From: Frank Terbeck <ft@grml.org>
Date: Sun, 28 Oct 2007 15:54:54 +0000 (+0100)
Subject: Adding usr_bin/arename.pl and manpages/arename.pl.1
X-Git-Tag: 1.0.22~6
X-Git-Url: http://git.grml.org/?p=grml-scripts.git;a=commitdiff_plain;h=19329328b4bf569b7273e0831f271187af73d665

Adding usr_bin/arename.pl and manpages/arename.pl.1

Adjusted debian/copyright and debian/rules.
---

diff --git a/debian/copyright b/debian/copyright
index c581bdc..1223c8b 100644
--- a/debian/copyright
+++ b/debian/copyright
@@ -13,3 +13,29 @@ Scripts by the grml-team are licensed under GPL v2.
 
 On Debian GNU/Linux systems, the complete text of the GNU General
 Public License can be found in `/usr/share/common-licenses/GPL'.
+
+
+usr_bin/arename.pl:
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+   1. Redistributions of source code must retain the above
+      copyright notice, this list of conditions and the following
+      disclaimer.
+   2. Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials
+      provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS OF THE
+  PROJECT BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+  OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/debian/rules b/debian/rules
index 06b3766..5b5bbc8 100755
--- a/debian/rules
+++ b/debian/rules
@@ -53,7 +53,7 @@ binary-arch: build install
 	dh_testroot
 	dh_installchangelogs
 	dh_installdocs
-	dh_installman manpages/grml-scripts.1 manpages/reread_partition_table.8 manpages/random-hostname.1 \
+	dh_installman manpages/arename.pl.1 manpages/grml-scripts.1 manpages/reread_partition_table.8 manpages/random-hostname.1 \
 	manpages/grml-setkeyboard.8 manpages/grml-setlang.8 manpages/getsf.1 manpages/grml-iptstate.8 manpages/qma.1 manpages/grml-swapon.8 \
 	manpages/grml2ram.8 manpages/gsuggest.1 manpages/dirvish-setup.8 manpages/grml-setservices.8 manpages/grml-quickconfig.8 \
 	manpages/iso-term.1 manpages/alignmargins.8 manpages/get_3ware.1
diff --git a/manpages/arename.pl.1 b/manpages/arename.pl.1
new file mode 100644
index 0000000..3a22652
--- /dev/null
+++ b/manpages/arename.pl.1
@@ -0,0 +1,341 @@
+.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.32
+.\"
+.\" Standard preamble:
+.\" ========================================================================
+.de Sh \" Subsection heading
+.br
+.if t .Sp
+.ne 5
+.PP
+\fB\\$1\fR
+.PP
+..
+.de Sp \" Vertical space (when we can't use .PP)
+.if t .sp .5v
+.if n .sp
+..
+.de Vb \" Begin verbatim text
+.ft CW
+.nf
+.ne \\$1
+..
+.de Ve \" End verbatim text
+.ft R
+.fi
+..
+.\" Set up some character translations and predefined strings.  \*(-- will
+.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
+.\" double quote, and \*(R" will give a right double quote.  \*(C+ will
+.\" give a nicer C++.  Capital omega is used to do unbreakable dashes and
+.\" therefore won't be available.  \*(C` and \*(C' expand to `' in nroff,
+.\" nothing in troff, for use with C<>.
+.tr \(*W-
+.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
+.ie n \{\
+.    ds -- \(*W-
+.    ds PI pi
+.    if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
+.    if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\"  diablo 12 pitch
+.    ds L" ""
+.    ds R" ""
+.    ds C` ""
+.    ds C' ""
+'br\}
+.el\{\
+.    ds -- \|\(em\|
+.    ds PI \(*p
+.    ds L" ``
+.    ds R" ''
+'br\}
+.\"
+.\" If the F register is turned on, we'll generate index entries on stderr for
+.\" titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and index
+.\" entries marked with X<> in POD.  Of course, you'll have to process the
+.\" output yourself in some meaningful fashion.
+.if \nF \{\
+.    de IX
+.    tm Index:\\$1\t\\n%\t"\\$2"
+..
+.    nr % 0
+.    rr F
+.\}
+.\"
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.hy 0
+.if n .na
+.\"
+.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
+.\" Fear.  Run.  Save yourself.  No user-serviceable parts.
