NAME

SYNOPSIS

    # default config format is a space-separated file
    company    "Supercool, Inc."
    support    nobody@nowhere.com


    # and then in Perl
    use Config::Fast;

    %cf = fastconfig;

    print "Thanks for visiting $cf{company}!\n";
    print "Please contact $cf{support} for support.\n";

DESCRIPTION

Here's how it works:

    %cf = fastconfig($file, $delim);

Basically, the "fastconfig()" function returns a hash of keys and values based on the directives in your configuration file. By default, directives and values are separated by whitespace in the config file, but this can be easily changed with the delimiter argument (see below).

When the configuration file is read, its modification time is first checked and the results cached. On each call to "fastconfig()", if the config file has been changed, then the file is reread. Otherwise, the cached results are returned automatically. This makes this module great for "mod_perl" modules and scripts, one of the primary reasons I wrote it. Simply include this at the top of your script or inside of your constructor function:

    my %cf = fastconfig('/path/to/config/file.conf');

If the file argument is omitted, then "fastconfig()" looks for a file named "$0.conf" in the "../etc" directory relative to the executable. For example, if you ran:

    /usr/local/bin/myapp

Then "fastconfig()" will automatically look for:

    /usr/local/etc/myapp.conf

This is great if you're really lazy and always in a hurry, like I am.

If this doesn't work for you, simply supply a filename manually. Note that filename generation does not work in "mod_perl", so you'll need to supply a filename manually.

FILE FORMAT

    company     Hardwood Flooring Supplies, Inc.

Would result in:

    $cf{company} = 'Hardwood Flooring Supplies, Inc.';

Of course, you can use the delimiter argument to change the delimiter to anything you want. To read Bourne shell style files, you would use:

    %cf = fastconfig($file, '=');

This would let you read a file of the format:

    system=Windows
    kernel=sortof

In all formats, any space around the value is stripped. This is one situation where you must include quotes:

    greeting="     Some leading and trailing space    "

Each configuration directive is read sequentially and placed in the hash. If the same directive is present multiple times, the last one will override any earlier ones.

In addition, you can reuse previously-defined variables by preceding them with a "$" sign. Hopefully this seems logical to you.

    owner       Bill Johnson
    company     $owner and Company, Ltd.
    website     http://www.billjohnsonltd.com
    products    $website/newproducts.html

Of course, you can include literal characters by escaping them:

    price       \$5.00
    streetname  "Guido \"The Enforcer\" Scorcese"
    verbatim    'Single "quotes" are $$ money @ night'
    fileregex   '(\.exe|\.bat)$'

Basically, this modules attempts to mimic, as closely as possible, Perl's own single and double quoting conventions.

Variable names are case-insensitive by default (see "KEEPCASE"). In this example, the last setting of "ORACLE_HOME" will win:

    oracle_home /oracle
    Oracle_Home /oracle/orahome1
    ORACLE_HOME /oracle/OraHome2

In addition, variables are converted to lowercase before being returned from "fastconfig()", meaning you would access the above as:

    print $cf{oracle_home};     # /oracle/OraHome2

Speaking of which, an extra nicety is that this module will setup environment variables for any ALLCAPS variables you define. So, the above "ORACLE_HOME" variable will automatically be stuck into %ENV. But you would still access it in your program as "oracle_home". This may seem confusing at first, but once you use it, I think you'll find it makes sense.

Finally, if called in a scalar context, then variables will be imported directly into the "main::" namespace, just like if you had defined them yourself:

    use Config::Fast;

    fastconfig('web.conf');

    print "The web address is: $website\n";     # website from conf

Generally, this is regarded as dangerous and bad form, so I would strongly advise using this form only in throwaway scripts, or not at all.

VARIABLES

    use Config::Fast;
    $Config::Fast::Variable = 'value';
    %cf = fastconfig;

The recognized variables are:

$Delim

The config file delimiter to use. This can also be specified as the second argument to "fastconfig()". This defaults to "\s+".

$KeepCase

If set to 1, then "MixedCaseVariables" are maintained intact. By default, all variables are converted to lowercase.

$EnvCaps

If set to 1 (the default), then any "ALLCAPS" variables are set as environment variables. They are still returned in lowercase from "fastconfig()".

$Arrays

If set to 1, then settings that look like shell arrays are converted into a Perl array. For example, this config block:

    MATRIX[0]="a b c"
    MATRIX[1]="d e f"
    MATRIX[2]="g h i"
    

Would be returned as:

    $conf{matrix} = [ 'a b c', 'd e f', 'g h i' ];
    

Instead of the default:

    $conf{matrix[0]} = 'a b c';
    $conf{matrix[1]} = 'd e f';
    $conf{matrix[2]} = 'g h i';
    

@Define

This allows you to pre-define var=val pairs that are set before the parsing of the config file. I introduced this feature to solve a specific problem: Executable relocation. In my config files, I put definitions such as:

    # Parsed by Config::Fast and sourced by shell scripts
    BIN="$ROOT/bin"
    SBIN="$ROOT/sbin"
    LIB="$ROOT/lib"
    ETC="$ROOT/etc"
    

With the goal that this file would be equally usable by both Perl and shell scripts.

When parsed by "Config::Fast", I pre-define "ROOT" to "pwd" before calling "fastconfig()":

    use Cwd;
    my $pwd = cwd;
    @Config::Fast::Define = ([ROOT => $pwd]);
    my %conf = fastconfig("$pwd/conf/core.conf");
    

Each element of

%Convert

This is a hash of regex patterns specifying values that should be converted before being returned. By default, values that look like "true|on|yes" will be converted to 1, and values that match "false|off|no" will be converted to 0. You could set your own conversions with:

    $Config::Fast::CONVERT{'fluffy|chewy'} = 'taffy';
    

This would convert any settings of "fluffy" or "chewy" to "taffy".

NOTES

For a much more full-featured config module, check out "Config::ApacheFormat". It can handle Apache style blocks, array values, etc, etc. This one is supposed to be fast and easy.

VERSION

AUTHOR

This module is free software; you may copy this under the terms of the GNU General Public License, or the Artistic License, copies of which should have accompanied your Perl kit.