progress

# Quick and dirty progress bar for the Onion OLED display
#
# This allows you to visually display a progress bar on the bottom line
# of the Onion OLED display.  It's not the most efficient way to do this
# but works well enough.
#
# It expects a floating point number representing the progress, between 0 and 1.
#
# NB: 'oled-exp -i' should be called *before* using this script.
#
# Example:
#   progress .5
#  will show
#   [==========         ]
#  on the bottom line of the OLED display.
#
# BUGS
#    No boundary or type checking is performed, so passing in no input,
#    numbers less than 0 or greater than 1, strings, etc. is not handled.

if [ $1 == 0 ]
then
    str="                   "
else
    num=$(echo $1 | awk '{ printf("%.0f", $1 * 19); }' -)
    str=$(printf "%-${num}s" "=" | tr ' ' '=')$(printf "%-$(expr 19 - $num)s" " ")
fi
oled-exp cursor 7,0 write "["
oled-exp cursor 7,1 write "$str"
oled-exp cursor 7,20 write "]"