+.    \" fudge factors for nroff and troff
+.if n \{\
+.    ds #H 0
+.    ds #V .8m
+.    ds #F .3m
+.    ds #[ \f1
+.    ds #] \fP
+.\}
+.if t \{\
+.    ds #H ((1u-(\\\\n(.fu%2u))*.13m)
+.    ds #V .6m
+.    ds #F 0
+.    ds #[ \&
+.    ds #] \&
+.\}
+.    \" simple accents for nroff and troff
+.if n \{\
+.    ds ' \&
+.    ds ` \&
+.    ds ^ \&
+.    ds , \&
+.    ds ~ ~
+.    ds /
+.\}
+.if t \{\
+.    ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
+.    ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
+.    ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
+.    ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
+.    ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
+.    ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
+.\}
+.    \" troff and (daisy-wheel) nroff accents
+.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
+.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
+.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
+.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
+.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
+.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
+.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
+.ds ae a\h'-(\w'a'u*4/10)'e
+.ds Ae A\h'-(\w'A'u*4/10)'E
+.    \" corrections for vroff
+.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
+.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
+.    \" for low resolution devices (crt and lpr)
+.if \n(.H>23 .if \n(.V>19 \
+\{\
+.    ds : e
+.    ds 8 ss
+.    ds o a
+.    ds d- d\h'-1'\(ga
+.    ds D- D\h'-1'\(hy
+.    ds th \o'bp'
+.    ds Th \o'LP'
+.    ds ae ae
+.    ds Ae AE
+.\}
+.rm #[ #] #H #V #F C
+.\" ========================================================================
+.\"
+.IX Title "ARENAME 1"
+.TH ARENAME 1 "2007-10-28" "perl v5.8.8" "User Contributed Perl Documentation"
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+arename.pl [\s-1OPTION\s0(s)] \s-1FILE\s0(s)...
+.SH "OPTIONS AND ARGUMENTS"
+.IX Header "OPTIONS AND ARGUMENTS"
+.IP "\fB\-d\fR" 8
+.IX Item "-d"
+Go into dryrun mode.
+.IP "\fB\-f\fR" 8
+.IX Item "-f"
+Overwrite files if needed.
+.IP "\fB\-h\fR" 8
+.IX Item "-h"
+Display a short help text.
+.IP "\fB\-V\fR" 8
+.IX Item "-V"
+Display version infomation.
+.IP "\fB\-v\fR" 8
+.IX Item "-v"
+Enable verbose output.
+.IP "\fB\-p\fR <prefix>" 8
+.IX Item "-p <prefix>"
+Define a prefix for destination files.
+.IP "\fB\-T\fR <template>" 8
+.IX Item "-T <template>"
+Define a compilation template.
+.IP "\fB\-t\fR <template>" 8
+.IX Item "-t <template>"
+Define a generic template.
+.IP "\fI\s-1FILE\s0(s)...\fR" 8
+.IX Item "FILE(s)..."
+Input files, that are subject for renaming.
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+\&\fBarename.pl\fR is a tool that is able to rename audio files by looking at
+a file's tagging information, from which it will assemble a consistent
+destination file name. The format of that filename is configurable for the
+user by the use of template strings.
+.PP
+\&\fBarename.pl\fR currently supports two widely used audio formats, namely
+\&\s-1MPEG\s0 Layer3 and ogg vorbis. The format, that \fBarename.pl\fR will assume
+for each input file is determined by the file's filename-extension
+(\fI.mp3\fR vs. \fI.ogg\fR). The extension check is case\-insensitive.
+.PP
+By default, \fBarename.pl\fR will refuse to overwrite destination files,
+if the file in question already exists. You can force overwriting by
+supplying the \fB\-f\fR option.
+.SH "FILES"
+.IX Header "FILES"
+\&\fBarename.pl\fR uses up to two configuration files. As for most programs,
+the script will try to read a configuration file, that is located in the
+user's \fIhome directory\fR. In addition to that, it will try to load \fIlocal\fR
+configuration files, if it finds appropriately named files in the
+\&\fIcurrent directory\fR.
+.IP "\fB~/.arenamerc\fR" 8
+.IX Item "~/.arenamerc"
+per-user global configuration file.
+.IP "\fB./.arename.local\fR" 8
+.IX Item "./.arename.local"
+per-directory local configuration file.
+.Sh "File format"
+.IX Subsection "File format"
+The format of the aforementioned files is pretty simple.
+It is parsed line by line. Empty lines, lines only containing whitespace
+and lines, whose first non whitespace character is a hash character (\fI#\fR)
+are ignored.
+.PP
+Each line consists of one or two parts. If there are two parts,
+they are separated by whitespace. The first part of the line will be used
+as the identifier of a setting (eg. \fIverbose\fR). The second part (read: the
+rest of the line) is used as the value of the setting. (No quoting, or whatsoever
+is required.)
+.PP
+If a line consists of only one part, that means the setting is switched on.
