| Name : perl-IO-Interactive
| |
| Version : 1.022
| Vendor : openSUSE
|
| Release : bp153.1.14
| Date : 2021-03-06 03:37:45
|
| Group : Development/Libraries/Perl
| Source RPM : perl-IO-Interactive-1.022-bp153.1.14.src.rpm
|
| Size : 0.02 MB
| |
| Packager : https://bugs_opensuse_org
| |
| Summary : Utilities for interactive I/O
|
Description :
This module provides three utility subroutines that make it easier to
develop interactive applications...
* \'is_interactive()\'
This subroutine returns true if \'*ARGV\' and the currently selected
filehandle (usually \'*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 the
currently selected). 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
writing 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.
|
RPM found in directory: /packages/linux-pbone/ftp5.gwdg.de/pub/opensuse/repositories/openSUSE:/Backports:/SLE-15-SP3/standard/noarch |
