bookpicker_unpick

#!/usr/bin/perl
#
# bookpicker_unpick -- try to "undo" a previous bookpicker pick
#

use strict;
use warnings;
use File::stat;
use English qw( -no_match_vars );
use version; our $VERSION = qv('v2017.10.26');

my $listdir = "$ENV{'HOME'}/var/reading_lists";    # list directory

chdir $listdir || die "Could not chdir $listdir: $ERRNO\n";
#
#
# find all list files...
#
opendir( LD, q{.} ) || die "Can't open $listdir: $ERRNO\n";
my @lists = grep {/[.]list$/x} readdir LD;
closedir LD or die "Can't close $listdir: $ERRNO\n";

my $mrm_mtime = 0;
my $mrm_list  = q{};
for my $list (@lists) {
    my $st = stat $list or die "Stat on $list failed: $ERRNO\n";
    if ( $st->mtime > $mrm_mtime ) {
        $mrm_mtime = $st->mtime;
        $mrm_list  = $list;
    }
}

print 'Most recently modified list: ', $mrm_list, ' [',
    scalar localtime($mrm_mtime), "]\n";

if ( stat( $mrm_list . '.old' ) ) {
    if ( rename $mrm_list . '.old', $mrm_list ) {
        print "... previous $mrm_list restored\n";
    }
    else {
        warn "... restoring previous $mrm_list failed\n";
    }
}
else {
    warn "... could not find previous version of $mrm_list, sorry\n";
}