jday

   1 #!/bin/sh
   2
   3 #==============================================================================
   4 # jday
   5 # File ID: 60e80cc2-a9d9-11e5-986a-fefdb24f8e10
   6 #
   7 # Display current time or another date as Julian Day
   8 #
   9 # Author: Øyvind A. Holm <sunny@sunbase.org>
  10 # License: GNU General Public License version 2 or later.
  11 #==============================================================================
  12
  13 progname=jday
  14 VERSION=0.2.0
  15
  16 opt_help=0
  17 opt_quiet=0
  18 opt_verbose=0
  19 while test -n "$1"; do
  20         case "$1" in
  21         -h|--help) opt_help=1; shift ;;
  22         -q|--quiet) opt_quiet=$(($opt_quiet + 1)); shift ;;
  23         -v|--verbose) opt_verbose=$(($opt_verbose + 1)); shift ;;
  24         --version) echo $progname $VERSION; exit 0 ;;
  25         --) shift; break ;;
  26         *)
  27                 if printf '%s\n' "$1" | grep -q ^-; then
  28                         echo "$progname: $1: Unknown option" >&2
  29                         exit 1
  30                 else
  31                         break
  32                 fi
  33         break ;;
  34         esac
  35 done
  36 opt_verbose=$(($opt_verbose - $opt_quiet))
  37
  38 if test "$opt_help" = "1"; then
  39         test $opt_verbose -gt 0 && { echo; echo $progname $VERSION; }
  40         cat <<END
  41
  42 Without command line arguments, display current time as Julian Day.
  43 Command line arguments are parsed as a ISO date to be displayed as
  44 Julian Day.
  45
  46 Usage: $progname [options] [DATE]
  47
  48 Options:
  49
  50   -h, --help
  51     Show this help.
  52   -q, --quiet
  53     Be more quiet. Can be repeated to increase silence.
  54   -v, --verbose
  55     Increase level of verbosity. Can be repeated.
  56   --version
  57     Print version information.
  58
  59 END
  60         exit 0
  61 fi
  62
  63 test -z "$1" && julianday=now || julianday="$*"
  64 echo "SELECT julianday('$julianday');" | sqlite3
  65
  66 # vim: set ts=8 sw=8 sts=8 noet fo+=w tw=79 fenc=UTF-8 :