+.Sh "Configuration file example"
+.IX Subsection "Configuration file example"
+.Vb 2
+\&  # switch on verbosity
+\&  verbose
+.Ve
+.PP
+.Vb 2
+\&  # the author is crazy! use a sane template by default. :\-)
+\&  template &artist \- &album (&year) \- &tracknumber. &tracktitle
+.Ve
+.SH "SETTINGS"
+.IX Header "SETTINGS"
+The following settings are supported in all configuration files:
+.IP "\fBcomp_template\fR" 8
+.IX Item "comp_template"
+Defines a template to use with files that provide a compilation tag
+(for 'various artist' CDs, for example). This setting can still be
+overwritten by the \fB\-T\fR command line option. (default value:
+\&\fIva/&album/&tracknumber \- &artist \- &tracktitle\fR)
+.IP "\fBdefault_year\fR" 8
+.IX Item "default_year"
+Defines a default year, for files, that lack this information.
+(default value: \fIundefined\fR)
+.IP "\fBprefix\fR" 8
+.IX Item "prefix"
+Defines a prefix for destination files. This setting can still be
+overwritten by the \fB\-p\fR command line option. (default value: \fI.\fR)
+.IP "\fBsepreplace\fR" 8
+.IX Item "sepreplace"
+Tagging information strings may contain slashes, which is a pretty bad
+idea on most filesystems. Therefore, you can define a string, that replaces
+slashes with the value of this setting. (default value: \fI_\fR)
+.IP "\fBtemplate\fR" 8
+.IX Item "template"
+Defines a template to use with files that do not provide a compilation tag
+(or where the compilation tag and the artist tag are exactly the same).
+This setting can still be overwritten by the \fB\-T\fR command line option.
+(default value: \fI&artist[1]/&artist/&album/&tracknumber \- &tracktitle\fR)
+.IP "\fBtnpad\fR" 8
+.IX Item "tnpad"
+This defines the width, to which the tracknumber field is padded with zeros
+on the left. (default value: \fI2\fR)
+.IP "\fBverbose\fR" 8
+.IX Item "verbose"
+Switches on verbosity by default. (default value: \fIoff\fR)
+.SH "TEMPLATE FORMAT"
+.IX Header "TEMPLATE FORMAT"
+\&\fBarename.pl\fR's templates are quite simple, yet powerful.
+.PP
+At simplest, a template is just a fixes character string. However, that would
+not be exactly useful. So, the script is able to expand certain expressions
+with information gathered from the file's tagging information.
+.PP
+The expressions can have two slightly different forms:
+.IP "\fB&\fR\fIidentifier\fR" 8
+.IX Item "&identifier"
+The simple form.
+.IP "\fB&\fR\fIidentifier\fR\fB[\fR\fIlength\fR\fB]\fR" 8
+.IX Item "&identifier[length]"
+The \*(L"complex\*(R" form. The \fIlength\fR argument in square brackets defines the
+maximum length, to which the expression should be expanded.
+.Sh "Available expression identifiers"
+.IX Subsection "Available expression identifiers"
+The data, that is expanded is derived from tagging information in
+the audio files. For \fI.ogg\fR files, the tag checking \fBarename.pl\fR does
+is case insensitive and the first matching tag will be used.
+.IP "\fBalbum\fR" 8
+.IX Item "album"
+Guess.
+.IP "\fBartist\fR" 8
+.IX Item "artist"
+Guess again.
+.IP "\fBcompilation\fR" 8
+.IX Item "compilation"
+For \fI.ogg\fR this is filled with information found in the 'albumartist' tag.
+For \fI.mp3\fR this is filled with information from the id3v2 \s-1TPE2\s0 frame.
+If the mp3 file only provides a id3v1 tag, this is not supported.
+.IP "\fBtracknumber\fR" 8
+.IX Item "tracknumber"
+The number of the position of the track on the disc. Obviously. However, this
+can be in the form of '12' or '12/23'. In the second form, only the part left
+of the slash is used. The tracknumber is a little special, as you can defined
+to what width it should be padded with zeros on the left (see \fItnpad\fR setting
+in \*(L"\s-1SETTINGS\s0\*(R" in \fIarename\fR\|(1)).
+.IP "\fBtracktitle\fR" 8
+.IX Item "tracktitle"
+Well...
+.IP "\fByear\fR" 8
+.IX Item "year"
+Year (id3v1), \s-1TYER\s0 (id3v2) or \s-1DATE\s0 tag (.ogg).
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fIOgg::Vorbis::Header\fR\|(3) and \fIMP3::Tag\fR\|(3).
+.SH "AUTHOR"
+.IX Header "AUTHOR"
+Frank Terbeck <ft@bewatermyfriend.org>,
+.PP
+Please report bugs.
+.SH "LICENSE"
+.IX Header "LICENSE"
+.Vb 2
+\& Copyright 2007
+\& Frank Terbeck <ft@bewatermyfriend.org>, All rights reserved.
+.Ve
+.PP
+.Vb 3
+\& Redistribution and use in source and binary forms, with or without
+\& modification, are permitted provided that the following conditions
+\& are met:
+.Ve
+.PP
+.Vb 7
+\&   1. Redistributions of source code must retain the above
+\&      copyright notice, this list of conditions and the following
+\&      disclaimer.
