
# a hierarchy where everything underneath is itself a directory.
#
# The first search is slow, but subsequently it simply goes up one
# directory each time so it's much faster.

local -aU dirs

dirs=(**/*(ND/^F))
while (( ${#dirs} )); do
  rmdir $dirs || return
  # print Pruhed ${#dirs} directories...
  dirs=(${^dirs:h}(ND/^F))
done