#!/usr/bin/env zsh

eval "$_z4h_opt"

local -a timeout pattern
zparseopts -D -F --                   \
  {t,-timeout-seconds}:=timeout       \
  {p,-lines-columns-pattern}:=pattern \
  || return '_z4h_err()'

if (( $#pattern == 2 )); then
  pattern=$pattern[2]
else
  return '_z4h_err()'
fi

if (( $#timeout == 2 )); then
  [[ $timeout[2] == <->(|.<->) ]] || return '_z4h_err()'
  typeset -F timeout=$timeout[2]
else
  return '_z4h_err()'
fi

[[ $TERM == (screen|tmux)* ]] && return 0
[[ -v commands[true]       ]] || return 0

local -F deadline='EPOCHREALTIME + timeout'
while [[ "$LINES $COLUMNS" != $~pattern ]] && (( EPOCHREALTIME < deadline )); do
  command true
done

return 0