+\&   2. Redistributions in binary form must reproduce the above
+\&      copyright notice, this list of conditions and the following
+\&      disclaimer in the documentation and/or other materials
+\&      provided with the distribution.
+.Ve
+.PP
+.Vb 11
+\&  THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+\&  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+\&  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+\&  DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS OF THE
+\&  PROJECT BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+\&  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+\&  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+\&  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+\&  OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+\&  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+\&  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.Ve
diff --git a/usr_bin/arename.pl b/usr_bin/arename.pl
new file mode 100755
index 0000000..465df5f
--- /dev/null
+++ b/usr_bin/arename.pl
@@ -0,0 +1,793 @@
+#!/usr/bin/perl
+use warnings;
+use strict;
+
+use Getopt::Std;
+use File::Basename;
+use File::Copy;
+use MP3::Tag;
+use Ogg::Vorbis::Header;
+
+# documentation {{{
+=head1 NAME
+
+arename.pl - automatically rename audio files by tagging information
+
+=head1 SYNOPSIS
+
+arename.pl [OPTION(s)] FILE(s)...
+
+=head1 OPTIONS AND ARGUMENTS
+
+=over 8
+
+=item B<-d>
+
+Go into dryrun mode.
+
+=item B<-f>
+
+Overwrite files if needed.
+
+=item B<-h>
+
+Display a short help text.
+
+=item B<-V>
+
+Display version infomation.
+
+=item B<-v>
+
+Enable verbose output.
+
+=item B<-p> E<lt>prefixE<gt>
+
+Define a prefix for destination files.
+
+=item B<-T> E<lt>templateE<gt>
+
+Define a compilation template.
+
+=item B<-t> E<lt>templateE<gt>
+
+Define a generic template.
+
+=item I<FILE(s)...>
+
+Input files, that are subject for renaming.
+
+=back
+
+=head1 DESCRIPTION
+
+B<arename.pl> is a tool that is able to rename audio files by looking at
+a file's tagging information, from which it will assemble a consistent
+destination file name. The format of that filename is configurable for the
+user by the use of template strings.
+
+B<arename.pl> currently supports two widely used audio formats, namely
+MPEG Layer3 and ogg vorbis. The format, that B<arename.pl> will assume
+for each input file is determined by the file's filename-extension
+(I<.mp3> vs. I<.ogg>). The extension check is case-insensitive.
+
+By default, B<arename.pl> will refuse to overwrite destination files,
+if the file in question already exists. You can force overwriting by
+supplying the B<-f> option.
+
+=head1 FILES
+
+B<arename.pl> uses up to two configuration files. As for most programs,
+the script will try to read a configuration file, that is located in the
+user's I<home directory>. In addition to that, it will try to load I<local>
+configuration files, if it finds appropriately named files in the
+I<current directory>.
+
+=over 8
+
+=item B<~/.arenamerc>
+
+per-user global configuration file.
+
+=item B<./.arename.local>
+
+per-directory local configuration file.
+
+=back
+
+=head2 File format
+
+The format of the aforementioned files is pretty simple.
+It is parsed line by line. Empty lines, lines only containing whitespace
+and lines, whose first non whitespace character is a hash character (I<#>)
+are ignored.
+
+Each line consists of one or two parts. If there are two parts,
+they are separated by whitespace. The first part of the line will be used
+as the identifier of a setting (eg. I<verbose>). The second part (read: the
+rest of the line) is used as the value of the setting. (No quoting, or whatsoever
+is required.)
+
+If a line consists of only one part, that means the setting is switched on.
+
+=head2 Configuration file example
+
+  # switch on verbosity
+  verbose
+
+  # the author is crazy! use a sane template by default. :-)
+  template &artist - &album (&year) - &tracknumber. &tracktitle
+
+=head1 SETTINGS
+
+The following settings are supported in all configuration files:
+
+=over 8
+
+=item B<comp_template>
+
+Defines a template to use with files that provide a compilation tag
+(for 'various artist' CDs, for example). This setting can still be
+overwritten by the B<-T> command line option. (default value:
+I<va/&album/&tracknumber - &artist - &tracktitle>)
+
+=item B<default_year>
+
+Defines a default year, for files, that lack this information.
+(default value: I<undefined>)
+
+=item B<prefix>
+
+Defines a prefix for destination files. This setting can still be
+overwritten by the B<-p> command line option. (default value: I<.>)
+
+=item B<sepreplace>
+
+Tagging information strings may contain slashes, which is a pretty bad
+idea on most filesystems. Therefore, you can define a string, that replaces
+slashes with the value of this setting. (default value: I<_>)
+
+=item B<template>
+
+Defines a template to use with files that do not provide a compilation tag
+(or where the compilation tag and the artist tag are exactly the same).
+This setting can still be overwritten by the B<-T> command line option.
