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.\" ========================================================================
.\"
.IX Title "Sendpage::KeesConf 3pm"
.TH Sendpage::KeesConf 3pm "2008-01-03" "perl v5.10.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
Sendpage::KeesConf \- implements a configuration file reader
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&    use Sendpage::KeesConf;
\&    $config = Sendpage::KeesConf\->new();
\&
\&    $config\->define("variable", { DEFAULT => "setting" });
\&
\&    $config\->file("config.cfg");
\&
\&    $setting=$config\->get("variable");
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
I have borrowed \s-1VERY\s0 heavily from Andy Wardley's (abw@cre.canon.co.uk)
\&\f(CW\*(C`AppConfig\*(C'\fR tool, which can be found on \s-1CPAN\s0 (http://cpan.perl.org)
but I found it not dynamic enough for multi-instance variable defaults.
As a result, I wrote this massively trimmed-down version for my use.
.PP
The following methods are available:
.ie n .IP "$config = Sendpage::KeesConf\->\fInew()\fR;" 4
.el .IP "\f(CW$config\fR = Sendpage::KeesConf\->\fInew()\fR;" 4
.IX Item "$config = Sendpage::KeesConf->new();"
The constructor doesn't take an arguement, but it should in the future.
.ie n .IP "$config\->\fIforget()\fR;" 4
.el .IP "\f(CW$config\fR\->\fIforget()\fR;" 4
.IX Item "$config->forget();"
This call will make \f(CW$config\fR forget about any variables it has loaded.
It does \s-1NOT\s0 forget \f(CW\*(C`define\*(C'\fRd variables, just instantiated ones via \f(CW\*(C`file\*(C'\fR.
.ie n .IP "$config\->define($name, $options);" 4
.el .IP "\f(CW$config\fR\->define($name, \f(CW$options\fR);" 4
.IX Item "$config->define($name, $options);"
This will define a variable by the name of \f(CW$name\fR.
.Sp
\&\f(CW$options\fR can contain:
.RS 4
.IP "\s-1ARGCOUNT\s0" 4
.IX Item "ARGCOUNT"
What type of variable this should be.  Default value is \*(L"1\*(R".  The available
types are:
.RS 4
.IP "0" 4
Boolean (true/false, yes/no, 1/0)
.IP "1" 4
.IX Item "1"
Scalar (any string)
.IP "2" 4
.IX Item "2"
List (an array of strings)
.RE
.RS 4
.RE
.IP "\s-1DEFAULT\s0" 4
.IX Item "DEFAULT"
The default value the variable should have if it is not overridden during
the call to \f(CW\*(C`file\*(C'\fR.  The \s-1DEFAULT\s0 must be the same data type as \s-1ARGCOUNT\s0.
The default \s-1DEFAULT\s0 is the string \*(L"<unset>\*(R".
.IP "\s-1UNSET\s0" 4
.IX Item "UNSET"
set this to 1 if you want the default value to be undefined.  This is
a hack to get around the default \s-1DEFAULT\s0.
.RE
.RS 4
.RE
.ie n .IP "$config\->instance_exists($name);" 4
.el .IP "\f(CW$config\fR\->instance_exists($name);" 4
.IX Item "$config->instance_exists($name);"
This tests to see if there is a section loaded named \f(CW$name\fR
.ie n .IP "$var=$config\->ifset($name);" 4
.el .IP "\f(CW$var\fR=$config\->ifset($name);" 4
.IX Item "$var=$config->ifset($name);"
This call will search for the variable named \f(CW$name\fR.  If it is not found,
it will return undef.  If the value exists, it will return the value.
This is a way to call \*(L"get\*(R" without having a default passed through.
.ie n .IP "$var=$config\->exists($name);" 4
.el .IP "\f(CW$var\fR=$config\->exists($name);" 4
.IX Item "$var=$config->exists($name);"
This call will search for the variable named \f(CW$name\fR.  If it is not found,
it will return false.  If the value exists, it will return true.  This is
a way for the user to find out if they will get a \*(L"default\*(R" on a call
to \*(L"get\*(R".
