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#compdef lsblk

local sep ret=1
local -a values dedup suf=( -qS , )
local curcontext="$curcontext" state line expl
typeset -A opt_args

_arguments -C -s -S \
  '(H -a --all)'{-a,--all}'[print all devices]' \
  '(H -b --bytes)'{-b,--bytes}'[print size in bytes rather than in human readable format]' \
  '(H -d --nodeps)'{-d,--nodeps}"[don't print slaves or holders]" \
  '(H -I --include)*'{-e,--exclude}'[exclude devices by major number]:major device number:->majorlist' \
  '(H -e --exclude)*'{-I+,--include=}'[show only devices with specified major numbers]:major device number:->majorlist' \
  '(H -n --noheadings)'{-n,--noheadings}"[don't print headings]" \
  '(H -p --paths)'{-p,--paths}'[print complete device path]' \
  '(H -s --inverse)'{-s,--inverse}'[reverse dependency order]' \
  '(H -x --sort)'{-x+,--sort=}'[sort output by specified column]:column:->columns' \
  '*:device:_files -g "*(-%b)" -P / -W /' \
  + fields \
  '(H -D --discard -o --output -O --output-all)'{-D,--discard}'[output discard capabilities]' \
  '(H -f --fs -o --output -O --output-all)'{-f,--fs}'[output info about filesystems]' \
  '(H -m --perms -o --output -O --output-all)'{-m,--perms}'[output info about permissions]' \
  '(H -S --scsi -o --output -O --output-all)'{-S,--scsi}'[output info about SCSI devices]' \
  '(H -t --topology -o --output -O --output-all)'{-t,--topology}'[output info about topology]' \
  '(H fields)'{-o+,--output=}'[specify output columns]:output column:->columnlist' \
  '(H fields)'{-O,--output-all}'[output all columns]' \
  + '(format)' \
  '(H)'{-i,--ascii}'[output ascii characters only]' \
  '(H)'{-J,--json}'[use JSON output format]' \
  '(H)'{-l,--list}'[use list format output]' \
  '(H)'{-P,--pairs}'[use key="value" output format]' \
  '(H)'{-r,--raw}'[use raw output format]' \
  + 'H' \
  '(* -)'{-h,--help}'[display help information]' \
  '(* -)'{-V,--version}'[display version information]' && ret=0

case $state in
  *list)
    dedup=( ${(Ms.,.)PREFIX##*,} ${(Ms.,.)SUFFIX%%,*} )
    compset -S ',*' && suf=()
    compset -P '*,'
  ;|
  column*)
    values=(
      ${${${${(f)"$(_call_program columns lsblk -h)"}[(r)Available*,-3]## #}[2,-1]//:/\\:}/  /:}
    )
    _describe -t fields column values -M 'm:{a-z}={A-Z}' $suf -F dedup && ret=0
  ;;
  major*)
    zstyle -s ":completion:${curcontext}:" list-separator sep || sep=--
    values=( ${${${(f)"$(</proc/devices)"}[(r)Block*,-1]## #}[2,-1]/ /:} )
    zformat -a values " $sep " $values
    _wanted -V devices expl 'major device number' compadd $suf -d values -F dedup ${values%% *} && ret=0
  ;;
esac

return ret