klokke

   1 #!/usr/bin/env perl
   2
   3 #=======================================================================
   4 # klokke
   5 # File ID: 37c2594c-f743-11dd-b452-000475e441b9
   6 #
   7 # Continuously print date and timestamp, mostly used to check the sync
   8 # between computers.
   9 #
  10 # Character set: UTF-8
  11 # ©opyleft 2006– Øyvind A. Holm <sunny@sunbase.org>
  12 # License: GNU General Public License version 2 or later, see end of
  13 # file for legal stuff.
  14 #=======================================================================
  15
  16 use strict;
  17 use warnings;
  18 use Getopt::Long;
  19 use Time::HiRes qw{ gettimeofday usleep };
  20
  21 local $| = 1;
  22
  23 our %Opt = (
  24
  25     'epoch' => 0,
  26     'help' => 0,
  27     'quiet' => 0,
  28     'verbose' => 0,
  29     'version' => 0,
  30
  31 );
  32
  33 our $progname = $0;
  34 $progname =~ s/^.*\/(.*?)$/$1/;
  35 our $VERSION = '0.2.1';
  36
  37 Getopt::Long::Configure('bundling');
  38 GetOptions(
  39
  40     'epoch|e' => \$Opt{'epoch'},
  41     'help|h' => \$Opt{'help'},
  42     'quiet|q+' => \$Opt{'quiet'},
  43     'verbose|v+' => \$Opt{'verbose'},
  44     'version' => \$Opt{'version'},
  45
  46 ) || die("$progname: Option error. Use -h for help.\n");
  47
  48 $Opt{'verbose'} -= $Opt{'quiet'};
  49 $Opt{'help'} && usage(0);
  50 if ($Opt{'version'}) {
  51     print_version();
  52     exit(0);
  53 }
  54
  55 exit(main());
  56
  57 sub main {
  58     # {{{
  59     my $Retval = 0;
  60
  61     my ($Old, $Str) = ("", "");
  62     my $time_str = $Opt{'epoch'} ? "%s" : "%04u-%02u-%02u %02u:%02u:%02uZ";
  63
  64     while (1) {
  65         do {
  66             usleep(10);
  67             my ($Epoch, $Fract) = gettimeofday();
  68             my ($Sec, $Min, $Hour, $Day, $Mon, $Year, $Wday, $Yday, $is_dst) =
  69                 gmtime($Epoch);
  70             $Str = sprintf($time_str,
  71                 $Opt{'epoch'} ? $Epoch
  72                               : ($Year+1900, $Mon+1, $Day, $Hour, $Min, $Sec));
  73         } while ($Str eq $Old);
  74         print("$Str\r");
  75         $Old = $Str;
  76         usleep(900_000);
  77     }
  78
  79     return $Retval;
  80     # }}}
  81 } # main()
  82
  83 sub print_version {
  84     # Print program version {{{
  85     print("$progname $VERSION\n");
  86     return;
  87     # }}}
  88 } # print_version()
  89
  90 sub usage {
  91     # Send the help message to stdout {{{
  92     my $Retval = shift;
  93
  94     if ($Opt{'verbose'}) {
  95         print("\n");
  96         print_version();
  97     }
  98     print(<<"END");
  99
 100 Continuously print date and timestamp, mostly used to check the sync
 101 between computers.
 102
 103 Usage: $progname [options]
 104
 105 Options:
 106
 107   -e, --epoch
 108     Display Unix time (seconds since 1970-01-01 00:00:00 UTC) instead of
 109     the default ISO 8601 format.
 110   -h, --help
 111     Show this help.
 112   -q, --quiet
 113     Be more quiet. Can be repeated to increase silence.
 114   -v, --verbose
 115     Increase level of verbosity. Can be repeated.
 116   --version
 117     Print version information.
 118
 119 END
 120     exit($Retval);
 121     # }}}
 122 } # usage()
 123
 124 sub msg {
 125     # Print a status message to stderr based on verbosity level {{{
 126     my ($verbose_level, $Txt) = @_;
 127
 128     if ($Opt{'verbose'} >= $verbose_level) {
 129         print(STDERR "$progname: $Txt\n");
 130     }
 131     return;
 132     # }}}
 133 } # msg()
 134
 135 __END__
 136
 137 # This program is free software; you can redistribute it and/or modify
 138 # it under the terms of the GNU General Public License as published by
 139 # the Free Software Foundation; either version 2 of the License, or (at
 140 # your option) any later version.
 141 #
 142 # This program is distributed in the hope that it will be useful, but
 143 # WITHOUT ANY WARRANTY; without even the implied warranty of
 144 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 145 # See the GNU General Public License for more details.
 146 #
 147 # You should have received a copy of the GNU General Public License
 148 # along with this program.
 149 # If not, see L<http://www.gnu.org/licenses/>.
 150
 151 # vim: set fenc=UTF-8 ft=perl fdm=marker ts=4 sw=4 sts=4 et fo+=w :