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.\" ========================================================================
.\"
.IX Title "IO::Interactive 3pm"
.TH IO::Interactive 3pm "2009-11-13" "perl v5.10.1" "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"
IO::Interactive \- Utilities for interactive I/O
.SH "VERSION"
.IX Header "VERSION"
This document describes IO::Interactive version 0.0.6
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use IO::Interactive qw(is_interactive interactive busy);
\&
\&    if ( is_interactive() ) {
\&        print "Running interactively\en";
\&    }
\&
\&    # or...
\&
\&    print {interactive} "Running interactively\en";
\&
\&
\&    $fh = busy {
\&        do_noninteractive_stuff();
\&    }
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module provides three utility subroutines that make it easier to
develop interactive applications...
.ie n .IP """is_interactive()""" 4
.el .IP "\f(CWis_interactive()\fR" 4
.IX Item "is_interactive()"
This subroutine returns true if \f(CW*ARGV\fR and the currently selected
filehandle (usually \f(CW*STDOUT\fR) are connected to the terminal. The 
test is considerably more sophisticated than:
.Sp
.Vb 1
\&    \-t *ARGV && \-t *STDOUT
.Ve
.Sp
as it takes into account the magic behaviour of \f(CW*ARGV\fR.
.Sp
You can also pass \f(CW\*(C`is_interactive\*(C'\fR a writable filehandle, in which case it
requires that filehandle be connected to a terminal (instead of the
currently selected).  The usual suspect here is \f(CW*STDERR\fR:
.Sp
.Vb 3
\&    if ( is_interactive(*STDERR) ) {
\&        carp $warning;
\&    }
.Ve
.ie n .IP """interactive()""" 4
.el .IP "\f(CWinteractive()\fR" 4
.IX Item "interactive()"
This subroutine returns \f(CW*STDOUT\fR if \f(CW\*(C`is_interactive\*(C'\fR is true. If
\&\f(CW\*(C`is_interactive()\*(C'\fR is false, \f(CW\*(C`interactive\*(C'\fR returns a filehandle that
does not print.
.Sp
This makes it easy to create applications that print out only when the
application is interactive:
.Sp
.Vb 2
\&    print {interactive} "Please enter a value: ";
\&    my $value = <>;
.Ve
.Sp
You can also pass \f(CW\*(C`interactive\*(C'\fR a writable filehandle, in which case it
writes to that filehandle if it is connected to a terminal (instead of 
writinbg to \f(CW*STDOUT\fR). Once again, the usual suspect is \f(CW*STDERR\fR:
.Sp
.Vb 1
\&    print {interactive(*STDERR)} $warning;
.Ve
.ie n .IP """busy {...}""" 4
.el .IP "\f(CWbusy {...}\fR" 4
.IX Item "busy {...}"
This subroutine takes a block as its single argument and executes that block.
Whilst the block is executed, \f(CW*ARGV\fR is temporarily replaced by a closed
filehandle. That is, no input from \f(CW*ARGV\fR is possible in a \f(CW\*(C`busy\*(C'\fR block.
Furthermore, any attempts to send input into the \f(CW\*(C`busy\*(C'\fR block through
\&\f(CW*ARGV\fR is intercepted and a warning message is printed to \f(CW*STDERR\fR.
The \f(CW\*(C`busy\*(C'\fR call returns a filehandle that contains the intercepted input.
.Sp
A \f(CW\*(C`busy\*(C'\fR block is therefore useful to prevent attempts at input when the
program is busy at some non-interactive task.
.SH "DIAGNOSTICS"
.IX Header "DIAGNOSTICS"
.IP "Unknown subroutine (%s) requested" 4
.IX Item "Unknown subroutine (%s) requested"
This module only exports the three subroutines described above.
You asked for something else. Maybe you misspelled the subroutine you wanted.
.SH "CONFIGURATION AND ENVIRONMENT"
.IX Header "CONFIGURATION AND ENVIRONMENT"
IO::Interactive requires no configuration files or environment variables.
.SH "DEPENDENCIES"
.IX Header "DEPENDENCIES"
This module requires the \f(CW\*(C`openhandle()\*(C'\fR subroutine from the
Scalar::Util module.
.SH "INCOMPATIBILITIES"
.IX Header "INCOMPATIBILITIES"
None reported.
.SH "BUGS AND LIMITATIONS"
.IX Header "BUGS AND LIMITATIONS"
No bugs have been reported.
.PP
Please report any bugs or feature requests to
\&\f(CW\*(C`bug\-io\-interactive@rt.cpan.org\*(C'\fR, or through the web interface at
<http://rt.cpan.org>.
.SH "AUTHOR"
.IX Header "AUTHOR"
Damian Conway  \f(CW\*(C`<DCONWAY@cpan.org>\*(C'\fR
.PP
Currently maintained by brian d foy \f(CW\*(C`<bdfoy@cpan.org>\*(C'\fR
.SH "LICENCE AND COPYRIGHT"
.IX Header "LICENCE AND COPYRIGHT"
Copyright (c) 2005, Damian Conway \f(CW\*(C`<DCONWAY@cpan.org>\*(C'\fR. All rights reserved.
