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|
#! /usr/bin/perl
# This file is maintained at http://git.mdcc.cx/draai
# oggsymlinks - maintain a symlink forest
# Copyright (C) 2008 Wessel Dankers <wsl@fruit.je>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
use strict;
use warnings;
use utf8;
use Carp;
my $dot = ord '.';
my $slash = ord '/';
my $verbose = $ENV{'DR_VERBOSE'};
my $debug = $ENV{'DR_DEBUG'};
my $dryrun = $ENV{'DR_DRYRUN'};
my $target = shift @ARGV;
my %target;
opendir TARGET, $target
or croak "Can't open $target: $!";
while(my $artist = readdir TARGET) {
next if ord($artist) == $dot;
my $dir = "$target/$artist";
my %albums;
unless(opendir ARTIST, $dir) {
my $err = $!;
unless(-d $dir) {
carp "$dir is not a directory, skipping";
undef $target{$artist};
next;
}
croak "Can't open $dir: $err";
}
while(my $album = readdir ARTIST) {
next if ord($album) == $dot;
my $link = "$dir/$album";
my $dest = readlink $link;
$albums{$album} = $dest;
unless(defined $dest) {
my $err = $!;
if(!-l $link) {
carp "$link is not a symlink, skipping";
} else {
carp "Can't read symlink $link: $err";
}
next;
}
}
$target{$artist} = \%albums;
}
closedir TARGET;
sub path {
my ($dir, $path) = @_;
return $path if ord($path) == $slash;
return "$dir/$path";
}
my %source;
foreach my $source (@ARGV) {
# strip multiple/trailing slashes
$source =~ s|//+|/|g;
$source =~ s|(.)/$|$1|;
my $psource = path($target, $source);
opendir SOURCE, $psource
or croak "Can't open $psource: $!";
while(my $artist = readdir SOURCE) {
next if ord($artist) == $dot;
my $dir = "$source/$artist";
my $pdir = "$psource/$artist";
my $dude;
$source{$artist} = {} unless exists $source{$artist};
$dude = $source{$artist};
my %albums;
unless(opendir ARTIST, $pdir) {
my $err = $!;
unless(-d $pdir) {
carp "$pdir is not a directory, skipping";
next;
}
croak "Can't open $pdir: $!";
}
while(my $album = readdir ARTIST) {
print "Inspecting $source, $artist, $album\n" if $debug;
next if ord($album) == $dot;
$dude->{$album} = $source;
}
}
closedir SOURCE;
}
# remove redundant/bad symlinks and directories
while(my ($artist, $tartist) = each(%target)) {
next unless defined $tartist;
my $sartist = $source{$artist};
while(my ($album, $link) = each(%$tartist)) {
next unless defined $link;
my $to = "$target/$artist/$album";
if(defined $sartist) {
my $src = $sartist->{$album};
next if
defined $src
and $link eq path('..', "$src/$artist/$album");
}
if($verbose) {
print "Would run: " if $dryrun;
print "unlink $to\n";
}
unless($dryrun) {
unlink $to or croak "Can't create remove $to: $!";
}
delete $tartist->{$album};
}
next if defined $sartist;
next if keys %$tartist;
my $dir = path($target, $artist);
if($verbose) {
print "Would run: " if $dryrun;
print "rmdir $dir\n";
}
unless($dryrun) {
rmdir $dir or warn "Can't rmdir $dir: $!";
}
}
# create missing directories and symlinks
while(my ($artist, $sartist) = each(%source)) {
my $tartist;
if(exists $target{$artist}) {
$tartist = $target{$artist};
next unless defined $tartist;
} else {
my $dir = path($target, $artist);
if($verbose) {
print "Would run: " if $dryrun;
print "mkdir $dir\n";
}
unless($dryrun) {
mkdir $dir or croak "Can't mkdir $dir: $!";
}
$tartist = {};
}
while(my ($album, $src) = each(%$sartist)) {
print "Checking for missing symlinks for $src, $artist, $album\n" if $debug;
next if exists $tartist->{$album};
my $from = path('..', "$src/$artist/$album");
my $to = "$target/$artist/$album";
if($verbose) {
print "Would run: " if $dryrun;
print "symlink $from, $to\n";
}
unless($dryrun) {
symlink $from, $to
or croak "Can't create symlink to $to at $from: $!";
}
}
}
|
