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#!/usr/bin/env perl
## Copyright © 2008-2009 by Daniel Friesel <derf@derf.homelinux.org>
## License: WTFPL <http://sam.zoy.org/wtfpl>
use strict;
use warnings;
use Getopt::Long;
use Term::ANSIColor;
my $base = $ENV{HOME};
my ($type, $src, $dst);
my $quiet = 0;
my $remove = 0;
my %substitute;
my $linkfile;
if (-f '.links') {
$linkfile = '.links';
} elsif (-f 'links') {
$linkfile = 'links';
} else {
exit(0);
}
GetOptions(
'q|quiet' => \$quiet,
'r|remove' => \$remove,
'p|parameter=s' => \%substitute,
);
open(LINKS, '<', $linkfile) or die("Can't open $linkfile: $!");
while(<LINKS>) {
chomp;
foreach my $key (keys(%substitute)) {
s/\$$key/$substitute{$key}/g;
}
($type, $src, $dst) = split;
next unless ($type eq 'soft' or $type eq 'hard');
if ($remove) {
remove_link($src);
} elsif ($type eq 'soft') {
check_symlink($src, $dst);
} elsif ($type eq 'hard') {
check_hardlink($src, $dst);
}
}
close(LINKS);
sub remove_link {
my $link = shift;
if (-l "$base/$link") {
unlink("$base/$link") or warn("cannot unlink $base/$link: $!");
print_format('removed', $link, '', 'red');
}
}
sub check_symlink {
my $src = shift;
my $dst = shift;
mkdirs($src);
if (not -l "$base/$src" and not -e "$base/$src") {
symlink($dst, "$base/$src");
print_format('created', $src, $dst, 'cyan');
}
elsif (readlink("$base/$src") eq $dst) {
print_format('ok', $src, $dst, 'green') unless $quiet;
}
elsif (readlink("$base/$src") eq "$base/$dst") {
print_format('absolute', $src, $dst, 'yellow') unless $quiet;
}
elsif (not -l "$base/$src" and -e "$base/$src") {
print colored ("$base/$src: File exists but is not a symlink. Not updating.\n", 'bold red');
}
elsif (-l "$base/$src") {
unlink("$base/$src");
symlink($dst, "$base/$src");
print_format('fixed', $src, $dst, 'cyan');
}
}
sub check_hardlink {
my $src = shift;
my $dst = shift;
mkdirs($src);
if (not -e "$base/$dst") {
print_format('no dst!!', $src, $dst, 'red bold');
}
elsif (not -f "$base/$src") {
link("$base/$dst", "$base/$src") or warn($!);
print_format('created', $src, $dst, 'cyan');
}
elsif ((stat("$base/$src"))[1] != (stat("$base/$dst"))[1]) {
unlink("$base/$src");
link("$base/$dst", "$base/$src") or warn($!);
print_format('updated', $src, $dst, 'cyan');
}
elsif ((stat("$base/$src"))[1] == (stat("$base/$dst"))[1]) {
print_format('ok', $src, $dst, 'green') unless $quiet;
}
}
sub mkdirs {
my $source = shift;
my $path = $base;
my @dirs = split(/\//, $source);
# the last element is the file
pop(@dirs);
foreach(@dirs) {
unless(-d "$path/$_") {
mkdir("$path/$_") or die("Can't create $path/$_: $!");
}
$path .= $_;
}
}
sub print_format {
my ($message, $src, $dst, $color) = @_;
if (defined($color)) {
printf(colored('%-9s', $color), $message);
} else {
printf('%-9s', $message);
}
printf(" %-15s -> %-15s\n", $src, $dst);
}
__END__
=head1 NAME
checklinks - create/update links
=head1 SYNOPSIS
B<checklinks> [ I<options> ]
=head1 DESCRIPTION
Create or update links based on a file
=head1 OPTIONS
=over
=item B<-q>, B<--quiet>
Quiet. Hide unchanged links
=item B<-r>, B<--remove>
Remove all symlinks. Hardlinks will be left as they are.
=item B<-p>, B<--parameter> I<parameter>=I<value>
While reading the links file, replace $I<parameter> with I<value>.
When used in conjuction with pkg(1), $package will be set to the current
package's relative path (as seen from $HOME, like C<packages/core>),
and $etc will be set to $package/etc (like C<packages/core/etc>)
=back
=head1 FILES
The symlink definitions are read from the file F<.links> or F<links> in the
current working directory. Each line contains, separated by spaces:
=over
=item the symlink type
This may be one of 'soft' or 'hard', indicating either a symlink or a hardlink.
=item the source
path of the source, i.e. the link. Relative to $HOME
In symlink mode, the source will only be updated if it either does not exist or
already is a symlink. This should prevent accidental data loss.
Note that in hardlink mode, the source will I<always> be deleted unless it is
already the correct hardlink
=item the target
path of the target, i.e. the link's destination.
This is relative to the source. See L<path_resolution>(7)
=back
Lines beginning with an invalid symlink type will be ignored.
=head1 BUGS
There are no checks whether the symlink target actually exists.
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