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IO::Interactive 0.0.3

  Date Added: February 14, 2010  |  Visits: 928

IO::Interactive

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IO::Interactive is a Perl module with utilities for interactive I/O. SYNOPSIS use IO::Interactive qw(is_interactive interactive busy); if ( is_interactive() ) { print "Running interactivelyn"; } # or... print {interactive} "Running interactivelyn"; $fh = busy { do_noninteractive_stuff(); } This module provides three utility subroutines that make it easier to develop interactive applications... is_interactive() This subroutine returns true if *ARGV and *STDOUT are connected to the terminal. The test is considerably more sophisticated than: -t *ARGV && -t *STDOUT as it takes into account the magic behaviour of *ARGV. You can also pass is_interactive a writable filehandle, in which case it requires that filehandle be connected to a terminal (instead of *STDOUT). The usual suspect here is *STDERR: if ( is_interactive(*STDERR) ) { carp $warning; } interactive() This subroutine returns *STDOUT if is_interactive is true. If is_interactive() is false, interactive returns a filehandle that does not print. This makes it easy to create applications that print out only when the application is interactive: print {interactive} "Please enter a value: "; my $value = <>; You can also pass interactive a writable filehandle, in which case it writes to that filehandle if it is connected to a terminal (instead of writinbg to *STDOUT). Once again, the usual suspect is *STDERR: print {interactive(*STDERR)} $warning; busy {...} This subroutine takes a block as its single argument and executes that block. Whilst the block is executed, *ARGV is temporarily replaced by a closed filehandle. That is, no input from *ARGV is possible in a busy block. Furthermore, any attempts to send input into the busy block through *ARGV is intercepted and a warning message is printed to *STDERR. The busy call returns a filehandle that contains the intercepted input. A busy block is therefore useful to prevent attempts at input when the program is busy at some non-interactive task..

Requirements: No special requirements
Platforms: Linux
Keyword: Argv Block Busy Filehandle Interactive Io Iointeractive Libraries Module Perl Module Print Programming Stderr Stdout
Users rating: 0/10

License: Freeware Size: 5.12 KB
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