#!/bin/sh
# generates a password of length $1, sends it to stdout if $2 is blank.
# if $2 is clip, sends it to the X clipboard and clears it after 10 seconds.
# if $2 is anything else, sends it to the X primary selection and clears it after 10 seconds
if [ "$1" = "-h" ]; then
  printf 'usage: %s [-h]|LENGTH [clip|pri]\n' "$(basename $0)">/dev/stderr
  return 1
fi
PW=$(tr -cd "[:alnum:][:punct:]"</dev/urandom|fold -w "$1"|head -1)
if [ -n "$2" ]; then
    # streamline selection variation by using $SEL
    if [ "$2" = "clip" ]; then
	    SEL="-sel clip"
    else
	    SEL=""
    fi
    # backgrounds so the user doesn't have to wait 10 seconds to get a prompt again
      {
      printf "%s" "$PW"|xclip $SEL -i&&notify-send "Password Generated" "$1-character password generated. It will clear in 10 seconds."
      sleep 10
      printf '\0'|xclip $SEL -i&&notify-send "Clipboard Cleared" "Generated password cleared from clipboard."
      } &
else
  printf '%s\n' "$PW"
fi