Config::Tiny(3) Read/Write .ini style files with as little code as possible

SYNOPSIS


# In your configuration file
rootproperty=blah
[section]
one=twp
three= four
Foo =Bar
empty=
# In your program
use Config::Tiny;
# Create a config
my $Config = Config::Tiny->new;
# Open the config
$Config = Config::Tiny->read( 'file.conf' );
$Config = Config::Tiny->read( 'file.conf', 'utf8' ); # Neither ':' nor '<:' prefix!
$Config = Config::Tiny->read( 'file.conf', 'encoding(iso-8859-1)');
# Reading properties
my $rootproperty = $Config->{_}->{rootproperty};
my $one = $Config->{section}->{one};
my $Foo = $Config->{section}->{Foo};
# Changing data
$Config->{newsection} = { this => 'that' }; # Add a section
$Config->{section}->{Foo} = 'Not Bar!'; # Change a value
delete $Config->{_}; # Delete a value or section
# Save a config
$Config->write( 'file.conf' );
$Config->write( 'file.conf', 'utf8' ); # Neither ':' nor '>:' prefix!
# Shortcuts
my($rootproperty) = $$Config{_}{rootproperty};
my($config) = Config::Tiny -> read_string('alpha=bet');
my($value) = $$config{_}{alpha}; # $value is 'bet'.
my($config) = Config::Tiny -> read_string("[init]\nalpha=bet");
my($value) = $$config{init}{alpha}; # $value is 'bet'.

DESCRIPTION

"Config::Tiny" is a Perl class to read and write .ini style configuration files with as little code as possible, reducing load time and memory overhead.

Most of the time it is accepted that Perl applications use a lot of memory and modules.

The *::Tiny family of modules is specifically intended to provide an ultralight alternative to the standard modules.

This module is primarily for reading human written files, and anything we write shouldn't need to have documentation/comments. If you need something with more power move up to Config::Simple, Config::General or one of the many other "Config::*" modules.

Lastly, Config::Tiny does not preserve your comments, whitespace, or the order of your config file.

See Config::Tiny::Ordered (and possibly others) for the preservation of the order of the entries in the file.

CONFIGURATION FILE SYNTAX

Files are the same format as for MS Windows "*.ini" files. For example: 

        [section]
        var1=value1
        var2=value2

If a property is outside of a section at the beginning of a file, it will be assigned to the "root section", available at "$Config->{_}".

Lines starting with '#' or ';' are considered comments and ignored, as are blank lines.

When writing back to the config file, all comments, custom whitespace, and the ordering of your config file elements is discarded. If you need to keep the human elements of a config when writing back, upgrade to something better, this module is not for you.

METHODS

errstr()

Returns a string representing the most recent error, or the empty string.

You can also retrieve the error message from the $Config::Tiny::errstr variable.

new()

The constructor "new" creates and returns an empty "Config::Tiny" object.

read($filename, [$encoding])

Here, the [] indicate an optional parameter.

The "read" constructor reads a config file, $filename, and returns a new "Config::Tiny" object containing the properties in the file.

$encoding may be used to indicate the encoding of the file, e.g. 'utf8' or 'encoding(iso-8859-1)'.

Do not add a prefix to $encoding, such as '<' or '<:'.

Returns the object on success, or "undef" on error.

When "read" fails, "Config::Tiny" sets an error message internally you can recover via "Config::Tiny->errstr". Although in some cases a failed "read" will also set the operating system error variable $!, not all errors do and you should not rely on using the $! variable.

See t/04.utf8.t and t/04.utf8.txt.

read_string($string)

The "read_string" method takes as argument the contents of a config file as a string and returns the "Config::Tiny" object for it.

write($filename, [$encoding])

Here, the [] indicate an optional parameter.

The "write" method generates the file content for the properties, and writes it to disk to the filename specified.

$encoding may be used to indicate the encoding of the file, e.g. 'utf8' or 'encoding(iso-8859-1)'.

Do not add a prefix to $encoding, such as '>' or '>:'.

Returns true on success or "undef" on error.

See t/04.utf8.t and t/04.utf8.txt.

write_string()

Generates the file content for the object and returns it as a string.

FAQ

Why can't I put comments at the ends of lines?

Because a line like: 

        key=value # A comment

Sets key to 'value # A comment' :-(.

This conforms to the syntax discussed in ``CONFIGURATION FILE SYNTAX''.

Why can't I omit the '=' signs?

E.g.: 

        [Things]
        my =
        list =
        of =
        things =

Instead of: 

        [Things]
        my
        list
        of
        things

Because the use of '=' signs is a type of mandatory documentation. It indicates that that section contains 4 items, and not 1 odd item split over 4 lines.

Why do I have to assign the result of a method call to a variable?

This question comes from RT#85386.

Yes, the syntax may seem odd, but you don't have to call both new() and read_string().

Try: 

        perl -MData::Dumper -MConfig::Tiny -E 'my $c=Config::Tiny->read_string("one=s"); say Dumper $c'

Or: 

        my($config) = Config::Tiny -> read_string('alpha=bet');
        my($value)  = $$config{_}{alpha}; # $value is 'bet'.

Or even, a bit ridiculously: 

        my($value) = ${Config::Tiny -> read_string('alpha=bet')}{_}{alpha}; # $value is 'bet'.

Can I use a file called '0' (zero)?

Yes. See t/05.zero.t (test code) and t/0 (test data).

CAVEATS

Unsupported Section Headers

Some edge cases in section headers are not supported, and additionally may not be detected when writing the config file.

Specifically, section headers with leading whitespace, trailing whitespace, or newlines anywhere in the section header, will not be written correctly to the file and may cause file corruption.

Setting an option more than once

"Config::Tiny" will only recognize the first time an option is set in a config file. Any further attempts to set the same option later in the config file are ignored.

SUPPORT

Bugs should be reported via the CPAN bug tracker at

<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Config-Tiny>

For other issues, or commercial enhancement or support, contact the author.

AUTHOR

Adam Kennedy <[email protected]>

Maintanence from V 2.15: Ron Savage <http://savage.net.au/>.

ACKNOWLEGEMENTS

Thanks to Sherzod Ruzmetov <[email protected]> for Config::Simple, which inspired this module by being not quite ``simple'' enough for me :).

COPYRIGHT

Copyright 2002 - 2011 Adam Kennedy.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

The full text of the license can be found in the LICENSE file included with this module.

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