+(default value: I<&artist[1]/&artist/&album/&tracknumber - &tracktitle>)
+
+=item B<tnpad>
+
+This defines the width, to which the tracknumber field is padded with zeros
+on the left. (default value: I<2>)
+
+=item B<verbose>
+
+Switches on verbosity by default. (default value: I<off>)
+
+=back
+
+=head1 TEMPLATE FORMAT
+
+B<arename.pl>'s templates are quite simple, yet powerful.
+
+At simplest, a template is just a fixes character string. However, that would
+not be exactly useful. So, the script is able to expand certain expressions
+with information gathered from the file's tagging information.
+
+The expressions can have two slightly different forms:
+
+=over 8
+
+=item B<&>I<identifier>
+
+The simple form.
+
+=item B<&>I<identifier>B<[>I<length>B<]>
+
+The "complex" form. The I<length> argument in square brackets defines the
+maximum length, to which the expression should be expanded.
+
+=back
+
+=head2 Available expression identifiers
+
+The data, that is expanded is derived from tagging information in
+the audio files. For I<.ogg> files, the tag checking B<arename.pl> does
+is case insensitive and the first matching tag will be used.
+
+=over 8
+
+=item B<album>
+
+Guess.
+
+=item B<artist>
+
+Guess again.
+
+=item B<compilation>
+
+For I<.ogg> this is filled with information found in the 'albumartist' tag.
+For I<.mp3> this is filled with information from the id3v2 TPE2 frame.
+If the mp3 file only provides a id3v1 tag, this is not supported.
+
+=item B<tracknumber>
+
+The number of the position of the track on the disc. Obviously. However, this
+can be in the form of '12' or '12/23'. In the second form, only the part left
+of the slash is used. The tracknumber is a little special, as you can defined
+to what width it should be padded with zeros on the left (see I<tnpad> setting
+in L<arename(1)/SETTINGS>).
+
+=item B<tracktitle>
+
+Well...
+
+=item B<year>
+
+Year (id3v1), TYER (id3v2) or DATE tag (.ogg).
+
+=back
+
+=head1 SEE ALSO
+
+L<Ogg::Vorbis::Header(3)> and L<MP3::Tag(3)>.
+
+=head1 AUTHOR
+
+Frank Terbeck E<lt>ft@bewatermyfriend.orgE<gt>,
+
+Please report bugs.
+
+=head1 LICENSE
+
+ Copyright 2007
+ Frank Terbeck <ft@bewatermyfriend.org>, All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+   1. Redistributions of source code must retain the above
+      copyright notice, this list of conditions and the following
+      disclaimer.
+   2. Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials
+      provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS OF THE
+  PROJECT BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+  OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+=cut
+#}}}
+# variables {{{
+my (
+    %defaults, %methods, %opts,
+    $dryrun, $comp_template, $force, $prefix,
+    $sepreplace, $template, $tnpad, $verbose
+);
+my ($NAME, $VERSION) = ( 'arename.pl', 'v0.3' );
+#}}}
+sub apply_defaults { #{{{
+    my ($datref) = @_;
+
+    foreach my $key (keys %defaults) {
+        if (!defined $datref->{$key}) {
+            if ($verbose) {
+                print "  -!- Setting ($key) to \"$defaults{$key}\".\n";
+            }
+            $datref->{$key} = $defaults{$key};
+        }
+    }
+}
+#}}}
+sub arename { #{{{
+    my ($file, $datref, $ext) = @_;
+    my ($t, $newname);
+
+    apply_defaults($datref);
+
+    if ($verbose) { #{{{
+        print "  -!- Artist     : \"" .
+            (defined $datref->{artist}      ? $datref->{artist}      : "-.-")
+            . "\"\n";
+        print "  -!- Compilation: \"" .
+            (defined $datref->{compilation} ? $datref->{compilation} : "-.-")
+            . "\"\n";
+        print "  -!- Album      : \"" .
+            (defined $datref->{album}       ? $datref->{album}       : "-.-")
+            . "\"\n";
+        print "  -!- Tracktitle : \"" .
+            (defined $datref->{tracktitle}  ? $datref->{tracktitle}  : "-.-")
+            . "\"\n";
+        print "  -!- Tracknumber: \"" .
+            (defined $datref->{tracknumber} ? $datref->{tracknumber} : "-.-")
+            . "\"\n";
+        print "  -!- Year       : \"" .
