#!/bin/bash

# reads lines from stdin and displays the most recent
# line in the terminal's first row and last columns.
#
# example usage:
# while true; do date; sleep 1; done | ./top_right_indicator

IFS=''
AWIDTH=0
while read -r DISPLAY_STRING; do
  PWIDTH=$AWIDTH
  AWIDTH=${#DISPLAY_STRING}
  WIDTH=$(( PWIDTH > AWIDTH ? PWIDTH : AWIDTH ))
  TARGET_COLUMN=$(($(tput cols)-$WIDTH))
  tput sc
  tput cup 0 $TARGET_COLUMN
  printf '%'"$WIDTH"'s' "$DISPLAY_STRING"
  tput rc
done