[tgal] / mason / .perl-lib / TrivGal.pm

### -*-cperl-*-
###
### Main output for Trivial Gallery.
###
### (c) 2021 Mark Wooding
###

###----- Licensing notice ---------------------------------------------------
###
### This file is part of Trivial Gallery.
###
### Trivial Gallery is free software: you can redistribute it and/or modify
### it under the terms of the GNU Affero General Public License as
### published by the Free Software Foundation; either version 3 of the
### License, or (at your option) any later version.
###
### Trivial Gallery 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
### Affero General Public License for more details.
###
### You should have received a copy of the GNU Affero General Public
### License along with Trivial Gallery.  If not, see
### <https://www.gnu.org/licenses/>.

package TrivGal;

use autodie qw{:all};

use Errno;
use Exporter qw{import};
use File::stat;
use Image::ExifTool qw{};
use Image::Imlib2;
use Image::Size qw{};
use User::pwent;
use POSIX;

our @EXPORT;
sub export (@) { push @EXPORT, @_; }

###--------------------------------------------------------------------------
### Internal utilities.

sub read_or_set ($\$@) {
  my ($me, $ref, @args) = @_;
  if (@args == 0) { return $$ref; }
  elsif (@args == 1) { $$ref = $args[0]; return $me; }
  elsif (@args > 1) { die "too many arguments"; }
}

###--------------------------------------------------------------------------
### Random utilities.

export qw{join_paths};
sub join_paths (@) {
  my @p = @_;
  my $p = "";
  ELT: for my $e (@p) {
    $e =~ s#^/{2,}#/#;
    $e =~ s#([^/])/+$#$1#;
    if ($e eq "") { next ELT; }
    elsif ($p eq "" || $e =~ m#^/#) { $p = $e; }
    else { $p = "$p/$e"; }
  }
  return $p;
}

export qw{split_path};
sub split_path ($) {
  my ($path) = @_;

  my ($dir, $base, $ext) =
    $path =~ m#^ (?: (.*) /)?
		 (?: ([^/]*) \.)?
		 ([^./]*) $#x;
  if (defined $base) { $ext = ".$ext"; }
  else { $base = $ext; $ext = ""; }
  return ($dir, $base, $ext);
}

export qw{urlencode};
sub urlencode ($) {
  my ($u) = @_;
  $u =~ s#([^0-9a-zA-Z_./~-])#sprintf "%%%02x", ord $1#eg;
  return $u;
}

export qw{urldecode};
sub urldecode ($) {
  my ($u) = @_;
  $u =~ s#\%([0-9a-fA-F]{2})#chr hex $1#eg;
  return $u;
}

###--------------------------------------------------------------------------
### Image types.

our %TYPE;

package TrivGal::ImageType {
  sub new ($$) {
    my ($cls, $ext) = @_;
    return $TYPE{$ext} = bless { ext => $ext }, $cls;
  }
  sub ext ($) {
    my ($me, @args) = @_;
    return $me->{ext};
  }
  sub mimetype ($@) {
    my ($me, @args) = @_;
    return TrivGal::read_or_set $me, $me->{mimetype}, @args;
  }
  sub imlibfmt ($@) {
    my ($me, @args) = @_;
    return TrivGal::read_or_set $me, $me->{imlibfmt}, @args;
  }
}

TrivGal::ImageType->new(".jpg")->mimetype("image/jpeg")->imlibfmt("jpeg");
TrivGal::ImageType->new(".png")->mimetype("image/png")->imlibfmt("png");

###--------------------------------------------------------------------------
### Configuration.

export qw{$SCOPE $SUFFIX};
our $SCOPE //= $::SCOPE;
our $SUFFIX //= $::SUFFIX;

export qw{$IMGROOT $CACHE $TMP};
our $IMGROOT //= "$ENV{HOME}/publish/$SCOPE-html$SUFFIX/tgal-images";
our $CACHE //=
  ($ENV{XDG_CACHE_HOME} // "$ENV{HOME}/.cache") .
  "/tgal/$SCOPE$SUFFIX";
our $TMP //= "$CACHE/tmp";

