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#!/bin/bash -e
#---------------------------------------------------------------------
# Script to display a "binary clock" using unicode characters from the
# braille block.
#
# Designed to work with the wonderful byobu(1) but can be run
# stand-alone.
#---------------------------------------------------------------------
#
# Copyright (C) 2011 Canonical Ltd.
#
# Author: James Hunt <[email protected]>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
#---------------------------------------------------------------------

script_name=${0##*/}

# Selected Unicode Braille characters:
#
#  0x2800, 0x2880, 0x2820, 0x28a0, 0x2810, 0x2890, 0x2830, 0x28b0, 0x2808, 0x2888,
#  0x2840, 0x28c0, 0x2860, 0x28e0, 0x2850, 0x28d0, 0x2870, 0x28f0, 0x2848, 0x28c8,
#  0x2804, 0x2884, 0x2824, 0x28a4, 0x2814, 0x2894, 0x2834, 0x28b4, 0x280c, 0x288c,
#  0x2844, 0x28c4, 0x2864, 0x28e4, 0x2854, 0x28d4, 0x287b, 0x28f4, 0x284c, 0x28cc,
#  0x2802, 0x2882, 0x2822, 0x28a2, 0x2812, 0x2892, 0x2832, 0x28b2, 0x280a, 0x288a,
#  0x2842, 0x28c2, 0x2862, 0x28e2, 0x2852, 0x28d2, 0x2872, 0x28f2, 0x284a, 0x28ca,
#  0x2806, 0x2886
#
# Index of this array is 0-61 with character returned being
# "two column" binary representation of a time segment.
#
binary=(⠀ ⢀ ⠠ ⢠ ⠐ ⢐ ⠰ ⢰ ⠈ ⢈ \
         ⡀ ⣀ ⡠ ⣠ ⡐ ⣐ ⡰ ⣰ ⡈ ⣈ \
         ⠄ ⢄ ⠤ ⢤ ⠔ ⢔ ⠴ ⢴ ⠌ ⢌ \
         ⡄ ⣄ ⡤ ⣤ ⡔ ⣔ ⡻ ⣴ ⡌ ⣌ \
         ⠂ ⢂ ⠢ ⢢ ⠒ ⢒ ⠲ ⢲ ⠊ ⢊ \
         ⡂ ⣂ ⡢ ⣢ ⡒ ⣒ ⡲ ⣲ ⡊ ⣊ ⠆ ⢆)

usage()
{
cat <<EOT
Description: A clock that displays the time in binary.

Usage: $script_name [options]


Options:

 -b         : Display binary clock (default)
 -h         : Show this help.
 -l         : Display leading zeros (hex and octal modes only).
 -m         : Show time in 24-hour military format
              (default: 12-hour format).
 -n         : Suppress newline at end of time.
 -o         : Display time in octal (base 8).
 -s <sep>   : Specify separator between hours and minutes
              (and seconds if not disabled).
 -u         : Display alphabetics in upper-case (hex mode only).
 -x         : Disable time in hexadecimal (base 16).
 -z         : Disable display of seconds.

EOT
}

suppress_seconds=n
clock_type=binary
format=std
ending=""
uppercase=n
leading_zeros=n

while getopts "bhlmnos:uxz" opt
do
  case "$opt" in
    b) 
      clock_type=binary
    ;;

    h) 
      usage
      exit 0
    ;;

    l) 
      leading_zeros=y
    ;;

    m) 
      format=mil
    ;;

    n) 
      ending=
    ;;

    o) 
      clock_type=oct
    ;;

    s) 
      sep=$OPTARG
    ;;

    u)
      uppercase=y
    ;;

    x) 
      clock_type=hex
    ;;

    z) 
      suppress_seconds=y
    ;;
  esac
done

if [ -z "$clock_type" ]
then
  printf "%s\n" "ERROR: must specify clock type"
  exit 1
fi

shift $[$OPTIND-1]

# get current time, handling 12-hour or 24-hour
if [ $format = std ]
then
  hrs_format=%l
else
  hrs_format=%k
fi

time=($(date "+${hrs_format} %M %S"))
h=$(printf ${time[0]})
m=$(printf ${time[1]})
s=$(printf ${time[2]})

if [ $clock_type = binary ]
then
  [ $suppress_seconds = n ] && seconds="${sep}${binary[10#$s]}"
  display_time="${binary[10#$h]}${sep}${binary[10#$m]}${seconds}${ending}"
else
  if [ $clock_type = hex ]
  then
    conversion=x
    [ $uppercase = y ] && conversion=X
  else
    conversion=o
  fi
  precision=
  [ $leading_zeros = y ] && precision=.2
  base_format=%2${precision}${conversion}

  hh=$(printf "$base_format" $h)
  hm=$(printf "$base_format" $m)
  [ "$suppress_seconds" = n ] && hs="${sep}$(printf "$base_format" $s)"
  display_time="${hh}${sep}${hm}${hs}${ending}"
fi

color k w
printf "%s" "$display_time"
color --