#!/usr/bin/perl
#
# find files that were last modified 'yesterday' 
#

use strict;
my $debug = shift if $ARGV[0] eq '-x';
my $dir = shift or die "yesterday: [-x] <directory> [<days>]";
my $days = shift or 1;
opendir D, $dir or die "cannot open directory '$dir' $!";
my @fn = map {[(stat("$dir/$_"))[9], "$dir/$_"]} readdir D;
closedir D;

++$days;
my $t = time;
my $low = (int($t / 86400) - $days) * 86400;
my $high = (int($t / 86400) - ($days - 1)) * 86400;
my $clow = gmtime $low;
my $chigh = gmtime $high;
print "lowest: $clow highest: $chigh\n" if $debug;
for (sort {$a->[0] <=> $b->[0]} @fn) {
	if (-f $_->[1]) {
		if ($debug) {
			my $cmtime = gmtime $_->[0];
			if ($_->[0] < $low) {
				printf "%-30s LOW $cmtime < $clow\n", $_->[1];
			} elsif ($_->[0] >= $high) {
				printf "%-30s HIGH $cmtime >= $chigh\n", $_->[1];
			} else {
				printf "%-30s OK $cmtime\n", $_->[1];
			}
		} elsif ($_->[0] >= $low && $_->[0] < $high) {
			print "$_->[1]\n";
		} elsif ($_->[0] >= $high) {
			last;
		}
	}
}


exit 0;