export qw{$ROOTURL $IMGURL $CACHEURL $STATICURL $SCRIPTURL};
my $user = getpwuid($>)->name;
our $ROOTURL //= "/~$user";
our $IMGURL //= "$ROOTURL/tgal-images";
our $CACHEURL //= "$ROOTURL/tgal-cache";
our $STATICURL //= "$ROOTURL/tgal-static";
our $SCRIPTURL;

export qw{$SRCURL};
our $SRCURL = "https://git.distorted.org.uk/~mdw/tgal/";

export qw{%SIZE};
our %SIZE = (smallthumb => 96,
	     medthumb => 144,
	     bigthumb => 228,
	     small => 480,
	     embed => 720,
	     view => 1200);

export qw{init};
my $initp = 0;
sub init () {
  my $m = HTML::Mason::Request->instance;
  my $r = $m->cgi_request;

  $m->interp->set_escape(u => sub { my ($r) = @_; $$r = urlencode $$r; });

  return unless !$initp;

  $SCRIPTURL //= $r->subprocess_env("SCRIPT_NAME");
  $initp = 1;
}

###--------------------------------------------------------------------------
### Temporary files.

export qw{clean_temp_files};
sub clean_temp_files () {
  my $d;

  eval { opendir $d, $TMP; };
  if ($@) {
    if ($@->isa("autodie::exception") && $@->errno == ENOENT) { return; }
    else { die $@; }
  }
  my $now = time;
  FILE: while (my $name = readdir $d) {
    next FILE unless $name =~ /^t(\d+)\-/;
    my $pid = $1;
    next FILE if kill 0, $pid;
    my $f = "$TMP/$name";
    my $st = stat $name;
    next FILE if $now - $st->mtime() < 300;
    unlink $f;
  }
  closedir $d;
}

###--------------------------------------------------------------------------
### Scaled images.

my %ORIENT =
  (1 => [0, 0],
   2 => [0, 1],
   3 => [2, 0],
   4 => [2, 1],
   5 => [3, 1],
   6 => [1, 0],
   7 => [1, 1],
   8 => [3, 0]);

package TrivGal::Image {
  use File::Path qw{make_path};
  use File::stat;

  sub new ($$) {
    my ($cls, $path) = @_;
    my $imgpath = "$IMGROOT/$path";
    my $st = stat $imgpath or die "no image `$path'";
    return bless {
      path => $path, imgpath => $imgpath,
      mtime => $st->mtime,
      img => undef,
      _wd => undef, _ht => undef,
      sz => undef
    }, $cls;
  }

  sub _getsz ($) {
    my ($me) = @_;
    return if defined $me->{_wd};

    my ($wd, $ht, $err) = Image::Size::imgsize $me->{imgpath};
    defined $wd or die "failed to read size of `$me->{path}': $err";
    my $sz = $wd; if ($sz < $ht) { $sz = $ht; }
    @$me{"_wd", "_ht", "sz"} = ($wd, $ht, $sz);
  }

  sub sz ($) { my ($me) = @_; $me->_getsz; return $me->{sz}; }

  sub scale ($$;$) {
    my ($me, $scale, $forcep) = @_;
    my $m = HTML::Mason::Request->instance;

    my $path = $me->{path};
    my $sz = $SIZE{$scale} or die "unknown scale `$scale'";
    if ($me->sz <= $sz)
      { return $m->interp->apply_escapes("$IMGURL/$path", "u"); }

    my $tail = "scale.$sz/$path";
    my $thumb = "$CACHE/$tail";
    my $thumburl = $m->interp->apply_escapes("$CACHEURL/$tail", "u");
    my $st = stat $thumb;
    if (defined $st && $st->mtime > $me->{mtime}) { return $thumburl; }
    return
      $m->interp->apply_escapes("$SCRIPTURL/$path", "u") . "?scale=$scale"
      unless $forcep;

    my ($dir, $base, $ext) = TrivGal::split_path $thumb;
    my $ty = $TYPE{lc $ext} or die "unknown type `$ext'";

    my $img = $me->{img};
    unless (defined $img) {
      my $exif = new Image::ExifTool;
      $exif->ExtractInfo($me->{imgpath});
      my $orient = $exif->GetValue("Orientation", "ValueConv");
      $img = $me->{img} = Image::Imlib2->load($me->{imgpath});
      if (defined $orient) {
	my ($rot, $flip) = @{$ORIENT{$orient}};
	if ($rot) { $img->image_orientate($rot); }
	if ($flip) { $img->flip_horizontal(); }
      }
    }

    my $sc = $sz/$me->sz;
    my $scaled = $img->create_scaled_image($sc*$wd, $sc*$ht);

