#!/bin/sh
set -eu

if command -v diceware >/dev/null; then
  PW_GENERATOR='diceware -s2'

elif command -v pwgen >/dev/null; then
  PW_GENERATOR='pwgen -y 20 1'

else
  PW_GENERATOR='dd if=/dev/random bs=256 count=1 | base64'

fi

exec vim -c 'set noshelltemp' -c "0read! $PW_GENERATOR" -c 2d -n