+            (defined $datref->{year}        ? $datref->{year}        : "-.-")
+            . "\"\n";
+    } #}}}
+
+    if (defined $datref->{compilation}
+        && $datref->{compilation} ne $datref->{artist}) {
+
+        $t = $comp_template;
+    } else {
+        $t = $template;
+    }
+
+    $newname = expand_template($t, $datref);
+    if (!defined $newname) {
+        return;
+    }
+
+    $newname = $prefix . '/' . $newname . '.' . $ext;
+
+    if (file_eq($newname, $file)) {
+        print "  -!- ($file)\n      would stay the way it is, skipping.\n";
+        return;
+    }
+
+    if (-e $newname && !$force) {
+        print "  -!- ($newname) exists.\n      use '-f' to force overwriting.\n";
+        return;
+    }
+
+    ensure_dir(dirname($newname));
+
+    print "  -!- mv '$file' \\\n" . 
+          "         '$newname'\n";
+
+    if (!$dryrun) {
+        xrename($file, $newname);
+    }
+}
+#}}}
+sub ensure_dir { #{{{
+    # think: mkdir -p /foo/bar/baz
+    my ($wantdir) = @_;
+    my (@parts, $sofar);
+
+    if (-d $wantdir) {
+        return;
+    }
+
+    if ($wantdir =~ '^/') {
+        $sofar = '/';
+    } else {
+        $sofar = '';
+    }
+
+    @parts = split(/\//, $wantdir);
+    foreach my $part (@parts) {
+        if ($part eq '') {
+            next;
+        }
+        $sofar = (
+                  $sofar eq ''
+                    ? $part
+                    : (
+                        $sofar eq '/'
+                          ? '/' . $part
+                          : $sofar . "/" . $part
+                      )
+                 );
+
+        if (!-d $sofar) {
+            if ($dryrun || $verbose) {
+                print "  -!- mkdir \"$sofar\"\n";
+            }
+            if (!$dryrun) {
+                mkdir($sofar) or die "  -!- Could not mkdir($sofar).\n" .
+                                     "  -!- Reason: $!\n";
+            }
+        }
+    }
+}
+#}}}
+sub expand_template { #{{{
+    my ($template, $datref) = @_;
+    my @tags = (
+        'album',
+        'artist',
+        'compilation',
+        'tracknumber',
+        'tracktitle',
+        'year'
+    );
+
+    foreach my $tag (@tags) {
+        my ($len, $token);
+
+        while ($template =~ m/&$tag(\[(\d+)\]|)/) {
+            $len = 0;
+            if (defined $2) { $len = $2; }
+
+            if (!defined $datref->{$tag} || $datref->{$tag} eq '') {
+                warn "  -!- $tag not defined, but required by template. Giving up.\n";
+                return undef;
+            }
+
+            if ($len > 0) {
+                $token = substr($datref->{$tag}, 0, $len);
+            } else {
+                if ($tag eq 'tracknumber') {
+                    my $val;
+                    if ($datref->{$tag} =~ m/^([^\/]*)\/.*$/) {
+                        $val = $1;
+                    } else {
+                        $val = $datref->{$tag};
+                    }
+                    $token = sprintf "%0" . $tnpad . "d", $val;
+                } else {
+                    $token = $datref->{$tag};
+                }
+            }
+            if ($token =~ m!/!) {
+                if ($verbose) {
+                    print "  -!- Found directory seperator in token.\n";
+                    print "  -!- Replacing with \"$sepreplace\".\n";
+                }
+                $token =~ s!/!$sepreplace!g;
+            }
+            $template =~ s/&$tag(\[(\d+)\]|)/$token/;
+        }
+    }
+
+    return $template;
+}
+#}}}
+sub file_eq { #{{{
+    my ($f0, $f1) = @_;
+    my (@stat0, @stat1);
+
+    if (!-e $f0 || !-e $f1) {
+        # one of the two doesn't even exist, can't be the same then.
+        return 0;
+    }
+
+    @stat0 = stat $f0 or die "Could not stat($f0): $!\n";
+    @stat1 = stat $f1 or die "Could not stat($f1): $!\n";
+
+    if ($stat0[0] == $stat1[0] && $stat0[1] == $stat1[1]) {
+        # device and inode are the same. same file.