.ie n .IP "$var=$config\->fallbackget($name,$quiet);" 4
.el .IP "\f(CW$var\fR=$config\->fallbackget($name,$quiet);" 4
.IX Item "$var=$config->fallbackget($name,$quiet);"
This call will search for the variable named \f(CW$name\fR.  If it is not found,
the section portion will be removed, and retried for a sectionless \*(L"get\*(R" call.
.Sp
That way, global variables can be overridden by section-specific variables.
If \*(L"SECTION:Instance@name\*(R" does not exist, \*(L"name\*(R" will be tried.
.ie n .IP "$var=$config\->get($name);" 4
.el .IP "\f(CW$var\fR=$config\->get($name);" 4
.IX Item "$var=$config->get($name);"
This call will search for the variable named \f(CW$name\fR.  If it is not found,
it will fall back to the default for the section.   Sections are explained
in more detail later.
.ie n .IP "$config\->instances($class);" 4
.el .IP "\f(CW$config\fR\->instances($class);" 4
.IX Item "$config->instances($class);"
Returns an array of the names of all the variables in the class \f(CW$class\fR.
.ie n .IP "$config\->file('program.cfg');" 4
.el .IP "\f(CW$config\fR\->file('program.cfg');" 4
.IX Item "$config->file('program.cfg');"
Loads variables from the named file.  Syntax for this file is:
.Sp
.Vb 6
\&    [SECTION:INSTANCE]
\&    VARIABLE1 = VALUE1
\&    VARIABLE2 = VALUE2
\&    .
\&    .
\&    .
.Ve
.Sp
If \s-1VARIABLE\s0 is an array, \s-1VALUE\s0 is loaded using commas (,) as the
list separator.  The variable will be available under the name of the
section.  For example, to see \s-1VALUE2\s0, it would be accessed as:
.Sp
.Vb 1
\&    $config\->get("SECTION:INSTANCE\e@VARIABLE2");
.Ve
.Sp
Notice, that \*(L"=\*(R", \*(L":\*(R", and \*(L"@\*(R" are all not allowed in section or
variable names.
.PP
Sections can be defined (and loaded) so that defaults can pass back 
to a defined section default.  For example, lets say that you have 
several modems, and most of them have different settings.  You can define
all the modem variables like so:
.PP
.Vb 2
\&        $config\->define("modem:baud",{ DEFAULT => 9600 });
\&        $config\->define("modem:flowctl",{ DEFAULT => "hardware" });
.Ve
.PP
Then, when you load them, let's say the config file has:
.PP
.Vb 2
\&        [modem:sportster]
\&        baud = 115200
\&
\&        [modem:hayes]
.Ve
.PP
The baud rate for the sportster will come back as 115200, but the hayes
will fall back during a \f(CW\*(C`get\*(C'\fR call, and find the default for the modem
section: 9600.  Both fallback to have \*(L"flowctl\*(R" as \*(L"hardware\*(R":
.PP
.Vb 2
\&    # returns specific value 115200
\&    $config\->get("modem:sportster\e@baud");
\&
\&    # returns default value 9600
\&    $config\->get("modem:hayes\e@baud");       
\&
\&    # both return default value "hardware"
\&    $config\->get("modem:sportster\e@flowctl");
\&    $config\->get("modem:hayes\e@flowctl");
.Ve
.SH "CAVEATS"
.IX Header "CAVEATS"
.IP "character limitations" 4
.IX Item "character limitations"
As mentioned above, variable names (and section names) cannot have the
characters \*(L":\*(R", \*(L"@\*(R", or \*(L"=\*(R" in them.
.IP "default defaults" 4
.IX Item "default defaults"
There should be a way to pass default defaults into \f(CW\*(C`new\*(C'\fR.  That would
be handy, and could eliminate the need for the \s-1UNSET\s0 option in \f(CW\*(C`define\*(C'\fR.
.SH "AUTHOR"
.IX Header "AUTHOR"
Kees Cook <kees@outflux.net>
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIperl\fR\|(1), \fIsendpage\fR\|(1), \fISendpage::KeesLog\fR\|(3), \fISendpage::Modem\fR\|(3),
\&\fISendpage::PagingCentral\fR\|(3), \fISendpage::PageQueue\fR\|(3), \fISendpage::Page\fR\|(3),
\&\fISendpage::Recipient\fR\|(3), \fISendpage::Queue\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000 Kees Cook.
.PP
This library is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.