Beefy Boxes and Bandwidth Generously Provided by pair Networks
Do you know where your variables are?
 
PerlMonks  

RE: RE: Filehandle Filter

by btrott (Parson)
on Aug 11, 2000 at 05:06 UTC ( #27430=note: print w/ replies, xml ) Need Help??


in reply to RE: Filehandle Filter
in thread Filehandle Filter

Ooh. Thanks so much for that trick. Very nice.

How's this for the output functionality?

package Filter::Handle; use strict; use vars qw/@ISA/; use Tie::Handle; @ISA = qw/Tie::Handle/; sub TIEHANDLE { my $class = shift; bless { @_ }, $class; } sub new { my $class = shift; my $fh = shift; tie *{$fh}, __PACKAGE__, fh => $fh, @_; bless { fh => $fh }, $class; } sub DESTROY { my $self = shift; my $fh = $self->{fh}; { local $^W = 0; untie *{$fh} } } sub PRINT { my $self = shift; my $fh = *{ $self->{fh} }; die "No output handler installed" unless defined $self->{output}; print $fh $self->{output}->(@_); } sub CLOSE { }
Now to be used like this:
my $f = Filter::Handle->new(\*STDOUT, output => sub { my($file, $line) = (caller(1))[1,2]; return sprintf "%s:%d - %s\n", $file, $line, join ' ', @_; } ); print "Foo";
I think this might be nice to put on CPAN. I've just sent in my registration for a user ID. So... thanks very much for that idea!


Comment on RE: RE: Filehandle Filter
Select or Download Code
Replies are listed 'Best First'.
chromatic Fixes Filehandle Filter (part 2)
by chromatic (Archbishop) on Aug 11, 2000 at 06:45 UTC
    Okay, I got rid of the hash and used blessed typeglobs, just because I'm that kinda guy and I want the approval of heroes like chip and merlyn and Damian.
    package Filter::Handle; use strict; use vars qw/@ISA/; use Tie::Handle; @ISA = qw/Tie::Handle/; sub TIEHANDLE { my $class = shift; my $fh = shift; bless $fh, $class; } sub new { my $class = shift; my $fh = shift; my $sub = shift; *fh = $sub; tie *{$fh}, __PACKAGE__, $fh; bless $fh, $class; } sub DESTROY { my $self = shift; my $fh = *{ $self }; { local $^W = 0; untie *{$fh} } } sub PRINT { my $self = shift; my $fh = *$self; my $code = *fh{CODE}; die "No output handler installed" unless defined $code; print $fh $code->(@_); } sub CLOSE { }
    You can pass an anonymous sub or a sub ref to the constructor:
    #!/usr/bin/perl -w use strict; use Filter::Handle; local *OUTPUT; open(OUTPUT, ">handle.txt") || die "Can't open: $!"; my $fh = \*OUTPUT; my $f = Filter::Handle->new($fh, sub { my($file, $line) = (caller(1))[1,2]; return sprintf "%s:%d - %s\n", $file, $line, @_; }); print OUTPUT "Foo"; print OUTPUT "Bar";
    Yeah, that's pretty evil. But hey, why not?

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://27430]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others having an uproarious good time at the Monastery: (17)
As of 2015-07-28 13:53 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (255 votes), past polls