elegant-clock.sh

#!/bin/bash
#
# Elegant digital clock

usage ()
{
 echo "Usage: $0 [-h|--help] [-w|--what]"; echo
 echo "Launches an elegant digital xclock.

-w shows what font is the best, and what is used as default font."
 exit 0
}

dig_clock ()
{
 local FNT="$*"
 local SIZE=28
 local FACE="${FNT}-${SIZE}"

 # Check for the font
 if ! fc-list | grep -qi "$FNT"; then
	echo "Warning: '$FNT' not found in fontconfig."
	echo
	fc-list | grep Mono:
 fi

 xclock \
  -digital \
  -strftime "%a %H:%M:%S" \
  -face "$FACE" \
  -update 1 \
  -padding 20 \
  -geometry 320x80 &
}

best_font ()
{
 local candidates=(
	"Bitstream Vera Sans Mono"
	"DejaVu Sans Mono"
	"Liberation Mono"
	"Noto Sans Mono"
	"JetBrains Mono"
	"Fira Mono"
	"Monospace"
 )
 for font in "${candidates[@]}"; do
     if fc-list | grep -qi "$font"; then
	 echo "$font"
	 return 0
     fi
 done
 # Fallback
 echo "Monospace"
 return 0
}


#
# Main script
#

FNT="Bitstream Vera Sans Mono"

case $1 in
	-h|--help) usage;;
	-w|--what)
		echo "Default font is: $FNT"
		echo
		[ "$(best_font)" == "$FNT" ] && echo -n "(Matches) "
		echo "Best font: $(best_font)"
		exit 0
		;;
	[A-Z]*) echo "$@:::"; dig_clock "$@"; exit 0;;
esac

dig_clock "$FNT"