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#compdef pidof

local curcontext="$curcontext" state line expl ret=1
typeset -A opt_args

local exargs="-h --help -V --version"
_arguments -C -s -w \
  '(- *)'{-h,--help}'[display help information]' \
  '(- *)'{-V,--version}'[print program version]' \
  "(-s --single-shot $exargs)"{-s,--single-shot}'[return one PID only]' \
  "(-c --check-root $exargs)"{-c,--check-root}'[omit processes with different root]' \
  "(-x $exargs)"-x'[include shells running named scripts]' \
  "($exargs)"\*{-o+,--omit-pid}'[omit processes with PIDs]:pids:_sequence -s , _pids' \
  '*:process:->procnames' \
  && return 0

case $state in
  procnames)
    # Handle defunct processes and "avahi-daemon:"
    _wanted process-names expl process compadd ${${${${${(@)${(f)"$(ps -N --ppid 2 -p 2 o args=)"}%% *}##*/}%:}#\[}%]} && ret=0
  ;;
esac

return ret