    $scaled->image_set_format($ty->imlibfmt);
    $scaled->set_quality(90);
    my $new = "$TMP/t$$-$ext";
    make_path $TMP, { mode => 0771 };
    $scaled->save($new);
    make_path $dir, { mode => 0771 };
    rename $new, $thumb;
    return $thumburl;
  }
}

###--------------------------------------------------------------------------
### Directory listings.

package TrivGal::Item {
  sub new ($$) {
    my ($cls, $name) = @_;
    return bless { name => $name }, $cls;
  }
  sub name ($@) {
    my ($me, @args) = @_;
    return TrivGal::read_or_set $me, $me->{name}, @args;
  }
  sub comment ($@) {
    my ($me, @args) = @_;
    return TrivGal::read_or_set $me, $me->{comment}, @args;
  }
}

export qw{listdir};
sub listdir ($) {
  my ($path) = @_;
  my (@d, @f);
  my $ix = undef;

  $path =~ s#/$##;
  if (-f "$path/.tgal.index") {
    open my $f, "<", "$path/.tgal.index";
    my $item = undef;
    my $comment = undef;
    LINE: while (<$f>) {
      chomp;
      next LINE if /^\s*(\#|$)/;
      if (s/^\s+//) {
	die "no item" unless $item;
	$comment = defined $comment ? $comment . "\n" . $_ : $_;
      } else {
	if ($item && $comment) { $item->comment($comment); }
	my ($flags, $name, $c) =
	  /^ (?: ([-!]+) \s+)?		# flags
	     (\S+) \s*			# filename
	     (\S | \S.*\S )?		# start of the comment
	     \s*
	     $/x;
	my $indexp = $flags =~ /!/;
	my $hidep = $flags =~ /-/;
	$name = urldecode $name;
	my $list;
	$item = TrivGal::Item->new($name);
	if ($name =~ m#/$#) {
	  $list = \@d;
	  die "can't index a folder" if $indexp;
	} else {
	  $list = \@f;
	  my ($dir, $base, $ext) = split_path $name;
	  die "unknown image type" unless $TYPE{lc $ext};
	  if ($indexp) {
	    die "two index images" if defined $ix;
	    $ix = $item;
	  }
	}
	$comment = $c;
	push @$list, $item unless $hidep;
      }
    }
    if ($item && $comment) { $item->comment($comment); }
    close $f;
  } else {
    my $st = stat $path;
    unless ($st->mode&0004) { return ([], [], undef); }

    opendir $d, $path;
    my @e = readdir $d;
    closedir $d;

    ENT: for my $e (sort @e) {
      my ($dir, $base, $ext) = split_path $e;
      my $dotp = $e =~ /^\./;
      my $st = stat "$path/$e";
      my $list = undef;
      if ($dotp) { }
      elsif (-d $st) { $list = \@d; $e .= "/"; }
      elsif ($TYPE{lc $ext} && -f $st) { $list = \@f; }
      $list and push @$list, TrivGal::Item->new($e);
    }
    $ix = $f[0] if @f;
  }

  return (\@d, \@f, $ix);
}

export qw{contents};
sub contents ($) {
  my ($file) = @_;
  my $contents = "";
  my $f;
  local $@;
  eval { open $f, "<", "$file"; };
  if ($@) {
    if ($@->isa("autodie::exception") && $@->errno == ENOENT)
      { return undef; }
    die $@;
  }
  while (sysread $f, $buf, 16384) { $contents .= $buf; }
  close $f;
  return $contents;
}

export qw{find_covering_file};
sub find_covering_file ($$$) {
  my ($top, $path, $name) = @_;
  for (;;) {
    my $stuff = contents "$top/$path/$name"; return $stuff if defined $stuff;
    if ($path eq "") { return undef; }
    if ($path =~ m#^(.*)/[^/]+/?#) { $path = $1; }
    else { $path = ""; }
  }
}

###----- That's all, folks --------------------------------------------------

clean_temp_files;

