#compdef pflags pcred pmap pldd psig pstack pfiles pwdx pstop prun pwait

# If given the `-m <pattern>' option, this tries to complete only pids
# of processes whose command line match the `<pattern>'.

local out pids list expl match desc listargs all nm ret=1

_tags processes || return 1

if [[ "$1" = -m ]]; then
  all=()
  match="(*[[:blank:]]|)${PREFIX}[0-9]#${SUFFIX}[[:blank:]]*(/|[[:blank:]]-(#c,1))${2}([[:blank:]]*|)"
  shift 2
elif [[ "$PREFIX$SUFFIX" = ([%-]*|[0-9]#) ]]; then
  all=()
  match="(*[[:blank:]]|)${PREFIX}[0-9]#${SUFFIX}[[:blank:]]*"
else
  all=(-P "$IPREFIX" -S "$ISUFFIX" -U)
  match="*[[:blank:]]*[[/[:blank:]]$PREFIX*$SUFFIX*"
  nm="$compstate[nmatches]"
fi

while _tags; do
  if _requested processes; then
    while _next_label processes expl 'process ID'; do
      out=( "${(@f)$(_call_program $curtag ps 2>/dev/null)}" )
      desc="$out[1]"
      out=( "${(@M)out[2,-1]:#${~match}}" )

      if [[ "$desc" = (#i)(|*[[:blank:]])pid(|[[:blank:]]*) ]]; then
	pids=( "${(@)${(@M)out#${(l.${#desc[1,(r)(#i)[[:blank:]]pid]}..?.)~:-}[^[:blank:]]#}##*[[:blank:]]}" )
      else
	pids=( "${(@)${(@M)out##[^0-9]#[0-9]#}##*[[:blank:]]}" )
      fi

      if zstyle -T ":completion:${curcontext}:$curtag" verbose; then
	list=( "${(@Mr:COLUMNS-1:)out}" )
	desc=(-ld list)
      else
	desc=()
      fi
      compadd "$@" "$expl[@]" "$desc[@]" "$all[@]" -a pids && ret=0
    done
  fi
  (( ret )) || break
done

if [[ -n "$all" ]]; then
  zstyle -s ":completion:${curcontext}:processes" insert-ids out || out=menu

  case "$out" in
  menu)   compstate[insert]=menu ;;
  single) [[ $compstate[nmatches] -ne nm+1 && $compstate[insert] != menu ]] &&
              compstate[insert]= ;;
  *)      [[ ${#:-$PREFIX$SUFFIX} -gt ${#compstate[unambiguous]} ]] &&
              compstate[insert]=menu ;;
  esac
fi

return ret