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Date: Mon, 3 Feb 2014 18:36:00 +0100
From: Roman Neuhauser <neuhauser@sigpipe.cz>
To: zsh-users@zsh.org
Subject: destructuring assignment
Message-ID: <20140203173600.GG14992@isis.sigpipe.cz>
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User-Agent: Mutt/1.5.21 (2010-09-15)

hello,

having an array such as

  declare -a partitions; partitions=(
    /boot:boot:512:fat:boot,legacy_boot
    :swap:10240:swap
    /:root:-:btrfs
  )

i'd love to iterate it like:

  for mountp name size fs flags in ...; do
    # 1st iteration
    # $mountp=/boot $name=boot $size=512 fs=fat flags=boot,legacy_boot
    # 2nd iteration
    # $mountp= $name=swap $size=10240 fs=swap flags=
    # 3rd iteration
    # $mountp=/ $name=root $size=- fs=btrfs flags=
  done

i tried for ... in "${(@s.:.)partitions}", but that seems to join the
array before applying the (s.:.), which is contrary to my expectations,
but i may be misreading the manual (14.3.1: "[(@)] is distinct from
*field splitting* by the `f`, `s` or `z` flags, which still applies
within each array element.")

this is what i see:

  roman@stick ~ 1026:0 > echo $ZSH_VERSION
  5.0.2
  roman@stick ~ 1027:0 > typeset -p foos
  typeset -a foos
  foos=(a1:a2:a3a,a3b,a3c b1:b2:b3 :c2:c3)
  roman@stick ~ 1028:0 > for a b c in "${(@s.:.)foos}"; do typeset -p a b c; done
  typeset a=a1
  typeset b=a2
  typeset c='a3a,a3b,a3c b1'
  typeset a=b2
  typeset b='b3 '
  typeset c=c2
  typeset a=c3
  typeset b=''
  typeset c=''

and this is what i want:

  roman@stick ~ 1028:0 > for a b c in "${(???)foos}"; do typeset -p a b c; done
  typeset a=a1
  typeset b=a2
  typeset c=a3a,a3b,a3c
  typeset a=b1
  typeset b=b2
  typeset c=b3
  typeset a=''
  typeset b=c2
  typeset c=c3

-- 
roman