.PP
This module is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
.SH "DISCLAIMER OF WARRANTY"
.IX Header "DISCLAIMER OF WARRANTY"
\&\s-1BECAUSE\s0 \s-1THIS\s0 \s-1SOFTWARE\s0 \s-1IS\s0 \s-1LICENSED\s0 \s-1FREE\s0 \s-1OF\s0 \s-1CHARGE\s0, \s-1THERE\s0 \s-1IS\s0 \s-1NO\s0 \s-1WARRANTY\s0
\&\s-1FOR\s0 \s-1THE\s0 \s-1SOFTWARE\s0, \s-1TO\s0 \s-1THE\s0 \s-1EXTENT\s0 \s-1PERMITTED\s0 \s-1BY\s0 \s-1APPLICABLE\s0 \s-1LAW\s0. \s-1EXCEPT\s0 \s-1WHEN\s0
\&\s-1OTHERWISE\s0 \s-1STATED\s0 \s-1IN\s0 \s-1WRITING\s0 \s-1THE\s0 \s-1COPYRIGHT\s0 \s-1HOLDERS\s0 \s-1AND/OR\s0 \s-1OTHER\s0 \s-1PARTIES\s0
\&\s-1PROVIDE\s0 \s-1THE\s0 \s-1SOFTWARE\s0 \*(L"\s-1AS\s0 \s-1IS\s0\*(R" \s-1WITHOUT\s0 \s-1WARRANTY\s0 \s-1OF\s0 \s-1ANY\s0 \s-1KIND\s0, \s-1EITHER\s0
\&\s-1EXPRESSED\s0 \s-1OR\s0 \s-1IMPLIED\s0, \s-1INCLUDING\s0, \s-1BUT\s0 \s-1NOT\s0 \s-1LIMITED\s0 \s-1TO\s0, \s-1THE\s0 \s-1IMPLIED\s0
\&\s-1WARRANTIES\s0 \s-1OF\s0 \s-1MERCHANTABILITY\s0 \s-1AND\s0 \s-1FITNESS\s0 \s-1FOR\s0 A \s-1PARTICULAR\s0 \s-1PURPOSE\s0. \s-1THE\s0
\&\s-1ENTIRE\s0 \s-1RISK\s0 \s-1AS\s0 \s-1TO\s0 \s-1THE\s0 \s-1QUALITY\s0 \s-1AND\s0 \s-1PERFORMANCE\s0 \s-1OF\s0 \s-1THE\s0 \s-1SOFTWARE\s0 \s-1IS\s0 \s-1WITH\s0
\&\s-1YOU\s0. \s-1SHOULD\s0 \s-1THE\s0 \s-1SOFTWARE\s0 \s-1PROVE\s0 \s-1DEFECTIVE\s0, \s-1YOU\s0 \s-1ASSUME\s0 \s-1THE\s0 \s-1COST\s0 \s-1OF\s0 \s-1ALL\s0
\&\s-1NECESSARY\s0 \s-1SERVICING\s0, \s-1REPAIR\s0, \s-1OR\s0 \s-1CORRECTION\s0.
.PP
\&\s-1IN\s0 \s-1NO\s0 \s-1EVENT\s0 \s-1UNLESS\s0 \s-1REQUIRED\s0 \s-1BY\s0 \s-1APPLICABLE\s0 \s-1LAW\s0 \s-1OR\s0 \s-1AGREED\s0 \s-1TO\s0 \s-1IN\s0 \s-1WRITING\s0
\&\s-1WILL\s0 \s-1ANY\s0 \s-1COPYRIGHT\s0 \s-1HOLDER\s0, \s-1OR\s0 \s-1ANY\s0 \s-1OTHER\s0 \s-1PARTY\s0 \s-1WHO\s0 \s-1MAY\s0 \s-1MODIFY\s0 \s-1AND/OR\s0
\&\s-1REDISTRIBUTE\s0 \s-1THE\s0 \s-1SOFTWARE\s0 \s-1AS\s0 \s-1PERMITTED\s0 \s-1BY\s0 \s-1THE\s0 \s-1ABOVE\s0 \s-1LICENCE\s0, \s-1BE\s0
\&\s-1LIABLE\s0 \s-1TO\s0 \s-1YOU\s0 \s-1FOR\s0 \s-1DAMAGES\s0, \s-1INCLUDING\s0 \s-1ANY\s0 \s-1GENERAL\s0, \s-1SPECIAL\s0, \s-1INCIDENTAL\s0,
\&\s-1OR\s0 \s-1CONSEQUENTIAL\s0 \s-1DAMAGES\s0 \s-1ARISING\s0 \s-1OUT\s0 \s-1OF\s0 \s-1THE\s0 \s-1USE\s0 \s-1OR\s0 \s-1INABILITY\s0 \s-1TO\s0 \s-1USE\s0
\&\s-1THE\s0 \s-1SOFTWARE\s0 (\s-1INCLUDING\s0 \s-1BUT\s0 \s-1NOT\s0 \s-1LIMITED\s0 \s-1TO\s0 \s-1LOSS\s0 \s-1OF\s0 \s-1DATA\s0 \s-1OR\s0 \s-1DATA\s0 \s-1BEING\s0
\&\s-1RENDERED\s0 \s-1INACCURATE\s0 \s-1OR\s0 \s-1LOSSES\s0 \s-1SUSTAINED\s0 \s-1BY\s0 \s-1YOU\s0 \s-1OR\s0 \s-1THIRD\s0 \s-1PARTIES\s0 \s-1OR\s0 A
\&\s-1FAILURE\s0 \s-1OF\s0 \s-1THE\s0 \s-1SOFTWARE\s0 \s-1TO\s0 \s-1OPERATE\s0 \s-1WITH\s0 \s-1ANY\s0 \s-1OTHER\s0 \s-1SOFTWARE\s0), \s-1EVEN\s0 \s-1IF\s0
\&\s-1SUCH\s0 \s-1HOLDER\s0 \s-1OR\s0 \s-1OTHER\s0 \s-1PARTY\s0 \s-1HAS\s0 \s-1BEEN\s0 \s-1ADVISED\s0 \s-1OF\s0 \s-1THE\s0 \s-1POSSIBILITY\s0 \s-1OF\s0
\&\s-1SUCH\s0 \s-1DAMAGES\s0.