+        return 1;
+    }
+
+    return 0;
+}
+#}}}
+sub process_mp3 { #{{{
+    my ($file) = @_;
+    my ($mp3, %data, $info);
+
+    $mp3 = MP3::Tag->new($file);
+
+    if (!defined $mp3) {
+        print "  -!- Failed to open \"$file\".\n  -!- Reason: $!\n";
+        return;
+    }
+
+    $mp3->get_tags;
+
+    if (!exists $mp3->{ID3v1} && !exists $mp3->{ID3v2}) {
+        print "  -!- No tag found. Ignoring.\n";
+        $mp3->close();
+        return;
+    }
+
+    if (exists $mp3->{ID3v2}) {
+        ($data{artist},      $info) = $mp3->{ID3v2}->get_frame("TPE1");
+        ($data{compilation}, $info) = $mp3->{ID3v2}->get_frame("TPE2");
+        ($data{album},       $info) = $mp3->{ID3v2}->get_frame("TALB");
+        ($data{tracktitle},  $info) = $mp3->{ID3v2}->get_frame("TIT2");
+        ($data{tracknumber}, $info) = $mp3->{ID3v2}->get_frame("TRCK");
+        ($data{year},        $info) = $mp3->{ID3v2}->get_frame("TYER");
+    } elsif (exists $mp3->{ID3v1}) {
+        print "  -!- Only found ID3v1 tag.\n";
+        $data{artist}      = $mp3->{ID3v1}->artist;
+        $data{album}       = $mp3->{ID3v1}->album;
+        $data{tracktitle}  = $mp3->{ID3v1}->title;
+        $data{tracknumber} = $mp3->{ID3v1}->track;
+        $data{year}        = $mp3->{ID3v1}->year;
+    }
+
+    $mp3->close();
+
+    arename($file, \%data, 'mp3');
+}
+#}}}
+sub process_ogg { #{{{
+    my ($file) = @_;
+    my ($ogg, %data, @tags);
+
+    $ogg = Ogg::Vorbis::Header->load($file);
+
+    if (!defined $ogg) {
+        print "  -!- Failed to open \"$file\".\n  -!- Reason: $!\n";
+        return;
+    }
+
+    @tags = $ogg->comment_tags;
+
+    foreach my $tag (@tags) {
+        my ($realtag, $value);
+        if (!(
+                $tag =~ m/^ALBUM$/i         ||
+                $tag =~ m/^ARTIST$/i        ||
+                $tag =~ m/^TITLE$/i         ||
+                $tag =~ m/^TRACKNUMBER$/i   ||
+                $tag =~ m/^DATE$/i          ||
+                $tag =~ m/^ALBUMARTIST$/i
+            )) { next; }
+
+        $value = join(' ', $ogg->comment($tag));
+        if ($tag =~ m/^ALBUM$/i) {
+            $realtag = 'album';
+        } elsif ($tag =~ m/^ARTIST$/i) {
+            $realtag = 'artist';
+        } elsif ($tag =~ m/^TITLE$/i) {
+            $realtag = 'tracktitle';
+        } elsif ($tag =~ m/^TRACKNUMBER$/i) {
+            $realtag = 'tracknumber';
+        } elsif ($tag =~ m/^DATE$/i) {
+            $realtag = 'year';
+        } elsif ($tag =~ m/^ALBUMARTIST$/i) {
+            $realtag = 'compilation';
+        } else {
+            die "This should not happen. Report this BUG. ($tag, $value)";
+        }
+
+        if (!defined $data{$realtag}) {
+            $data{$realtag} = $value;
+        }
+    }
+
+    arename($file, \%data, 'ogg');
+}
+#}}}
+sub process_warn { #{{{
+    my ($file) = @_;
+
+    warn "  -!- No method for handling \"$file\".\n";
+}
+#}}}
+sub rcload { #{{{
+    my ($file, $desc) = @_;
+    my ($fh, $retval);
+    my $count = 0;
+    my $lnum  = 0;
+
+    if (!open($fh, "<$file")) {
+        warn "Failed to read $desc ($file).\n  -!- Reason: $!\n";
+        return 1;
+    }
+
+    print "Reading \"$file\"...\n";
+
+    while (my $line = <$fh>) {
+        chomp($line);
+        $lnum++;
+
+        if ($line =~ m/^\s*#/ || $line =~ m/^\s*$/) {
+            next;
+        }
+
+        $line =~ s/^\s*//;
+        my ($key,$val) = split(/\s+/, $line, 2);
+
+        if ($key eq 'template') {
+            $template = $val;
+        } elsif ($key eq 'comp_template') {
+            $comp_template = $val;
+        } elsif ($key eq 'default_year') {
+            $defaults{year} = $val;
+        } elsif ($key eq 'sepreplace') {
+            $sepreplace = (defined $val ? $val : "");
+        } elsif ($key eq 'tnpad') {
+            $tnpad = $val;
+        } elsif ($key eq 'verbose') {
+            $verbose = 1;
+        } elsif ($key eq 'prefix') {
+            $prefix = $val;
+        } else {
+            warn "$file,$lnum: invalid line '$line'.\n";
+            return -1;
+        }
+
+        $count++;
+    }
+    close $fh;
+
+    print "  -!- Read $desc.\n  -!- $count valid items.\n";
+    return 0;
+}
+#}}}
+sub xrename { #{{{
+    # a rename() replacement, that implements renames across
+    # filesystems via File::copy() + unlink().
+    # This assumes, that source and destination directory are
+    # there, because it stat()s them, to check if it can use
+    # rename().