1;
Commit	Line	Data
6ac5dde2 MW	1	### --cperl--
	2	###
	3	### Main output for Trivial Gallery.
	4	###
	5	### (c) 2021 Mark Wooding
	6	###
	7
	8	###----- Licensing notice ---------------------------------------------------
	9	###
	10	### This file is part of Trivial Gallery.
	11	###
	12	### Trivial Gallery is free software: you can redistribute it and/or modify
	13	### it under the terms of the GNU Affero General Public License as
	14	### published by the Free Software Foundation; either version 3 of the
	15	### License, or (at your option) any later version.
	16	###
	17	### Trivial Gallery is distributed in the hope that it will be useful, but
	18	### WITHOUT ANY WARRANTY; without even the implied warranty of
	19	### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	20	### Affero General Public License for more details.
	21	###
	22	### You should have received a copy of the GNU Affero General Public
	23	### License along with Trivial Gallery. If not, see
	24	### <https://www.gnu.org/licenses/>.
	25
	26	package TrivGal;
	27
	28	use autodie qw{:all};
	29
	30	use Errno;
	31	use Exporter qw{import};
6ac5dde2	32	use File::stat;
bda837fc	33	use Image::ExifTool qw{};
6ac5dde2	34	use Image::Imlib2;
8b97a4e3	35	use Image::Size qw{};
6ac5dde2 MW	36	use User::pwent;
	37	use POSIX;
	38
	39	our @EXPORT;
	40	sub export (@) { push @EXPORT, @_; }
	41
	42	###--------------------------------------------------------------------------
	43	### Internal utilities.
	44
	45	sub read_or_set ($\$@) {
	46	my ($me, $ref, @args) = @_;
	47	if (@args == 0) { return $$ref; }
	48	elsif (@args == 1) { $$ref = $args[0]; return $me; }
	49	elsif (@args > 1) { die "too many arguments"; }
	50	}
	51
	52	###--------------------------------------------------------------------------
	53	### Random utilities.
	54
	55	export qw{join_paths};
	56	sub join_paths (@) {
	57	my @p = @_;
	58	my $p = "";
	59	ELT: for my $e (@p) {
e9eac06d MW	60	$e =~ s#^/{2,}#/#;
e9eac06d MW	61	$e =~ s#([^/])/+$#$1#;
6ac5dde2	62	if ($e eq "") { next ELT; }
e9eac06d	63	elsif ($p eq "" \|\| $e =~ m#^/#) { $p = $e; }
6ac5dde2 MW	64	else { $p = "$p/$e"; }
	65	}
	66	return $p;
	67	}
	68
	69	export qw{split_path};
	70	sub split_path ($) {
	71	my ($path) = @_;
	72
9fc5e8c1 MW	73	my ($dir, $base, $ext) =
	74	$path =~ m#^ (?: (.*) /)?
	75	(?: ([^/]*) \.)?
	76	([^./]*) $#x;
6ac5dde2 MW	77	if (defined $base) { $ext = ".$ext"; }
	78	else { $base = $ext; $ext = ""; }
	79	return ($dir, $base, $ext);
	80	}
	81
	82	export qw{urlencode};
	83	sub urlencode ($) {
	84	my ($u) = @_;
e9eac06d	85	$u =~ s#([^0-9a-zA-Z_./~-])#sprintf "%%%02x", ord $1#eg;
6ac5dde2 MW	86	return $u;
	87	}
	88
	89	export qw{urldecode};
	90	sub urldecode ($) {
	91	my ($u) = @_;
e9eac06d	92	$u =~ s#\%([0-9a-fA-F]{2})#chr hex $1#eg;
6ac5dde2 MW	93	return $u;
	94	}
	95
	96	###--------------------------------------------------------------------------
	97	### Image types.
	98
	99	our %TYPE;
	100
	101	package TrivGal::ImageType {
	102	sub new ($$) {
	103	my ($cls, $ext) = @_;
	104	return $TYPE{$ext} = bless { ext => $ext }, $cls;
