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.\"
.IX Title "System::Sub::AutoLoad 3pm"
.TH System::Sub::AutoLoad 3pm "2021-01-07" "perl v5.32.0" "User Contributed Perl Documentation"
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.SH "NAME"
System::Sub::AutoLoad \- Auto\-wrap external commands as DWIM subs
.SH "VERSION"
.IX Header "VERSION"
version 0.162800
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.SS "Basic usage"
.IX Subsection "Basic usage"
Any unknown sub will become a \f(CW\*(C`System::Sub\*(C'\fR.
.PP
.Vb 1
\&    use System::Sub::AutoLoad;
\&
\&    my $hostname = hostname();
.Ve
.SS "Usage with forward declaration"
.IX Subsection "Usage with forward declaration"
Allows to avoid using parentheses. \f(CW\*(C`System::Sub\*(C'\fR import stays lazy.
.PP
.Vb 1
\&    use System::Sub::AutoLoad qw(hostname);
\&
\&    my $hostname = hostname;
.Ve
.SS "Usage with forward declaration command options"
.IX Subsection "Usage with forward declaration command options"
Options definitions will be checked lazily at the first call to the \s-1AUTOLOAD\s0
for that sub.
.PP
.Vb 1
\&    use System::Sub::AutoLoad hostname => [ 0 => \*(Aq/bin/hostname\*(Aq ];
\&
\&    my $hostname = hostname;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Any unknown sub in your code will be transformed into a \f(CW\*(C`System::Sub\*(C'\fR at its
first call. This is lazy <http://en.wikipedia.org/wiki/Lazy_evaluation> import
for \f(CW\*(C`System::Sub\*(C'\fR.
.PP
To avoid using parentheses after the sub name, you usually have to predeclare
the sub with either a forward declaration (a sub without body such as
\&\f(CW\*(C`sub foo;\*(C'\fR) or with the \f(CW\*(C`subs\*(C'\fR module. With \f(CW\*(C`Sytem::Sub::AutoLoad\*(C'\fR
you can simply list the subs names on the \f(CW\*(C`use\*(C'\fR line and that will be done
for you.
.PP
You can also pass \f(CW\*(C`System::Sub\*(C'\fR options to the sub, but they will be lazily
analysed: this is the full \f(CW\*(C`System::Sub\*(C'\fR power, but with lazy import.
.SS "Implementation details"
.IX Subsection "Implementation details"
This module exports an \s-1AUTOLOAD\s0 sub that will import
the sub with \f(CW\*(C`System::Sub\*(C'\fR at its first call.
.SH "AUTHOR"
.IX Header "AUTHOR"
Olivier Mengué, \f(CW\*(C`dolmen@cpan.org\*(C'\fR.
.SH "COPYRIGHT & LICENSE"
.IX Header "COPYRIGHT & LICENSE"
Copyright © 2012 Olivier Mengué.
.PP
This library is free software; you can redistribute it and/or modify it under
the same terms as Perl 5 itself.