Problem with Perl editors.

techcode has asked for the wisdom of the Perl Monks concerning the following question:

I've had this problem before with Open Perl IDE, but thougth that it's his fault. Actually I've never done much of desktop programming with Perl - mostly web stuff so I didn't cared much about it. Now I tried Eclipse & EPIC, and got same thing ...

When I have something like :

print "Test";
my $value = <STDIN>;
[download]

Instead of printing Test and waiting for input as expected - it waits for input, and once you enter something Test is printed. If you have more <STDIN> (like print, STDIN, print, STDIN) you need to enter all of those, and only then something is printed out ..

Anyone knows what's going on?

I also tried that in Komodo 3.1 and it works as expected ... (OT) BTW. Shure Komodo still needs few more things - but other than that it's great ...

Comment on Problem with Perl editors. Download Code

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Re: Problem with Perl editors. by Corion (Patriarch) on Jul 05, 2005 at 15:03 UTC
It's not them, it's you. You are Suffering from Buffering. In short, the following code near the top of your script will likely solve your problem: `use strict; $\|++;` [download]	[reply] [d/l]
Re^2: Problem with Perl editors. by radiantmatrix (Parson) on Jul 05, 2005 at 16:13 UTC
I would suggest `$\|=1;` instead, just because it's a good habit. I've seen moronic situations where $\| gets set to -1 (by a previous mistake by another coder) and thus the `$\|++` I put in place didn't exactly have the desired effect. ;-) Much better, IMO, to explicitly say what you mean. Larry Wall is Yoda: there is no `try{}` The Code that can be seen is not the true Code	[reply] [d/l] [select]
Re^3: Problem with Perl editors. by Corion (Patriarch) on Jul 05, 2005 at 16:16 UTC
Are you sure? `perl -e "$\| = -1; print $\|"` [download] `$\|` is magical in that it can only have the values 1 and 0. `$\|++` switches unbuffering on, while `$\|--` toggles from on to off and back to on.	[reply] [d/l] [select]
Re^4: Problem with Perl editors. by radiantmatrix (Parson) on Jul 05, 2005 at 16:40 UTC
Re^4: Problem with Perl editors. by GrandFather (Saint) on Jul 05, 2005 at 20:40 UTC
Re^3: Problem with Perl editors. by blazar (Canon) on Jul 06, 2005 at 08:35 UTC
I've seen moronic situations where `$\|` gets set to -1 Huh?!? I would be curious to know how to do so, since AFAIK it is not actually possible: `$ perl -le 'print $\|=-1' 1` [download]	[reply] [d/l] [select]
Re^4: Problem with Perl editors. by radiantmatrix (Parson) on Jul 07, 2005 at 18:54 UTC
Re^2: Problem with Perl editors. by techcode (Hermit) on Jul 05, 2005 at 15:29 UTC
Right buffering ... havent tougth of that :) Then it's strange why it's working in Komodo as espected ...	[reply]