	105	}
	106	sub ext ($) {
	107	my ($me, @args) = @_;
	108	return $me->{ext};
	109	}
	110	sub mimetype ($@) {
	111	my ($me, @args) = @_;
	112	return TrivGal::read_or_set $me, $me->{mimetype}, @args;
	113	}
	114	sub imlibfmt ($@) {
	115	my ($me, @args) = @_;
	116	return TrivGal::read_or_set $me, $me->{imlibfmt}, @args;
	117	}
65e4ebfd	118	}
6ac5dde2 MW	119
	120	TrivGal::ImageType->new(".jpg")->mimetype("image/jpeg")->imlibfmt("jpeg");
	121	TrivGal::ImageType->new(".png")->mimetype("image/png")->imlibfmt("png");
	122
	123	###--------------------------------------------------------------------------
	124	### Configuration.
	125
	126	export qw{$SCOPE $SUFFIX};
	127	our $SCOPE //= $::SCOPE;
	128	our $SUFFIX //= $::SUFFIX;
	129
	130	export qw{$IMGROOT $CACHE $TMP};
	131	our $IMGROOT //= "$ENV{HOME}/publish/$SCOPE-html$SUFFIX/tgal-images";
	132	our $CACHE //=
	133	($ENV{XDG_CACHE_HOME} // "$ENV{HOME}/.cache") .
	134	"/tgal/$SCOPE$SUFFIX";
	135	our $TMP //= "$CACHE/tmp";
	136
	137	export qw{$ROOTURL $IMGURL $CACHEURL $STATICURL $SCRIPTURL};
	138	my $user = getpwuid($>)->name;
	139	our $ROOTURL //= "/~$user";
	140	our $IMGURL //= "$ROOTURL/tgal-images";
	141	our $CACHEURL //= "$ROOTURL/tgal-cache";
	142	our $STATICURL //= "$ROOTURL/tgal-static";
	143	our $SCRIPTURL;
	144
a38a867d MW	145	export qw{$SRCURL};
	146	our $SRCURL = "https://git.distorted.org.uk/~mdw/tgal/";
	147
6ac5dde2	148	export qw{%SIZE};
1408b7a2 MW	149	our %SIZE = (smallthumb => 96,
	150	medthumb => 144,
	151	bigthumb => 228,
40c686c2 MW	152	small => 480,
40c686c2 MW	153	embed => 720,
1408b7a2	154	view => 1200);
6ac5dde2 MW	155
	156	export qw{init};
	157	my $initp = 0;
	158	sub init () {
	159	my $m = HTML::Mason::Request->instance;
	160	my $r = $m->cgi_request;
	161
	162	$m->interp->set_escape(u => sub { my ($r) = @_; $$r = urlencode $$r; });
	163
	164	return unless !$initp;
	165
	166	$SCRIPTURL //= $r->subprocess_env("SCRIPT_NAME");
	167	$initp = 1;
	168	}
	169
	170	###--------------------------------------------------------------------------
	171	### Temporary files.
	172
	173	export qw{clean_temp_files};
	174	sub clean_temp_files () {
	175	my $d;
	176
	177	eval { opendir $d, $TMP; };
	178	if ($@) {
	179	if ($@->isa("autodie::exception") && $@->errno == ENOENT) { return; }
	180	else { die $@; }
	181	}
	182	my $now = time;
	183	FILE: while (my $name = readdir $d) {
	184	next FILE unless $name =~ /^t(\d+)\-/;
	185	my $pid = $1;
	186	next FILE if kill 0, $pid;
	187	my $f = "$TMP/$name";
	188	my $st = stat $name;
	189	next FILE if $now - $st->mtime() < 300;
	190	unlink $f;
	191	}
	192	closedir $d;
	193	}
	194
	195	###--------------------------------------------------------------------------
	196	### Scaled images.
	197
bda837fc MW	198	my %ORIENT =
	199	(1 => [0, 0],
	200	2 => [0, 1],
	201	3 => [2, 0],
	202	4 => [2, 1],
	203	5 => [3, 1],
	204	6 => [1, 0],
	205	7 => [1, 1],
	206	8 => [3, 0]);
	207
4e74ddf4 MW	208	package TrivGal::Image {
	209	use File::Path qw{make_path};
	210	use File::stat;
	211
	212	sub new ($$) {