+    my ($src, $dest) = @_;
+    my (@stat0, @stat1, $d0, $d1, $cause);
+
+    $d0 = dirname($src);
+    $d1 = dirname($dest);
+    @stat0 = stat $d0 or die "Could not stat($d0): $!\n";
+    @stat1 = stat $d1 or die "Could not stat($d1): $!\n";
+
+    if ($stat0[0] == $stat1[0]) {
+        $cause = 'rename';
+        rename $src, $dest or goto err;
+    } else {
+        $cause = 'copy';
+        copy($src, $dest) or goto err;
+        $cause = 'unlink';
+        unlink $src or goto dir;
+    }
+
+    return 0;
+
+err:
+    die "  -!- Could not rename($src, $dest);\n" .
+        "  -!- Reason: $cause(): $!\n";
+}
+#}}}
+# handle options {{{
+
+if ($#ARGV == -1) {
+    $opts{h} = 1;
+} else {
+    if (!getopts('dfhVvp:T:t:', \%opts)) {
+        if (exists $opts{t} && !defined $opts{t}) {
+            die " -t *requires* a string argument!\n";
+        } elsif (exists $opts{T} && !defined $opts{T}) {
+            die " -T *requires* a string argument!\n";
+        } elsif (exists $opts{p} && !defined $opts{p}) {
+            die " -p *requires* a string argument!\n";
+        } else {
+            die "    Try $NAME -h\n";
+        }
+    }
+}
+
+if (defined $opts{h}) {
+    print " Usage:\n  $NAME [-d,-f,-h,-V,-v,-p <prefix>,-[Tt] <template>] FILE(s)...\n\n";
+    print "    -d                Go into dryrun mode.\n";
+    print "    -f                Overwrite files if needed.\n";
+    print "    -h                Display this help text.\n";
+    print "    -V                Display version infomation.\n";
+    print "    -v                Enable verbose output.\n";
+    print "    -p <prefix>       Define a prefix for destination files.\n";
+    print "    -T <template>     Define a compilation template.\n";
+    print "    -t <template>     Define a generic template.\n";
+    print "\n";
+    exit 0;
+}
+
+if (defined $opts{V}) {
+    print " $NAME $VERSION\n";
+    exit 0;
+}
+
+#}}}
+# set defaults {{{
+
+$dryrun        = 0;
+$force         = 0;
+$prefix        = '.';
+$sepreplace    = '_';
+$tnpad         = 2;
+$verbose       = 0;
+$comp_template = "va/&album/&tracknumber - &artist - &tracktitle";
+$template      = "&artist[1]/&artist/&album/&tracknumber - &tracktitle";
+
+#}}}
+# reading config file(s) {{{
+
+my $rc = $ENV{HOME} . "/.arenamerc";
+my $retval = rcload($rc, "arename.pl configuration");
+if ($retval < 0) {
+    die "Error(s) in \"$rc\". Aborting.\n";
+} elsif ($retval > 0) {
+    warn "Error opening configuration; using defaults.\n";
+}
+
+if (-r "./.arename.local") {
+    $rc = "./.arename.local";
+    $retval = rcload($rc, "local configuration");
+    if ($retval < 0) {
+        die "Error(s) in \"$rc\". Aborting.\n";
+    } elsif ($retval > 0) {
+        warn "Error opening local configuration.\n";
+    }
+}
+
+print "\n";
+
+#}}}
+# let cmd line options overwrite {{{
+
+if ($#ARGV == -1) {
+    die "No input files. See: $NAME -h\n";
+}
+
+if (defined $opts{f}) {
+    $force = $opts{f};
+}
+
+if (defined $opts{p}) {
+    $prefix = $opts{p};
+}
+
+if (defined $opts{t}) {
+    $template = $opts{t};
+}
+
+if (defined $opts{T}) {
+    $comp_template = $opts{T};
+}
+
+if (defined $opts{d}) {
+    $dryrun = $opts{d};
+}
+
+if (defined $opts{v}) {
+    $verbose = $opts{v};
+}
+
+undef %opts;
+
+#}}}
+# process what's left on the commandline aka. main() {{{
+%methods = (
+    '.mp3$' => \&process_mp3,
+    '.ogg$' => \&process_ogg
+);
+
+if ($dryrun) {
+    print "+++ We are on a dry run!\n";
+}
+
+if ($verbose) {
+    print "+++ Running verbose.\n";
+}
+
+if ($dryrun || $verbose) {
+    print "\n";
+}
+
+foreach my $file (@ARGV) {
+    my $done = 0;
+    print "Processing: $file\n";
+    if (-l $file) {
+        warn "  -!- Refusing to handle symbolic links ($file).\n";
+        next;
+    }
+    if (! -r $file) {
+        warn "  -!- Can't read \"$file\": $!\n";
+        next;
+    }
+
+    foreach my $method (sort keys %methods) {
+        if ($file =~ m!$method!i) {
+            $methods{$method}->($file);
+            $done = 1;
+        }
+    }
+
+    if (!$done) {
+        process_warn($file);
+    }
+}
+#}}}