perl - call function while reading STDIN -

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i use term::readline::gnu, try use event_loop, or event_hook, or callback_read_char attribute without success.

with event_loop, try sample in doc

$term->event_loop(sub {     $data = shift;     $data->[1] = ae::cv();     $data->[1]->recv();     }, sub {         $fh = shift;         $data = [];         $data->[0] = ae::io($fh, 0, sub { $data->[1]->send() });         $data;     });

and have:

cannot `event_loop' in term::readline::gnu

event_hook works not want...it's called during waiting not when char printed.

i don't found how use callback_read_char attribute , if meets needs...

so, how check input (to print digit) , limit input length 10 digits? how can this? or have use module?

this wanted:

#!/usr/bin/perl -w use strict; use warnings;  use term::screen::readline; use data::dumper;   main();  sub main {      $| =1 ;      $scr = new term::screen::readline;      $scr->clrscr();      $scr->at(1,17)->puts('xxxxxxxxxxxxxxxxxxxxxxxxx');      $scr->at(2,21)->puts('*****************');      $scr->at(4,0)->puts('- xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx');      $scr->at(5,0)->puts('  xxxxxxxxxxxxxxxxxxxxxx: ...................');       $line=$scr->readline(          row         => 5,          col         => 26,          len         => 19,          displaylen  => 19,          line        => '',          onlyvalid   => "[[:digit:]]+",          convert     => undef,          password    => undef,          overwrite   => 1,      );      $scr->at(6,0)->puts(' debug => :' . $line); }

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