	213	my ($cls, $path) = @_;
	214	my $imgpath = "$IMGROOT/$path";
	215	my $st = stat $imgpath or die "no image `$path'";
	216	return bless {
4fcd273f	217	path => $path, imgpath => $imgpath,
4e74ddf4	218	mtime => $st->mtime,
8b97a4e3 MW	219	img => undef,
	220	_wd => undef, _ht => undef,
	221	sz => undef
4e74ddf4 MW	222	}, $cls;
	223	}
	224
8b97a4e3 MW	225	sub _getsz ($) {
	226	my ($me) = @_;
	227	return if defined $me->{_wd};
	228
	229	my ($wd, $ht, $err) = Image::Size::imgsize $me->{imgpath};
	230	defined $wd or die "failed to read size of `$me->{path}': $err";
	231	my $sz = $wd; if ($sz < $ht) { $sz = $ht; }
	232	@$me{"_wd", "_ht", "sz"} = ($wd, $ht, $sz);
	233	}
	234
	235	sub sz ($) { my ($me) = @_; $me->_getsz; return $me->{sz}; }
	236
784bdf8f MW	237	sub scale ($$;$) {
784bdf8f MW	238	my ($me, $scale, $forcep) = @_;
1b3d6791	239	my $m = HTML::Mason::Request->instance;
4e74ddf4 MW	240
	241	my $path = $me->{path};
	242	my $sz = $SIZE{$scale} or die "unknown scale `$scale'";
373818eb MW	243	if ($me->sz <= $sz)
	244	{ return $m->interp->apply_escapes("$IMGURL/$path", "u"); }
	245
2c1f91c4 MW	246	my $tail = "scale.$sz/$path";
	247	my $thumb = "$CACHE/$tail";
	248	my $thumburl = $m->interp->apply_escapes("$CACHEURL/$tail", "u");
4e74ddf4 MW	249	my $st = stat $thumb;
4e74ddf4 MW	250	if (defined $st && $st->mtime > $me->{mtime}) { return $thumburl; }
784bdf8f MW	251	return
	252	$m->interp->apply_escapes("$SCRIPTURL/$path", "u") . "?scale=$scale"
	253	unless $forcep;
4e74ddf4 MW	254
	255	my ($dir, $base, $ext) = TrivGal::split_path $thumb;
	256	my $ty = $TYPE{lc $ext} or die "unknown type `$ext'";
	257
	258	my $img = $me->{img};
	259	unless (defined $img) {
bda837fc	260	my $exif = new Image::ExifTool;
4fcd273f	261	$exif->ExtractInfo($me->{imgpath});
bda837fc	262	my $orient = $exif->GetValue("Orientation", "ValueConv");
4fcd273f	263	$img = $me->{img} = Image::Imlib2->load($me->{imgpath});
bda837fc MW	264	if (defined $orient) {
	265	my ($rot, $flip) = @{$ORIENT{$orient}};
	266	if ($rot) { $img->image_orientate($rot); }
f6158607	267	if ($flip) { $img->flip_horizontal(); }
bda837fc	268	}
4e74ddf4 MW	269	}
4e74ddf4 MW	270
8b97a4e3	271	my $sc = $sz/$me->sz;
4e74ddf4 MW	272	my $scaled = $img->create_scaled_image($sc$wd, $sc$ht);
	273
	274	$scaled->image_set_format($ty->imlibfmt);
	275	$scaled->set_quality(90);
227d23a0	276	my $new = "$TMP/t$$-$ext";
2306963b	277	make_path $TMP, { mode => 0771 };
4e74ddf4	278	$scaled->save($new);
2306963b	279	make_path $dir, { mode => 0771 };
4e74ddf4 MW	280	rename $new, $thumb;
	281	return $thumburl;
	282	}
6ac5dde2 MW	283	}
	284
	285	###--------------------------------------------------------------------------
	286	### Directory listings.
	287
	288	package TrivGal::Item {
	289	sub new ($$) {
	290	my ($cls, $name) = @_;
	291	return bless { name => $name }, $cls;
	292	}
	293	sub name ($@) {
	294	my ($me, @args) = @_;
	295	return TrivGal::read_or_set $me, $me->{name}, @args;
	296	}
	297	sub comment ($@) {
	298	my ($me, @args) = @_;
	299	return TrivGal::read_or_set $me, $me->{comment}, @args;
	300	}
65e4ebfd	301	}
6ac5dde2 MW	302
	303	export qw{listdir};
	304	sub listdir ($) {
	305	my ($path) = @_;
	306	my (@d, @f);
	307	my $ix = undef;
	308
24f4eac3	309	$path =~ s#/$##;
6ac5dde2 MW	310	if (-f "$path/.tgal.index") {
	311	open my $f, "<", "$path/.tgal.index";
	312	my $item = undef;
	313	my $comment = undef;
	314	LINE: while (<$f>) {
	315	chomp;
	316	next LINE if /^\s*(\#\|$)/;
	317	if (s/^\s+//) {
	318	die "no item" unless $item;
	319	$comment = defined $comment ? $comment . "\n" . $_ : $_;
	320	} else {
	321	if ($item && $comment) { $item->comment($comment); }
9940cc5a	322	my ($flags, $name, $c) =
6e51720c	323	/^ (?: ([-!]+) \s+)? # flags
9fc5e8c1 MW	324	(\S+) \s* # filename
	325	(\S \| \S.*\S )? # start of the comment
	326	\s*
	327	$/x;
9940cc5a	328	my $indexp = $flags =~ /!/;
6e51720c	329	my $hidep = $flags =~ /-/;
6ac5dde2 MW	330	$name = urldecode $name;
6ac5dde2 MW	331	my $list;
0485371e	332	$item = TrivGal::Item->new($name);
e9eac06d	333	if ($name =~ m#/$#) {
6ac5dde2 MW	334	$list = \@d;
	335	die "can't index a folder" if $indexp;
	336	} else {
	337	$list = \@f;
b39b2681	338	my ($dir, $base, $ext) = split_path $name;
6ac5dde2 MW	339	die "unknown image type" unless $TYPE{lc $ext};
	340	if ($indexp) {
	341	die "two index images" if defined $ix;
	342	$ix = $item;
	343	}
	344	}
6ac5dde2	345	$comment = $c;
6e51720c	346	push @$list, $item unless $hidep;
6ac5dde2 MW	347	}
	348	}
	349	if ($item && $comment) { $item->comment($comment); }
	350	close $f;
	351	} else {
ebe19115	352	my $st = stat $path;
32fc7001 MW	353	unless ($st->mode&0004) { return ([], [], undef); }
32fc7001 MW	354
6ac5dde2 MW	355	opendir $d, $path;
	356	my @e = readdir $d;
	357	closedir $d;
	358
	359	ENT: for my $e (sort @e) {
	360	my ($dir, $base, $ext) = split_path $e;
	361	my $dotp = $e =~ /^\./;
	362	my $st = stat "$path/$e";
	363	my $list = undef;
32fc7001	364	if ($dotp) { }
24f4eac3	365	elsif (-d $st) { $list = \@d; $e .= "/"; }
6ac5dde2 MW	366	elsif ($TYPE{lc $ext} && -f $st) { $list = \@f; }
	367	$list and push @$list, TrivGal::Item->new($e);
	368	}
	369	$ix = $f[0] if @f;
	370	}
	371
	372	return (\@d, \@f, $ix);
	373	}
	374
	375	export qw{contents};
	376	sub contents ($) {
	377	my ($file) = @_;
	378	my $contents = "";
	379	my $f;
	380	local $@;
	381	eval { open $f, "<", "$file"; };
	382	if ($@) {
	383	if ($@->isa("autodie::exception") && $@->errno == ENOENT)
	384	{ return undef; }
	385	die $@;
	386	}
	387	while (sysread $f, $buf, 16384) { $contents .= $buf; }
	388	close $f;
	389	return $contents;
	390	}
	391
	392	export qw{find_covering_file};
	393	sub find_covering_file ($$$) {
	394	my ($top, $path, $name) = @_;
	395	for (;;) {
	396	my $stuff = contents "$top/$path/$name"; return $stuff if defined $stuff;
	397	if ($path eq "") { return undef; }
e9eac06d	398	if ($path =~ m#^(.*)/[^/]+/?#) { $path = $1; }
6ac5dde2 MW	399	else { $path = ""; }
	400	}
	401	}
	402
	403	###----- That's all, folks --------------------------------------------------
	404
	405	clean_temp_files;
	406
	407	1;